jiti-meet/modules/connectionquality/connectionquality.js

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var EventEmitter = require("events");
var eventEmitter = new EventEmitter();
var CQEvents = require("../../service/connectionquality/CQEvents");
var XMPPEvents = require("../../service/xmpp/XMPPEvents");
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/**
* local stats
* @type {{}}
*/
var stats = {};
/**
* remote stats
* @type {{}}
*/
var remoteStats = {};
/**
* Interval for sending statistics to other participants
* @type {null}
*/
var sendIntervalId = null;
/**
* Start statistics sending.
*/
function startSendingStats() {
sendStats();
sendIntervalId = setInterval(sendStats, 10000);
}
/**
* Sends statistics to other participants
*/
function sendStats() {
APP.xmpp.addToPresence("connectionQuality", convertToMUCStats(stats));
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}
/**
* Converts statistics to format for sending through XMPP
* @param stats the statistics
* @returns {{bitrate_donwload: *, bitrate_uplpoad: *, packetLoss_total: *, packetLoss_download: *, packetLoss_upload: *}}
*/
function convertToMUCStats(stats) {
return {
"bitrate_download": stats.bitrate.download,
"bitrate_upload": stats.bitrate.upload,
"packetLoss_total": stats.packetLoss.total,
"packetLoss_download": stats.packetLoss.download,
"packetLoss_upload": stats.packetLoss.upload
};
}
/**
* Converts statitistics to format used by VideoLayout
* @param stats
* @returns {{bitrate: {download: *, upload: *}, packetLoss: {total: *, download: *, upload: *}}}
*/
function parseMUCStats(stats) {
return {
bitrate: {
download: stats.bitrate_download,
upload: stats.bitrate_upload
},
packetLoss: {
total: stats.packetLoss_total,
download: stats.packetLoss_download,
upload: stats.packetLoss_upload
}
};
}
var ConnectionQuality = {
init: function () {
APP.xmpp.addListener(XMPPEvents.REMOTE_STATS, this.updateRemoteStats);
APP.statistics.addConnectionStatsListener(this.updateLocalStats);
APP.statistics.addRemoteStatsStopListener(this.stopSendingStats);
},
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/**
* Updates the local statistics
* @param data new statistics
*/
updateLocalStats: function (data) {
stats = data;
eventEmitter.emit(CQEvents.LOCALSTATS_UPDATED, 100 - stats.packetLoss.total, stats);
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if (sendIntervalId == null) {
startSendingStats();
}
},
/**
* Updates remote statistics
* @param jid the jid associated with the statistics
* @param data the statistics
*/
updateRemoteStats: function (jid, data) {
if (data == null || data.packetLoss_total == null) {
eventEmitter.emit(CQEvents.REMOTESTATS_UPDATED, jid, null, null);
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return;
}
remoteStats[jid] = parseMUCStats(data);
eventEmitter.emit(CQEvents.REMOTESTATS_UPDATED,
jid, 100 - data.packetLoss_total, remoteStats[jid]);
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},
/**
* Stops statistics sending.
*/
stopSendingStats: function () {
clearInterval(sendIntervalId);
sendIntervalId = null;
//notify UI about stopping statistics gathering
eventEmitter.emit(CQEvents.STOP);
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},
/**
* Returns the local statistics.
*/
getStats: function () {
return stats;
},
addListener: function (type, listener) {
eventEmitter.on(type, listener);
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}
};
module.exports = ConnectionQuality;