support forward between two origin,to make a full backup of top server

@@ -77,6 +77,57 @@ SrsForwarder::~SrsForwarder()
     srs_freep(sh_audio);
 }
 
+int SrsForwarder::check_dead_loop(SrsRequest* req, std::string ep_forward)
+{
+	int ret = ERROR_SUCCESS;
+	std::string server, port, tc_url;
+
+	server = ep_forward;
+	port = SRS_CONSTS_RTMP_DEFAULT_PORT;
+
+	// TODO: FIXME: parse complex params
+	size_t pos = ep_forward.find(":");
+	if (pos != std::string::npos) {
+		port = ep_forward.substr(pos + 1);
+		server = ep_forward.substr(0, pos);
+	}
+
+	// generate tcUrl
+	tc_url = srs_generate_tc_url(server, req->vhost, req->app, port, req->param);
+
+	// dead loop check
+	std::string source_ep = "rtmp://";
+	source_ep += req->host;
+	source_ep += ":";
+	source_ep += req->port;
+	source_ep += "?vhost=";
+	source_ep += req->vhost;
+
+	std::string dest_ep = "rtmp://";
+	if (ep_forward == SRS_CONSTS_LOCALHOST) {
+		dest_ep += req->host;
+	}
+	else {
+		dest_ep += server;
+	}
+	dest_ep += ":";
+	dest_ep += port;
+	dest_ep += "?vhost=";
+	dest_ep += req->vhost;
+
+	if (source_ep == dest_ep) {
+		ret = ERROR_SYSTEM_FORWARD_LOOP;
+		srs_warn("forward loop detected. src=%s, dest=%s, ret=%d",
+			source_ep.c_str(), dest_ep.c_str(), ret);
+		return ret;
+	}
+	srs_trace("start forward %s to %s, tcUrl=%s, stream=%s",
+		source_ep.c_str(), dest_ep.c_str(), tc_url.c_str(),
+		req->stream.c_str());
+
+	return ret;
+}
+
 int SrsForwarder::initialize(SrsRequest* req, string ep_forward)
 {
     int ret = ERROR_SUCCESS;
@@ -99,7 +150,7 @@ void SrsForwarder::set_queue_size(double queue_size)
 int SrsForwarder::on_publish()
 {
     int ret = ERROR_SUCCESS;
-    
+#if 0 
     SrsRequest* req = _req;
     
     // discovery the server port and tcUrl from req and ep_forward.
@@ -134,7 +185,7 @@ int SrsForwarder::on_publish()
     srs_trace("start forward %s to %s, tcUrl=%s, stream=%s", 
         source_ep.c_str(), dest_ep.c_str(), tc_url.c_str(), 
         req->stream.c_str());
-    
+#endif    
     if ((ret = pthread->start()) != ERROR_SUCCESS) {
         srs_error("start srs thread failed. ret=%d", ret);
         return ret;

@@ -75,6 +75,7 @@ public:
     SrsForwarder(SrsSource* _source);
     virtual ~SrsForwarder();
 public:
+    static  int check_dead_loop(SrsRequest* req, std::string ep_forward);
     virtual int initialize(SrsRequest* req, std::string ep_forward);
     virtual void set_queue_size(double queue_size);
 public:

@@ -2427,6 +2427,10 @@ int SrsSource::create_forwarders()
     SrsConfDirective* conf = _srs_config->get_forward(_req->vhost);
     for (int i = 0; conf && i < (int)conf->args.size(); i++) {
         std::string forward_server = conf->args.at(i);
+
+	if (SrsForwarder::check_dead_loop(_req, forward_server)) {
+		continue;
+	}
         
         SrsForwarder* forwarder = new SrsForwarder(this);
         forwarders.push_back(forwarder);
@@ -2459,31 +2463,39 @@ int SrsSource::create_forwarders()
     if(servers_size <= 0){
     	return ret;
     }
+  
+    for(int i = 0; i < servers_size; i++){
 
-    if(server_index >= servers_size){
-    	server_index = 0;
-    }
+    	if(server_index >= servers_size){
+    		server_index = 0;
+    	}
 
-    std::string forward_server = conf->args.at(server_index);
-    server_index ++;
+    	std::string forward_server = conf->args.at(server_index);
+    	server_index ++;
 
-    SrsForwarder* forwarder = new SrsForwarder(this);
-    forwarders.push_back(forwarder);
+    	if (SrsForwarder::check_dead_loop(_req, forward_server)) {
+		continue;
+    	}
 
-    // initialize the forwarder with request.
-    if ((ret = forwarder->initialize(_req, forward_server)) != ERROR_SUCCESS) {
-        return ret;
-    }
+    	SrsForwarder* forwarder = new SrsForwarder(this);
+    	forwarders.push_back(forwarder);
 
-    double queue_size = _srs_config->get_queue_length(_req->vhost);
-    forwarder->set_queue_size(queue_size);
+    	// initialize the forwarder with request.
+  	  if ((ret = forwarder->initialize(_req, forward_server)) != ERROR_SUCCESS) {
+        	return ret;
+    	}
 
-    if ((ret = forwarder->on_publish()) != ERROR_SUCCESS) {
-            srs_error("start forwarder failed. "
-                "vhost=%s, app=%s, stream=%s, forward-to=%s",
-                _req->vhost.c_str(), _req->app.c_str(), _req->stream.c_str(),
-                forward_server.c_str());
-        return ret;
+    	double queue_size = _srs_config->get_queue_length(_req->vhost);
+    	forwarder->set_queue_size(queue_size);
+
+    	if ((ret = forwarder->on_publish()) != ERROR_SUCCESS) {
+        	    srs_error("start forwarder failed. "
+                	"vhost=%s, app=%s, stream=%s, forward-to=%s",
+                	_req->vhost.c_str(), _req->app.c_str(), _req->stream.c_str(),
+                	forward_server.c_str());
+        	return ret;
+    	}
+    	break;
     }
 
     return ret;

@@ -1764,6 +1764,11 @@ void SrsRequest::update_auth(SrsRequest* req)
     pageUrl = req->pageUrl;
     swfUrl = req->swfUrl;
     tcUrl = req->tcUrl;
+
+    vhost = req->vhost;
+    app = req->app;
+    param = req->param;
+    port = req->port;
     
     if (args) {
         srs_freep(args);