implements basic edge(play and publish), with bug

@@ -166,7 +166,7 @@ int SrsEdgeIngester::ingest()
         // read from client.
         SrsCommonMessage* msg = NULL;
         if ((ret = client->recv_message(&msg)) != ERROR_SUCCESS) {
-            srs_error("recv origin server message failed. ret=%d", ret);
+            srs_error("ingest recv origin server message failed. ret=%d", ret);
             return ret;
         }
         srs_verbose("edge loop recv message. ret=%d", ret);
@@ -312,10 +312,13 @@ SrsEdgeProxyContext::SrsEdgeProxyContext()
     edge_stream_id = 0;
     edge_io = NULL;
     edge_rtmp = NULL;
+    edge_stfd = NULL;
+    edge_got_message = false;
     
     origin_stream_id = 0;
     origin_io = NULL;
     origin_rtmp = NULL;
+    origin_stfd = NULL;
 }
 
 SrsEdgeProxyContext::~SrsEdgeProxyContext()
@@ -400,10 +403,21 @@ int SrsEdgeForwarder::proxy(SrsEdgeProxyContext* context)
     context->origin_io = io;
     context->origin_rtmp = client;
     context->origin_stream_id = stream_id;
+    context->origin_stfd = stfd;
     
-    client->set_recv_timeout(SRS_PULSE_TIMEOUT_US);
+    context->origin_rtmp->set_recv_timeout(SRS_RECV_TIMEOUT_US);
+    context->edge_rtmp->set_recv_timeout(SRS_RECV_TIMEOUT_US);
+    
+    context->edge_got_message = false;
     
     SrsPithyPrint pithy_print(SRS_STAGE_EDGE);
+    
+    pollfd fds[2];
+    fds[0].fd = st_netfd_fileno(context->edge_stfd);
+    fds[0].events = POLLIN;
+    
+    fds[1].fd = st_netfd_fileno(context->origin_stfd);
+    fds[1].events = POLLIN;
 
     while (true) {
         // switch to other st-threads.
@@ -417,58 +431,101 @@ int SrsEdgeForwarder::proxy(SrsEdgeProxyContext* context)
                 pithy_print.age(), client->get_send_bytes(), client->get_recv_bytes(), client->get_send_kbps(), client->get_recv_kbps());
         }
         
-        if ((ret = proxy_message(context)) != ERROR_SUCCESS) {
+        fds[0].revents = 0;
+        fds[1].revents = 0;
+        
+        // Upon successful completion, a non-negative value is returned. 
+        // A positive value indicates the total number of OS file descriptors in pds that have events. 
+        // A value of 0 indicates that the call timed out. 
+        // Upon failure, a value of -1 is returned and errno is set to indicate the error
+        if(st_poll(fds, 2, ST_UTIME_NO_TIMEOUT) <= 0){
+            ret = ERROR_RTMP_EDGE_PROXY_PULL;
+            srs_error("edge wait for st_poll error. ret=%d", ret);
             return ret;
         }
+        
+        // edge active
+        if(fds[0].revents & POLLIN){
+            if((ret = proxy_edge_message(context)) != ERROR_SUCCESS){
+                return ret;
+            }
+        }
+        
+        // origin active
+        if(fds[1].revents & POLLIN){
+            if((ret = proxy_origin_message(context)) != ERROR_SUCCESS){
+                return ret;
+            }
+        }
     }
     
     return ret;
 }
 
-int SrsEdgeForwarder::proxy_message(SrsEdgeProxyContext* context)
+int SrsEdgeForwarder::proxy_origin_message(SrsEdgeProxyContext* context)
 {
     int ret = ERROR_SUCCESS;
 
     SrsCommonMessage* msg = NULL;
     
-    // proxy origin message to client
-    msg = NULL;
+    // process origin message.
     ret = context->origin_rtmp->recv_message(&msg);
     if (ret != ERROR_SUCCESS && ret != ERROR_SOCKET_TIMEOUT) {
-        srs_error("recv origin server message failed. ret=%d", ret);
+        srs_error("forward recv origin server message failed. ret=%d", ret);
         return ret;
     }
     
-    if (msg) {
-        if (msg->size <= 0) {
-            srs_freep(msg);
-        } else {
-            msg->header.stream_id = context->edge_stream_id;
-            if ((ret = context->edge_rtmp->send_message(msg)) != ERROR_SUCCESS) {
-                srs_error("send origin message to client failed. ret=%d", ret);
-                return ret;
-            }
-        }
+    srs_assert(msg);
+    
+    if (msg->size <= 0 
+        || !context->edge_got_message
+        || msg->header.is_set_chunk_size()
+        || msg->header.is_window_ackledgement_size()
+        || msg->header.is_ackledgement()
+    ) {
+        srs_freep(msg);
+        return ret;
     }
     
+    msg->header.stream_id = context->edge_stream_id;
+    if ((ret = context->edge_rtmp->send_message(msg)) != ERROR_SUCCESS) {
+        srs_error("send origin message to client failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsEdgeForwarder::proxy_edge_message(SrsEdgeProxyContext* context)
+{
+    int ret = ERROR_SUCCESS;
+
+    SrsCommonMessage* msg = NULL;
+    
     // proxy client message to origin
-    msg = NULL;
     ret = context->edge_rtmp->recv_message(&msg);
     if (ret != ERROR_SUCCESS && ret != ERROR_SOCKET_TIMEOUT) {
         srs_error("recv client message failed. ret=%d", ret);
         return ret;
     }
     
-    if (msg) {
-        if (msg->size <= 0) {
-            srs_freep(msg);
-        } else {
-            msg->header.stream_id = context->origin_stream_id;
-            if ((ret = context->origin_rtmp->send_message(msg)) != ERROR_SUCCESS) {
-                srs_error("send client message to origin failed. ret=%d", ret);
-                return ret;
-            }
-        }
+    srs_assert(msg);
+    
+    context->edge_got_message = true;
+    
+    if (msg->size <= 0 
+        || msg->header.is_set_chunk_size()
+        || msg->header.is_window_ackledgement_size()
+        || msg->header.is_ackledgement()
+    ) {
+        srs_freep(msg);
+        return ret;
+    }
+    
+    msg->header.stream_id = context->origin_stream_id;
+    if ((ret = context->origin_rtmp->send_message(msg)) != ERROR_SUCCESS) {
+        srs_error("send client message to origin failed. ret=%d", ret);
+        return ret;
     }
     
     return ret;

@@ -105,10 +105,13 @@ class SrsEdgeProxyContext
 {
 public:
     int edge_stream_id;
+    st_netfd_t edge_stfd;
     ISrsProtocolReaderWriter* edge_io;
     SrsRtmpServer* edge_rtmp;
+    bool edge_got_message;
 public:
     int origin_stream_id;
+    st_netfd_t origin_stfd;
     ISrsProtocolReaderWriter* origin_io;
     SrsRtmpClient* origin_rtmp;
 public:
@@ -141,7 +144,8 @@ public:
 public:
     virtual int proxy(SrsEdgeProxyContext* context);
 private:
-    virtual int proxy_message(SrsEdgeProxyContext* context);
+    virtual int proxy_origin_message(SrsEdgeProxyContext* context);
+    virtual int proxy_edge_message(SrsEdgeProxyContext* context);
     virtual void close_underlayer_socket();
     virtual int connect_server();
 };

@@ -277,17 +277,21 @@ int SrsRtmpConn::stream_service_cycle()
     }
     srs_assert(source != NULL);
     
-    // check publish available.
-    if (type != SrsRtmpConnPlay && !source->can_publish()) {
-        ret = ERROR_SYSTEM_STREAM_BUSY;
-        srs_warn("stream %s is already publishing. ret=%d", 
-            req->get_stream_url().c_str(), ret);
-        // to delay request
-        st_usleep(SRS_STREAM_BUSY_SLEEP_US);
-        return ret;
+    bool vhost_is_edge = _srs_config->get_vhost_is_edge(req->vhost);
+    
+    // check publish available
+    // for edge, never check it, for edge use proxy mode.
+    if (!vhost_is_edge) {
+        if (type != SrsRtmpConnPlay && !source->can_publish()) {
+            ret = ERROR_SYSTEM_STREAM_BUSY;
+            srs_warn("stream %s is already publishing. ret=%d", 
+                req->get_stream_url().c_str(), ret);
+            // to delay request
+            st_usleep(SRS_STREAM_BUSY_SLEEP_US);
+            return ret;
+        }
     }
     
-    bool vhost_is_edge = _srs_config->get_vhost_is_edge(req->vhost);
     bool enabled_cache = _srs_config->get_gop_cache(req->vhost);
     srs_trace("source found, url=%s, enabled_cache=%d, edge=%d", 
         req->get_stream_url().c_str(), enabled_cache, vhost_is_edge);
@@ -338,6 +342,7 @@ int SrsRtmpConn::stream_service_cycle()
             context.edge_io = skt;
             context.edge_stream_id = res->stream_id;
             context.edge_rtmp = rtmp;
+            context.edge_stfd = stfd;
             if (vhost_is_edge) {
                 return source->on_edge_proxy_publish(&context);
             }
@@ -371,6 +376,7 @@ int SrsRtmpConn::stream_service_cycle()
             context.edge_io = skt;
             context.edge_stream_id = res->stream_id;
             context.edge_rtmp = rtmp;
+            context.edge_stfd = stfd;
             if (vhost_is_edge) {
                 return source->on_edge_proxy_publish(&context);
             }

@@ -81,6 +81,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_RTMP_EDGE_PLAY_STATE          320
 // invalid state for client to publish edge stream.
 #define ERROR_RTMP_EDGE_PUBLISH_STATE       321
+#define ERROR_RTMP_EDGE_PROXY_PULL          322
 
 #define ERROR_SYSTEM_STREAM_INIT            400
 #define ERROR_SYSTEM_PACKET_INVALID         401

@@ -1202,6 +1202,11 @@ bool SrsMessageHeader::is_window_ackledgement_size()
     return message_type == RTMP_MSG_WindowAcknowledgementSize;
 }
 
+bool SrsMessageHeader::is_ackledgement()
+{
+    return message_type == RTMP_MSG_Acknowledgement;
+}
+
 bool SrsMessageHeader::is_set_chunk_size()
 {
     return message_type == RTMP_MSG_SetChunkSize;

@@ -236,6 +236,7 @@ struct SrsMessageHeader
     bool is_amf3_command();
     bool is_amf3_data();
     bool is_window_ackledgement_size();
+    bool is_ackledgement();
     bool is_set_chunk_size();
     bool is_user_control_message();