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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const CHECK_RTC_STATS_COLLECTION = [
"inboundRtpStreamStats",
"outboundRtpStreamStats",
"remoteInboundRtpStreamStats",
"remoteOutboundRtpStreamStats",
];
const DEFAULT_PROPS = {
avgPoints: 10,
histSecs: 15,
toRate: false,
noAvg: false,
fixedPointDecimals: 2,
toHuman: false,
};
const REMOTE_RTP_PROPS = "avgPoints=2;histSecs=90";
const GRAPH_KEYS = [
"inbound-rtp.framesPerSecond;noAvg",
"inbound-rtp.packetsReceived;toRate",
"inbound-rtp.packetsLost;toRate",
"inbound-rtp.jitter;fixedPointDecimals=4",
`remote-inbound-rtp.roundTripTime;${REMOTE_RTP_PROPS}`,
`remote-inbound-rtp.packetsReceived;toRate;${REMOTE_RTP_PROPS}`,
"outbound-rtp.packetsSent;toRate",
"outbound-rtp.nackCount",
"outbound-rtp.pliCount",
"outbound-rtp.firCount",
`remote-outbound-rtp.bytesSent;toHuman;toRate;${REMOTE_RTP_PROPS}`,
`remote-outbound-rtp.packetsSent;toRate;${REMOTE_RTP_PROPS}`,
]
.map(k => k.split(".", 2))
.reduce((mapOfArr, [k, rest]) => {
mapOfArr[k] ??= [];
const [subKey, ...conf] = rest.split(";");
let config = conf.reduce((c, v) => {
let [configName, ...configVal] = v.split("=", 2);
c[configName] = !configVal.length ? true : configVal[0];
return c;
}, {});
mapOfArr[k].push({ subKey, config });
return mapOfArr;
}, {});
// Sliding window iterator of size n (where: n >= 1) over the array.
// Only returns full windows.
// Returns [] if n > array.length.
// eachN(['a','b','c','d','e'], 3) will yield the following values:
// ['a','b','c'], ['b','c','d'], and ['c','d','e']
const eachN = (array, n) => {
return {
// Index state
index: 0,
// Iteration function
next() {
let slice = array.slice(this.index, this.index + n);
this.index++;
// Done is true _AFTER_ the last value has returned.
// When done is true, value is ignored.
return { value: slice, done: slice.length < n };
},
[Symbol.iterator]() {
return this;
},
};
};
const msToSec = ms => 1000 * ms;
//
// A subset of the graph data
//
class GraphDataSet {
constructor(dataPoints) {
this.dataPoints = dataPoints;
}
// The latest
latest = () => (this.dataPoints ? this.dataPoints.slice(-1)[0] : undefined);
earliest = () => (this.dataPoints ? this.dataPoints[0] : undefined);
// The returns the earliest time to graph
startTime = () => (this.earliest() || { time: 0 }).time;
// Returns the latest time to graph
stopTime = () => (this.latest() || { time: 0 }).time;
// Elapsed time within the display window
elapsed = () =>
this.dataPoints ? this.latest().time - this.earliest().time : 0;
// Return a new data set that has been filtered
filter = fn => new GraphDataSet([...this.dataPoints].filter(fn));
// The range of values in the set or or undefined if the set is empty
dataRange = () =>
this.dataPoints.reduce(
({ min, max }, { value }) => ({
min: Math.min(min, value),
max: Math.max(max, value),
}),
this.dataPoints.length
? { min: this.dataPoints[0].value, max: this.dataPoints[0].value }
: undefined
);
// Get the rates between points. By definition the rates will have
// one fewer data points.
toRateDataSet = () =>
new GraphDataSet(
[...eachN(this.dataPoints, 2)].map(([a, b]) => ({
// Time mid point
time: (b.time + a.time) / 2,
value: msToSec(b.value - a.value) / (b.time - a.time),
}))
);
average = samples =>
samples.reduce(
({ time, value }, { time: t, value: v }) => ({
time: time + t / samples.length,
value: value + v / samples.length,
}),
{ time: 0, value: 0 }
);
toRollingAverageDataSet = sampleSize =>
new GraphDataSet([...eachN(this.dataPoints, sampleSize)].map(this.average));
}
class GraphData {
constructor(id, key, subKey, config) {
this.id = id;
this.key = key;
this.subKey = subKey;
this.data = [];
this.config = Object.assign({}, DEFAULT_PROPS, config);
}
setValueForTime(dataPoint) {
this.data = this.data.filter(({ time: t }) => t != dataPoint.time);
this.data.push(dataPoint);
}
getValuesSince = time => this.data.filter(dp => dp.time > time);
getDataSetSince = time =>
new GraphDataSet(this.data.filter(dp => dp.time > time));
getConfig = () => this.config;
// Cull old data, but keep twice the window size for average computation
cullData = timeNow =>
(this.data = this.data.filter(
({ time }) => time + msToSec(this.config.histSecs * 2) > timeNow
));
}
class GraphDb {
constructor(report) {
this.graphDatas = new Map();
this.insertReportData(report);
}
mkStoreKey = ({ id, key, subKey }) => `${key}.${id}.${subKey}`;
insertDataPoint(id, key, subKey, config, time, value) {
let storeKey = this.mkStoreKey({ id, key, subKey });
let data =
this.graphDatas.get(storeKey) || new GraphData(id, key, subKey, config);
data.setValueForTime({ time, value });
data.cullData(time);
this.graphDatas.set(storeKey, data);
}
insertReportData(report) {
if (report.timestamp == this.lastReportTimestamp) {
return;
}
this.lastReportTimestamp = report.timestamp;
CHECK_RTC_STATS_COLLECTION.forEach(listName => {
(report[listName] || []).forEach(stats => {
(GRAPH_KEYS[stats.type] || []).forEach(({ subKey, config }) => {
if (stats[subKey] !== undefined) {
this.insertDataPoint(
stats.id,
stats.type,
subKey,
config,
stats.timestamp,
stats[subKey]
);
}
});
});
});
}
getGraphDataById = id =>
[...this.graphDatas.values()].filter(gd => gd.id == id);
}
export { GraphDb };
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