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Merge pull request #3510 from cwillisf/scratch-link-ws
support Scratch Link on ws://127.0.0.1:20111
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commit
5ff017cbe2
1 changed files with 56 additions and 7 deletions
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@ -23,26 +23,75 @@ class ScratchLinkWebSocket {
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}
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open () {
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if (!(this._onOpen && this._onClose && this._onError && this._handleMessage)) {
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throw new Error('Must set open, close, message and error handlers before calling open on the socket');
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}
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let pathname;
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switch (this._type) {
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case 'BLE':
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this._ws = new WebSocket('wss://device-manager.scratch.mit.edu:20110/scratch/ble');
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pathname = 'scratch/ble';
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break;
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case 'BT':
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this._ws = new WebSocket('wss://device-manager.scratch.mit.edu:20110/scratch/bt');
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pathname = 'scratch/bt';
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break;
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default:
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throw new Error(`Unknown ScratchLink socket Type: ${this._type}`);
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}
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if (this._onOpen && this._onClose && this._onError && this._handleMessage) {
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// Try ws:// (the new way) and wss:// (the old way) simultaneously. If either connects, close the other. If we
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// were to try one and fall back to the other on failure, that could mean a delay of 30 seconds or more for
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// those who need the fallback.
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// If both connections fail we should report only one error.
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const setSocket = (socketToUse, socketToClose) => {
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socketToClose.onopen = socketToClose.onerror = null;
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socketToClose.close();
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this._ws = socketToUse;
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this._ws.onopen = this._onOpen;
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this._ws.onclose = this._onClose;
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this._ws.onerror = this._onError;
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} else {
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throw new Error('Must set open, close, message and error handlers before calling open on the socket');
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}
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this._ws.onmessage = this._onMessage.bind(this);
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};
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const ws = new WebSocket(`ws://127.0.0.1:20111/${pathname}`);
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const wss = new WebSocket(`wss://device-manager.scratch.mit.edu:20110/${pathname}`);
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const connectTimeout = setTimeout(() => {
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// neither socket succeeded before the timeout
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setSocket(ws, wss);
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this._ws.onerror(new Event('timeout'));
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}, 15 * 1000);
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ws.onopen = openEvent => {
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clearTimeout(connectTimeout);
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setSocket(ws, wss);
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this._ws.onopen(openEvent);
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};
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wss.onopen = openEvent => {
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clearTimeout(connectTimeout);
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setSocket(wss, ws);
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this._ws.onopen(openEvent);
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};
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let wsError;
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let wssError;
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const errorHandler = () => {
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// if only one has received an error, we haven't overall failed yet
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if (wsError && wssError) {
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clearTimeout(connectTimeout);
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setSocket(ws, wss);
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this._ws.onerror(wsError);
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}
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};
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ws.onerror = errorEvent => {
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wsError = errorEvent;
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errorHandler();
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};
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wss.onerror = errorEvent => {
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wssError = errorEvent;
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errorHandler();
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};
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}
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close () {
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