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wrapper.js
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wrapper.js
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// SockJS client-side Wrapper
var reconnectSwitch = false;
var reconnectionTimeout = 1000;
module.exports = function(serverStatus, message, config){
var config = config || {};
return {
connect: function(){
var sock = new SockJS('/ws', {}, config);
sock.onopen = function() {
var sessionId = getCookie('connect.sid');
if (sessionId) {
sock.send('X|' + sessionId);
} else{
console.error('Unable to obtain session ID');
}
};
sock.onmessage = function(e) {
var i, x, msg = e.data;
// Attempt to get the responderId from each message
if ( (i = msg.indexOf('|')) > 0) {
var responderId = msg.substr(0, i),
content = msg.substr(i+1);
switch (responderId) {
// X = a system message
case 'X':
if (reconnectSwitch === false) {
serverStatus.emit('ready');
} else {
reconnectionTimeout = 1000;
serverStatus.emit('reconnect');
}
break;
// 0 = incoming events
// As events are so integral to SocketStream rather than breaking up the JSON message
// sent over the event transport for efficiencies sake we append the meta data (typically
// the channel name) at the end of the JSON message after the final pipe | character
case '0':
if ( (x = content.lastIndexOf('|')) > 0) {
var event = content.substr(0, x),
meta = content.substr(x+1);
message.emit(responderId, event, meta);
} else {
console.error('Invalid event message received:', msg);
}
break;
// All other messages are passed directly to the relevant Request Responder
default:
message.emit(responderId, content);
}
// EVERY message should have a responderId
// If we can't find one, it's a malformed request
} else {
console.error('Invalid websocket message received:', msg);
}
};
var attemptReconnect = function(time){
setTimeout(function(){
ss.assignTransport(config);
if (ss.server.event != "reconnect") {
reconnectionTimeout *= 1.5;
}
}, time);
clearTimeout();
};
sock.onclose = function() {
reconnectSwitch = true;
serverStatus.emit('disconnect');
attemptReconnect(reconnectionTimeout);
};
// Return a function which is used to send all messages to the server
return function(msg){
sock.send(msg)
};
}
}
}
// Private
var getCookie = function(c_name) {
var c_end, c_start;
if (document.cookie.length > 0) {
c_start = document.cookie.indexOf(c_name + "=");
if (c_start !== -1) {
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexOf(";", c_start);
if (c_end === -1) c_end = document.cookie.length;
return unescape(document.cookie.substring(c_start, c_end));
}
}
return '';
}