refine code:优化edge模式回源播放线程启动流程

@@ -1210,15 +1210,6 @@ int SrsHttpStreamServer::hijack(ISrsHttpMessage* request, ISrsHttpHandler** ph)
     srs_trace("hstrs: source url=%s, is_edge=%d, source_id=%d[%d]",
         r->get_stream_url().c_str(), vhost_is_edge, s->source_id(), s->source_id());
     
-    // TODO: FIXME: disconnect when all connection closed.
-    if (vhost_is_edge) {
-        // notice edge to start for the first client.
-        if ((ret = s->on_edge_start_play()) != ERROR_SUCCESS) {
-            srs_error("notice edge start play stream failed. ret=%d", ret);
-            return ret;
-        }
-    }
-    
     return ret;
 }
 

@@ -537,14 +537,6 @@ int SrsRtmpConn::playing(SrsSource* source)
     SrsAutoFree(SrsConsumer, consumer);
     srs_verbose("consumer created success.");
 
-    if (_srs_config->get_vhost_is_edge(req->vhost)) {
-        // notice edge to start for the first client.
-        if ((ret = source->on_edge_start_play()) != ERROR_SUCCESS) {
-            srs_error("notice edge start play stream failed. ret=%d", ret);
-            return ret;
-        }
-    }
-    
     // use isolate thread to recv, 
     // @see: https://github.com/simple-rtmp-server/srs/issues/217
     SrsQueueRecvThread trd(consumer, rtmp, SRS_PERF_MW_SLEEP);
@@ -835,7 +827,6 @@ int SrsRtmpConn::acquire_publish(SrsSource* source, bool is_edge)
         if ((ret = source->on_edge_start_publish()) != ERROR_SUCCESS) {
             srs_error("notice edge start publish stream failed. ret=%d", ret);
         }        
-        return ret;
     } else {
         if ((ret = source->on_publish()) != ERROR_SUCCESS) {
             srs_error("notify publish failed. ret=%d", ret);

@@ -765,7 +765,7 @@ SrsSource* SrsSource::fetch(SrsRequest* r)
 SrsSource* SrsSource::fetch(std::string vhost, std::string app, std::string stream)
 {
     SrsSource* source = NULL;
-	string stream_url = srs_generate_stream_url(vhost, app, stream);
+    string stream_url = srs_generate_stream_url(vhost, app, stream);
     
     if (pool.find(stream_url) == pool.end()) {
         return NULL;
@@ -2135,6 +2135,15 @@ int SrsSource::create_consumer(SrsConsumer*& consumer, bool ds, bool dm, bool dg
     } else {
         srs_trace("create consumer, ignore gop cache, jitter=%d", jitter_algorithm);
     }
+
+    // for edge, when play edge stream, check the state
+    if (_srs_config->get_vhost_is_edge(_req->vhost)) {
+        // notice edge to start for the first client.
+        if ((ret = play_edge->on_client_play()) != ERROR_SUCCESS) {
+            srs_error("notice edge start play stream failed. ret=%d", ret);
+            return ret;
+        }
+    }
     
     return ret;
 }
@@ -2163,11 +2172,6 @@ SrsRtmpJitterAlgorithm SrsSource::jitter()
     return jitter_algorithm;
 }
 
-int SrsSource::on_edge_start_play()
-{
-    return play_edge->on_client_play();
-}
-
 int SrsSource::on_edge_start_publish()
 {
     return publish_edge->on_client_publish();

@@ -574,8 +574,6 @@ public:
     virtual SrsRtmpJitterAlgorithm jitter();
 // internal
 public:
-    // for edge, when play edge stream, check the state
-    virtual int on_edge_start_play();
     // for edge, when publish edge stream, check the state
     virtual int on_edge_start_publish();
     // for edge, proxy the publish