data channel between host + client, sending/receiving ice candidates when needed...

[henge/kiak.git] / client.js

diff --git a/client.js b/client.js
index 676861a..1f62625 100644 (file)
--- a/client.js
+++ b/client.js
@@ -4,13 +4,13 @@ document.title = "Strapp.io Client"
 body.appendChild(root)
 document.body = body
 const conf = {"iceServers": [{ "urls": "stun:stun.1.google.com:19302" }] }
+let dataChannel
 
 /* TODO: duplicate in both client.js and host.js */
 function getPublicKey() {
   return new Promise( (resolve, reject) => {
     /* Check local storage for public key */
     if (!window.localStorage.getItem('public-key')) {
-      console.log('public key is undefined')
       /* If doesn't exist, generate public and private key pair, store in
       local storage */
       crypto.subtle.generateKey(
@@ -47,7 +47,8 @@ function postServer(url, data) {
   request.send(data)
 }
 
-/* TODO: All this does is wrap a function in a promise */
+/* TODO: All this does is wrap a function in a promise. Allows pollServerForAnswer
+         to call itself recursively with the same promise */
 function pollServer(url, clientPubKey, func) {
   return new Promise((resolve, reject) => {
     func(url, clientPubKey, resolve, reject )
@@ -66,14 +67,14 @@ function pollServerForAnswer(url, data, resolve, reject) {
   request.onreadystatechange = () => {
     if (request.status === 200) {
       if(request.readyState === 4) {
-        console.log('Client: Recieved response from Host')
+        console.log('Client: Recieved Answer from Host')
         console.log(request)
         resolve(request.response)
       }
     }
     else if (request.status === 504) {
       console.log('timed out, resending')
-      pollServerTimeout(url, data, resolve, reject)
+      pollServerForAnswer(url, data, resolve, reject)
     }
     else {
       reject('server unhandled response of status ' + request.status)
@@ -83,67 +84,61 @@ function pollServerForAnswer(url, data, resolve, reject) {
 }
 
 /* Poll server for ice candidates until ice is complete */
-function pollServerForICECandidate(cpc) {
-  window.setInterval(() => {
-    if (cpc.iceGatheringState.localeCompare('complete') !== 0) {
-      return new Promise((resolve, reject) => {
+function pollServerForICECandidate(cpc, url, pubKey) {
+  let intervalID = window.setInterval(() => {
+    if (cpc.iceConnectionState.localeCompare('connected') !== 0
+      && cpc.iceConnectionState.localeCompare('completed') !== 0) {
+        console.log('Client: Polling server begin for intervalID = ' + intervalID)
          console.log('Client: Requesting ICE Candidates from server')
          const request = new XMLHttpRequest()
-         request.open('GET', window.location, true)
+         request.open('GET', url, true)
          request.setRequestHeader('Content-Type', 'application/json' )
          request.setRequestHeader('X-Strapp-Type', 'ice-candidate-request')
+         request.setRequestHeader('X-client-pubkey', pubKey)
          request.onreadystatechange = () => {
            if (request.status === 200) {
              if(request.readyState === 4) {
                console.log('Client: Recieved ICE Candidate from Host')
-               resolve(request.response)
+               cpc.addIceCandidate(new RTCIceCandidate(JSON.parse(request.response).ice))
              }
            }
            else if (request.status === 204) {
              console.log('Ice Candidate unavailable, trying again in one second')
            }
            else {
-             reject('server unhandled response of status ' + request.status)
+             console.log('server unhandled response of status ' + request.status)
+             clearInterval(intervalID)
            }
          }
-         request.send(cpc.pubKey)
-      }).then((response) => {
-        console.log('Client: Adding Ice Candidate ')
-        cpc.addIceCandidate(response.candidate)
-      }).catch((err) => {
-        console.log('pollServerForICECandidate: ' + err)
-      })
+         request.send()
     }
     else {
       clearTimeout()
+      clearInterval(intervalID)
     }
-  }, 2000)
+  }, 5000)
 }
 
-/* Create, set, and get client Offer. Poll server for host answer.
-   Set host answer as client remoteDescription */
+/* Create and send offer -> Send ICE Candidates -> Poll for ICE Candidates */
 getPublicKey().then((cpk) => {
+  console.log('Client: Create and send offer')
   const cpc = new RTCPeerConnection(conf)
   /* Start data channel */
-  sendChannel = cpc.createDataChannel("sendChannel");
-  sendChannel.onopen = () => {
-    console.log('client data channel on line')
-    sendChannel.onmessage = (message) => {
-      console.log(message.data)
-    }
-    sendChannel.send('Hi from the Client')
-  };
-  /* Start polling for ice candidate */
+  dataChannel = cpc.createDataChannel("sendChannel");
+  dataChannel.onmessage = (msg) => {
+    console.log(msg.data)
+  }
+  dataChannel.onopen = () => {
+    dataChannel.send(`Hi from the Client`)
+  }
 
 
-  console.log(cpc.iceConnectionState)
   cpc.oniceconnectionstatechange = () => {
     console.log('iceConnectionState = ' + cpc.iceConnectionState)
   }
 
-
-
   cpc.onnegotiationneeded = () => {
+    console.log('negotiation needed!')
     cpc.createOffer().then((offer) => {
       return cpc.setLocalDescription(offer)
     })
@@ -157,11 +152,9 @@ getPublicKey().then((cpk) => {
       return pollServer(window.location, offer, pollServerForAnswer)
     }).then((serverResponse) => {
       const answer = JSON.parse(serverResponse)
-      console.log('Client: received host answer')
-      cpc.setRemoteDescription(answer.sdp).then(() => {
-        console.log('Client: Polling for ICE candidates')
-        pollServerForICECandidate(cpc)
-      })
+      console.log('Client: Polling for ICE candidates')
+      pollServerForICECandidate(cpc, window.location, cpk.n)
+      cpc.setRemoteDescription(answer.sdp)
       cpc.onicecandidate = (event) => {
         if (event.candidate) {
           console.log('Client: Sending ice candidate to host')
@@ -175,6 +168,8 @@ getPublicKey().then((cpk) => {
           console.log('Client: No more Ice Candidates to send')
         }
       }
+
+
     }).catch( (err) => {
       console.log('error in sdp handshake: ' + err)
     })