move to async/await instead of promises

Add in handleModify
Add a dockerfile with multistage build
Add in outbound mode option

Author: danjenkins

Dockerfile

@@ -0,0 +1,13 @@
+FROM node:10.16.3 AS build-env
+
+WORKDIR /app
+COPY package.json /app/
+COPY package-lock.json /app/
+RUN npm install --production
+COPY . /app
+
+FROM gcr.io/distroless/nodejs
+EXPOSE 9022
+COPY --from=build-env /app /app
+WORKDIR /app
+CMD ["app.js"]

app.js

@@ -13,13 +13,17 @@ const config = require('config') ;
 const Client = require('rtpengine-client').Client ;
 const rtpengine = new Client(config.get('rtpengine.local-port'));
 
-srf.connect(config.get('drachtio'))
+if (config.get('drachtio.mode') === 'outbound') {
+  srf.listen(config.get('drachtio'))
+} else {
+  srf.connect(config.get('drachtio'))
   .on('connect', (err, hostport) => {
     console.log(`connected to drachtio listening for SIP on hostport ${hostport}`) ;
   })
   .on('error', (err) => {
     console.error(`Error connecting to drachtio server: ${err.message}`) ;
   });
+}
 
 register.start(srf, registrar);
 subscriber.start(srf, registrar);

config/default.json.example

@@ -1,9 +1,10 @@
 {
   "drachtio": {
+    "mode": "inbound",
     "host": "127.0.0.1",
     "port": 9022,
     "secret": "cymru"
-  }, 
+  },
   "rtpengine": {
     "host": "127.0.0.1",
     "port": 22222,
@@ -14,7 +15,7 @@
       "trunk": "your.voipprovider.com",
       "auth": {
         "username": "<yourusername>",
-        "password": "<yourpassword>"  
+        "password": "<yourpassword>"
       }
     }
   ]