srs/trunk/src/app/srs_app_config.cpp

/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2020 Winlin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <srs_app_config.hpp>

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
// file operations.
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <vector>
#include <algorithm>
using namespace std;

#include <srs_kernel_error.hpp>
#include <srs_kernel_log.hpp>
#include <srs_protocol_utility.hpp>
#include <srs_core_autofree.hpp>
#include <srs_app_source.hpp>
#include <srs_kernel_file.hpp>
#include <srs_app_utility.hpp>
#include <srs_core_performance.hpp>
#include <srs_protocol_amf0.hpp>
#include <srs_app_statistic.hpp>
#include <srs_protocol_json.hpp>
#include <srs_app_http_hooks.hpp>
#include <srs_kernel_utility.hpp>
#include <srs_rtmp_stack.hpp>

using namespace _srs_internal;

// @global the version to identify the core.
const char* _srs_version = "XCORE-" RTMP_SIG_SRS_SERVER;

#define SRS_WIKI_URL_LOG "https://github.com/ossrs/srs/wiki/v1_CN_SrsLog"

// when user config an invalid value, macros to perfer true or false.
#define SRS_CONF_PERFER_FALSE(conf_arg) conf_arg == "on"
#define SRS_CONF_PERFER_TRUE(conf_arg) conf_arg != "off"

// default config file.
#define SRS_CONF_DEFAULT_COFNIG_FILE "conf/srs.conf"

// '\n'
#define SRS_LF (char)SRS_CONSTS_LF

// '\r'
#define SRS_CR (char)SRS_CONSTS_CR

/**
 * dumps the ingest/transcode-engine in @param dir to amf0 object @param engine.
 * @param dir the transcode or ingest config directive.
 * @param engine the amf0 object to dumps to.
 */
srs_error_t srs_config_dumps_engine(SrsConfDirective* dir, SrsJsonObject* engine);

/**
 * whether the ch is common space.
 */
bool is_common_space(char ch)
{
    return (ch == ' ' || ch == '\t' || ch == SRS_CR || ch == SRS_LF);
}

namespace _srs_internal
{
    SrsConfigBuffer::SrsConfigBuffer()
    {
        line = 1;
        
        pos = last = start = NULL;
        end = start;
    }
    
    SrsConfigBuffer::~SrsConfigBuffer()
    {
        srs_freepa(start);
    }

    // LCOV_EXCL_START
    srs_error_t SrsConfigBuffer::fullfill(const char* filename)
    {
        srs_error_t err = srs_success;
        
        SrsFileReader reader;
        
        // open file reader.
        if ((err = reader.open(filename)) != srs_success) {
            return srs_error_wrap(err, "open file=%s", filename);
        }
        
        // read all.
        int filesize = (int)reader.filesize();
        
        // create buffer
        srs_freepa(start);
        pos = last = start = new char[filesize];
        end = start + filesize;
        
        // read total content from file.
        ssize_t nread = 0;
        if ((err = reader.read(start, filesize, &nread)) != srs_success) {
            return srs_error_wrap(err, "read %d only %d bytes", filesize, nread);
        }
        
        return err;
    }
    // LCOV_EXCL_STOP
    
    bool SrsConfigBuffer::empty()
    {
        return pos >= end;
    }
};

bool srs_directive_equals_self(SrsConfDirective* a, SrsConfDirective* b)
{
    // both NULL, equal.
    if (!a && !b) {
        return true;
    }
    
    if (!a || !b) {
        return false;
    }
    
    if (a->name != b->name) {
        return false;
    }
    
    if (a->args.size() != b->args.size()) {
        return false;
    }
    
    for (int i = 0; i < (int)a->args.size(); i++) {
        if (a->args.at(i) != b->args.at(i)) {
            return false;
        }
    }
    
    if (a->directives.size() != b->directives.size()) {
        return false;
    }
    
    return true;
}

bool srs_directive_equals(SrsConfDirective* a, SrsConfDirective* b)
{
    // both NULL, equal.
    if (!a && !b) {
        return true;
    }
    
    if (!srs_directive_equals_self(a, b)) {
        return false;
    }
    
    for (int i = 0; i < (int)a->directives.size(); i++) {
        SrsConfDirective* a0 = a->at(i);
        SrsConfDirective* b0 = b->at(i);
        
        if (!srs_directive_equals(a0, b0)) {
            return false;
        }
    }
    
    return true;
}

bool srs_directive_equals(SrsConfDirective* a, SrsConfDirective* b, string except)
{
    // both NULL, equal.
    if (!a && !b) {
        return true;
    }
    
    if (!srs_directive_equals_self(a, b)) {
        return false;
    }
    
    for (int i = 0; i < (int)a->directives.size(); i++) {
        SrsConfDirective* a0 = a->at(i);
        SrsConfDirective* b0 = b->at(i);
        
        // donot compare the except child directive.
        if (a0->name == except) {
            continue;
        }
        
        if (!srs_directive_equals(a0, b0, except)) {
            return false;
        }
    }
    
    return true;
}

void set_config_directive(SrsConfDirective* parent, string dir, string value)
{
    SrsConfDirective* d = parent->get_or_create(dir);
    d->name = dir;
    d->args.clear();
    d->args.push_back(value);
}

bool srs_config_hls_is_on_error_ignore(string strategy)
{
    return strategy == "ignore";
}

bool srs_config_hls_is_on_error_continue(string strategy)
{
    return strategy == "continue";
}

bool srs_config_ingest_is_file(string type)
{
    return type == "file";
}

bool srs_config_ingest_is_stream(string type)
{
    return type == "stream";
}

bool srs_config_dvr_is_plan_segment(string plan)
{
    return plan == "segment";
}

bool srs_config_dvr_is_plan_session(string plan)
{
    return plan == "session";
}

bool srs_stream_caster_is_udp(string caster)
{
    return caster == "mpegts_over_udp";
}

bool srs_stream_caster_is_rtsp(string caster)
{
    return caster == "rtsp";
}

bool srs_stream_caster_is_flv(string caster)
{
    return caster == "flv";
}

bool srs_config_apply_filter(SrsConfDirective* dvr_apply, SrsRequest* req)
{
    static bool DEFAULT = true;
    
    if (!dvr_apply || dvr_apply->args.empty()) {
        return DEFAULT;
    }
    
    vector<string>& args = dvr_apply->args;
    if (args.size() == 1 && dvr_apply->arg0() == "all") {
        return true;
    }
    
    string id = req->app + "/" + req->stream;
    if (::find(args.begin(), args.end(), id) != args.end()) {
        return true;
    }
    
    return false;
}

string srs_config_bool2switch(string sbool)
{
    return sbool == "true"? "on":"off";
}

srs_error_t srs_config_transform_vhost(SrsConfDirective* root)
{
    srs_error_t err = srs_success;
    
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* dir = root->directives.at(i);
        
        // SRS2.0, rename global http_stream to http_server.
        //  SRS1:
        //      http_stream {}
        //  SRS2+:
        //      http_server {}
        if (dir->name == "http_stream") {
            dir->name = "http_server";
            continue;
        }
        
        if (!dir->is_vhost()) {
            continue;
        }
        
        // for each directive of vhost.
        std::vector<SrsConfDirective*>::iterator it;
        for (it = dir->directives.begin(); it != dir->directives.end();) {
            SrsConfDirective* conf = *it;
            string n = conf->name;
            
            // SRS2.0, rename vhost http to http_static
            //  SRS1:
            //      vhost { http {} }
            //  SRS2+:
            //      vhost { http_static {} }
            if (n == "http") {
                conf->name = "http_static";
                srs_warn("transform: vhost.http => vhost.http_static for %s", dir->name.c_str());
                ++it;
                continue;
            }
            
            // SRS3.0, ignore hstrs, always on.
            // SRS1/2:
            //      vhost { http_remux { hstrs; } }
            if (n == "http_remux") {
                SrsConfDirective* hstrs = conf->get("hstrs");
                conf->remove(hstrs);
                srs_freep(hstrs);
            }
            
            // SRS3.0, change the refer style
            //  SRS1/2:
            //      vhost { refer; refer_play; refer_publish; }
            //  SRS3+:
            //      vhost { refer { enabled; all; play; publish; } }
            if ((n == "refer" && conf->directives.empty()) || n == "refer_play" || n == "refer_publish") {
                // remove the old one first, for name duplicated.
                it = dir->directives.erase(it);
                
                SrsConfDirective* refer = dir->get_or_create("refer");
                refer->get_or_create("enabled", "on");
                if (n == "refer") {
                    SrsConfDirective* all = refer->get_or_create("all");
                    all->args = conf->args;
                    srs_warn("transform: vhost.refer to vhost.refer.all for %s", dir->name.c_str());
                } else if (n == "refer_play") {
                    SrsConfDirective* play = refer->get_or_create("play");
                    play->args = conf->args;
                    srs_warn("transform: vhost.refer_play to vhost.refer.play for %s", dir->name.c_str());
                } else if (n == "refer_publish") {
                    SrsConfDirective* publish = refer->get_or_create("publish");
                    publish->args = conf->args;
                    srs_warn("transform: vhost.refer_publish to vhost.refer.publish for %s", dir->name.c_str());
                }
                
                // remove the old directive.
                srs_freep(conf);
                continue;
            }
            
            // SRS3.0, change the mr style
            //  SRS2:
            //      vhost { mr { enabled; latency; } }
            //  SRS3+:
            //      vhost { publish { mr; mr_latency; } }
            if (n == "mr") {
                it = dir->directives.erase(it);
                
                SrsConfDirective* publish = dir->get_or_create("publish");
                
                SrsConfDirective* enabled = conf->get("enabled");
                if (enabled) {
                    SrsConfDirective* mr = publish->get_or_create("mr");
                    mr->args = enabled->args;
                    srs_warn("transform: vhost.mr.enabled to vhost.publish.mr for %s", dir->name.c_str());
                }
                
                SrsConfDirective* latency = conf->get("latency");
                if (latency) {
                    SrsConfDirective* mr_latency = publish->get_or_create("mr_latency");
                    mr_latency->args = latency->args;
                    srs_warn("transform: vhost.mr.latency to vhost.publish.mr_latency for %s", dir->name.c_str());
                }
                
                srs_freep(conf);
                continue;
            }
            
            // SRS3.0, change the publish_1stpkt_timeout
            //  SRS2:
            //      vhost { publish_1stpkt_timeout; }
            //  SRS3+:
            //      vhost { publish { firstpkt_timeout; } }
            if (n == "publish_1stpkt_timeout") {
                it = dir->directives.erase(it);
                
                SrsConfDirective* publish = dir->get_or_create("publish");
                
                SrsConfDirective* firstpkt_timeout = publish->get_or_create("firstpkt_timeout");
                firstpkt_timeout->args = conf->args;
                srs_warn("transform: vhost.publish_1stpkt_timeout to vhost.publish.firstpkt_timeout for %s", dir->name.c_str());
                
                srs_freep(conf);
                continue;
            }
            
            // SRS3.0, change the publish_normal_timeout
            //  SRS2:
            //      vhost { publish_normal_timeout; }
            //  SRS3+:
            //      vhost { publish { normal_timeout; } }
            if (n == "publish_normal_timeout") {
                it = dir->directives.erase(it);
                
                SrsConfDirective* publish = dir->get_or_create("publish");
                
                SrsConfDirective* normal_timeout = publish->get_or_create("normal_timeout");
                normal_timeout->args = conf->args;
                srs_warn("transform: vhost.publish_normal_timeout to vhost.publish.normal_timeout for %s", dir->name.c_str());
                
                srs_freep(conf);
                continue;
            }
            
            // SRS3.0, change the folowing like a shadow:
            //      time_jitter, mix_correct, atc, atc_auto, mw_latency, gop_cache, queue_length
            //  SRS1/2:
            //      vhost { shadow; }
            //  SRS3+:
            //      vhost { play { shadow; } }
            if (n == "time_jitter" || n == "mix_correct" || n == "atc" || n == "atc_auto"
                || n == "mw_latency" || n == "gop_cache" || n == "queue_length" || n == "send_min_interval"
                || n == "reduce_sequence_header") {
                it = dir->directives.erase(it);
                
                SrsConfDirective* play = dir->get_or_create("play");
                SrsConfDirective* shadow = play->get_or_create(conf->name);
                shadow->args = conf->args;
                srs_warn("transform: vhost.%s to vhost.play.%s of %s", n.c_str(), n.c_str(), dir->name.c_str());
                
                srs_freep(conf);
                continue;
            }
            
            // SRS3.0, change the forward.
            //  SRS1/2:
            //      vhost { forward target; }
            //  SRS3+:
            //      vhost { forward { enabled; destination target; } }
            if (n == "forward" && conf->directives.empty() && !conf->args.empty()) {
                conf->get_or_create("enabled")->set_arg0("on");
                
                SrsConfDirective* destination = conf->get_or_create("destination");
                destination->args = conf->args;
                conf->args.clear();
                srs_warn("transform: vhost.forward to vhost.forward.destination for %s", dir->name.c_str());
                
                ++it;
                continue;
            }
            
            // SRS3.0, change the folowing like a shadow:
            //      mode, origin, token_traverse, vhost, debug_srs_upnode
            //  SRS1/2:
            //      vhost { shadow; }
            //  SRS3+:
            //      vhost { cluster { shadow; } }
            if (n == "mode" || n == "origin" || n == "token_traverse" || n == "vhost" || n == "debug_srs_upnode") {
                it = dir->directives.erase(it);
                
                SrsConfDirective* cluster = dir->get_or_create("cluster");
                SrsConfDirective* shadow = cluster->get_or_create(conf->name);
                shadow->args = conf->args;
                srs_warn("transform: vhost.%s to vhost.cluster.%s of %s", n.c_str(), n.c_str(), dir->name.c_str());
                
                srs_freep(conf);
                continue;
            }
            
            ++it;
        }
    }
    
    return err;
}

// LCOV_EXCL_START
srs_error_t srs_config_dumps_engine(SrsConfDirective* dir, SrsJsonObject* engine)
{
    srs_error_t err = srs_success;
    
    SrsConfDirective* conf = NULL;
    
    engine->set("id", dir->dumps_arg0_to_str());
    engine->set("enabled", SrsJsonAny::boolean(_srs_config->get_engine_enabled(dir)));
    
    if ((conf = dir->get("iformat")) != NULL) {
        engine->set("iformat", conf->dumps_arg0_to_str());
    }
    
    if ((conf = dir->get("vfilter")) != NULL) {
        SrsJsonObject* vfilter = SrsJsonAny::object();
        engine->set("vfilter", vfilter);
        
        for (int i = 0; i < (int)conf->directives.size(); i++) {
            SrsConfDirective* sdir = conf->directives.at(i);
            vfilter->set(sdir->name, sdir->dumps_arg0_to_str());
        }
    }
    
    if ((conf = dir->get("vcodec")) != NULL) {
        engine->set("vcodec", conf->dumps_arg0_to_str());
    }
    
    if ((conf = dir->get("vbitrate")) != NULL) {
        engine->set("vbitrate", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("vfps")) != NULL) {
        engine->set("vfps", conf->dumps_arg0_to_number());
    }
    
    if ((conf = dir->get("vwidth")) != NULL) {
        engine->set("vwidth", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("vheight")) != NULL) {
        engine->set("vheight", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("vthreads")) != NULL) {
        engine->set("vthreads", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("vprofile")) != NULL) {
        engine->set("vprofile", conf->dumps_arg0_to_str());
    }
    
    if ((conf = dir->get("vpreset")) != NULL) {
        engine->set("vpreset", conf->dumps_arg0_to_str());
    }
    
    if ((conf = dir->get("vparams")) != NULL) {
        SrsJsonObject* vparams = SrsJsonAny::object();
        engine->set("vparams", vparams);
        
        for (int i = 0; i < (int)conf->directives.size(); i++) {
            SrsConfDirective* sdir = conf->directives.at(i);
            vparams->set(sdir->name, sdir->dumps_arg0_to_str());
        }
    }
    
    if ((conf = dir->get("acodec")) != NULL) {
        engine->set("acodec", conf->dumps_arg0_to_str());
    }
    
    if ((conf = dir->get("abitrate")) != NULL) {
        engine->set("abitrate", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("asample_rate")) != NULL) {
        engine->set("asample_rate", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("achannels")) != NULL) {
        engine->set("achannels", conf->dumps_arg0_to_integer());
    }
    
    if ((conf = dir->get("aparams")) != NULL) {
        SrsJsonObject* aparams = SrsJsonAny::object();
        engine->set("aparams", aparams);
        
        for (int i = 0; i < (int)conf->directives.size(); i++) {
            SrsConfDirective* sdir = conf->directives.at(i);
            aparams->set(sdir->name, sdir->dumps_arg0_to_str());
        }
    }
    
    if ((conf = dir->get("oformat")) != NULL) {
        engine->set("oformat", conf->dumps_arg0_to_str());
    }
    
    if ((conf = dir->get("output")) != NULL) {
        engine->set("output", conf->dumps_arg0_to_str());
    }
    
    return err;
}
// LCOV_EXCL_STOP

SrsConfDirective::SrsConfDirective()
{
}

SrsConfDirective::~SrsConfDirective()
{
    std::vector<SrsConfDirective*>::iterator it;
    for (it = directives.begin(); it != directives.end(); ++it) {
        SrsConfDirective* directive = *it;
        srs_freep(directive);
    }
    directives.clear();
}

SrsConfDirective* SrsConfDirective::copy()
{
    return copy("");
}

SrsConfDirective* SrsConfDirective::copy(string except)
{
    SrsConfDirective* cp = new SrsConfDirective();
    
    cp->conf_line = conf_line;
    cp->name = name;
    cp->args = args;
    
    for (int i = 0; i < (int)directives.size(); i++) {
        SrsConfDirective* directive = directives.at(i);
        if (!except.empty() && directive->name == except) {
            continue;
        }
        cp->directives.push_back(directive->copy(except));
    }
    
    return cp;
}

string SrsConfDirective::arg0()
{
    if (args.size() > 0) {
        return args.at(0);
    }
    
    return "";
}

string SrsConfDirective::arg1()
{
    if (args.size() > 1) {
        return args.at(1);
    }
    
    return "";
}

string SrsConfDirective::arg2()
{
    if (args.size() > 2) {
        return args.at(2);
    }
    
    return "";
}

string SrsConfDirective::arg3()
{
    if (args.size() > 3) {
        return args.at(3);
    }
    
    return "";
}

SrsConfDirective* SrsConfDirective::at(int index)
{
    srs_assert(index < (int)directives.size());
    return directives.at(index);
}

SrsConfDirective* SrsConfDirective::get(string _name)
{
    std::vector<SrsConfDirective*>::iterator it;
    for (it = directives.begin(); it != directives.end(); ++it) {
        SrsConfDirective* directive = *it;
        if (directive->name == _name) {
            return directive;
        }
    }
    
    return NULL;
}

SrsConfDirective* SrsConfDirective::get(string _name, string _arg0)
{
    std::vector<SrsConfDirective*>::iterator it;
    for (it = directives.begin(); it != directives.end(); ++it) {
        SrsConfDirective* directive = *it;
        if (directive->name == _name && directive->arg0() == _arg0) {
            return directive;
        }
    }
    
    return NULL;
}

SrsConfDirective* SrsConfDirective::get_or_create(string n)
{
    SrsConfDirective* conf = get(n);
    
    if (!conf) {
        conf = new SrsConfDirective();
        conf->name = n;
        directives.push_back(conf);
    }
    
    return conf;
}

SrsConfDirective* SrsConfDirective::get_or_create(string n, string a0)
{
    SrsConfDirective* conf = get(n, a0);
    
    if (!conf) {
        conf = new SrsConfDirective();
        conf->name = n;
        conf->args.push_back(a0);
        directives.push_back(conf);
    }
    
    return conf;
}

SrsConfDirective* SrsConfDirective::get_or_create(string n, string a0, string a1)
{
    SrsConfDirective* conf = get(n, a0);

    if (!conf) {
        conf = new SrsConfDirective();
        conf->name = n;
        conf->args.push_back(a0);
        conf->args.push_back(a1);
        directives.push_back(conf);
    }

    return conf;
}

SrsConfDirective* SrsConfDirective::set_arg0(string a0)
{
    if (arg0() == a0) {
        return this;
    }
    
    // update a0.
    if (!args.empty()) {
        args.erase(args.begin());
    }
    
    args.insert(args.begin(), a0);
    
    return this;
}

void SrsConfDirective::remove(SrsConfDirective* v)
{
    std::vector<SrsConfDirective*>::iterator it;
    if ((it = ::find(directives.begin(), directives.end(), v)) != directives.end()) {
        directives.erase(it);
    }
}

bool SrsConfDirective::is_vhost()
{
    return name == "vhost";
}

bool SrsConfDirective::is_stream_caster()
{
    return name == "stream_caster";
}

srs_error_t SrsConfDirective::parse(SrsConfigBuffer* buffer)
{
    return parse_conf(buffer, parse_file);
}

srs_error_t SrsConfDirective::persistence(SrsFileWriter* writer, int level)
{
    srs_error_t err = srs_success;
    
    static char SPACE = SRS_CONSTS_SP;
    static char SEMICOLON = SRS_CONSTS_SE;
    static char LF = SRS_CONSTS_LF;
    static char LB = SRS_CONSTS_LB;
    static char RB = SRS_CONSTS_RB;
    static const char* INDENT = "    ";
    
    // for level0 directive, only contains sub directives.
    if (level > 0) {
        // indent by (level - 1) * 4 space.
        for (int i = 0; i < level - 1; i++) {
            if ((err = writer->write((char*)INDENT, 4, NULL)) != srs_success) {
                return srs_error_wrap(err, "write indent");
            }
        }
        
        // directive name.
        if ((err = writer->write((char*)name.c_str(), (int)name.length(), NULL)) != srs_success) {
            return srs_error_wrap(err, "write name");
        }
        if (!args.empty() && (err = writer->write((char*)&SPACE, 1, NULL)) != srs_success) {
            return srs_error_wrap(err, "write name space");
        }
        
        // directive args.
        for (int i = 0; i < (int)args.size(); i++) {
            std::string& arg = args.at(i);
            if ((err = writer->write((char*)arg.c_str(), (int)arg.length(), NULL)) != srs_success) {
                return srs_error_wrap(err, "write arg");
            }
            if (i < (int)args.size() - 1 && (err = writer->write((char*)&SPACE, 1, NULL)) != srs_success) {
                return srs_error_wrap(err, "write arg space");
            }
        }
        
        // native directive, without sub directives.
        if (directives.empty()) {
            if ((err = writer->write((char*)&SEMICOLON, 1, NULL)) != srs_success) {
                return srs_error_wrap(err, "write arg semicolon");
            }
        }
    }
    
    // persistence all sub directives.
    if (level > 0) {
        if (!directives.empty()) {
            if ((err = writer->write((char*)&SPACE, 1, NULL)) != srs_success) {
                return srs_error_wrap(err, "write sub-dir space");
            }
            if ((err = writer->write((char*)&LB, 1, NULL)) != srs_success) {
                return srs_error_wrap(err, "write sub-dir left-brace");
            }
        }
        
        if ((err = writer->write((char*)&LF, 1, NULL)) != srs_success) {
            return srs_error_wrap(err, "write sub-dir linefeed");
        }
    }
    
    for (int i = 0; i < (int)directives.size(); i++) {
        SrsConfDirective* dir = directives.at(i);
        if ((err = dir->persistence(writer, level + 1)) != srs_success) {
            return srs_error_wrap(err, "sub-dir %s", dir->name.c_str());
        }
    }
    
    if (level > 0 && !directives.empty()) {
        // indent by (level - 1) * 4 space.
        for (int i = 0; i < level - 1; i++) {
            if ((err = writer->write((char*)INDENT, 4, NULL)) != srs_success) {
                return srs_error_wrap(err, "write sub-dir indent");
            }
        }
        
        if ((err = writer->write((char*)&RB, 1, NULL)) != srs_success) {
            return srs_error_wrap(err, "write sub-dir right-brace");
        }
        
        if ((err = writer->write((char*)&LF, 1, NULL)) != srs_success) {
            return srs_error_wrap(err, "write sub-dir linefeed");
        }
    }
    
    
    return err;
}

// LCOV_EXCL_START
SrsJsonArray* SrsConfDirective::dumps_args()
{
    SrsJsonArray* arr = SrsJsonAny::array();
    for (int i = 0; i < (int)args.size(); i++) {
        string arg = args.at(i);
        arr->append(SrsJsonAny::str(arg.c_str()));
    }
    return arr;
}

SrsJsonAny* SrsConfDirective::dumps_arg0_to_str()
{
    return SrsJsonAny::str(arg0().c_str());
}

SrsJsonAny* SrsConfDirective::dumps_arg0_to_integer()
{
    return SrsJsonAny::integer(::atoll(arg0().c_str()));
}

SrsJsonAny* SrsConfDirective::dumps_arg0_to_number()
{
    return SrsJsonAny::number(::atof(arg0().c_str()));
}

SrsJsonAny* SrsConfDirective::dumps_arg0_to_boolean()
{
    return SrsJsonAny::boolean(arg0() == "on");
}
// LCOV_EXCL_STOP

// see: ngx_conf_parse
srs_error_t SrsConfDirective::parse_conf(SrsConfigBuffer* buffer, SrsDirectiveType type)
{
    srs_error_t err = srs_success;
    
    while (true) {
        std::vector<string> args;
        int line_start = 0;
        err = read_token(buffer, args, line_start);
        
        /**
         * ret maybe:
         * ERROR_SYSTEM_CONFIG_INVALID           error.
         * ERROR_SYSTEM_CONFIG_DIRECTIVE         directive terminated by ';' found
         * ERROR_SYSTEM_CONFIG_BLOCK_START       token terminated by '{' found
         * ERROR_SYSTEM_CONFIG_BLOCK_END         the '}' found
         * ERROR_SYSTEM_CONFIG_EOF               the config file is done
         */
        if (srs_error_code(err) == ERROR_SYSTEM_CONFIG_INVALID) {
            return err;
        }
        if (srs_error_code(err) == ERROR_SYSTEM_CONFIG_BLOCK_END) {
            if (type != parse_block) {
                return srs_error_wrap(err, "line %d: unexpected \"}\"", buffer->line);
            }
            
            srs_freep(err);
            return srs_success;
        }
        if (srs_error_code(err) == ERROR_SYSTEM_CONFIG_EOF) {
            if (type == parse_block) {
                return srs_error_wrap(err, "line %d: unexpected end of file, expecting \"}\"", conf_line);
            }
            
            srs_freep(err);
            return srs_success;
        }
        
        if (args.empty()) {
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "line %d: empty directive", conf_line);
        }
        
        // build directive tree.
        SrsConfDirective* directive = new SrsConfDirective();
        
        directive->conf_line = line_start;
        directive->name = args[0];
        args.erase(args.begin());
        directive->args.swap(args);
        
        directives.push_back(directive);
        
        if (srs_error_code(err) == ERROR_SYSTEM_CONFIG_BLOCK_START) {
            srs_freep(err);
            if ((err = directive->parse_conf(buffer, parse_block)) != srs_success) {
                return srs_error_wrap(err, "parse dir");
            }
        }
        srs_freep(err);
    }
    
    return err;
}

// see: ngx_conf_read_token
srs_error_t SrsConfDirective::read_token(SrsConfigBuffer* buffer, vector<string>& args, int& line_start)
{
    srs_error_t err = srs_success;
    
    char* pstart = buffer->pos;
    
    bool sharp_comment = false;
    
    bool d_quoted = false;
    bool s_quoted = false;
    
    bool need_space = false;
    bool last_space = true;
    
    while (true) {
        if (buffer->empty()) {
            if (!args.empty() || !last_space) {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID,
                    "line %d: unexpected end of file, expecting ; or \"}\"",
                    buffer->line);
            }
            srs_trace("config parse complete");
            
            return srs_error_new(ERROR_SYSTEM_CONFIG_EOF, "EOF");
        }
        
        char ch = *buffer->pos++;
        
        if (ch == SRS_LF) {
            buffer->line++;
            sharp_comment = false;
        }
        
        if (sharp_comment) {
            continue;
        }
        
        if (need_space) {
            if (is_common_space(ch)) {
                last_space = true;
                need_space = false;
                continue;
            }
            if (ch == ';') {
                return srs_error_new(ERROR_SYSTEM_CONFIG_DIRECTIVE, "dir");
            }
            if (ch == '{') {
                return srs_error_new(ERROR_SYSTEM_CONFIG_BLOCK_START, "block");
            }
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "line %d: unexpected '%c'", buffer->line, ch);
        }
        
        // last charecter is space.
        if (last_space) {
            if (is_common_space(ch)) {
                continue;
            }
            pstart = buffer->pos - 1;
            switch (ch) {
                case ';':
                    if (args.size() == 0) {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "line %d: unexpected ';'", buffer->line);
                    }
                    return srs_error_new(ERROR_SYSTEM_CONFIG_DIRECTIVE, "dir");
                case '{':
                    if (args.size() == 0) {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "line %d: unexpected '{'", buffer->line);
                    }
                    return srs_error_new(ERROR_SYSTEM_CONFIG_BLOCK_START, "block");
                case '}':
                    if (args.size() != 0) {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "line %d: unexpected '}'", buffer->line);
                    }
                    return srs_error_new(ERROR_SYSTEM_CONFIG_BLOCK_END, "block");
                case '#':
                    sharp_comment = 1;
                    continue;
                case '"':
                    pstart++;
                    d_quoted = true;
                    last_space = 0;
                    continue;
                case '\'':
                    pstart++;
                    s_quoted = true;
                    last_space = 0;
                    continue;
                default:
                    last_space = 0;
                    continue;
            }
        } else {
            // last charecter is not space
            if (line_start == 0) {
                line_start = buffer->line;
            }
            
            bool found = false;
            if (d_quoted) {
                if (ch == '"') {
                    d_quoted = false;
                    need_space = true;
                    found = true;
                }
            } else if (s_quoted) {
                if (ch == '\'') {
                    s_quoted = false;
                    need_space = true;
                    found = true;
                }
            } else if (is_common_space(ch) || ch == ';' || ch == '{') {
                last_space = true;
                found = 1;
            }
            
            if (found) {
                int len = (int)(buffer->pos - pstart);
                char* aword = new char[len];
                memcpy(aword, pstart, len);
                aword[len - 1] = 0;
                
                string word_str = aword;
                if (!word_str.empty()) {
                    args.push_back(word_str);
                }
                srs_freepa(aword);
                
                if (ch == ';') {
                    return srs_error_new(ERROR_SYSTEM_CONFIG_DIRECTIVE, "dir");
                }
                if (ch == '{') {
                    return srs_error_new(ERROR_SYSTEM_CONFIG_BLOCK_START, "block");
                }
            }
        }
    }
    
    return err;
}

SrsConfig::SrsConfig()
{
    dolphin = false;
    
    show_help = false;
    show_version = false;
    test_conf = false;
    
    root = new SrsConfDirective();
    root->conf_line = 0;
    root->name = "root";
}

SrsConfig::~SrsConfig()
{
    srs_freep(root);
}

bool SrsConfig::is_dolphin()
{
    return dolphin;
}

void SrsConfig::subscribe(ISrsReloadHandler* handler)
{
    std::vector<ISrsReloadHandler*>::iterator it;
    
    it = std::find(subscribes.begin(), subscribes.end(), handler);
    if (it != subscribes.end()) {
        return;
    }
    
    subscribes.push_back(handler);
}

void SrsConfig::unsubscribe(ISrsReloadHandler* handler)
{
    std::vector<ISrsReloadHandler*>::iterator it;
    
    it = std::find(subscribes.begin(), subscribes.end(), handler);
    if (it == subscribes.end()) {
        return;
    }
    
    subscribes.erase(it);
}

// LCOV_EXCL_START
srs_error_t SrsConfig::reload()
{
    srs_error_t err = srs_success;
    
    SrsConfig conf;
    
    if ((err = conf.parse_file(config_file.c_str())) != srs_success) {
        return srs_error_wrap(err, "parse file");
    }
    srs_info("config reloader parse file success.");
    
    // transform config to compatible with previous style of config.
    if ((err = srs_config_transform_vhost(conf.root)) != srs_success) {
        return srs_error_wrap(err, "transform config");
    }
    
    if ((err = conf.check_config()) != srs_success) {
        return srs_error_wrap(err, "check config");
    }
    
    if ((err = reload_conf(&conf)) != srs_success) {
        return srs_error_wrap(err, "reload config");
    }
    
    return err;
}
// LCOV_EXCL_STOP

srs_error_t SrsConfig::reload_vhost(SrsConfDirective* old_root)
{
    srs_error_t err = srs_success;
    
    // merge config.
    std::vector<ISrsReloadHandler*>::iterator it;
    
    // following directly support reload.
    //      origin, token_traverse, vhost, debug_srs_upnode
    
    // state graph
    //      old_vhost       new_vhost
    //      DISABLED    =>  ENABLED
    //      ENABLED     =>  DISABLED
    //      ENABLED     =>  ENABLED (modified)
    
    // collect all vhost names
    std::vector<std::string> vhosts;
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* vhost = root->at(i);
        if (vhost->name != "vhost") {
            continue;
        }
        vhosts.push_back(vhost->arg0());
    }
    for (int i = 0; i < (int)old_root->directives.size(); i++) {
        SrsConfDirective* vhost = old_root->at(i);
        if (vhost->name != "vhost") {
            continue;
        }
        if (root->get("vhost", vhost->arg0())) {
            continue;
        }
        vhosts.push_back(vhost->arg0());
    }
    
    // process each vhost
    for (int i = 0; i < (int)vhosts.size(); i++) {
        std::string vhost = vhosts.at(i);
        
        SrsConfDirective* old_vhost = old_root->get("vhost", vhost);
        SrsConfDirective* new_vhost = root->get("vhost", vhost);
        
        //      DISABLED    =>  ENABLED
        if (!get_vhost_enabled(old_vhost) && get_vhost_enabled(new_vhost)) {
            if ((err = do_reload_vhost_added(vhost)) != srs_success) {
                return srs_error_wrap(err, "reload vhost added");
            }
            continue;
        }
        
        //      ENABLED     =>  DISABLED
        if (get_vhost_enabled(old_vhost) && !get_vhost_enabled(new_vhost)) {
            if ((err = do_reload_vhost_removed(vhost)) != srs_success) {
                return srs_error_wrap(err, "reload vhost removed");
            }
            continue;
        }
        
        // cluster.mode, never supports reload.
        // first, for the origin and edge role change is too complex.
        // second, the vhosts in origin device group normally are all origin,
        //      they never change to edge sometimes.
        // third, the origin or upnode device can always be restart,
        //      edge will retry and the users connected to edge are ok.
        // it's ok to add or remove edge/origin vhost.
        if (get_vhost_is_edge(old_vhost) != get_vhost_is_edge(new_vhost)) {
            return srs_error_new(ERROR_RTMP_EDGE_RELOAD, "vhost mode changed");
        }
        
        // the auto reload configs:
        //      publish.parse_sps
        
        //      ENABLED     =>  ENABLED (modified)
        if (get_vhost_enabled(new_vhost) && get_vhost_enabled(old_vhost)) {
            srs_trace("vhost %s maybe modified, reload its detail.", vhost.c_str());
            // chunk_size, only one per vhost.
            if (!srs_directive_equals(new_vhost->get("chunk_size"), old_vhost->get("chunk_size"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_chunk_size(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes chunk_size failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload chunk_size success.", vhost.c_str());
            }
            
            // tcp_nodelay, only one per vhost
            if (!srs_directive_equals(new_vhost->get("tcp_nodelay"), old_vhost->get("tcp_nodelay"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_tcp_nodelay(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes tcp_nodelay failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload tcp_nodelay success.", vhost.c_str());
            }
            
            // min_latency, only one per vhost
            if (!srs_directive_equals(new_vhost->get("min_latency"), old_vhost->get("min_latency"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_realtime(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes min_latency failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload min_latency success.", vhost.c_str());
            }
            
            // play, only one per vhost
            if (!srs_directive_equals(new_vhost->get("play"), old_vhost->get("play"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_play(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes play failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload play success.", vhost.c_str());
            }
            
            // forward, only one per vhost
            if (!srs_directive_equals(new_vhost->get("forward"), old_vhost->get("forward"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_forward(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes forward failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload forward success.", vhost.c_str());
            }
            
            // To reload DASH.
            if (!srs_directive_equals(new_vhost->get("dash"), old_vhost->get("dash"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_dash(vhost)) != srs_success) {
                        return srs_error_wrap(err, "Reload vhost %s dash failed", vhost.c_str());
                    }
                }
                srs_trace("Reload vhost %s dash ok.", vhost.c_str());
            }
            
            // hls, only one per vhost
            // @remark, the hls_on_error directly support reload.
            if (!srs_directive_equals(new_vhost->get("hls"), old_vhost->get("hls"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_hls(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes hls failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload hls success.", vhost.c_str());
            }
            
            // hds reload
            if (!srs_directive_equals(new_vhost->get("hds"), old_vhost->get("hds"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_hds(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes hds failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload hds success.", vhost.c_str());
            }
            
            // dvr, only one per vhost, except the dvr_apply
            if (!srs_directive_equals(new_vhost->get("dvr"), old_vhost->get("dvr"), "dvr_apply")) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_dvr(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes dvr failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload dvr success.", vhost.c_str());
            }
            // dvr_apply, the dynamic dvr filter.
            if (true) {
                // we must reload the dvr_apply, for it's apply to specified stream,
                // and we donot want one stream reload take effect on another one.
                // @see https://github.com/ossrs/srs/issues/459#issuecomment-140296597
                SrsConfDirective* nda = new_vhost->get("dvr")? new_vhost->get("dvr")->get("dvr_apply") : NULL;
                SrsConfDirective* oda = old_vhost->get("dvr")? old_vhost->get("dvr")->get("dvr_apply") : NULL;
                if (!srs_directive_equals(nda, oda) && (err = do_reload_vhost_dvr_apply(vhost)) != srs_success) {
                    return srs_error_wrap(err, "reload dvr_apply");
                }
            }
            
            // exec, only one per vhost
            if (!srs_directive_equals(new_vhost->get("exec"), old_vhost->get("exec"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_exec(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes exec failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload exec success.", vhost.c_str());
            }
            
            // publish, only one per vhost
            if (!srs_directive_equals(new_vhost->get("publish"), old_vhost->get("publish"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_publish(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes publish failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload publish success.", vhost.c_str());
            }
            
            // http_static, only one per vhost.
            if (!srs_directive_equals(new_vhost->get("http_static"), old_vhost->get("http_static"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_http_updated()) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes http_static failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload http_static success.", vhost.c_str());
            }
            
            // http_remux, only one per vhost.
            if (!srs_directive_equals(new_vhost->get("http_remux"), old_vhost->get("http_remux"))) {
                for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                    ISrsReloadHandler* subscribe = *it;
                    if ((err = subscribe->on_reload_vhost_http_remux_updated(vhost)) != srs_success) {
                        return srs_error_wrap(err, "vhost %s notify subscribes http_remux failed", vhost.c_str());
                    }
                }
                srs_trace("vhost %s reload http_remux success.", vhost.c_str());
            }
            
            // transcode, many per vhost.
            if ((err = reload_transcode(new_vhost, old_vhost)) != srs_success) {
                return srs_error_wrap(err, "reload transcode");
            }
            
            // ingest, many per vhost.
            if ((err = reload_ingest(new_vhost, old_vhost)) != srs_success) {
                return srs_error_wrap(err, "reload ingest");
            }
            continue;
        }
        srs_trace("ignore reload vhost, enabled old: %d, new: %d",
                  get_vhost_enabled(old_vhost), get_vhost_enabled(new_vhost));
    }
    
    return err;
}

srs_error_t SrsConfig::reload_conf(SrsConfig* conf)
{
    srs_error_t err = srs_success;
    
    SrsConfDirective* old_root = root;
    SrsAutoFree(SrsConfDirective, old_root);
    
    root = conf->root;
    conf->root = NULL;
    
    // merge config.
    std::vector<ISrsReloadHandler*>::iterator it;
    
    // never support reload:
    //      daemon
    //
    // always support reload without additional code:
    //      chunk_size, ff_log_dir,
    //      bandcheck, http_hooks, heartbeat,
    //      security
    
    // merge config: listen
    if (!srs_directive_equals(root->get("listen"), old_root->get("listen"))) {
        if ((err = do_reload_listen()) != srs_success) {
            return srs_error_wrap(err, "listen");
        }
    }
    
    // merge config: pid
    if (!srs_directive_equals(root->get("pid"), old_root->get("pid"))) {
        if ((err = do_reload_pid()) != srs_success) {
            return srs_error_wrap(err, "pid");;
        }
    }
    
    // merge config: srs_log_tank
    if (!srs_directive_equals(root->get("srs_log_tank"), old_root->get("srs_log_tank"))) {
        if ((err = do_reload_srs_log_tank()) != srs_success) {
            return srs_error_wrap(err, "log tank");;
        }
    }
    
    // merge config: srs_log_level
    if (!srs_directive_equals(root->get("srs_log_level"), old_root->get("srs_log_level"))) {
        if ((err = do_reload_srs_log_level()) != srs_success) {
            return srs_error_wrap(err, "log level");;
        }
    }
    
    // merge config: srs_log_file
    if (!srs_directive_equals(root->get("srs_log_file"), old_root->get("srs_log_file"))) {
        if ((err = do_reload_srs_log_file()) != srs_success) {
            return srs_error_wrap(err, "log file");;
        }
    }
    
    // merge config: max_connections
    if (!srs_directive_equals(root->get("max_connections"), old_root->get("max_connections"))) {
        if ((err = do_reload_max_connections()) != srs_success) {
            return srs_error_wrap(err, "max connections");;
        }
    }
    
    // merge config: utc_time
    if (!srs_directive_equals(root->get("utc_time"), old_root->get("utc_time"))) {
        if ((err = do_reload_utc_time()) != srs_success) {
            return srs_error_wrap(err, "utc time");;
        }
    }
    
    // merge config: pithy_print_ms
    if (!srs_directive_equals(root->get("pithy_print_ms"), old_root->get("pithy_print_ms"))) {
        if ((err = do_reload_pithy_print_ms()) != srs_success) {
            return srs_error_wrap(err, "pithy print ms");;
        }
    }
    
    // merge config: http_api
    if ((err = reload_http_api(old_root)) != srs_success) {
        return srs_error_wrap(err, "http api");;
    }
    
    // merge config: http_stream
    if ((err = reload_http_stream(old_root)) != srs_success) {
        return srs_error_wrap(err, "http steram");;
    }
    
    // TODO: FIXME: support reload stream_caster.
    
    // merge config: vhost
    if ((err = reload_vhost(old_root)) != srs_success) {
        return srs_error_wrap(err, "vhost");;
    }
    
    return err;
}

srs_error_t SrsConfig::reload_http_api(SrsConfDirective* old_root)
{
    srs_error_t err = srs_success;
    
    // merge config.
    std::vector<ISrsReloadHandler*>::iterator it;
    
    // state graph
    //      old_http_api    new_http_api
    //      DISABLED    =>  ENABLED
    //      ENABLED     =>  DISABLED
    //      ENABLED     =>  ENABLED (modified)
    
    SrsConfDirective* new_http_api = root->get("http_api");
    SrsConfDirective* old_http_api = old_root->get("http_api");
    
    // DISABLED    =>      ENABLED
    if (!get_http_api_enabled(old_http_api) && get_http_api_enabled(new_http_api)) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_http_api_enabled()) != srs_success) {
                return srs_error_wrap(err, "http api off=>on");
            }
        }
        srs_trace("reload off=>on http_api success.");
        return err;
    }
    
    // ENABLED     =>      DISABLED
    if (get_http_api_enabled(old_http_api) && !get_http_api_enabled(new_http_api)) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_http_api_disabled()) != srs_success) {
                return srs_error_wrap(err, "http api on=>off");
            }
        }
        srs_trace("reload http_api on=>off success.");
        return err;
    }
    
    //      ENABLED     =>  ENABLED (modified)
    if (get_http_api_enabled(old_http_api) && get_http_api_enabled(new_http_api)
        && !srs_directive_equals(old_http_api, new_http_api)
        ) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_http_api_enabled()) != srs_success) {
                return srs_error_wrap(err, "http api enabled");
            }
        }
        srs_trace("reload http api enabled success.");
        
        if (!srs_directive_equals(old_http_api->get("crossdomain"), new_http_api->get("crossdomain"))) {
            for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                ISrsReloadHandler* subscribe = *it;
                if ((err = subscribe->on_reload_http_api_crossdomain()) != srs_success) {
                    return srs_error_wrap(err, "http api crossdomain");
                }
            }
        }
        srs_trace("reload http api crossdomain success.");
        
        if (!srs_directive_equals(old_http_api->get("raw_api"), new_http_api->get("raw_api"))) {
            for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                ISrsReloadHandler* subscribe = *it;
                if ((err = subscribe->on_reload_http_api_raw_api()) != srs_success) {
                    return srs_error_wrap(err, "http api raw_api");
                }
            }
        }
        srs_trace("reload http api raw_api success.");
        return err;
    }
    
    srs_trace("reload http_api success, nothing changed.");
    return err;
}

srs_error_t SrsConfig::reload_http_stream(SrsConfDirective* old_root)
{
    srs_error_t err = srs_success;
    
    // merge config.
    std::vector<ISrsReloadHandler*>::iterator it;
    
    // state graph
    //      old_http_stream     new_http_stream
    //      DISABLED    =>      ENABLED
    //      ENABLED     =>      DISABLED
    //      ENABLED     =>      ENABLED (modified)
    
    SrsConfDirective* new_http_stream = root->get("http_server");
    SrsConfDirective* old_http_stream = old_root->get("http_server");
    
    // DISABLED    =>      ENABLED
    if (!get_http_stream_enabled(old_http_stream) && get_http_stream_enabled(new_http_stream)) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_http_stream_enabled()) != srs_success) {
                return srs_error_wrap(err, "http stream off=>on");
            }
        }
        srs_trace("reload http stream off=>on success.");
        return err;
    }
    
    // ENABLED     =>      DISABLED
    if (get_http_stream_enabled(old_http_stream) && !get_http_stream_enabled(new_http_stream)) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_http_stream_disabled()) != srs_success) {
                return srs_error_wrap(err, "http stream on=>off");
            }
        }
        srs_trace("reload http stream on=>off success.");
        return err;
    }
    
    //      ENABLED     =>  ENABLED (modified)
    if (get_http_stream_enabled(old_http_stream) && get_http_stream_enabled(new_http_stream)
        && !srs_directive_equals(old_http_stream, new_http_stream)
        ) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_http_stream_updated()) != srs_success) {
                return srs_error_wrap(err, "http stream enabled");
            }
        }
        srs_trace("reload http stream enabled success.");
        
        if (!srs_directive_equals(old_http_stream->get("crossdomain"), new_http_stream->get("crossdomain"))) {
            for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                ISrsReloadHandler* subscribe = *it;
                if ((err = subscribe->on_reload_http_stream_crossdomain()) != srs_success) {
                    return srs_error_wrap(err, "http stream crossdomain");
                }
            }
        }
        srs_trace("reload http stream crossdomain success.");
        return err;
    }
    
    srs_trace("reload http stream success, nothing changed.");
    return err;
}

srs_error_t SrsConfig::reload_transcode(SrsConfDirective* new_vhost, SrsConfDirective* old_vhost)
{
    srs_error_t err = srs_success;
    
    std::vector<SrsConfDirective*> old_transcoders;
    for (int i = 0; i < (int)old_vhost->directives.size(); i++) {
        SrsConfDirective* conf = old_vhost->at(i);
        if (conf->name == "transcode") {
            old_transcoders.push_back(conf);
        }
    }
    
    std::vector<SrsConfDirective*> new_transcoders;
    for (int i = 0; i < (int)new_vhost->directives.size(); i++) {
        SrsConfDirective* conf = new_vhost->at(i);
        if (conf->name == "transcode") {
            new_transcoders.push_back(conf);
        }
    }
    
    std::vector<ISrsReloadHandler*>::iterator it;
    
    std::string vhost = new_vhost->arg0();
    
    // to be simple:
    // whatever, once tiny changed of transcode,
    // restart all ffmpeg of vhost.
    bool changed = false;
    
    // discovery the removed ffmpeg.
    for (int i = 0; !changed && i < (int)old_transcoders.size(); i++) {
        SrsConfDirective* old_transcoder = old_transcoders.at(i);
        std::string transcoder_id = old_transcoder->arg0();
        
        // if transcoder exists in new vhost, not removed, ignore.
        if (new_vhost->get("transcode", transcoder_id)) {
            continue;
        }
        
        changed = true;
    }
    
    // discovery the added ffmpeg.
    for (int i = 0; !changed && i < (int)new_transcoders.size(); i++) {
        SrsConfDirective* new_transcoder = new_transcoders.at(i);
        std::string transcoder_id = new_transcoder->arg0();
        
        // if transcoder exists in old vhost, not added, ignore.
        if (old_vhost->get("transcode", transcoder_id)) {
            continue;
        }
        
        changed = true;
    }
    
    // for updated transcoders, restart them.
    for (int i = 0; !changed && i < (int)new_transcoders.size(); i++) {
        SrsConfDirective* new_transcoder = new_transcoders.at(i);
        std::string transcoder_id = new_transcoder->arg0();
        SrsConfDirective* old_transcoder = old_vhost->get("transcode", transcoder_id);
        srs_assert(old_transcoder);
        
        if (srs_directive_equals(new_transcoder, old_transcoder)) {
            continue;
        }
        
        changed = true;
    }
    
    // transcode, many per vhost
    if (changed) {
        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
            ISrsReloadHandler* subscribe = *it;
            if ((err = subscribe->on_reload_vhost_transcode(vhost)) != srs_success) {
                return srs_error_wrap(err, "vhost %s notify subscribes transcode failed", vhost.c_str());
            }
        }
        srs_trace("vhost %s reload transcode success.", vhost.c_str());
    }
    
    return err;
}

srs_error_t SrsConfig::reload_ingest(SrsConfDirective* new_vhost, SrsConfDirective* old_vhost)
{
    srs_error_t err = srs_success;
    
    std::vector<SrsConfDirective*> old_ingesters;
    for (int i = 0; i < (int)old_vhost->directives.size(); i++) {
        SrsConfDirective* conf = old_vhost->at(i);
        if (conf->name == "ingest") {
            old_ingesters.push_back(conf);
        }
    }
    
    std::vector<SrsConfDirective*> new_ingesters;
    for (int i = 0; i < (int)new_vhost->directives.size(); i++) {
        SrsConfDirective* conf = new_vhost->at(i);
        if (conf->name == "ingest") {
            new_ingesters.push_back(conf);
        }
    }
    
    std::vector<ISrsReloadHandler*>::iterator it;
    
    std::string vhost = new_vhost->arg0();
    
    // for removed ingesters, stop them.
    for (int i = 0; i < (int)old_ingesters.size(); i++) {
        SrsConfDirective* old_ingester = old_ingesters.at(i);
        std::string ingest_id = old_ingester->arg0();
        SrsConfDirective* new_ingester = new_vhost->get("ingest", ingest_id);
        
        // ENABLED => DISABLED
        if (get_ingest_enabled(old_ingester) && !get_ingest_enabled(new_ingester)) {
            // notice handler ingester removed.
            for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                ISrsReloadHandler* subscribe = *it;
                if ((err = subscribe->on_reload_ingest_removed(vhost, ingest_id)) != srs_success) {
                    return srs_error_wrap(err, "vhost %s notify subscribes ingest=%s removed failed", vhost.c_str(), ingest_id.c_str());
                }
            }
            srs_trace("vhost %s reload ingest=%s removed success.", vhost.c_str(), ingest_id.c_str());
        }
    }
    
    // for added ingesters, start them.
    for (int i = 0; i < (int)new_ingesters.size(); i++) {
        SrsConfDirective* new_ingester = new_ingesters.at(i);
        std::string ingest_id = new_ingester->arg0();
        SrsConfDirective* old_ingester = old_vhost->get("ingest", ingest_id);
        
        // DISABLED => ENABLED
        if (!get_ingest_enabled(old_ingester) && get_ingest_enabled(new_ingester)) {
            for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                ISrsReloadHandler* subscribe = *it;
                if ((err = subscribe->on_reload_ingest_added(vhost, ingest_id)) != srs_success) {
                    return srs_error_wrap(err, "vhost %s notify subscribes ingest=%s added failed", vhost.c_str(), ingest_id.c_str());
                }
            }
            srs_trace("vhost %s reload ingest=%s added success.", vhost.c_str(), ingest_id.c_str());
        }
    }
    
    // for updated ingesters, restart them.
    for (int i = 0; i < (int)new_ingesters.size(); i++) {
        SrsConfDirective* new_ingester = new_ingesters.at(i);
        std::string ingest_id = new_ingester->arg0();
        SrsConfDirective* old_ingester = old_vhost->get("ingest", ingest_id);
        
        // ENABLED => ENABLED
        if (get_ingest_enabled(old_ingester) && get_ingest_enabled(new_ingester)) {
            if (srs_directive_equals(new_ingester, old_ingester)) {
                continue;
            }
            
            // notice handler ingester removed.
            for (it = subscribes.begin(); it != subscribes.end(); ++it) {
                ISrsReloadHandler* subscribe = *it;
                if ((err = subscribe->on_reload_ingest_updated(vhost, ingest_id)) != srs_success) {
                    return srs_error_wrap(err, "vhost %s notify subscribes ingest=%s updated failed", vhost.c_str(), ingest_id.c_str());
                }
            }
            srs_trace("vhost %s reload ingest=%s updated success.", vhost.c_str(), ingest_id.c_str());
        }
    }
    
    srs_trace("ingest nothing changed for vhost=%s", vhost.c_str());
    
    return err;
}

// see: ngx_get_options
// LCOV_EXCL_START
srs_error_t SrsConfig::parse_options(int argc, char** argv)
{
    srs_error_t err = srs_success;
    
    // argv
    for (int i = 0; i < argc; i++) {
        _argv.append(argv[i]);
        
        if (i < argc - 1) {
            _argv.append(" ");
        }
    }
    
    // config
    show_help = true;
    for (int i = 1; i < argc; i++) {
        if ((err = parse_argv(i, argv)) != srs_success) {
            return srs_error_wrap(err, "parse argv");
        }
    }
    
    if (show_help) {
        print_help(argv);
        exit(0);
    }
    
    if (show_version) {
        fprintf(stderr, "%s\n", RTMP_SIG_SRS_VERSION);
        exit(0);
    }
    if (show_signature) {
        fprintf(stderr, "%s\n", RTMP_SIG_SRS_SERVER);
        exit(0);
    }
    
    // first hello message.
    srs_trace(_srs_version);
    
    if (config_file.empty()) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "no config, read help: %s -h", argv[0]);
    }
    
    err = parse_file(config_file.c_str());
    
    if (test_conf) {
        // the parse_file never check the config,
        // we check it when user requires check config file.
        if (err == srs_success && (err = srs_config_transform_vhost(root)) == srs_success) {
            if (err == srs_success && (err = check_config()) == srs_success) {
                srs_trace("config file is ok");
                exit(0);
            }
        }
        
        srs_error("invalid config, %s", srs_error_desc(err).c_str());
        int ret = srs_error_code(err);
        srs_freep(err);
        exit(ret);
    }
    
    // transform config to compatible with previous style of config.
    if ((err = srs_config_transform_vhost(root)) != srs_success) {
        return srs_error_wrap(err, "transform");
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check log name and level
    ////////////////////////////////////////////////////////////////////////
    if (true) {
        std::string log_filename = this->get_log_file();
        if (get_log_tank_file() && log_filename.empty()) {
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "no log file");
        }
        if (get_log_tank_file()) {
            srs_trace("write log to file %s", log_filename.c_str());
            srs_trace("you can: tailf %s", log_filename.c_str());
            srs_trace("@see: %s", SRS_WIKI_URL_LOG);
        } else {
            srs_trace("write log to console");
        }
    }
    
    return err;
}

srs_error_t SrsConfig::initialize_cwd()
{
    // cwd
    char cwd[256];
    getcwd(cwd, sizeof(cwd));
    _cwd = cwd;
    
    return srs_success;
}

srs_error_t SrsConfig::persistence()
{
    srs_error_t err = srs_success;
    
    // write to a tmp file, then mv to the config.
    std::string path = config_file + ".tmp";
    
    // open the tmp file for persistence
    SrsFileWriter fw;
    if ((err = fw.open(path)) != srs_success) {
        return srs_error_wrap(err, "open file");
    }
    
    // do persistence to writer.
    if ((err = do_persistence(&fw)) != srs_success) {
        ::unlink(path.c_str());
        return srs_error_wrap(err, "persistence");
    }
    
    // rename the config file.
    if (::rename(path.c_str(), config_file.c_str()) < 0) {
        ::unlink(path.c_str());
        return srs_error_new(ERROR_SYSTEM_CONFIG_PERSISTENCE, "rename %s=>%s", path.c_str(), config_file.c_str());
    }
    
    return err;
}

srs_error_t SrsConfig::do_persistence(SrsFileWriter* fw)
{
    srs_error_t err = srs_success;
    
    // persistence root directive to writer.
    if ((err = root->persistence(fw, 0)) != srs_success) {
        return srs_error_wrap(err, "root persistence");
    }
    
    return err;
}

srs_error_t SrsConfig::minimal_to_json(SrsJsonObject* obj)
{
    srs_error_t err = srs_success;
    
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* dir = root->directives.at(i);
        if (dir->is_vhost()) {
            continue;
        }
        
        if (dir->name == "listen") {
            obj->set(dir->name, dir->dumps_args());
        }
    }
    
    return err;
}

srs_error_t SrsConfig::global_to_json(SrsJsonObject* obj)
{
    srs_error_t err = srs_success;
    
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* dir = root->directives.at(i);
        if (dir->is_vhost()) {
            continue;
        }
        
        if (dir->name == "listen") {
            obj->set(dir->name, dir->dumps_args());
        } else if (dir->name == "pid") {
            obj->set(dir->name, dir->dumps_arg0_to_str());
        } else if (dir->name == "chunk_size") {
            obj->set(dir->name, dir->dumps_arg0_to_integer());
        } else if (dir->name == "ff_log_dir") {
            obj->set(dir->name, dir->dumps_arg0_to_str());
        } else if (dir->name == "srs_log_tank") {
            obj->set(dir->name, dir->dumps_arg0_to_str());
        } else if (dir->name == "srs_log_level") {
            obj->set(dir->name, dir->dumps_arg0_to_str());
        } else if (dir->name == "srs_log_file") {
            obj->set(dir->name, dir->dumps_arg0_to_str());
        } else if (dir->name == "max_connections") {
            obj->set(dir->name, dir->dumps_arg0_to_integer());
        } else if (dir->name == "daemon") {
            obj->set(dir->name, dir->dumps_arg0_to_boolean());
        } else if (dir->name == "utc_time") {
            obj->set(dir->name, dir->dumps_arg0_to_boolean());
        } else if (dir->name == "pithy_print_ms") {
            obj->set(dir->name, dir->dumps_arg0_to_integer());
        } else if (dir->name == "heartbeat") {
            SrsJsonObject* sobj = SrsJsonAny::object();
            for (int j = 0; j < (int)dir->directives.size(); j++) {
                SrsConfDirective* sdir = dir->directives.at(j);
                if (sdir->name == "enabled") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                } else if (sdir->name == "interval") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_integer());
                } else if (sdir->name == "url") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "device_id") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "summaries") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                }
            }
            obj->set(dir->name, sobj);
        } else if (dir->name == "stats") {
            SrsJsonObject* sobj = SrsJsonAny::object();
            for (int j = 0; j < (int)dir->directives.size(); j++) {
                SrsConfDirective* sdir = dir->directives.at(j);
                if (sdir->name == "network") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_integer());
                } else if (sdir->name == "disk") {
                    sobj->set(sdir->name, sdir->dumps_args());
                }
            }
            obj->set(dir->name, sobj);
        } else if (dir->name == "http_api") {
            SrsJsonObject* sobj = SrsJsonAny::object();
            for (int j = 0; j < (int)dir->directives.size(); j++) {
                SrsConfDirective* sdir = dir->directives.at(j);
                if (sdir->name == "enabled") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                } else if (sdir->name == "listen") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "crossdomain") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                } else if (sdir->name == "raw_api") {
                    SrsJsonObject* ssobj = SrsJsonAny::object();
                    sobj->set(sdir->name, ssobj);
                    
                    for (int j = 0; j < (int)sdir->directives.size(); j++) {
                        SrsConfDirective* ssdir = sdir->directives.at(j);
                        if (ssdir->name == "enabled") {
                            ssobj->set(ssdir->name, ssdir->dumps_arg0_to_boolean());
                        } else if (ssdir->name == "allow_reload") {
                            ssobj->set(ssdir->name, ssdir->dumps_arg0_to_boolean());
                        } else if (ssdir->name == "allow_query") {
                            ssobj->set(ssdir->name, ssdir->dumps_arg0_to_boolean());
                        } else if (ssdir->name == "allow_update") {
                            ssobj->set(ssdir->name, ssdir->dumps_arg0_to_boolean());
                        }
                    }
                }
            }
            obj->set(dir->name, sobj);
        } else if (dir->name == "http_server") {
            SrsJsonObject* sobj = SrsJsonAny::object();
            for (int j = 0; j < (int)dir->directives.size(); j++) {
                SrsConfDirective* sdir = dir->directives.at(j);
                if (sdir->name == "enabled") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                } else if (sdir->name == "listen") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "dir") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                }
            }
            obj->set(dir->name, sobj);
        } else if (dir->name == "stream_caster") {
            SrsJsonObject* sobj = SrsJsonAny::object();
            for (int j = 0; j < (int)dir->directives.size(); j++) {
                SrsConfDirective* sdir = dir->directives.at(j);
                if (sdir->name == "enabled") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                } else if (sdir->name == "caster") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "output") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "listen") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                } else if (sdir->name == "rtp_port_min") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_integer());
                } else if (sdir->name == "rtp_port_max") {
                    sobj->set(sdir->name, sdir->dumps_arg0_to_integer());
                }
            }
            obj->set(dir->name, sobj);
        } else {
            continue;
        }
    }
    
    SrsJsonObject* sobjs = SrsJsonAny::object();
    int nb_vhosts = 0;
    
    SrsStatistic* stat = SrsStatistic::instance();
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* dir = root->directives.at(i);
        if (!dir->is_vhost()) {
            continue;
        }
        
        nb_vhosts++;
        SrsJsonObject* sobj = SrsJsonAny::object();
        sobjs->set(dir->arg0(), sobj);
        
        SrsStatisticVhost* svhost = stat->find_vhost(dir->arg0());
        sobj->set("id", SrsJsonAny::integer(svhost? (double)svhost->id : 0));
        sobj->set("name", dir->dumps_arg0_to_str());
        sobj->set("enabled", SrsJsonAny::boolean(get_vhost_enabled(dir->arg0())));
        
        if (get_dvr_enabled(dir->arg0())) {
            sobj->set("dvr", SrsJsonAny::boolean(true));
        }
        if (get_vhost_http_enabled(dir->arg0())) {
            sobj->set("http_static", SrsJsonAny::boolean(true));
        }
        if (get_vhost_http_remux_enabled(dir->arg0())) {
            sobj->set("http_remux", SrsJsonAny::boolean(true));
        }
        if (get_hls_enabled(dir->arg0())) {
            sobj->set("hls", SrsJsonAny::boolean(true));
        }
        if (get_hds_enabled(dir->arg0())) {
            sobj->set("hds", SrsJsonAny::boolean(true));
        }
        if (get_vhost_http_hooks(dir->arg0())) {
            sobj->set("http_hooks", SrsJsonAny::boolean(true));
        }
        if (get_exec_enabled(dir->arg0())) {
            sobj->set("exec", SrsJsonAny::boolean(true));
        }
        if (get_bw_check_enabled(dir->arg0())) {
            sobj->set("bandcheck", SrsJsonAny::boolean(true));
        }
        if (!get_vhost_is_edge(dir->arg0())) {
            sobj->set("origin", SrsJsonAny::boolean(true));
        }
        if (get_forward_enabled(dir->arg0())) {
            sobj->set("forward", SrsJsonAny::boolean(true));
        }
        
        if (get_security_enabled(dir->arg0())) {
            sobj->set("security", SrsJsonAny::boolean(true));
        }
        if (get_refer_enabled(dir->arg0())) {
            sobj->set("refer", SrsJsonAny::boolean(true));
        }
        
        if (get_mr_enabled(dir->arg0())) {
            sobj->set("mr", SrsJsonAny::boolean(true));
        }
        if (get_realtime_enabled(dir->arg0())) {
            sobj->set("min_latency", SrsJsonAny::boolean(true));
        }
        if (get_gop_cache(dir->arg0())) {
            sobj->set("gop_cache", SrsJsonAny::boolean(true));
        }
        if (get_tcp_nodelay(dir->arg0())) {
            sobj->set("tcp_nodelay", SrsJsonAny::boolean(true));
        }
        
        if (get_mix_correct(dir->arg0())) {
            sobj->set("mix_correct", SrsJsonAny::boolean(true));
        }
        if (get_time_jitter(dir->arg0()) != SrsRtmpJitterAlgorithmOFF) {
            sobj->set("time_jitter", SrsJsonAny::boolean(true));
        }
        if (get_atc(dir->arg0())) {
            sobj->set("atc", SrsJsonAny::boolean(true));
        }
        
        bool has_transcode = false;
        for (int j = 0; !has_transcode && j < (int)dir->directives.size(); j++) {
            SrsConfDirective* sdir = dir->directives.at(j);
            if (sdir->name != "transcode") {
                continue;
            }
            
            if (!get_transcode_enabled(sdir)) {
                continue;
            }
            
            for (int k = 0; !has_transcode && k < (int)sdir->directives.size(); k++) {
                SrsConfDirective* ssdir = sdir->directives.at(k);
                if (ssdir->name != "engine") {
                    continue;
                }
                
                if (get_engine_enabled(ssdir)) {
                    has_transcode = true;
                    break;
                }
            }
        }
        if (has_transcode) {
            sobj->set("transcode", SrsJsonAny::boolean(has_transcode));
        }
        
        bool has_ingest = false;
        for (int j = 0; !has_ingest && j < (int)dir->directives.size(); j++) {
            SrsConfDirective* sdir = dir->directives.at(j);
            if (sdir->name != "ingest") {
                continue;
            }
            
            if (get_ingest_enabled(sdir)) {
                has_ingest = true;
                break;
            }
        }
        if (has_ingest) {
            sobj->set("ingest", SrsJsonAny::boolean(has_ingest));
        }
    }
    
    obj->set("nb_vhosts", SrsJsonAny::integer(nb_vhosts));
    obj->set("vhosts", sobjs);
    
    return err;
}

srs_error_t SrsConfig::vhost_to_json(SrsConfDirective* vhost, SrsJsonObject* obj)
{
    srs_error_t err = srs_success;
    
    SrsConfDirective* dir = NULL;
    
    // always present in vhost.
    SrsStatistic* stat = SrsStatistic::instance();
    
    SrsStatisticVhost* svhost = stat->find_vhost(vhost->arg0());
    obj->set("id", SrsJsonAny::integer(svhost? (double)svhost->id : 0));
    
    obj->set("name", vhost->dumps_arg0_to_str());
    obj->set("enabled", SrsJsonAny::boolean(get_vhost_enabled(vhost)));
    
    // vhost scope configs.
    if ((dir = vhost->get("chunk_size")) != NULL) {
        obj->set("chunk_size", dir->dumps_arg0_to_integer());
    }
    if ((dir = vhost->get("min_latency")) != NULL) {
        obj->set("min_latency", dir->dumps_arg0_to_boolean());
    }
    if ((dir = vhost->get("tcp_nodelay")) != NULL) {
        obj->set("tcp_nodelay", dir->dumps_arg0_to_boolean());
    }
    
    // cluster.
    if ((dir = vhost->get("cluster")) != NULL) {
        SrsJsonObject* cluster = SrsJsonAny::object();
        obj->set("cluster", cluster);
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "mode") {
                cluster->set("mode", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "origin") {
                cluster->set("origin", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "token_traverse") {
                cluster->set("token_traverse", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "vhost") {
                cluster->set("vhost", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "debug_srs_upnode") {
                cluster->set("debug_srs_upnode", sdir->dumps_arg0_to_boolean());
            }
        }
    }
    
    // forward
    if ((dir = vhost->get("forward")) != NULL) {
        SrsJsonObject* forward = SrsJsonAny::object();
        obj->set("forward", forward);
        
        forward->set("enabled", SrsJsonAny::boolean(get_forward_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "destination") {
                forward->set("destination", sdir->dumps_args());
            }
        }
    }
    
    // play
    if ((dir = vhost->get("play")) != NULL) {
        SrsJsonObject* play = SrsJsonAny::object();
        obj->set("play", play);
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "time_jitter") {
                play->set("time_jitter", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "mix_correct") {
                play->set("mix_correct", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "atc") {
                play->set("atc", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "atc_auto") {
                play->set("atc_auto", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "mw_latency") {
                play->set("mw_latency", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "gop_cache") {
                play->set("gop_cache", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "queue_length") {
                play->set("queue_length", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "reduce_sequence_header") {
                play->set("reduce_sequence_header", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "send_min_interval") {
                play->set("send_min_interval", sdir->dumps_arg0_to_integer());
            }
        }
    }
    
    // publish
    if ((dir = vhost->get("publish")) != NULL) {
        SrsJsonObject* publish = SrsJsonAny::object();
        obj->set("publish", publish);
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "mr") {
                publish->set("mr", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "mr_latency") {
                publish->set("mr_latency", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "firstpkt_timeout") {
                publish->set("firstpkt_timeout", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "normal_timeout") {
                publish->set("normal_timeout", sdir->dumps_arg0_to_integer());
            }
        }
    }
    
    // refer
    if ((dir = vhost->get("refer")) != NULL) {
        SrsJsonObject* refer = SrsJsonAny::object();
        obj->set("refer", refer);
        
        refer->set("enabled", SrsJsonAny::boolean(get_refer_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "all") {
                refer->set("all", sdir->dumps_args());
            } else if (sdir->name == "publish") {
                refer->set("publish", sdir->dumps_args());
            } else if (sdir->name == "play") {
                refer->set("play", sdir->dumps_args());
            }
        }
    }
    
    // bandcheck
    if ((dir = vhost->get("bandcheck")) != NULL) {
        SrsJsonObject* bandcheck = SrsJsonAny::object();
        obj->set("bandcheck", bandcheck);
        
        bandcheck->set("enabled", SrsJsonAny::boolean(get_bw_check_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "key") {
                bandcheck->set("key", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "interval") {
                bandcheck->set("interval", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "limit_kbps") {
                bandcheck->set("limit_kbps", sdir->dumps_arg0_to_integer());
            }
        }
    }
    
    // security
    if ((dir = vhost->get("security")) != NULL) {
        SrsJsonObject* security = SrsJsonAny::object();
        obj->set("security", security);
        
        security->set("enabled", SrsJsonAny::boolean(get_security_enabled(vhost->name)));
        
        SrsJsonArray* allows = SrsJsonAny::array();
        security->set("allows", allows);
        
        SrsJsonArray* denies = SrsJsonAny::array();
        security->set("denies", denies);
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "allow") {
                SrsJsonObject* allow = SrsJsonAny::object();
                allow->set("action", SrsJsonAny::str(sdir->name.c_str()));
                allow->set("method", SrsJsonAny::str(sdir->arg0().c_str()));
                allow->set("entry", SrsJsonAny::str(sdir->arg1().c_str()));
                allows->append(allow);
            } else if (sdir->name == "deny") {
                SrsJsonObject* deny = SrsJsonAny::object();
                deny->set("action", SrsJsonAny::str(sdir->name.c_str()));
                deny->set("method", SrsJsonAny::str(sdir->arg0().c_str()));
                deny->set("entry", SrsJsonAny::str(sdir->arg1().c_str()));
                denies->append(deny);
            }
        }
    }
    
    // http_static
    if ((dir = vhost->get("http_static")) != NULL) {
        SrsJsonObject* http_static = SrsJsonAny::object();
        obj->set("http_static", http_static);
        
        http_static->set("enabled", SrsJsonAny::boolean(get_vhost_http_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "mount") {
                http_static->set("mount", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "dir") {
                http_static->set("dir", sdir->dumps_arg0_to_str());
            }
        }
    }
    
    // http_remux
    if ((dir = vhost->get("http_remux")) != NULL) {
        SrsJsonObject* http_remux = SrsJsonAny::object();
        obj->set("http_remux", http_remux);
        
        http_remux->set("enabled", SrsJsonAny::boolean(get_vhost_http_remux_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "fast_cache") {
                http_remux->set("fast_cache", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "mount") {
                http_remux->set("mount", sdir->dumps_arg0_to_str());
            }
        }
    }
    
    // http_hooks
    if ((dir = vhost->get("http_hooks")) != NULL) {
        SrsJsonObject* http_hooks = SrsJsonAny::object();
        obj->set("http_hooks", http_hooks);
        
        http_hooks->set("enabled", SrsJsonAny::boolean(get_vhost_http_hooks_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "on_connect") {
                http_hooks->set("on_connect", sdir->dumps_args());
            } else if (sdir->name == "on_close") {
                http_hooks->set("on_close", sdir->dumps_args());
            } else if (sdir->name == "on_publish") {
                http_hooks->set("on_publish", sdir->dumps_args());
            } else if (sdir->name == "on_unpublish") {
                http_hooks->set("on_unpublish", sdir->dumps_args());
            } else if (sdir->name == "on_play") {
                http_hooks->set("on_play", sdir->dumps_args());
            } else if (sdir->name == "on_stop") {
                http_hooks->set("on_stop", sdir->dumps_args());
            } else if (sdir->name == "on_dvr") {
                http_hooks->set("on_dvr", sdir->dumps_args());
            } else if (sdir->name == "on_hls") {
                http_hooks->set("on_hls", sdir->dumps_args());
            } else if (sdir->name == "on_hls_notify") {
                http_hooks->set("on_hls_notify", sdir->dumps_arg0_to_str());
            }
        }
    }
    
    // hls
    if ((dir = vhost->get("hls")) != NULL) {
        SrsJsonObject* hls = SrsJsonAny::object();
        obj->set("hls", hls);
        
        hls->set("enabled", SrsJsonAny::boolean(get_hls_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "hls_fragment") {
                hls->set("hls_fragment", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hls_td_ratio") {
                hls->set("hls_td_ratio", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hls_aof_ratio") {
                hls->set("hls_aof_ratio", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hls_window") {
                hls->set("hls_window", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hls_on_error") {
                hls->set("hls_on_error", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_storage") {
                hls->set("hls_storage", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_path") {
                hls->set("hls_path", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_m3u8_file") {
                hls->set("hls_m3u8_file", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_ts_file") {
                hls->set("hls_ts_file", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_ts_floor") {
                hls->set("hls_ts_floor", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "hls_entry_prefix") {
                hls->set("hls_entry_prefix", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_mount") {
                hls->set("hls_mount", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_acodec") {
                hls->set("hls_acodec", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_vcodec") {
                hls->set("hls_vcodec", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_cleanup") {
                hls->set("hls_cleanup", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "hls_dispose") {
                hls->set("hls_dispose", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hls_nb_notify") {
                hls->set("hls_nb_notify", sdir->dumps_arg0_to_integer());
            } else if (sdir->name == "hls_dts_directly") {
                hls->set("hls_dts_directly", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "hls_wait_keyframe") {
                hls->set("hls_wait_keyframe", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "hls_keys") {
                hls->set("hls_keys", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "hls_fragments_per_key") {
                hls->set("hls_fragments_per_key", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hls_key_file") {
                hls->set("hls_key_file", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_key_file_path") {
                hls->set("hls_key_file_path", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "hls_key_url") {
                hls->set("hls_key_url", sdir->dumps_arg0_to_str());
            }
        }
    }
    
    // hds
    if ((dir = vhost->get("hds")) != NULL) {
        SrsJsonObject* hds = SrsJsonAny::object();
        obj->set("hds", hds);
        
        hds->set("enabled", SrsJsonAny::boolean(get_hds_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "hds_fragment") {
                hds->set("hds_fragment", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hds_window") {
                hds->set("hds_window", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "hds_path") {
                hds->set("hds_path", sdir->dumps_arg0_to_str());
            }
        }
    }
    
    // dvr
    if ((dir = vhost->get("dvr")) != NULL) {
        SrsJsonObject* dvr = SrsJsonAny::object();
        obj->set("dvr", dvr);
        
        dvr->set("enabled", SrsJsonAny::boolean(get_dvr_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "dvr_plan") {
                dvr->set("dvr_plan", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "dvr_apply") {
                dvr->set("dvr_apply", sdir->dumps_args());
            } else if (sdir->name == "dvr_path") {
                dvr->set("dvr_path", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "dvr_duration") {
                dvr->set("dvr_duration", sdir->dumps_arg0_to_number());
            } else if (sdir->name == "dvr_wait_keyframe") {
                dvr->set("dvr_wait_keyframe", sdir->dumps_arg0_to_boolean());
            } else if (sdir->name == "time_jitter") {
                dvr->set("time_jitter", sdir->dumps_arg0_to_str());
            }
        }
    }
    
    // exec
    if ((dir = vhost->get("exec")) != NULL) {
        SrsJsonObject* ng_exec = SrsJsonAny::object();
        obj->set("exec", ng_exec);
        
        ng_exec->set("enabled", SrsJsonAny::boolean(get_exec_enabled(vhost->name)));
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "publish") {
                ng_exec->set("publish", sdir->dumps_args());
            }
        }
    }
    
    // ingest
    SrsJsonArray* ingests = NULL;
    for (int i = 0; i < (int)vhost->directives.size(); i++) {
        dir = vhost->directives.at(i);
        if (dir->name != "ingest") {
            continue;
        }
        
        if (!ingests) {
            ingests = SrsJsonAny::array();
            obj->set("ingests", ingests);
        }
        
        SrsJsonObject* ingest = SrsJsonAny::object();
        ingest->set("id", dir->dumps_arg0_to_str());
        ingest->set("enabled", SrsJsonAny::boolean(get_ingest_enabled(dir)));
        ingests->append(ingest);
        
        for (int j = 0; j < (int)dir->directives.size(); j++) {
            SrsConfDirective* sdir = dir->directives.at(j);
            
            if (sdir->name == "input") {
                SrsJsonObject* input = SrsJsonAny::object();
                ingest->set("input", input);
                
                SrsConfDirective* type = sdir->get("type");
                if (type) {
                    input->set("type", type->dumps_arg0_to_str());
                }
                
                SrsConfDirective* url = sdir->get("url");
                if (url) {
                    input->set("url", url->dumps_arg0_to_str());
                }
            } else if (sdir->name == "ffmpeg") {
                ingest->set("ffmpeg", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "engine") {
                SrsJsonObject* engine = SrsJsonAny::object();
                ingest->set("engine", engine);
                
                if ((err = srs_config_dumps_engine(sdir, engine)) != srs_success) {
                    return srs_error_wrap(err, "dump engine");
                }
            }
        }
    }
    
    // transcode
    SrsJsonArray* transcodes = NULL;
    for (int i = 0; i < (int)vhost->directives.size(); i++) {
        dir = vhost->directives.at(i);
        if (dir->name != "transcode") {
            continue;
        }
        
        if (!transcodes) {
            transcodes = SrsJsonAny::array();
            obj->set("transcodes", transcodes);
        }
        
        SrsJsonObject* transcode = SrsJsonAny::object();
        transcodes->append(transcode);
        
        transcode->set("apply", dir->dumps_arg0_to_str());
        transcode->set("enabled", SrsJsonAny::boolean(get_transcode_enabled(dir)));
        
        SrsJsonArray* engines = SrsJsonAny::array();
        transcode->set("engines", engines);
        
        for (int i = 0; i < (int)dir->directives.size(); i++) {
            SrsConfDirective* sdir = dir->directives.at(i);
            
            if (sdir->name == "ffmpeg") {
                transcode->set("ffmpeg", sdir->dumps_arg0_to_str());
            } else if (sdir->name == "engine") {
                SrsJsonObject* engine = SrsJsonAny::object();
                engines->append(engine);
                
                if ((err = srs_config_dumps_engine(sdir, engine)) != srs_success) {
                    return srs_error_wrap(err, "dump engine");
                }
            }
        }
    }
    
    return err;
}

srs_error_t SrsConfig::raw_to_json(SrsJsonObject* obj)
{
    srs_error_t err = srs_success;
    
    SrsJsonObject* sobj = SrsJsonAny::object();
    obj->set("http_api", sobj);
    
    sobj->set("enabled", SrsJsonAny::boolean(get_http_api_enabled()));
    sobj->set("listen", SrsJsonAny::str(get_http_api_listen().c_str()));
    sobj->set("crossdomain", SrsJsonAny::boolean(get_http_api_crossdomain()));
    
    SrsJsonObject* ssobj = SrsJsonAny::object();
    sobj->set("raw_api", ssobj);
    
    ssobj->set("enabled", SrsJsonAny::boolean(get_raw_api()));
    ssobj->set("allow_reload", SrsJsonAny::boolean(get_raw_api_allow_reload()));
    ssobj->set("allow_query", SrsJsonAny::boolean(get_raw_api_allow_query()));
    ssobj->set("allow_update", SrsJsonAny::boolean(get_raw_api_allow_update()));
    
    return err;
}

srs_error_t SrsConfig::raw_set_listen(const vector<string>& eps, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get("listen");
    
    // nothing changed, ignore.
    if (srs_vector_actual_equals(conf->args, eps)) {
        return err;
    }
    
    // changed, apply and reload.
    conf->args = eps;
    
    if ((err = do_reload_listen()) != srs_success) {
        return srs_error_wrap(err, "reload listen");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_pid(string pid, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("pid");
    
    if (conf->arg0() == pid) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(pid);
    
    if ((err = do_reload_pid()) != srs_success) {
        return srs_error_wrap(err, "reload pid");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_chunk_size(string chunk_size, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("chunk_size");
    
    if (conf->arg0() == chunk_size) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(chunk_size);
    
    // directly supported reload for chunk_size change.
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_ff_log_dir(string ff_log_dir, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("ff_log_dir");
    
    if (conf->arg0() == ff_log_dir) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(ff_log_dir);
    
    // directly supported reload for ff_log_dir change.
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_srs_log_tank(string srs_log_tank, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("srs_log_tank");
    
    if (conf->arg0() == srs_log_tank) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(srs_log_tank);
    
    if ((err = do_reload_srs_log_tank()) != srs_success) {
        return srs_error_wrap(err, "reload log tank");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_srs_log_level(string srs_log_level, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("srs_log_level");
    
    if (conf->arg0() == srs_log_level) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(srs_log_level);
    
    if ((err = do_reload_srs_log_level()) != srs_success) {
        return srs_error_wrap(err, "reload log level");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_srs_log_file(string srs_log_file, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("srs_log_file");
    
    if (conf->arg0() == srs_log_file) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(srs_log_file);
    
    if ((err = do_reload_srs_log_file()) != srs_success) {
        return srs_error_wrap(err, "reload log file");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_max_connections(string max_connections, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("max_connections");
    
    if (conf->arg0() == max_connections) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(max_connections);
    
    if ((err = do_reload_max_connections()) != srs_success) {
        return srs_error_wrap(err, "reload max connection");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_utc_time(string utc_time, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("utc_time");
    
    if (conf->arg0() == utc_time) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(utc_time);
    
    if ((err = do_reload_utc_time()) != srs_success) {
        return srs_error_wrap(err, "reload");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_set_pithy_print_ms(string pithy_print_ms, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("pithy_print_ms");
    
    if (conf->arg0() == pithy_print_ms) {
        return err;
    }
    
    conf->args.clear();
    conf->args.push_back(pithy_print_ms);
    
    if ((err = do_reload_pithy_print_ms()) != srs_success) {
        return srs_error_wrap(err, "reload pithy print");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_create_vhost(string vhost, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get_or_create("vhost", vhost);
    conf->get_or_create("enabled")->set_arg0("on");
    
    if ((err = do_reload_vhost_added(vhost)) != srs_success) {
        return srs_error_wrap(err, "reload vhost");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_update_vhost(string vhost, string name, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    // the vhost must be disabled, so we donot need to reload.
    SrsConfDirective* conf = root->get_or_create("vhost", vhost);
    conf->set_arg0(name);
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_delete_vhost(string vhost, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    // the vhost must be disabled, so we donot need to reload.
    SrsConfDirective* conf = root->get("vhost", vhost);
    srs_assert(conf);
    
    // remove the directive.
    root->remove(conf);
    srs_freep(conf);
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_disable_vhost(string vhost, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get("vhost", vhost);
    conf->get_or_create("enabled")->set_arg0("off");
    
    if ((err = do_reload_vhost_removed(vhost)) != srs_success) {
        return srs_error_wrap(err, "reload vhost removed");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_enable_vhost(string vhost, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get("vhost", vhost);
    conf->get_or_create("enabled")->set_arg0("on");
    
    if ((err = do_reload_vhost_added(vhost)) != srs_success) {
        return srs_error_wrap(err, "reload vhost added");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_enable_dvr(string vhost, string stream, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get("vhost", vhost);
    conf = conf->get_or_create("dvr")->get_or_create("dvr_apply");
    
    if (conf->args.size() == 1 && (conf->arg0() == "all" || conf->arg0() == "none")) {
        conf->args.clear();
    }
    
    if (::find(conf->args.begin(), conf->args.end(), stream) == conf->args.end()) {
        conf->args.push_back(stream);
    }
    
    if ((err = do_reload_vhost_dvr_apply(vhost)) != srs_success) {
        return srs_error_wrap(err, "reload vhost dvr");
    }
    
    applied = true;
    
    return err;
}

srs_error_t SrsConfig::raw_disable_dvr(string vhost, string stream, bool& applied)
{
    srs_error_t err = srs_success;
    
    applied = false;
    
    SrsConfDirective* conf = root->get("vhost", vhost);
    conf = conf->get_or_create("dvr")->get_or_create("dvr_apply");
    
    std::vector<string>::iterator it;
    
    if ((it = ::find(conf->args.begin(), conf->args.end(), stream)) != conf->args.end()) {
        conf->args.erase(it);
    }
    
    if (conf->args.empty()) {
        conf->args.push_back("none");
    }
    
    if ((err = do_reload_vhost_dvr_apply(vhost)) != srs_success) {
        return srs_error_wrap(err, "reload vhost dvr");
    }
    
    applied = true;
    
    return err;
}
// LCOV_EXCL_STOP

srs_error_t SrsConfig::do_reload_listen()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_listen()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes reload listen failed");
        }
    }
    srs_trace("reload listen success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_pid()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_pid()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes reload pid failed");
        }
    }
    srs_trace("reload pid success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_srs_log_tank()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_log_tank()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes reload srs_log_tank failed");
        }
    }
    srs_trace("reload srs_log_tank success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_srs_log_level()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_log_level()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes reload srs_log_level failed");
        }
    }
    srs_trace("reload srs_log_level success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_srs_log_file()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_log_file()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes reload srs_log_file failed");
        }
    }
    srs_trace("reload srs_log_file success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_max_connections()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_max_conns()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes reload max_connections failed");
        }
    }
    srs_trace("reload max_connections success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_utc_time()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_utc_time()) != srs_success) {
            return srs_error_wrap(err, "utc_time");
        }
    }
    srs_trace("reload utc_time success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_pithy_print_ms()
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_pithy_print()) != srs_success) {
            return srs_error_wrap(err, "notify subscribes pithy_print_ms failed");
        }
    }
    srs_trace("reload pithy_print_ms success.");
    
    return err;
}

srs_error_t SrsConfig::do_reload_vhost_added(string vhost)
{
    srs_error_t err = srs_success;
    
    srs_trace("vhost %s added, reload it.", vhost.c_str());
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_vhost_added(vhost)) != srs_success) {
            return srs_error_wrap(err, "notify subscribes added vhost %s failed", vhost.c_str());
        }
    }
    
    srs_trace("reload new vhost %s success.", vhost.c_str());
    
    return err;
}

srs_error_t SrsConfig::do_reload_vhost_removed(string vhost)
{
    srs_error_t err = srs_success;
    
    srs_trace("vhost %s removed, reload it.", vhost.c_str());
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_vhost_removed(vhost)) != srs_success) {
            return srs_error_wrap(err, "notify subscribes removed vhost %s failed", vhost.c_str());
        }
    }
    srs_trace("reload removed vhost %s success.", vhost.c_str());
    
    return err;
}

srs_error_t SrsConfig::do_reload_vhost_dvr_apply(string vhost)
{
    srs_error_t err = srs_success;
    
    vector<ISrsReloadHandler*>::iterator it;
    for (it = subscribes.begin(); it != subscribes.end(); ++it) {
        ISrsReloadHandler* subscribe = *it;
        if ((err = subscribe->on_reload_vhost_dvr_apply(vhost)) != srs_success) {
            return srs_error_wrap(err, "vhost %s notify subscribes dvr_apply failed", vhost.c_str());
        }
    }
    srs_trace("vhost %s reload dvr_apply success.", vhost.c_str());
    
    return err;
}

string SrsConfig::config()
{
    return config_file;
}

// LCOV_EXCL_START
srs_error_t SrsConfig::parse_argv(int& i, char** argv)
{
    srs_error_t err = srs_success;
    
    char* p = argv[i];
    
    if (*p++ != '-') {
        show_help = true;
        return err;
    }
    
    while (*p) {
        switch (*p++) {
            case '?':
            case 'h':
                show_help = true;
                break;
            case 't':
                show_help = false;
                test_conf = true;
                break;
            case 'p':
                dolphin = true;
                if (*p) {
                    dolphin_rtmp_port = p;
                    continue;
                }
                if (argv[++i]) {
                    dolphin_rtmp_port = argv[i];
                    continue;
                }
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "-p requires params");
            case 'x':
                dolphin = true;
                if (*p) {
                    dolphin_http_port = p;
                    continue;
                }
                if (argv[++i]) {
                    dolphin_http_port = argv[i];
                    continue;
                }
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "-x requires params");
            case 'v':
            case 'V':
                show_help = false;
                show_version = true;
                break;
            case 'g':
            case 'G':
                show_help = false;
                show_signature = true;
                break;
            case 'c':
                show_help = false;
                if (*p) {
                    config_file = p;
                    continue;
                }
                if (argv[++i]) {
                    config_file = argv[i];
                    continue;
                }
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "-c requires params");
            default:
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "invalid option: \"%c\", read help: %s -h",
                    *(p - 1), argv[0]);
        }
    }
    
    return err;
}

void SrsConfig::print_help(char** argv)
{
    printf(
           RTMP_SIG_SRS_SERVER ", " RTMP_SIG_SRS_URL ", licensed under " RTMP_SIG_SRS_LICENSE
           ", built at " SRS_AUTO_BUILD_DATE ", configured by " SRS_AUTO_USER_CONFIGURE
           ", which means " SRS_AUTO_CONFIGURE "\n""\n"
           "Usage: %s <-h?vVgG>|<[-t] -c filename>\n"
           "Options:\n"
           "   -?, -h              : Show this help and exit 0.\n"
           "   -v, -V              : Show version and exit 0.\n"
           "   -g, -G              : Show server signature and exit 0.\n"
           "   -t                  : Test configuration file, exit with error code(0 for success).\n"
           "   -c filename         : Use config file to start server.\n"
           "For example:\n"
           "   %s -v\n"
           "   %s -t -c " SRS_CONF_DEFAULT_COFNIG_FILE "\n"
           "   %s -c " SRS_CONF_DEFAULT_COFNIG_FILE "\n",
           argv[0], argv[0], argv[0], argv[0]);
}

srs_error_t SrsConfig::parse_file(const char* filename)
{
    srs_error_t err = srs_success;
    
    config_file = filename;
    
    if (config_file.empty()) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "empty config");
    }
    
    SrsConfigBuffer buffer;
    
    if ((err = buffer.fullfill(config_file.c_str())) != srs_success) {
        return srs_error_wrap(err, "buffer fullfil");
    }
    
    if ((err = parse_buffer(&buffer)) != srs_success) {
        return srs_error_wrap(err, "parse buffer");
    }
    
    return err;
}
// LCOV_EXCL_STOP

srs_error_t SrsConfig::check_config()
{
    srs_error_t err = srs_success;
    
    if ((err = check_normal_config()) != srs_success) {
        return srs_error_wrap(err, "check normal");
    }
    
    if ((err = check_number_connections()) != srs_success) {
        return srs_error_wrap(err, "check connections");
    }
    
    return err;
}

srs_error_t SrsConfig::check_normal_config()
{
    srs_error_t err = srs_success;
    
    srs_trace("srs checking config...");
    
    ////////////////////////////////////////////////////////////////////////
    // check empty
    ////////////////////////////////////////////////////////////////////////
    if (root->directives.size() == 0) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "conf is empty");
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check root directives.
    ////////////////////////////////////////////////////////////////////////
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* conf = root->at(i);
        std::string n = conf->name;
        if (n != "listen" && n != "pid" && n != "chunk_size" && n != "ff_log_dir"
            && n != "srs_log_tank" && n != "srs_log_level" && n != "srs_log_file"
            && n != "max_connections" && n != "daemon" && n != "heartbeat"
            && n != "http_api" && n != "stats" && n != "vhost" && n != "pithy_print_ms"
            && n != "http_server" && n != "stream_caster"
            && n != "utc_time" && n != "work_dir" && n != "asprocess"
            && n != "ff_log_level" && n != "grace_final_wait"
            ) {
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal directive %s", n.c_str());
        }
    }
    if (true) {
        SrsConfDirective* conf = root->get("http_api");
        for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
            SrsConfDirective* obj = conf->at(i);
            string n = obj->name;
            if (n != "enabled" && n != "listen" && n != "crossdomain" && n != "raw_api") {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal http_api.%s", n.c_str());
            }
            
            if (n == "raw_api") {
                for (int j = 0; j < (int)obj->directives.size(); j++) {
                    string m = obj->at(j)->name;
                    if (m != "enabled" && m != "allow_reload" && m != "allow_query" && m != "allow_update") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal http_api.raw_api.%s", m.c_str());
                    }
                }
            }
        }
    }
    if (true) {
        SrsConfDirective* conf = root->get("http_server");
        for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
            string n = conf->at(i)->name;
            if (n != "enabled" && n != "listen" && n != "dir" && n != "crossdomain") {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal http_stream.%s", n.c_str());
            }
        }
    }
    if (true) {
        SrsConfDirective* conf = get_heartbeart();
        for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
            string n = conf->at(i)->name;
            if (n != "enabled" && n != "interval" && n != "url"
                && n != "device_id" && n != "summaries") {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal heartbeat.%s", n.c_str());
            }
        }
    }
    if (true) {
        SrsConfDirective* conf = get_stats();
        for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
            string n = conf->at(i)->name;
            if (n != "network" && n != "disk") {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal stats.%s", n.c_str());
            }
        }
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check listen for rtmp.
    ////////////////////////////////////////////////////////////////////////
    if (true) {
        vector<string> listens = get_listens();
        if (listens.size() <= 0) {
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "listen requires params");
        }
        for (int i = 0; i < (int)listens.size(); i++) {
            string port = listens[i];
            if (port.empty() || ::atoi(port.c_str()) <= 0) {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "listen.port=%d is invalid", port.c_str());
            }
        }
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check heartbeat
    ////////////////////////////////////////////////////////////////////////
    if (get_heartbeat_interval() <= 0) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "invalid heartbeat.interval=%" PRId64,
            get_heartbeat_interval());
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check stats
    ////////////////////////////////////////////////////////////////////////
    if (get_stats_network() < 0) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "invalid stats.network=%d", get_stats_network());
    }
    if (true) {
        vector<std::string> ips = srs_get_local_ips();
        int index = get_stats_network();
        if (index >= (int)ips.size()) {
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "invalid stats.network=%d of %d",
                index, (int)ips.size());
        }
        srs_warn("stats network use index=%d, ip=%s", index, ips.at(index).c_str());
    }
    if (true) {
        SrsConfDirective* conf = get_stats_disk_device();
        if (conf == NULL || (int)conf->args.size() <= 0) {
            srs_warn("stats disk not configed, disk iops disabled.");
        } else {
            string disks;
            for (int i = 0; i < (int)conf->args.size(); i++) {
                disks += conf->args.at(i);
                disks += " ";
            }
            srs_warn("stats disk list: %s", disks.c_str());
        }
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check http api
    ////////////////////////////////////////////////////////////////////////
    if (get_http_api_listen().empty()) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "http_api.listen requires params");
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check http stream
    ////////////////////////////////////////////////////////////////////////
    if (get_http_stream_listen().empty()) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "http_stream.listen requires params");
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check log name and level
    ////////////////////////////////////////////////////////////////////////
    if (true) {
        std::string log_filename = this->get_log_file();
        if (get_log_tank_file() && log_filename.empty()) {
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "log file is empty");
        }
        if (get_log_tank_file()) {
            srs_trace("write log to file %s", log_filename.c_str());
            srs_trace("you can: tailf %s", log_filename.c_str());
            srs_trace("@see: %s", SRS_WIKI_URL_LOG);
        } else {
            srs_trace("write log to console");
        }
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check features
    ////////////////////////////////////////////////////////////////////////
    vector<SrsConfDirective*> stream_casters = get_stream_casters();
    for (int n = 0; n < (int)stream_casters.size(); n++) {
        SrsConfDirective* stream_caster = stream_casters[n];
        for (int i = 0; stream_caster && i < (int)stream_caster->directives.size(); i++) {
            SrsConfDirective* conf = stream_caster->at(i);
            string n = conf->name;
            if (n != "enabled" && n != "caster" && n != "output"
                && n != "listen" && n != "rtp_port_min" && n != "rtp_port_max") {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal stream_caster.%s", n.c_str());
            }
        }
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check vhosts.
    ////////////////////////////////////////////////////////////////////////
    vector<SrsConfDirective*> vhosts;
    get_vhosts(vhosts);
    for (int n = 0; n < (int)vhosts.size(); n++) {
        SrsConfDirective* vhost = vhosts[n];
        for (int i = 0; vhost && i < (int)vhost->directives.size(); i++) {
            SrsConfDirective* conf = vhost->at(i);
            string n = conf->name;
            if (n != "enabled" && n != "chunk_size" && n != "min_latency" && n != "tcp_nodelay"
                && n != "dvr" && n != "ingest" && n != "hls" && n != "http_hooks"
                && n != "refer" && n != "forward" && n != "transcode" && n != "bandcheck"
                && n != "play" && n != "publish" && n != "cluster"
                && n != "security" && n != "http_remux" && n != "dash"
                && n != "http_static" && n != "hds" && n != "exec"
                && n != "in_ack_size" && n != "out_ack_size") {
                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.%s", n.c_str());
            }
            // for each sub directives of vhost.
            if (n == "dvr") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled"  && m != "dvr_apply" && m != "dvr_path" && m != "dvr_plan"
                        && m != "dvr_duration" && m != "dvr_wait_keyframe" && m != "time_jitter") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.dvr.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "refer") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "all" && m != "publish" && m != "play") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.refer.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "exec") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "publish") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.exec.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "play") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "time_jitter" && m != "mix_correct" && m != "atc" && m != "atc_auto" && m != "mw_latency"
                        && m != "gop_cache" && m != "queue_length" && m != "send_min_interval" && m != "reduce_sequence_header") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.play.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "cluster") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "mode" && m != "origin" && m != "token_traverse" && m != "vhost" && m != "debug_srs_upnode" && m != "coworkers"
                        && m != "origin_cluster") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.cluster.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "publish") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "mr" && m != "mr_latency" && m != "firstpkt_timeout" && m != "normal_timeout" && m != "parse_sps") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.publish.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "ingest") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "input" && m != "ffmpeg" && m != "engine") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.ingest.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "http_static") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "mount" && m != "dir") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.http_static.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "http_remux") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "mount" && m != "fast_cache") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.http_remux.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "dash") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "dash_fragment" && m != "dash_update_period" && m != "dash_timeshift" && m != "dash_path"
                        && m != "dash_mpd_file") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.dash.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "hls") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "hls_entry_prefix" && m != "hls_path" && m != "hls_fragment" && m != "hls_window" && m != "hls_on_error"
                        && m != "hls_storage" && m != "hls_mount" && m != "hls_td_ratio" && m != "hls_aof_ratio" && m != "hls_acodec" && m != "hls_vcodec"
                        && m != "hls_m3u8_file" && m != "hls_ts_file" && m != "hls_ts_floor" && m != "hls_cleanup" && m != "hls_nb_notify"
                        && m != "hls_wait_keyframe" && m != "hls_dispose" && m != "hls_keys" && m != "hls_fragments_per_key" && m != "hls_key_file"
                        && m != "hls_key_file_path" && m != "hls_key_url" && m != "hls_dts_directly") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.hls.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                    
                    // TODO: FIXME: remove it in future.
                    if (m == "hls_storage" || m == "hls_mount") {
                        srs_warn("HLS RAM is removed in SRS3+, read https://github.com/ossrs/srs/issues/513.");
                    }
                }
            } else if (n == "http_hooks") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "on_connect" && m != "on_close" && m != "on_publish"
                        && m != "on_unpublish" && m != "on_play" && m != "on_stop"
                        && m != "on_dvr" && m != "on_hls" && m != "on_hls_notify") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.http_hooks.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "forward") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "destination") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.forward.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "security") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    SrsConfDirective* security = conf->at(j);
                    string m = security->name.c_str();
                    if (m != "enabled" && m != "deny" && m != "allow") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.security.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            } else if (n == "transcode") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    SrsConfDirective* trans = conf->at(j);
                    string m = trans->name.c_str();
                    if (m != "enabled" && m != "ffmpeg" && m != "engine") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.transcode.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                    if (m == "engine") {
                        for (int k = 0; k < (int)trans->directives.size(); k++) {
                            string e = trans->at(k)->name;
                            if (e != "enabled" && e != "vfilter" && e != "vcodec"
                                && e != "vbitrate" && e != "vfps" && e != "vwidth" && e != "vheight"
                                && e != "vthreads" && e != "vprofile" && e != "vpreset" && e != "vparams"
                                && e != "acodec" && e != "abitrate" && e != "asample_rate" && e != "achannels"
                                && e != "aparams" && e != "output" && e != "perfile"
                                && e != "iformat" && e != "oformat") {
                                return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.transcode.engine.%s of %s", m.c_str(), vhost->arg0().c_str());
                            }
                        }
                    }
                }
            } else if (n == "bandcheck") {
                for (int j = 0; j < (int)conf->directives.size(); j++) {
                    string m = conf->at(j)->name;
                    if (m != "enabled" && m != "key" && m != "interval" && m != "limit_kbps") {
                        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.bandcheck.%s of %s", m.c_str(), vhost->arg0().c_str());
                    }
                }
            }
        }
    }
    // check ingest id unique.
    for (int i = 0; i < (int)vhosts.size(); i++) {
        SrsConfDirective* vhost = vhosts[i];
        std::vector<std::string> ids;
        
        for (int j = 0; j < (int)vhost->directives.size(); j++) {
            SrsConfDirective* conf = vhost->at(j);
            if (conf->name != "ingest") {
                continue;
            }
            
            std::string id = conf->arg0();
            for (int k = 0; k < (int)ids.size(); k++) {
                if (id == ids.at(k)) {
                    return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "ingest id=%s exists for %s",
                        id.c_str(), vhost->arg0().c_str());
                }
            }
            ids.push_back(id);
        }
    }
    
    ////////////////////////////////////////////////////////////////////////
    // check chunk size
    ////////////////////////////////////////////////////////////////////////
    if (get_global_chunk_size() < SRS_CONSTS_RTMP_MIN_CHUNK_SIZE
        || get_global_chunk_size() > SRS_CONSTS_RTMP_MAX_CHUNK_SIZE) {
        srs_warn("chunk_size=%s should be in [%d, %d]", get_global_chunk_size(),
            SRS_CONSTS_RTMP_MIN_CHUNK_SIZE, SRS_CONSTS_RTMP_MAX_CHUNK_SIZE);
    }
    for (int i = 0; i < (int)vhosts.size(); i++) {
        SrsConfDirective* vhost = vhosts[i];
        if (get_chunk_size(vhost->arg0()) < SRS_CONSTS_RTMP_MIN_CHUNK_SIZE
            || get_chunk_size(vhost->arg0()) > SRS_CONSTS_RTMP_MAX_CHUNK_SIZE) {
            srs_warn("chunk_size=%s of %s should be in [%d, %d]", get_global_chunk_size(), vhost->arg0().c_str(),
                SRS_CONSTS_RTMP_MIN_CHUNK_SIZE, SRS_CONSTS_RTMP_MAX_CHUNK_SIZE);
        }
    }
    
    // asprocess conflict with daemon
    if (get_asprocess() && get_daemon()) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "daemon conflicts with asprocess");
    }
    
    return err;
}

// LCOV_EXCL_START
srs_error_t SrsConfig::check_number_connections()
{
    srs_error_t err = srs_success;
    
    ////////////////////////////////////////////////////////////////////////
    // check max connections
    ////////////////////////////////////////////////////////////////////////
    if (get_max_connections() <= 0) {
        return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "max_connections=%d is invalid", get_max_connections());
    }
    
    // check max connections of system limits
    if (true) {
        int nb_consumed_fds = (int)get_listens().size();
        if (!get_http_api_listen().empty()) {
            nb_consumed_fds++;
        }
        if (!get_http_stream_listen().empty()) {
            nb_consumed_fds++;
        }
        if (get_log_tank_file()) {
            nb_consumed_fds++;
        }
        // 0, 1, 2 for stdin, stdout and stderr.
        nb_consumed_fds += 3;
        
        int nb_connections = get_max_connections();
        int nb_total = nb_connections + nb_consumed_fds;
        
        int max_open_files = (int)sysconf(_SC_OPEN_MAX);
        int nb_canbe = max_open_files - nb_consumed_fds - 1;
        
        // for each play connections, we open a pipe(2fds) to convert SrsConsumver to io,
        // refine performance, @see: https://github.com/ossrs/srs/issues/194
        if (nb_total >= max_open_files) {
            srs_error("invalid max_connections=%d, required=%d, system limit to %d, "
                      "total=%d(max_connections=%d, nb_consumed_fds=%d). "
                      "you can change max_connections from %d to %d, or "
                      "you can login as root and set the limit: ulimit -HSn %d",
                      nb_connections, nb_total + 100, max_open_files,
                      nb_total, nb_connections, nb_consumed_fds,
                      nb_connections, nb_canbe, nb_total + 100);
            return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "%d exceed max open files=%d",
                nb_total, max_open_files);
        }
    }
    
    return err;
}
// LCOV_EXCL_STOP

srs_error_t SrsConfig::parse_buffer(SrsConfigBuffer* buffer)
{
    srs_error_t err = srs_success;

    // We use a new root to parse buffer, to allow parse multiple times.
    srs_freep(root);
    root = new SrsConfDirective();

    // Parse root tree from buffer.
    if ((err = root->parse(buffer)) != srs_success) {
        return srs_error_wrap(err, "root parse");
    }
    
    // mock by dolphin mode.
    // for the dolphin will start srs with specified params.
    if (dolphin) {
        // for RTMP.
        set_config_directive(root, "listen", dolphin_rtmp_port);
        
        // for HTTP
        set_config_directive(root, "http_server", "");
        SrsConfDirective* http_server = root->get("http_server");
        set_config_directive(http_server, "enabled", "on");
        set_config_directive(http_server, "listen", dolphin_http_port);
        
        // others.
        set_config_directive(root, "daemon", "off");
        set_config_directive(root, "srs_log_tank", "console");
    }
    
    return err;
}

string SrsConfig::cwd()
{
    return _cwd;
}

string SrsConfig::argv()
{
    return _argv;
}

bool SrsConfig::get_daemon()
{
    SrsConfDirective* conf = root->get("daemon");
    if (!conf || conf->arg0().empty()) {
        return true;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_root()
{
    return root;
}

int SrsConfig::get_max_connections()
{
    static int DEFAULT = 1000;
    
    SrsConfDirective* conf = root->get("max_connections");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

vector<string> SrsConfig::get_listens()
{
    std::vector<string> ports;
    
    SrsConfDirective* conf = root->get("listen");
    if (!conf) {
        return ports;
    }
    
    for (int i = 0; i < (int)conf->args.size(); i++) {
        ports.push_back(conf->args.at(i));
    }
    
    return ports;
}

string SrsConfig::get_pid_file()
{
    static string DEFAULT = "./objs/srs.pid";
    
    SrsConfDirective* conf = root->get("pid");
    
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

srs_utime_t SrsConfig::get_pithy_print()
{
    static srs_utime_t DEFAULT = 10 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = root->get("pithy_print_ms");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

bool SrsConfig::get_utc_time()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = root->get("utc_time");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_work_dir() {
    static string DEFAULT = "./";
    
    SrsConfDirective* conf = root->get("work_dir");
    if( !conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_asprocess()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = root->get("asprocess");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_grace_final_wait()
{
    static srs_utime_t DEFAULT = 3200 * SRS_UTIME_MILLISECONDS;

    SrsConfDirective* conf = root->get("grace_final_wait");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }

    return (srs_utime_t)(::atol(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

vector<SrsConfDirective*> SrsConfig::get_stream_casters()
{
    srs_assert(root);
    
    std::vector<SrsConfDirective*> stream_casters;
    
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* conf = root->at(i);
        
        if (!conf->is_stream_caster()) {
            continue;
        }
        
        stream_casters.push_back(conf);
    }
    
    return stream_casters;
}

bool SrsConfig::get_stream_caster_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = false;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_stream_caster_engine(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("caster");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_stream_caster_output(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("output");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

int SrsConfig::get_stream_caster_listen(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("listen");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_stream_caster_rtp_port_min(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("rtp_port_min");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_stream_caster_rtp_port_max(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("rtp_port_max");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

SrsConfDirective* SrsConfig::get_vhost(string vhost, bool try_default_vhost)
{
    srs_assert(root);
    
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* conf = root->at(i);
        
        if (!conf->is_vhost()) {
            continue;
        }
        
        if (conf->arg0() == vhost) {
            return conf;
        }
    }
    
    if (try_default_vhost && vhost != SRS_CONSTS_RTMP_DEFAULT_VHOST) {
        return get_vhost(SRS_CONSTS_RTMP_DEFAULT_VHOST);
    }
    
    return NULL;
}

void SrsConfig::get_vhosts(vector<SrsConfDirective*>& vhosts)
{
    srs_assert(root);
    
    for (int i = 0; i < (int)root->directives.size(); i++) {
        SrsConfDirective* conf = root->at(i);
        
        if (!conf->is_vhost()) {
            continue;
        }
        
        vhosts.push_back(conf);
    }
}

bool SrsConfig::get_vhost_enabled(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    
    return get_vhost_enabled(conf);
}

bool SrsConfig::get_vhost_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = true;
    
    // false for NULL vhost.
    if (!conf) {
        return false;
    }
    
    // perfer true for exists one.
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_gop_cache(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return SRS_PERF_GOP_CACHE;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return SRS_PERF_GOP_CACHE;
    }
    
    conf = conf->get("gop_cache");
    if (!conf || conf->arg0().empty()) {
        return SRS_PERF_GOP_CACHE;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_debug_srs_upnode(string vhost)
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("cluster");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("debug_srs_upnode");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_atc(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("atc");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

bool SrsConfig::get_atc_auto(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("atc_auto");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

int SrsConfig::get_time_jitter(string vhost)
{
    static string DEFAULT = "full";
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return _srs_time_jitter_string2int(DEFAULT);
    }
    
    conf = conf->get("play");
    if (!conf) {
        return _srs_time_jitter_string2int(DEFAULT);
    }
    
    conf = conf->get("time_jitter");
    if (!conf || conf->arg0().empty()) {
        return _srs_time_jitter_string2int(DEFAULT);
    }
    
    return _srs_time_jitter_string2int(conf->arg0());
}

bool SrsConfig::get_mix_correct(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("mix_correct");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_queue_length(string vhost)
{
    static srs_utime_t DEFAULT = SRS_PERF_PLAY_QUEUE;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("queue_length");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atoi(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

bool SrsConfig::get_refer_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("refer");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_refer_all(string vhost)
{
    static SrsConfDirective* DEFAULT = NULL;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("refer");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->get("all");
}

SrsConfDirective* SrsConfig::get_refer_play(string vhost)
{
    static SrsConfDirective* DEFAULT = NULL;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("refer");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->get("play");
}

SrsConfDirective* SrsConfig::get_refer_publish(string vhost)
{
    static SrsConfDirective* DEFAULT = NULL;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("refer");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->get("publish");
}

int SrsConfig::get_in_ack_size(string vhost)
{
    static int DEFAULT = 0;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("in_ack_size");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_out_ack_size(string vhost)
{
    static int DEFAULT = 2500000;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("out_ack_size");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_chunk_size(string vhost)
{
    if (vhost.empty()) {
        return get_global_chunk_size();
    }
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        // vhost does not specify the chunk size,
        // use the global instead.
        return get_global_chunk_size();
    }
    
    conf = conf->get("chunk_size");
    if (!conf || conf->arg0().empty()) {
        // vhost does not specify the chunk size,
        // use the global instead.
        return get_global_chunk_size();
    }
    
    return ::atoi(conf->arg0().c_str());
}

bool SrsConfig::get_parse_sps(string vhost)
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = get_vhost(vhost);
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("publish");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("parse_sps");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_mr_enabled(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return SRS_PERF_MR_ENABLED;
    }
    
    conf = conf->get("publish");
    if (!conf) {
        return SRS_PERF_MR_ENABLED;
    }
    
    conf = conf->get("mr");
    if (!conf || conf->arg0().empty()) {
        return SRS_PERF_MR_ENABLED;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_mr_sleep(string vhost)
{
    static srs_utime_t DEFAULT = SRS_PERF_MR_SLEEP;

    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("publish");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("mr_latency");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

srs_utime_t SrsConfig::get_mw_sleep(string vhost)
{
    static srs_utime_t DEFAULT = SRS_PERF_MW_SLEEP;

    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("mw_latency");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

bool SrsConfig::get_realtime_enabled(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return SRS_PERF_MIN_LATENCY_ENABLED;
    }
    
    conf = conf->get("min_latency");
    if (!conf || conf->arg0().empty()) {
        return SRS_PERF_MIN_LATENCY_ENABLED;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

bool SrsConfig::get_tcp_nodelay(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("tcp_nodelay");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_send_min_interval(string vhost)
{
    static srs_utime_t DEFAULT = 0;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("send_min_interval");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atof(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

bool SrsConfig::get_reduce_sequence_header(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("play");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("reduce_sequence_header");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_publish_1stpkt_timeout(string vhost)
{
    // when no msg recevied for publisher, use larger timeout.
    static srs_utime_t DEFAULT = 20 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("publish");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("firstpkt_timeout");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

srs_utime_t SrsConfig::get_publish_normal_timeout(string vhost)
{
    // the timeout for publish recv.
    // we must use more smaller timeout, for the recv never know the status
    // of underlayer socket.
    static srs_utime_t DEFAULT = 5 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("publish");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("normal_timeout");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_MILLISECONDS);
}

int SrsConfig::get_global_chunk_size()
{
    SrsConfDirective* conf = root->get("chunk_size");
    if (!conf || conf->arg0().empty()) {
        return SRS_CONSTS_RTMP_SRS_CHUNK_SIZE;
    }
    
    return ::atoi(conf->arg0().c_str());
}

bool SrsConfig::get_forward_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("forward");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_forwards(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    conf = conf->get("forward");
    if (!conf) {
        return NULL;
    }
    
    return conf->get("destination");
}

SrsConfDirective* SrsConfig::get_vhost_http_hooks(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("http_hooks");
}

bool SrsConfig::get_vhost_http_hooks_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_vhost_on_connect(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_connect");
}

SrsConfDirective* SrsConfig::get_vhost_on_close(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_close");
}

SrsConfDirective* SrsConfig::get_vhost_on_publish(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_publish");
}

SrsConfDirective* SrsConfig::get_vhost_on_unpublish(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_unpublish");
}

SrsConfDirective* SrsConfig::get_vhost_on_play(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_play");
}

SrsConfDirective* SrsConfig::get_vhost_on_stop(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_stop");
}

SrsConfDirective* SrsConfig::get_vhost_on_dvr(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_dvr");
}

SrsConfDirective* SrsConfig::get_vhost_on_hls(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_hls");
}

SrsConfDirective* SrsConfig::get_vhost_on_hls_notify(string vhost)
{
    SrsConfDirective* conf = get_vhost_http_hooks(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("on_hls_notify");
}

bool SrsConfig::get_bw_check_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("bandcheck");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_bw_check_key(string vhost)
{
    static string DEFAULT = "";
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("bandcheck");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("key");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

srs_utime_t SrsConfig::get_bw_check_interval(string vhost)
{
    static int64_t DEFAULT = 30 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("bandcheck");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("interval");
    if (!conf) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

int SrsConfig::get_bw_check_limit_kbps(string vhost)
{
    static int DEFAULT = 1000;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("bandcheck");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("limit_kbps");
    if (!conf) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

bool SrsConfig::get_vhost_is_edge(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    return get_vhost_is_edge(conf);
}

bool SrsConfig::get_vhost_is_edge(SrsConfDirective* vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = vhost;
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("cluster");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("mode");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return "remote" == conf->arg0();
}

SrsConfDirective* SrsConfig::get_vhost_edge_origin(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    conf = conf->get("cluster");
    if (!conf) {
        return NULL;
    }
    
    return conf->get("origin");
}

bool SrsConfig::get_vhost_edge_token_traverse(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("cluster");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("token_traverse");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_vhost_edge_transform_vhost(string vhost)
{
    static string DEFAULT = "[vhost]";
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("cluster");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vhost");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_vhost_origin_cluster(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("cluster");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("origin_cluster");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

vector<string> SrsConfig::get_vhost_coworkers(string vhost)
{
    vector<string> coworkers;

    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return coworkers;
    }

    conf = conf->get("cluster");
    if (!conf) {
        return coworkers;
    }

    conf = conf->get("coworkers");
    for (int i = 0; i < (int)conf->args.size(); i++) {
        coworkers.push_back(conf->args.at(i));
    }

    return coworkers;
}

bool SrsConfig::get_security_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    SrsConfDirective* security = conf->get("security");
    if (!security) {
        return DEFAULT;
    }
    
    conf = security->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_security_rules(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("security");
}

SrsConfDirective* SrsConfig::get_transcode(string vhost, string scope)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    conf = conf->get("transcode");
    if (!conf || conf->arg0() != scope) {
        return NULL;
    }
    
    return conf;
}

bool SrsConfig::get_transcode_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = false;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_transcode_ffmpeg(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("ffmpeg");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

vector<SrsConfDirective*> SrsConfig::get_transcode_engines(SrsConfDirective* conf)
{
    vector<SrsConfDirective*> engines;
    
    if (!conf) {
        return engines;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* engine = conf->directives[i];
        
        if (engine->name == "engine") {
            engines.push_back(engine);
        }
    }
    
    return engines;
}

bool SrsConfig::get_engine_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = false;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string srs_prefix_underscores_ifno(string name)
{
    if (srs_string_starts_with(name, "-")) {
        return name;
    } else {
        return "-" + name;
    }
}

vector<string> SrsConfig::get_engine_perfile(SrsConfDirective* conf)
{
    vector<string> perfile;
    
    if (!conf) {
        return perfile;
    }
    
    conf = conf->get("perfile");
    if (!conf) {
        return perfile;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* option = conf->directives[i];
        if (!option) {
            continue;
        }
        
        perfile.push_back(srs_prefix_underscores_ifno(option->name));
        if (!option->arg0().empty()) {
            perfile.push_back(option->arg0());
        }
    }
    
    return perfile;
}

string SrsConfig::get_engine_iformat(SrsConfDirective* conf)
{
    static string DEFAULT = "flv";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("iformat");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

vector<string> SrsConfig::get_engine_vfilter(SrsConfDirective* conf)
{
    vector<string> vfilter;
    
    if (!conf) {
        return vfilter;
    }
    
    conf = conf->get("vfilter");
    if (!conf) {
        return vfilter;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* filter = conf->directives[i];
        if (!filter) {
            continue;
        }
        
        vfilter.push_back(srs_prefix_underscores_ifno(filter->name));
        if (!filter->arg0().empty()) {
            vfilter.push_back(filter->arg0());
        }
    }
    
    return vfilter;
}

string SrsConfig::get_engine_vcodec(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vcodec");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

int SrsConfig::get_engine_vbitrate(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vbitrate");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

double SrsConfig::get_engine_vfps(SrsConfDirective* conf)
{
    static double DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vfps");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atof(conf->arg0().c_str());
}

int SrsConfig::get_engine_vwidth(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vwidth");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_engine_vheight(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vheight");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_engine_vthreads(SrsConfDirective* conf)
{
    static int DEFAULT = 1;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vthreads");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

string SrsConfig::get_engine_vprofile(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vprofile");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_engine_vpreset(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("vpreset");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

vector<string> SrsConfig::get_engine_vparams(SrsConfDirective* conf)
{
    vector<string> vparams;
    
    if (!conf) {
        return vparams;
    }
    
    conf = conf->get("vparams");
    if (!conf) {
        return vparams;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* filter = conf->directives[i];
        if (!filter) {
            continue;
        }
        
        vparams.push_back(srs_prefix_underscores_ifno(filter->name));
        if (!filter->arg0().empty()) {
            vparams.push_back(filter->arg0());
        }
    }
    
    return vparams;
}

string SrsConfig::get_engine_acodec(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("acodec");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

int SrsConfig::get_engine_abitrate(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("abitrate");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_engine_asample_rate(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("asample_rate");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

int SrsConfig::get_engine_achannels(SrsConfDirective* conf)
{
    static int DEFAULT = 0;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("achannels");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

vector<string> SrsConfig::get_engine_aparams(SrsConfDirective* conf)
{
    vector<string> aparams;
    
    if (!conf) {
        return aparams;
    }
    
    conf = conf->get("aparams");
    if (!conf) {
        return aparams;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* filter = conf->directives[i];
        if (!filter) {
            continue;
        }
        
        aparams.push_back(srs_prefix_underscores_ifno(filter->name));
        if (!filter->arg0().empty()) {
            aparams.push_back(filter->arg0());
        }
    }
    
    return aparams;
}

string SrsConfig::get_engine_oformat(SrsConfDirective* conf)
{
    static string DEFAULT = "flv";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("oformat");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_engine_output(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("output");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

SrsConfDirective* SrsConfig::get_exec(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("exec");
}

bool SrsConfig::get_exec_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_exec(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

vector<SrsConfDirective*> SrsConfig::get_exec_publishs(string vhost)
{
    vector<SrsConfDirective*> eps;
    
    SrsConfDirective* conf = get_exec(vhost);
    if (!conf) {
        return eps;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* ep = conf->at(i);
        if (ep->name == "publish") {
            eps.push_back(ep);
        }
    }
    
    return eps;
}

vector<SrsConfDirective*> SrsConfig::get_ingesters(string vhost)
{
    vector<SrsConfDirective*> integers;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return integers;
    }
    
    for (int i = 0; i < (int)conf->directives.size(); i++) {
        SrsConfDirective* ingester = conf->directives[i];
        
        if (ingester->name == "ingest") {
            integers.push_back(ingester);
        }
    }
    
    return integers;
}

SrsConfDirective* SrsConfig::get_ingest_by_id(string vhost, string ingest_id)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("ingest", ingest_id);
}

bool SrsConfig::get_ingest_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = false;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_ingest_ffmpeg(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("ffmpeg");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_ingest_input_type(SrsConfDirective* conf)
{
    static string DEFAULT = "file";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("input");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("type");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_ingest_input_url(SrsConfDirective* conf)
{
    static string DEFAULT = "";
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("input");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("url");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_log_tank_file()
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = root->get("srs_log_tank");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0() != "console";
}

string SrsConfig::get_log_level()
{
    static string DEFAULT = "trace";
    
    SrsConfDirective* conf = root->get("srs_log_level");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_log_file()
{
    static string DEFAULT = "./objs/srs.log";
    
    SrsConfDirective* conf = root->get("srs_log_file");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_ff_log_enabled()
{
    string log = get_ff_log_dir();
    return log != SRS_CONSTS_NULL_FILE;
}

string SrsConfig::get_ff_log_dir()
{
    static string DEFAULT = "./objs";
    
    SrsConfDirective* conf = root->get("ff_log_dir");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_ff_log_level()
{
    static string DEFAULT = "info";

    SrsConfDirective* conf = root->get("ff_log_level");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }

    return conf->arg0();
}

SrsConfDirective* SrsConfig::get_dash(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    return conf? conf->get("dash") : NULL;
}

bool SrsConfig::get_dash_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_dash(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_dash_fragment(string vhost)
{
    static int DEFAULT = 30 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_dash(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dash_fragment");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

srs_utime_t SrsConfig::get_dash_update_period(string vhost)
{
    static srs_utime_t DEFAULT = 150 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_dash(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dash_update_period");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

srs_utime_t SrsConfig::get_dash_timeshift(string vhost)
{
    static srs_utime_t DEFAULT = 300 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_dash(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dash_timeshift");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

string SrsConfig::get_dash_path(string vhost)
{
    static string DEFAULT = "./objs/nginx/html";
    
    SrsConfDirective* conf = get_dash(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dash_path");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_dash_mpd_file(string vhost)
{
    static string DEFAULT = "[app]/[stream].mpd";
    
    SrsConfDirective* conf = get_dash(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dash_mpd_file");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

SrsConfDirective* SrsConfig::get_hls(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    return conf? conf->get("hls") : NULL;
}

bool SrsConfig::get_hls_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_hls(vhost);
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_hls_entry_prefix(string vhost)
{
    static string DEFAULT = "";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_entry_prefix");
    if (!conf) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_path(string vhost)
{
    static string DEFAULT = "./objs/nginx/html";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_path");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_m3u8_file(string vhost)
{
    static string DEFAULT = "[app]/[stream].m3u8";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_m3u8_file");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_ts_file(string vhost)
{
    static string DEFAULT = "[app]/[stream]-[seq].ts";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_ts_file");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_hls_ts_floor(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_ts_floor");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_hls_fragment(string vhost)
{
    static srs_utime_t DEFAULT = 10 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_fragment");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

double SrsConfig::get_hls_td_ratio(string vhost)
{
    static double DEFAULT = 1.5;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_td_ratio");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atof(conf->arg0().c_str());
}

double SrsConfig::get_hls_aof_ratio(string vhost)
{
    static double DEFAULT = 2.0;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_aof_ratio");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atof(conf->arg0().c_str());
}

srs_utime_t SrsConfig::get_hls_window(string vhost)
{
    static srs_utime_t DEFAULT = (60 * SRS_UTIME_SECONDS);
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_window");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

string SrsConfig::get_hls_on_error(string vhost)
{
    // try to ignore the error.
    static string DEFAULT = "continue";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_on_error");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_acodec(string vhost)
{
    static string DEFAULT = "aac";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_acodec");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_vcodec(string vhost)
{
    static string DEFAULT = "h264";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_vcodec");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

int SrsConfig::get_vhost_hls_nb_notify(string vhost)
{
    static int DEFAULT = 64;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_nb_notify");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

bool SrsConfig::get_vhost_hls_dts_directly(string vhost)
{
    static bool DEFAULT = true;

    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }

    conf = conf->get("hls_dts_directly");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }

    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_hls_cleanup(string vhost)
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_cleanup");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

srs_utime_t SrsConfig::get_hls_dispose(string vhost)
{
    static srs_utime_t DEFAULT = 0;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_dispose");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

bool SrsConfig::get_hls_wait_keyframe(string vhost)
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_wait_keyframe");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_hls_keys(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_keys");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

int SrsConfig::get_hls_fragments_per_key(string vhost)
{
    static int DEFAULT = 5;
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_fragments_per_key");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

string SrsConfig::get_hls_key_file(string vhost)
{
    static string DEFAULT = "[app]/[stream]-[seq].key";
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_key_file");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_key_file_path(std::string vhost)
{
     //put the key in ts path defaultly.
    static string DEFAULT = get_hls_path(vhost);
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_key_file_path");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_hls_key_url(std::string vhost)
{
     //put the key in ts path defaultly.
    static string DEFAULT = get_hls_path(vhost);
    
    SrsConfDirective* conf = get_hls(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hls_key_url");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

SrsConfDirective *SrsConfig::get_hds(const string &vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    
    if (!conf) {
        return NULL;
    }
    
    return conf->get("hds");
}

bool SrsConfig::get_hds_enabled(const string &vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_hds(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_hds_path(const string &vhost)
{
    static string DEFAULT = "./objs/nginx/html";
    
    SrsConfDirective* conf = get_hds(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hds_path");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

srs_utime_t SrsConfig::get_hds_fragment(const string &vhost)
{
    static srs_utime_t DEFAULT = (10 * SRS_UTIME_SECONDS);
    
    SrsConfDirective* conf = get_hds(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hds_fragment");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

srs_utime_t SrsConfig::get_hds_window(const string &vhost)
{
    static srs_utime_t DEFAULT = (60 * SRS_UTIME_SECONDS);
    
    SrsConfDirective* conf = get_hds(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("hds_window");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

SrsConfDirective* SrsConfig::get_dvr(string vhost)
{
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return NULL;
    }
    
    return conf->get("dvr");
}

bool SrsConfig::get_dvr_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_dvr(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_dvr_apply(string vhost)
{
    SrsConfDirective* conf = get_dvr(vhost);
    if (!conf) {
        return NULL;
    }
    
    conf = conf->get("dvr_apply");
    if (!conf || conf->arg0().empty()) {
        return NULL;
    }
    
    return conf;
    
}

string SrsConfig::get_dvr_path(string vhost)
{
    static string DEFAULT = "./objs/nginx/html/[app]/[stream].[timestamp].flv";
    
    SrsConfDirective* conf = get_dvr(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dvr_path");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_dvr_plan(string vhost)
{
    static string DEFAULT = "session";
    
    SrsConfDirective* conf = get_dvr(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dvr_plan");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

srs_utime_t SrsConfig::get_dvr_duration(string vhost)
{
    static srs_utime_t DEFAULT = 30 * SRS_UTIME_SECONDS;
    
    SrsConfDirective* conf = get_dvr(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dvr_duration");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atoi(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

bool SrsConfig::get_dvr_wait_keyframe(string vhost)
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = get_dvr(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dvr_wait_keyframe");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

int SrsConfig::get_dvr_time_jitter(string vhost)
{
    static string DEFAULT = "full";
    
    SrsConfDirective* conf = get_dvr(vhost);
    
    if (!conf) {
        return _srs_time_jitter_string2int(DEFAULT);
    }
    
    conf = conf->get("time_jitter");
    if (!conf || conf->arg0().empty()) {
        return _srs_time_jitter_string2int(DEFAULT);
    }
    
    return _srs_time_jitter_string2int(conf->arg0());
}

bool SrsConfig::get_http_api_enabled()
{
    SrsConfDirective* conf = root->get("http_api");
    return get_http_api_enabled(conf);
}

bool SrsConfig::get_http_api_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = false;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_http_api_listen()
{
    static string DEFAULT = "1985";
    
    SrsConfDirective* conf = root->get("http_api");
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("listen");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_http_api_crossdomain()
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = root->get("http_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("crossdomain");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_raw_api()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = root->get("http_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("raw_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

bool SrsConfig::get_raw_api_allow_reload()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = root->get("http_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("raw_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("allow_reload");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

bool SrsConfig::get_raw_api_allow_query()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = root->get("http_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("raw_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("allow_query");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

bool SrsConfig::get_raw_api_allow_update()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = root->get("http_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("raw_api");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("allow_update");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

bool SrsConfig::get_http_stream_enabled()
{
    SrsConfDirective* conf = root->get("http_server");
    return get_http_stream_enabled(conf);
}

bool SrsConfig::get_http_stream_enabled(SrsConfDirective* conf)
{
    static bool DEFAULT = false;
    
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_http_stream_listen()
{
    static string DEFAULT = "8080";
    
    SrsConfDirective* conf = root->get("http_server");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("listen");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_http_stream_dir()
{
    static string DEFAULT = "./objs/nginx/html";
    
    SrsConfDirective* conf = root->get("http_server");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dir");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_http_stream_crossdomain()
{
    static bool DEFAULT = true;
    
    SrsConfDirective* conf = root->get("http_server");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("crossdomain");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_TRUE(conf->arg0());
}

bool SrsConfig::get_vhost_http_enabled(string vhost)
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("http_static");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

string SrsConfig::get_vhost_http_mount(string vhost)
{
    static string DEFAULT = "[vhost]/";
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("http_static");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("mount");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_vhost_http_dir(string vhost)
{
    static string DEFAULT = "./objs/nginx/html";
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("http_static");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("dir");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_vhost_http_remux_enabled(string vhost)
{
    static bool DEFAULT = false;

    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }

    conf = conf->get("http_remux");
    if (!conf) {
        return DEFAULT;
    }

    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }

    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_vhost_http_remux_fast_cache(string vhost)
{
    static srs_utime_t DEFAULT = 0;
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("http_remux");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("fast_cache");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return srs_utime_t(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

string SrsConfig::get_vhost_http_remux_mount(string vhost)
{
    static string DEFAULT = "[vhost]/[app]/[stream].flv";
    
    SrsConfDirective* conf = get_vhost(vhost);
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("http_remux");
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("mount");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

SrsConfDirective* SrsConfig::get_heartbeart()
{
    return root->get("heartbeat");
}

bool SrsConfig::get_heartbeat_enabled()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_heartbeart();
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("enabled");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

srs_utime_t SrsConfig::get_heartbeat_interval()
{
    static srs_utime_t DEFAULT = (srs_utime_t)(9.9 * SRS_UTIME_SECONDS);
    
    SrsConfDirective* conf = get_heartbeart();
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("interval");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return (srs_utime_t)(::atof(conf->arg0().c_str()) * SRS_UTIME_SECONDS);
}

string SrsConfig::get_heartbeat_url()
{
    static string DEFAULT = "http://" SRS_CONSTS_LOCALHOST ":8085/api/v1/servers";
    
    SrsConfDirective* conf = get_heartbeart();
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("url");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

string SrsConfig::get_heartbeat_device_id()
{
    static string DEFAULT = "";
    
    SrsConfDirective* conf = get_heartbeart();
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("device_id");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return conf->arg0();
}

bool SrsConfig::get_heartbeat_summaries()
{
    static bool DEFAULT = false;
    
    SrsConfDirective* conf = get_heartbeart();
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("summaries");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return SRS_CONF_PERFER_FALSE(conf->arg0());
}

SrsConfDirective* SrsConfig::get_stats()
{
    return root->get("stats");
}

int SrsConfig::get_stats_network()
{
    static int DEFAULT = 0;
    
    SrsConfDirective* conf = get_stats();
    if (!conf) {
        return DEFAULT;
    }
    
    conf = conf->get("network");
    if (!conf || conf->arg0().empty()) {
        return DEFAULT;
    }
    
    return ::atoi(conf->arg0().c_str());
}

SrsConfDirective* SrsConfig::get_stats_disk_device()
{
    SrsConfDirective* conf = get_stats();
    if (!conf) {
        return NULL;
    }
    
    conf = conf->get("disk");
    if (!conf || conf->args.size() == 0) {
        return NULL;
    }
    
    return conf;
}