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