jiti-meet/react/features/connection-indicator/statsEmitter.js

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import _ from 'lodash';
import JitsiMeetJS from '../base/lib-jitsi-meet';
declare var APP: Object;
/**
* Contains all the callbacks to be notified when stats are updated.
*
* {
* userId: Function[]
* }
*/
const subscribers = {};
/**
* A singleton that acts as a pub/sub service for connection stat updates.
*/
const statsEmitter = {
/**
* Have {@code statsEmitter} subscribe to stat updates from a given
* conference.
*
* @param {JitsiConference} conference - The conference for which
* {@code statsEmitter} should subscribe for stat updates.
* @returns {void}
*/
startListeningForStats(conference) {
const { connectionQuality } = JitsiMeetJS.events;
conference.on(connectionQuality.LOCAL_STATS_UPDATED,
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stats => this._onStatsUpdated(conference.myUserId(), stats));
conference.on(connectionQuality.REMOTE_STATS_UPDATED,
(id, stats) => this._emitStatsUpdate(id, stats));
},
/**
* Add a subscriber to be notified when stats are updated for a specified
* user id.
*
* @param {string} id - The user id whose stats updates are of interest.
* @param {Function} callback - The function to invoke when stats for the
* user have been updated.
* @returns {void}
*/
subscribeToClientStats(id, callback) {
if (!id) {
return;
}
if (!subscribers[id]) {
subscribers[id] = [];
}
subscribers[id].push(callback);
},
/**
* Remove a subscriber that is listening for stats updates for a specified
* user id.
*
* @param {string} id - The user id whose stats updates are no longer of
* interest.
* @param {Function} callback - The function that is currently subscribed to
* stat updates for the specified user id.
* @returns {void}
*/
unsubscribeToClientStats(id, callback) {
if (!subscribers[id]) {
return;
}
const filteredSubscribers = subscribers[id].filter(
subscriber => subscriber !== callback);
if (filteredSubscribers.length) {
subscribers[id] = filteredSubscribers;
} else {
delete subscribers[id];
}
},
/**
* Emit a stat update to all those listening for a specific user's
* connection stats.
*
* @param {string} id - The user id the stats are associated with.
* @param {Object} stats - New connection stats for the user.
* @returns {void}
*/
_emitStatsUpdate(id, stats = {}) {
const callbacks = subscribers[id] || [];
callbacks.forEach(callback => {
callback(stats);
});
},
/**
* Emit a stat update to all those listening for local stat updates. Will
* also update listeners of remote user stats of changes related to their
* stats.
*
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* @param {string} currentUserId - The user id for the local user.
* @param {Object} stats - Connection stats for the local user as provided
* by the library.
* @returns {void}
*/
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_onStatsUpdated(currentUserId, stats) {
const allUserFramerates = stats.framerate;
const allUserResolutions = stats.resolution;
const currentUserFramerate = allUserFramerates[currentUserId];
const currentUserResolution = allUserResolutions[currentUserId];
// FIXME resolution and framerate are hashes keyed off of user ids with
// stat values. Receivers of stats expect resolution and framerate to
// be primatives, not hashes, so overwrites the 'lib-jitsi-meet' stats
// objects.
stats.framerate = currentUserFramerate;
stats.resolution = currentUserResolution;
this._emitStatsUpdate(currentUserId, stats);
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// Get all the unique user ids from the framerate and resolution stats
// and update remote user stats as needed.
const framerateUserIds = Object.keys(allUserFramerates);
const resolutionUserIds = Object.keys(allUserResolutions);
_.union(framerateUserIds, resolutionUserIds)
.filter(id => id !== currentUserId)
.forEach(id => {
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const remoteUserStats = {};
const framerate = allUserFramerates[id];
if (framerate) {
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remoteUserStats.framerate = framerate;
}
const resolution = allUserResolutions[id];
if (resolution) {
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remoteUserStats.resolution = resolution;
}
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this._emitStatsUpdate(id, remoteUserStats);
});
}
};
export default statsEmitter;