webrtc server creation waiting added, webrtc and app order changed, titles.json removed

src/controller/session.js

@@ -24,18 +24,18 @@ const run_session = async (req, res, next) => {
         return
     }
 
-    var webrtc_pid = await run_webrtc(webrtc_port, app_port)
-    if (!webrtc_pid) {
-        next(new server_error('can not run webrtc'))
-        return
-    }
-
     var app_pid = await run_app(app_path, app_port)
     if (!app_pid) {
         next(new server_error('can not run app'))
         return
     }
 
+    var webrtc_pid = await run_webrtc(webrtc_port, app_port)
+    if (!webrtc_pid) {
+        next(new server_error('can not run webrtc'))
+        return
+    }
+
     var add_runnning_session_result = await database.add_running_session(session_id, app_pid, webrtc_pid)
 
     if(!add_runnning_session_result) {

src/modules/run_process.js

@@ -5,6 +5,10 @@ const webrtc_server_path = config.webrtc_server_path
 const app_args_static = config.app_args.static
 const app_port_arg = config.app_args.runtime.port
 const fs = require('fs')
+const tcp_port_used = require('tcp-port-used')
+
+const webrtc_timeout = 5000
+const webrtc_retry_time = 100
 
 const is_proc_running = (pid) => {
     return is_running(pid)
@@ -37,6 +41,7 @@ const run_webrtc = async (webrtc_port, app_port) => {
         webrtc_proc = fork(webrtc_server_path, [webrtc_proc_arg], {
             detached: true
         })
+        await tcp_port_used.waitUntilUsed(webrtc_port, webrtc_retry_time, webrtc_timeout)
     } catch (err) {
         return null
     }