for #319, refine the config forward.

@@ -44,7 +44,10 @@ vhost demo.srs.com {
     enabled         on;
     gop_cache       on;
     queue_length    30;
-    forward         127.0.0.1:19350;
+    forward {
+        enabled on;
+        destination 127.0.0.1:19350;
+    }
     bandcheck {
         enabled         off;
     }

@@ -8,5 +8,8 @@ pid                 ./objs/srs.master.pid;
 srs_log_tank        file;
 srs_log_file        ./objs/srs.master.log;
 vhost __defaultVhost__ {
-    forward         127.0.0.1:19350;
+    forward {
+        enabled on;
+        destination 127.0.0.1:19350;
+    }
 }

@@ -268,33 +268,6 @@ vhost removed.srs.com {
     # @see scope.vhost.srs.com
     enabled         off;
 }
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 # the vhost for antisuck.
 vhost refer.anti_suck.com {
     # refer hotlink-denial.
@@ -534,13 +507,47 @@ vhost stream.control.com {
 
 # the vhost which forward publish streams.
 vhost same.vhost.forward.srs.com {
-    # forward all publish stream to the specified server.
-    # this used to split/forward the current stream for cluster active-standby,
-    # active-active for cdn to build high available fault tolerance system.
-    # format: {ip}:{port} {ip_N}:{port_N}
-    forward         127.0.0.1:1936 127.0.0.1:1937;
+    # forward stream to other servers.
+    forward {
+        # whether enable the forward.
+        # default: off
+        enabled on;
+        # forward all publish stream to the specified server.
+        # this used to split/forward the current stream for cluster active-standby,
+        # active-active for cdn to build high available fault tolerance system.
+        # format: {ip}:{port} {ip_N}:{port_N}
+        destination 127.0.0.1:1936 127.0.0.1:1937;
+    }
 }
 
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 # the vhost for exec, fork process when publish stream.
 vhost exec.srs.com {
     # the exec used to fork process when got some event.

@@ -62,8 +62,8 @@ vhost vhost.srs.com {
         debug_srs_upnode off;
     }
     
-    # TODO
     forward {
+        enabled off;
         destination 127.0.0.1:1936 127.0.0.1:1937;
     }
     

@@ -1575,7 +1575,7 @@ int SrsConfig::global_to_json(SrsAmf0Object* obj)
         sobj->set("exec", SrsAmf0Any::boolean(get_exec_enabled(dir->name)));
         sobj->set("bandcheck", SrsAmf0Any::boolean(get_bw_check_enabled(dir->name)));
         sobj->set("origin", SrsAmf0Any::boolean(!get_vhost_is_edge(dir->name)));
-        sobj->set("forward", SrsAmf0Any::boolean(get_forward(dir->name)));
+        sobj->set("forward", SrsAmf0Any::boolean(get_forward_enabled(dir->name)));
         
         sobj->set("security", SrsAmf0Any::boolean(get_security_enabled(dir->name)));
         sobj->set("refer", SrsAmf0Any::boolean(get_refer_enabled(dir->name)));
@@ -1679,7 +1679,18 @@ int SrsConfig::vhost_to_json(SrsConfDirective* vhost, SrsAmf0Object* obj)
     
     // forward
     if ((dir = vhost->get("forward")) != NULL) {
-        obj->set("forward", dir->dumps_args());
+        SrsAmf0Object* forward = SrsAmf0Any::object();
+        obj->set("forward", forward);
+        
+        for (int i = 0; i < (int)dir->directives.size(); i++) {
+            SrsConfDirective* sdir = dir->directives.at(i);
+            
+            if (sdir->name == "enabled") {
+                forward->set("enabled", sdir->dumps_arg0_to_boolean());
+            } else if (sdir->name == "destination") {
+                forward->set("destination", sdir->dumps_args());
+            }
+        }
     }
     
     // debug_srs_upnode
@@ -2705,15 +2716,14 @@ int SrsConfig::check_config()
                     }
                 }
             } else if (n == "forward") {
-                // TODO: FIXME: implements it.
-                /*for (int j = 0; j < (int)conf->directives.size(); j++) {
+                for (int j = 0; j < (int)conf->directives.size(); j++) {
                     string m = conf->at(j)->name.c_str();
-                    if (m != "enabled" && m != "vhost" && m != "refer") {
+                    if (m != "enabled" && m != "destination") {
                         ret = ERROR_SYSTEM_CONFIG_INVALID;
                         srs_error("unsupported vhost forward directive %s, ret=%d", m.c_str(), ret);
                         return ret;
                     }
-                }*/
+                }
             } else if (n == "security") {
                 for (int j = 0; j < (int)conf->directives.size(); j++) {
                     SrsConfDirective* security = conf->at(j);
@@ -3581,14 +3591,41 @@ int SrsConfig::get_global_chunk_size()
     return ::atoi(conf->arg0().c_str());
 }
 
-SrsConfDirective* SrsConfig::get_forward(string vhost)
+bool SrsConfig::get_forward_enabled(string vhost)
 {
+    static bool DEFAULT = false;
+    
     SrsConfDirective* conf = get_vhost(vhost);
     if (!conf) {
+        return DEFAULT;
+    }
+    
+    conf = conf->get("forward");
+    if (!conf) {
+        return DEFAULT;
+    }
+    
+    conf = conf->get("enabled");
+    if (!conf || conf->arg0().empty()) {
+        return DEFAULT;
+    }
+    
+    return SRS_CONF_PERFER_FALSE(conf->arg0());
+}
+
+SrsConfDirective* SrsConfig::get_forwards(string vhost)
+{
+    SrsConfDirective* conf = get_vhost(vhost);
+    if (!conf) {
+        return NULL;
+    }
+    
+    conf = conf->get("forward");
+    if (!conf) {
         return NULL;
     }
     
-    return conf->get("forward");
+    return conf->get("destination");
 }
 
 SrsConfDirective* SrsConfig::get_vhost_http_hooks(string vhost)
@@ -5774,6 +5811,22 @@ int srs_config_transform_vhost(SrsConfDirective* root)
                 continue;
             }
             
+            // SRS3.0, change the forward.
+            //  SRS1/2:
+            //      vhost { forward; }
+            //  SRS3+:
+            //      vhost { forward { enabled; destination; } }
+            if (n == "forward") {
+                conf->get_or_create("enabled", "on");
+                
+                SrsConfDirective* destination = conf->get_or_create("destination");
+                destination->args = conf->args;
+                conf->args.clear();
+                
+                ++it;
+                continue;
+            }
+            
             ++it;
         }
     }

@@ -599,9 +599,13 @@ private:
 // forward section
 public:
     /**
+     * whether the forwarder enabled.
+     */
+    virtual bool                get_forward_enabled(std::string vhost);
+    /**
     * get the forward directive of vhost.
     */
-    virtual SrsConfDirective*   get_forward(std::string vhost);
+    virtual SrsConfDirective*   get_forwards(std::string vhost);
 // http_hooks section
 private:
     /**

@@ -2235,7 +2235,11 @@ int SrsSource::create_forwarders()
 {
     int ret = ERROR_SUCCESS;
     
-    SrsConfDirective* conf = _srs_config->get_forward(_req->vhost);
+    if (_srs_config->get_forward_enabled(_req->vhost)) {
+        return ret;
+    }
+    
+    SrsConfDirective* conf = _srs_config->get_forwards(_req->vhost);
     for (int i = 0; conf && i < (int)conf->args.size(); i++) {
         std::string forward_server = conf->args.at(i);