gazetk / DesktopConnector / DesktopConnector.js @ 908a231e
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var net = require('net'); |
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var ws = require("nodejs-websocket"); |
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var HOST = '127.0.0.1'; |
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var PORT = 6555; |
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var connected = false; |
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var client = new net.Socket(); |
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var connectionManager = [];
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var connectionId = 0; |
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var websocket_server = null; |
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var eyeTracker = ""; |
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if (process.argv.length == 2) { |
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console.log("Start the server with --tracker=smi or --tracker=mygaze or --tracker=eyetribe");
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process.exit(); |
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} else if (process.argv.length > 2) { |
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process.argv.forEach(function(val, index, array) {
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if (val.indexOf("tracker") > -1) { |
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eyeTracker = val.split("=")[1]; |
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} |
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}); |
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} |
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if (eyeTracker == "" || eyeTracker == undefined) { |
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console.log("tracker was not set - exiting.");
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process.exit(); |
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} |
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console.log("Tracker is " + eyeTracker);
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function createServer() { |
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websocket_server = ws.createServer(function(conn) {
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conn.on("text", function(str) { |
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var senderID;
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for (var c in connectionManager) { |
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//console.log(c+"{__}"+position);
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if (conn == connectionManager[c].conn) {
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senderID = connectionManager[c].id; |
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} |
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} |
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console.log("Message from connection with id:" + senderID + " : \"" + str + "\""); |
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if (str.indexOf("TYPE") > -1) { |
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console.log("typestring: " + str);
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var clientType = str.split(':'); |
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//connectionManager[connectionId] = new Array();
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console.log("type = " + clientType[1]); |
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for (var c in connectionManager) { |
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//console.log("Sending SMI Data: "+str);
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if (connectionManager[c]['conn'] == conn) { |
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connectionManager[c]['type'] = clientType[1]; |
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} |
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} |
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} |
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if (eyeTracker == "smi") { |
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try {
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for (var c in connectionManager) { |
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console.log("Sending SMI Data: " + str);
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if (connectionManager[c]['type'] == "browser") { |
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connectionManager[c]['conn'].sendText(str);
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} |
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} |
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} catch (err) {
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console.log("error in websocketserver: ");
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console.log("error at line:" + err.lineNumber);
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console.log("error:" + err);
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console.log("error at message:" + data);
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console.log("trying to establish new connection");
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createServer(); |
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} |
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} |
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if (eyeTracker == "mygaze") { |
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try {
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for (var c in connectionManager) { |
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console.log("Sending myGaze Data: " + str);
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if (connectionManager[c]['type'] == "browser") { |
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connectionManager[c]['conn'].sendText(str);
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} |
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} |
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} catch (err) {
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console.log("error in websocketserver: ");
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console.log("error at line:" + err.lineNumber);
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console.log("error:" + err);
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console.log("error at message:" + data);
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console.log("trying to establish new connection");
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createServer(); |
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} |
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} |
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if (eyeTracker == "eyetribe") { |
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//send the message from the browser directly to the eyetracker
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client.write(str); |
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} |
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}); |
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conn.on('error', function(er) { |
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// The error won't crash the process, but what it does is worse!
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// Though we've prevented abrupt process restarting, we are leaking
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// resources like crazy if this ever happens.
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// This is no better than process.on('uncaughtException')!
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console.log(eyeTracker +" disconnected. ERRORMESSAGE: ", er.message);
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}); |
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conn.on("close", function(code, reason) { |
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for (var c in connectionManager) { |
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//console.log(c+"{__}"+position);
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if (conn == connectionManager[c].conn) {
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console.log("connection '" + c + "' disconnected."); |
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delete connectionManager[c];
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} |
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} |
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}); |
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}).listen(6777);
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websocket_server.on("connection", function(conn) { |
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connectionManager[connectionId] = []; |
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connectionManager[connectionId].conn = conn; |
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connectionManager[connectionId].id = connectionId; |
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console.log("A new client connected with id: " + connectionId);
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connectionId++; |
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}); |
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} |
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if (eyeTracker == "eyetribe") { |
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//Heartbeat timer
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setInterval(function() {
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if (connected) {
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sendHeartbeat(client); |
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} |
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}, 250);
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client.connect(PORT, HOST, function() {
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console.log('Websocket connected successfully to tcp server(EyeTracker): ' + HOST + ':' + PORT); |
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connected = true;
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//check the eyetracker status
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//client.write('{"category": "tracker","request": "get","values": ["push", "iscalibrated" ]}');
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//client.write('{"category": "tracker","request": "set","values": {"push": true,"version": 1}}');
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//client.write('{"category": "tracker","request" : "get","values": [ "push", "iscalibrated" ]}');
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}); |
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} else if (eyeTracker == "smi") { |
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console.log('Waiting for messages from SMI EyeTracker on 127.0.0.1:6777');
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} else if (eyeTracker == "mygaze") { |
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console.log('Waiting for messages from myGaze EyeTracker on 127.0.0.1:6777');
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} |
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//as soon as the websocket receives any data from the eyetracker it is forwarded to the browser
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client.on('data', function(data) { |
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try {
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for (var c in connectionManager) { |
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console.log("Sending EyeTrackingData to Browser: "+data);
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connectionManager[c]['conn'].sendText(data);
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} |
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} catch (err) {
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console.log("error in websocketserver: ");
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console.log("error at line:" + err.lineNumber);
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console.log("error:" + err);
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console.log("error at message:" + data);
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console.log("trying to establish new connection");
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createServer(); |
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} |
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// Close the client socket completely
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//client.destroy();
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}); |
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// Add a 'close' event handler for the client socket
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client.on('close', function() { |
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connected = false;
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console.log('EyeTracker Disconnected.');
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createServer(); |
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}); |
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function sendHeartbeat(socket) { |
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socket.write("{\"category\":\"heartbeat\",\"request\":null}");
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//console.log('Heartbeat sent.');
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} |
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try {
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createServer(); |
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} catch (err) {
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console.log("error in websocketserver: ");
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console.log("error at line:" + err.lineNumber);
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console.log("error:" + err);
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console.log("error at message:" + data);
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console.log("trying to establish new connection");
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createServer(); |
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} |