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70 lines
1.5 KiB
70 lines
1.5 KiB
'use strict';
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var inherits = require('inherits')
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, EventEmitter = require('events').EventEmitter
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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:xhr');
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}
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function XhrReceiver(url, AjaxObject) {
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debug(url);
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EventEmitter.call(this);
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var self = this;
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this.bufferPosition = 0;
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this.xo = new AjaxObject('POST', url, null);
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this.xo.on('chunk', this._chunkHandler.bind(this));
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this.xo.once('finish', function(status, text) {
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debug('finish', status, text);
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self._chunkHandler(status, text);
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self.xo = null;
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var reason = status === 200 ? 'network' : 'permanent';
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debug('close', reason);
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self.emit('close', null, reason);
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self._cleanup();
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});
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}
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inherits(XhrReceiver, EventEmitter);
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XhrReceiver.prototype._chunkHandler = function(status, text) {
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debug('_chunkHandler', status);
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if (status !== 200 || !text) {
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return;
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}
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for (var idx = -1; ; this.bufferPosition += idx + 1) {
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var buf = text.slice(this.bufferPosition);
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idx = buf.indexOf('\n');
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if (idx === -1) {
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break;
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}
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var msg = buf.slice(0, idx);
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if (msg) {
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debug('message', msg);
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this.emit('message', msg);
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}
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}
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};
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XhrReceiver.prototype._cleanup = function() {
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debug('_cleanup');
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this.removeAllListeners();
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};
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XhrReceiver.prototype.abort = function() {
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debug('abort');
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if (this.xo) {
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this.xo.close();
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debug('close');
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this.emit('close', null, 'user');
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this.xo = null;
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}
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this._cleanup();
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};
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module.exports = XhrReceiver;
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