Support include empty config file. v5.0.173 v6.0.68 (#3768)

SRS supports including another configuration in the include package.
When generating configurations, we can only generate the changed
configurations, while the unchanged configurations are in the fixed
files, for example:

```nginx
listen 1935;
include server.conf;
```

In `server.conf`, we can manage the changing configurations with the
program:

```nginx
http_api { enabled on; }
```

However, during system initialization, we often create an empty
`server.conf`, and the content is generated only after the program
starts, so `server.conf` might be an empty file. This also makes it
convenient to use a script to confirm the existence of this file:

```bash
touch server.conf
```

Currently, SRS does not support empty configurations and will report an
error. This PR is to solve this problem, making it more convenient to
use include.

`TRANS_BY_GPT4`

---------

Co-authored-by: Haibo Chen <495810242@qq.com>

README.md

@@ -12,7 +12,7 @@
 [![](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fossrs%2Fsrs.svg?type=small)](https://app.fossa.com/projects/git%2Bgithub.com%2Fossrs%2Fsrs?ref=badge_small)
 [![](https://ossrs.net/wiki/images/srs-faq.svg)](https://ossrs.net/lts/zh-cn/faq)
 [![](https://badgen.net/badge/srs/stackoverflow/orange?icon=terminal)](https://stackoverflow.com/questions/tagged/simple-realtime-server)
-[![](https://opencollective.com/srs-server/tiers/badge.svg)](https://opencollective.com/srs-server/contribute)
+[![](https://opencollective.com/srs-server/tiers/badge.svg)](https://opencollective.com/srs-server)
 [![](https://img.shields.io/docker/pulls/ossrs/srs)](https://hub.docker.com/r/ossrs/srs/tags)
 [![](https://ossrs.net/wiki/images/do-btn-srs-125x20.svg)](https://cloud.digitalocean.com/droplets/new?appId=133468816&size=s-1vcpu-512mb-10gb&region=sgp1&image=ossrs-srs&type=applications)
 [![](https://api.securityscorecards.dev/projects/github.com/ossrs/srs/badge)](https://api.securityscorecards.dev/projects/github.com/ossrs/srs)
@@ -104,16 +104,25 @@ Here are some other important wikis:
 * Usage: What are the strategies for improving edge performance on multiple CPUs? ([CN](https://ossrs.net/lts/zh-cn/docs/v5/doc/reuse-port), [EN](https://ossrs.io/lts/en-us/docs/v5/doc/reuse-port))
 * Usage: How can bugs be reported or contact be made with us? ([CN](https://ossrs.net/lts/zh-cn/contact), [EN](https://ossrs.io/lts/en-us/contact))
 
+## Sponsor
+
+Would you like additional assistance from us? By becoming a sponsor or backer of SRS, we can provide you 
+with the support you need:
+
+* Backer: $5 per month, online text chat support through Discord.
+* Sponsor: $100 per month, online meeting support, 1 meeting per month in 1 hour.
+
+Please visit [OpenCollective](https://opencollective.com/srs-server) to become a backer or sponsor, and send 
+us a direct message on [Discord](https://discord.gg/yZ4BnPmHAd). We are currently providing support to the 
+developers listed below:
+
+[![](https://opencollective.com/srs-server/backers.svg?width=800&button=false)](https://opencollective.com/srs-server)
+
+We at SRS aim to establish a non-profit, open-source community that assists developers worldwide in creating 
+their own high-quality streaming and RTC platforms to support your businesses.
+
 ## AUTHORS
 
-We highly appreciate all our contributors for their significant contributions that have made a remarkable difference. 
-Thank you! 🙏
-
-If you wish to support this project financially, you can donate [through Open Collective](https://opencollective.com/srs-server). 
-We appreciate your contribution!
-
-[![](https://opencollective.com/srs-server/backers.svg?width=800&button=true)](https://opencollective.com/srs-server/contribute/backer-34941/checkout?interval=month&amount=5)
-
 The [TOC(Technical Oversight Committee)](trunk/AUTHORS.md#toc) and [contributors](trunk/AUTHORS.md#contributors):
 
 * [Winlin](https://github.com/winlinvip): Founder of the project, focusing on ST and Issues/PR. Responsible for architecture and maintenance.

trunk/configure

@@ -434,7 +434,7 @@ fi
 if [[ $SRS_UTEST == YES ]]; then
     MODULE_FILES=("srs_utest" "srs_utest_amf0" "srs_utest_kernel" "srs_utest_core"
         "srs_utest_config" "srs_utest_rtmp" "srs_utest_http" "srs_utest_avc" "srs_utest_reload"
-        "srs_utest_mp4" "srs_utest_service" "srs_utest_app" "srs_utest_rtc"
+        "srs_utest_mp4" "srs_utest_service" "srs_utest_app" "srs_utest_rtc" "srs_utest_config2"
         "srs_utest_protocol" "srs_utest_protocol2" "srs_utest_kernel2")
     if [[ $SRS_SRT == YES ]]; then
         MODULE_FILES+=("srs_utest_srt")

trunk/doc/CHANGELOG.md

@@ -7,6 +7,7 @@ The changelog for SRS.
 <a name="v6-changes"></a>
 
 ## SRS 6.0 Changelog
+* v6.0, 2023-08-28, Merge [#3768](https://github.com/ossrs/srs/pull/3768): Support include empty config file. v6.0.68 (#3768)
 * v6.0, 2023-08-25, Merge [#3782](https://github.com/ossrs/srs/pull/3782): HLS: Support reload HLS asynchronously. v6.0.67 (#3782)
 * v6.0, 2023-08-22, Merge [#3775](https://github.com/ossrs/srs/pull/3775): Bugfix: Log format output type does not match. v6.0.66 (#3699)
 * v6.0, 2023-08-02, Merge [#3750](https://github.com/ossrs/srs/pull/3750): HLS: Ignore empty NALU to avoid error. v6.0.64 (#3750)
@@ -79,7 +80,8 @@ The changelog for SRS.
 <a name="v5-changes"></a>
 
 ## SRS 5.0 Changelog
-* v5.0, 2023-08-25, Merge [#3782](https://github.com/ossrs/srs/pull/3782): HLS: Support reload HLS asynchronously.. v5.0.171 (#3782)
+* v5.0, 2023-08-28, Merge [#3768](https://github.com/ossrs/srs/pull/3768): Support include empty config file. v5.0.173 (#3768)
+* v5.0, 2023-08-25, Merge [#3782](https://github.com/ossrs/srs/pull/3782): HLS: Support reload HLS asynchronously. v5.0.172 (#3782)
 * v5.0, 2023-08-22, Merge [#3775](https://github.com/ossrs/srs/pull/3775): Bugfix: Log format output type does not match. v5.0.171 (#3699)
 * v5.0, 2023-08-02, HLS: Ignore empty NALU to avoid error. v5.0.170
 * v5.0, 2023-07-26, Merge [#3699](https://github.com/ossrs/srs/pull/3699): Bugfix: Eliminate the redundant declaration of the _srs_rtc_manager variable. v5.0.168 (#3699)

trunk/src/app/srs_app_config.cpp

@@ -123,6 +123,8 @@ namespace srs_internal
         
         // read all.
         int filesize = (int)reader.filesize();
+        // Ignore if empty file.
+        if (filesize <= 0) return err;
         
         // create buffer
         srs_freepa(start);
@@ -1069,6 +1071,9 @@ srs_error_t SrsConfDirective::parse_conf(SrsConfigBuffer* buffer, SrsDirectiveCo
 {
     srs_error_t err = srs_success;
 
+    // Ignore empty config file.
+    if (ctx == SrsDirectiveContextFile && buffer->empty()) return err;
+    
     while (true) {
         std::vector<string> args;
         int line_start = 0;
@@ -1127,7 +1132,7 @@ srs_error_t SrsConfDirective::parse_conf(SrsConfigBuffer* buffer, SrsDirectiveCo
             }
 
             if ((err = parse_conf(include_file_buffer, SrsDirectiveContextFile, conf)) != srs_success) {
-                return srs_error_wrap(err, "parse include buffer");
+                return srs_error_wrap(err, "parse include buffer %s", file.c_str());
             }
         }
     }
@@ -2197,11 +2202,11 @@ srs_error_t SrsConfig::parse_file(const char* filename)
     SrsConfigBuffer* buffer = NULL;
     SrsAutoFree(SrsConfigBuffer, buffer);
     if ((err = build_buffer(config_file, &buffer)) != srs_success) {
-        return srs_error_wrap(err, "buffer fullfill %s", config_file.c_str());
+        return srs_error_wrap(err, "buffer fullfill %s", filename);
     }
     
     if ((err = parse_buffer(buffer)) != srs_success) {
-        return srs_error_wrap(err, "parse buffer");
+        return srs_error_wrap(err, "parse buffer %s", filename);
     }
     
     return err;

trunk/src/core/srs_core_version5.hpp

@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       5
 #define VERSION_MINOR       0
-#define VERSION_REVISION    172
+#define VERSION_REVISION    173
 
 #endif

trunk/src/core/srs_core_version6.hpp

@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       6
 #define VERSION_MINOR       0
-#define VERSION_REVISION    67
+#define VERSION_REVISION    68
 
 #endif

trunk/src/utest/srs_utest_config.cpp

@@ -85,11 +85,14 @@ srs_error_t MockSrsConfig::build_buffer(std::string src, srs_internal::SrsConfig
 {
     srs_error_t err = srs_success;
 
-    string content = included_files[src];
+    // No file, error.
-    if(content.empty()) {
+    if(included_files.find(src) == included_files.end()) {
         return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "file %s: no found", src.c_str());
     }
 
+    string content = included_files[src];
+
+    // Empty file, ok.
     *pbuffer = new MockSrsConfigBuffer(content);
 
     return err;
@@ -690,9 +693,29 @@ VOID TEST(ConfigDirectiveTest, ParseInvalidNoEndOfSubDirective)
 {
     srs_error_t err;
 
-    MockSrsConfigBuffer buf("dir0 {");
+    if (true) {
-    SrsConfDirective conf;
+        MockSrsConfigBuffer buf("");
-    HELPER_ASSERT_FAILED(conf.parse(&buf));
+        SrsConfDirective conf;
+        HELPER_ASSERT_SUCCESS(conf.parse(&buf));
+    }
+
+    if (true) {
+        MockSrsConfigBuffer buf("# OK");
+        SrsConfDirective conf;
+        HELPER_ASSERT_SUCCESS(conf.parse(&buf));
+    }
+
+    if (true) {
+        MockSrsConfigBuffer buf("dir0 {");
+        SrsConfDirective conf;
+        HELPER_ASSERT_FAILED(conf.parse(&buf));
+    }
+
+    if (true) {
+        MockSrsConfigBuffer buf("dir0 {} dir1 {");
+        SrsConfDirective conf;
+        HELPER_ASSERT_FAILED(conf.parse(&buf));
+    }
 }
 
 VOID TEST(ConfigDirectiveTest, ParseInvalidNoStartOfSubDirective)

trunk/src/utest/srs_utest_config2.cpp

@@ -0,0 +1,47 @@
+//
+// Copyright (c) 2013-2023 The SRS Authors
+//
+// SPDX-License-Identifier: MIT or MulanPSL-2.0
+//
+#include <srs_utest_config2.hpp>
+
+#include <srs_kernel_error.hpp>
+#include <srs_kernel_file.hpp>
+#include <srs_utest_kernel.hpp>
+
+VOID TEST(ConfigMainTest, CheckIncludeEmptyConfig)
+{
+    srs_error_t err;
+
+    if (true) {
+        string filepath = _srs_tmp_file_prefix + "utest-main.conf";
+        MockFileRemover _mfr(filepath);
+
+        string included = _srs_tmp_file_prefix + "utest-included-empty.conf";
+        MockFileRemover _mfr2(included);
+
+        if (true) {
+            SrsFileWriter fw;
+            fw.open(included);
+        }
+
+        if (true) {
+            SrsFileWriter fw;
+            fw.open(filepath);
+            string content = _MIN_OK_CONF "include " + included + ";";
+            fw.write((void*)content.data(), (int)content.length(), NULL);
+        }
+
+        SrsConfig conf;
+        HELPER_ASSERT_SUCCESS(conf.parse_file(filepath.c_str()));
+        EXPECT_EQ(1, (int)conf.get_listens().size());
+    }
+
+    if (true) {
+        MockSrsConfig conf;
+        conf.mock_include("test.conf", "");
+        HELPER_ASSERT_SUCCESS(conf.parse(_MIN_OK_CONF "include test.conf;"));
+        EXPECT_EQ(1, (int)conf.get_listens().size());
+    }
+}
+

trunk/src/utest/srs_utest_config2.hpp

@@ -0,0 +1,16 @@
+//
+// Copyright (c) 2013-2023 The SRS Authors
+//
+// SPDX-License-Identifier: MIT or MulanPSL-2.0
+//
+
+#ifndef SRS_UTEST_CONFIG2_HPP
+#define SRS_UTEST_CONFIG2_HPP
+
+/*
+#include <srs_utest_config2.hpp>
+*/
+#include <srs_utest_config.hpp>
+
+#endif
+