aaac7fed
 liuqimichale
add
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'use strict';
var inherits = require('inherits')
, EventEmitter = require('events').EventEmitter
, EventSourceDriver = require('eventsource')
;
var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
debug = require('debug')('sockjs-client:receiver:eventsource');
}
function EventSourceReceiver(url) {
debug(url);
EventEmitter.call(this);
var self = this;
var es = this.es = new EventSourceDriver(url);
es.onmessage = function(e) {
debug('message', e.data);
self.emit('message', decodeURI(e.data));
};
es.onerror = function(e) {
debug('error', es.readyState, e);
// ES on reconnection has readyState = 0 or 1.
// on network error it's CLOSED = 2
var reason = (es.readyState !== 2 ? 'network' : 'permanent');
self._cleanup();
self._close(reason);
};
}
inherits(EventSourceReceiver, EventEmitter);
EventSourceReceiver.prototype.abort = function() {
debug('abort');
this._cleanup();
this._close('user');
};
EventSourceReceiver.prototype._cleanup = function() {
debug('cleanup');
var es = this.es;
if (es) {
es.onmessage = es.onerror = null;
es.close();
this.es = null;
}
};
EventSourceReceiver.prototype._close = function(reason) {
debug('close', reason);
var self = this;
// Safari and chrome < 15 crash if we close window before
// waiting for ES cleanup. See:
// https://code.google.com/p/chromium/issues/detail?id=89155
setTimeout(function() {
self.emit('close', null, reason);
self.removeAllListeners();
}, 200);
};
module.exports = EventSourceReceiver;
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