forked from projectmoon/tenebrous-dicebot
88 lines
2.2 KiB
JavaScript
88 lines
2.2 KiB
JavaScript
'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:buffered-sender');
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}
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function BufferedSender(url, sender) {
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debug(url);
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EventEmitter.call(this);
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this.sendBuffer = [];
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this.sender = sender;
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this.url = url;
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}
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inherits(BufferedSender, EventEmitter);
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BufferedSender.prototype.send = function(message) {
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debug('send', message);
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this.sendBuffer.push(message);
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if (!this.sendStop) {
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this.sendSchedule();
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}
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};
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// For polling transports in a situation when in the message callback,
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// new message is being send. If the sending connection was started
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// before receiving one, it is possible to saturate the network and
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// timeout due to the lack of receiving socket. To avoid that we delay
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// sending messages by some small time, in order to let receiving
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// connection be started beforehand. This is only a halfmeasure and
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// does not fix the big problem, but it does make the tests go more
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// stable on slow networks.
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BufferedSender.prototype.sendScheduleWait = function() {
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debug('sendScheduleWait');
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var self = this;
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var tref;
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this.sendStop = function() {
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debug('sendStop');
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self.sendStop = null;
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clearTimeout(tref);
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};
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tref = setTimeout(function() {
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debug('timeout');
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self.sendStop = null;
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self.sendSchedule();
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}, 25);
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};
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BufferedSender.prototype.sendSchedule = function() {
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debug('sendSchedule', this.sendBuffer.length);
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var self = this;
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if (this.sendBuffer.length > 0) {
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var payload = '[' + this.sendBuffer.join(',') + ']';
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this.sendStop = this.sender(this.url, payload, function(err) {
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self.sendStop = null;
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if (err) {
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debug('error', err);
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self.emit('close', err.code || 1006, 'Sending error: ' + err);
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self.close();
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} else {
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self.sendScheduleWait();
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}
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});
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this.sendBuffer = [];
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}
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};
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BufferedSender.prototype._cleanup = function() {
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debug('_cleanup');
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this.removeAllListeners();
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};
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BufferedSender.prototype.close = function() {
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debug('close');
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this._cleanup();
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if (this.sendStop) {
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this.sendStop();
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this.sendStop = null;
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}
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};
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module.exports = BufferedSender;
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