Keep the connectiov alive when not in use

Otherwise, it times out and causes errors

server.js

@@ -185,6 +185,12 @@ app.ws('/ws/fetch-medium', (ws, req) => {
 app.ws('/ws/push-ghost', (ws, req) => {
   ws.on('message', async(msg) => {
 
+    // respond to keepalive
+    if (msg == '__ping__') {
+      ws.send('__pong__')
+      return
+    }
+
     command = msg.split(' ')
     if (command.length == 3 && command[0] == 'push') {
       const postSlug = command[1]

static/app.js

@@ -6,6 +6,8 @@ function addNotification(msg, className='is-warning') {
   document.getElementById('notifications').appendChild(n)
 }
 
+// Fetching from Medium
+
 function mediumFetch(e) {
   if(e) { e.preventDefault() }
 
@@ -32,12 +34,20 @@ function mediumFetch(e) {
 
   socket.onopen = () => {
     socket.send('fetch ' + postSlug + ' ' + password)
+
+    // keepAlive
+    socket.send('__ping__')
   }
 
   socket.onmessage = m => {
     console.log('Got message: ' + m.data)
 
-    console.log(m.data)
+    // process keepAlive
+    if (m.data == '__pong__') {
+      setTimeout(()=>{socket.send('__ping__')}, 2000)
+      return
+    }
+
     if (m.data.indexOf(': ') != -1) {
       var command = m.data.slice(0, m.data.indexOf(': '))
       var commandData = m.data.slice(m.data.indexOf(': ')+2)
@@ -59,6 +69,7 @@ function mediumFetch(e) {
         // since it's done, clean up
         // remove statusbar
         statusDiv.removeChild(statusText)
+        socket.close()
 
 
         // show buttons, change text and save slug
@@ -79,6 +90,9 @@ function mediumFetch(e) {
   }
 }
 
+
+// Pushing to Ghost
+
 function ghostPush(e) {
   if(e) { e.preventDefault() }
 
@@ -104,12 +118,19 @@ function ghostPush(e) {
 
   socket.onopen = () => {
     socket.send('push ' + postSlug + ' ' + password)
+
+    // keepAlive
+    socket.send('__ping__')
   }
 
   socket.onmessage = m => {
     console.log('Got message: ' + m.data)
 
-    console.log(m.data)
+    // process keepAlive
+    if (m.data == '__pong__') {
+      setTimeout(()=>{socket.send('__ping__')}, 2000)
+      return
+    }
 
     if (m.data.indexOf(': ') != -1) {
       var command = m.data.slice(0, m.data.indexOf(': '))
@@ -132,6 +153,7 @@ function ghostPush(e) {
         // since it's done, clean up
         // remove statusbar
         statusDiv.removeChild(statusText)
+        socket.close()
 
         // show buttons and change text
         for (i=0;i<statusDiv.children.length;i++) {