support max_connections, drop if exceed.

@@ -185,6 +185,9 @@ usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
 * nginx v1.5.0: 139524 lines <br/>
 
 ### History
+* v0.8, 2013-12-06, support max_connections, drop if exceed.
+* v0.8, 2013-12-05, support log_dir, write ffmpeg log to file.
+* v0.8, 2013-12-05, fix the forward/hls/encoder bug.
 * v0.7, 2013-12-03, v0.7 released. 17605 lines.
 * v0.7, 2013-12-01, support dead-loop detect for forwarder and transcoder.
 * v0.7, 2013-12-01, support all ffmpeg filters and params.

@@ -10,6 +10,10 @@ chunk_size          65000;
 # if enabled ffmpeg, each stracoding stream will create a log file.
 # default: ./objs/logs
 log_dir             ./objs/logs;
+# the max connections.
+# if exceed the max connections, server will drop the new connection.
+# default: 2000
+max_connections     2000;
 # vhost list, the __defaultVhost__ is the default vhost
 # for which cannot identify the required vhost.
 # for default demo.

@@ -916,6 +916,18 @@ std::string SrsConfig::get_log_dir()
 	return conf->arg0();
 }
 
+int SrsConfig::get_max_connections()
+{
+	srs_assert(root);
+	
+	SrsConfDirective* conf = root->get("max_connections");
+	if (!conf || conf->arg0().empty()) {
+		return 2000;
+	}
+	
+	return ::atoi(conf->arg0().c_str());
+}
+
 SrsConfDirective* SrsConfig::get_gop_cache(std::string vhost)
 {
 	SrsConfDirective* conf = get_vhost(vhost);

@@ -141,6 +141,7 @@ public:
 	virtual void			  get_engine_aparams(SrsConfDirective* engine, std::vector<std::string>& aparams);
 	virtual std::string 	  get_engine_output(SrsConfDirective* engine);
 	virtual std::string 	  get_log_dir();
+	virtual int			 	  get_max_connections();
 	virtual SrsConfDirective* get_gop_cache(std::string vhost);
 	virtual SrsConfDirective* get_forward(std::string vhost);
 	virtual SrsConfDirective* get_hls(std::string vhost);

@@ -305,6 +305,19 @@ int SrsServer::accept_client(SrsListenerType type, st_netfd_t client_stfd)
 {
 	int ret = ERROR_SUCCESS;
 	
+	int max_connections = config->get_max_connections();
+	if ((int)conns.size() >= max_connections) {
+		int fd = st_netfd_fileno(client_stfd);
+		
+		srs_error("exceed the max connections, drop client: "
+			"clients=%d, max=%d, fd=%d", (int)conns.size(), max_connections, fd);
+			
+		st_netfd_close(client_stfd);
+		::close(fd);
+		
+		return ret;
+	}
+	
 	SrsConnection* conn = NULL;
 	if (type == SrsListenerStream) {
 		conn = new SrsClient(this, client_stfd);