Log: Use 8 bytes random string as context id

trunk/src/app/srs_app_rtc_conn.cpp

@@ -57,20 +57,6 @@ using namespace std;
 #include <srs_app_rtc_server.hpp>
 #include <srs_app_rtc_source.hpp>
 
-// TODO: FIXME: Move to utility.
-string gen_random_str(int len)
-{
-    static string random_table = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
-
-    string ret;
-    ret.reserve(len);
-    for (int i = 0; i < len; ++i) {
-        ret.append(1, random_table[random() % random_table.size()]);
-    }
-
-    return ret;
-}
-
 uint64_t SrsNtp::kMagicNtpFractionalUnit = 1ULL << 32;
 
 SrsNtp::SrsNtp()

trunk/src/app/srs_app_rtc_conn.hpp

@@ -75,9 +75,6 @@ const uint8_t kSLI  = 2;
 const uint8_t kRPSI = 3;
 const uint8_t kAFB  = 15;
 
-// TODO: FIXME: Move to utility.
-extern std::string gen_random_str(int len);
-
 class SrsNtp
 {
 public:

trunk/src/app/srs_app_rtc_server.cpp

@@ -37,6 +37,7 @@
 #include <srs_app_http_api.hpp>
 #include <srs_app_rtc_dtls.hpp>
 #include <srs_service_utility.hpp>
+#include <srs_protocol_utility.hpp>
 #include <srs_app_rtc_source.hpp>
 #include <srs_app_rtc_api.hpp>
 
@@ -310,12 +311,12 @@ srs_error_t SrsRtcServer::create_session(
         return srs_error_new(ERROR_RTC_SOURCE_BUSY, "stream %s busy", req->get_stream_url().c_str());
     }
 
-    std::string local_pwd = gen_random_str(32);
+    std::string local_pwd = srs_random_str(32);
     std::string local_ufrag = "";
     // TODO: FIXME: Rename for a better name, it's not an username.
     std::string username = "";
     while (true) {
-        local_ufrag = gen_random_str(8);
+        local_ufrag = srs_random_str(8);
 
         username = local_ufrag + ":" + remote_sdp.get_ice_ufrag();
         if (!map_username_session.count(username)) {
@@ -361,9 +362,9 @@ srs_error_t SrsRtcServer::create_session2(SrsSdp& local_sdp, SrsRtcConnection**
 {
     srs_error_t err = srs_success;
 
-    std::string local_pwd = gen_random_str(32);
+    std::string local_pwd = srs_random_str(32);
     // TODO: FIXME: Collision detect.
-    std::string local_ufrag = gen_random_str(8);
+    std::string local_ufrag = srs_random_str(8);
 
     SrsRtcConnection* session = new SrsRtcConnection(this);
     *psession = session;

trunk/src/protocol/srs_protocol_utility.cpp

@@ -148,20 +148,39 @@ void srs_parse_query_string(string q, map<string,string>& query)
     }
 }
 
+static bool _random_initialized = false;
+
 void srs_random_generate(char* bytes, int size)
 {
-    static bool _random_initialized = false;
     if (!_random_initialized) {
-        srand(0);
         _random_initialized = true;
+        ::srandom((unsigned long)(srs_update_system_time() | (::getpid()<<13)));
     }
     
     for (int i = 0; i < size; i++) {
         // the common value in [0x0f, 0xf0]
-        bytes[i] = 0x0f + (rand() % (256 - 0x0f - 0x0f));
+        bytes[i] = 0x0f + (random() % (256 - 0x0f - 0x0f));
     }
 }
 
+std::string srs_random_str(int len)
+{
+    if (!_random_initialized) {
+        _random_initialized = true;
+        ::srandom((unsigned long)(srs_update_system_time() | (::getpid()<<13)));
+    }
+
+    static string random_table = "01234567890123456789012345678901234567890123456789abcdefghijklmnopqrstuvwxyz";
+
+    string ret;
+    ret.reserve(len);
+    for (int i = 0; i < len; ++i) {
+        ret.append(1, random_table[random() % random_table.size()]);
+    }
+
+    return ret;
+}
+
 string srs_generate_tc_url(string host, string vhost, string app, int port)
 {
     string tcUrl = "rtmp://";

trunk/src/protocol/srs_protocol_utility.hpp

@@ -65,11 +65,12 @@ extern void srs_discovery_tc_url(std::string tcUrl, std::string& schema, std::st
 // must format as key=value&...&keyN=valueN
 extern void srs_parse_query_string(std::string q, std::map<std::string, std::string>& query);
 
-/**
- * generate ramdom data for handshake.
- */
+// Generate ramdom data for handshake.
 extern void srs_random_generate(char* bytes, int size);
 
+// Generate random string [0-9a-z] in size of len bytes.
+extern std::string srs_random_str(int len);
+
 /**
  * generate the tcUrl without param.
  * @remark Use host as tcUrl.vhost if vhost is default vhost.

trunk/src/protocol/srs_service_log.cpp

@@ -31,6 +31,7 @@ using namespace std;
 
 #include <srs_kernel_error.hpp>
 #include <srs_kernel_utility.hpp>
+#include <srs_protocol_utility.hpp>
 
 #define SRS_BASIC_LOG_SIZE 1024
 
@@ -44,14 +45,7 @@ SrsThreadContext::~SrsThreadContext()
 
 SrsContextId SrsThreadContext::generate_id()
 {
-    static int id = 0;
-
-    if (id == 0) {
-        id = (100 + ((uint32_t)(int64_t)this)%1000);
-    }
-    int gid = id++;
-
-    SrsContextId cid = SrsContextId(srs_int2str(gid));
+    SrsContextId cid = SrsContextId(srs_random_str(8));
     cache[srs_thread_self()] = cid;
     return cid;
 }