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p2p-media-loader-core.js
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p2p-media-loader-core.js
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require=(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
"use strict";
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const SMOOTH_INTERVAL = 1 * 1000;
const MEASURE_INTERVAL = 60 * 1000;
class NumberWithTime {
constructor(value, timeStamp) {
this.value = value;
this.timeStamp = timeStamp;
}
}
class BandwidthApproximator {
constructor() {
this.lastBytes = [];
this.currentBytesSum = 0;
this.lastBandwidth = [];
}
addBytes(bytes, timeStamp) {
this.lastBytes.push(new NumberWithTime(bytes, timeStamp));
this.currentBytesSum += bytes;
while (timeStamp - this.lastBytes[0].timeStamp > SMOOTH_INTERVAL) {
this.currentBytesSum -= this.lastBytes.shift().value;
}
this.lastBandwidth.push(new NumberWithTime(this.currentBytesSum / SMOOTH_INTERVAL, timeStamp));
}
// in bytes per millisecond
getBandwidth(timeStamp) {
while (this.lastBandwidth.length != 0 && timeStamp - this.lastBandwidth[0].timeStamp > MEASURE_INTERVAL) {
this.lastBandwidth.shift();
}
let maxBandwidth = 0;
for (const bandwidth of this.lastBandwidth) {
if (bandwidth.value > maxBandwidth) {
maxBandwidth = bandwidth.value;
}
}
return maxBandwidth;
}
getSmoothInterval() {
return SMOOTH_INTERVAL;
}
getMeasureInterval() {
return MEASURE_INTERVAL;
}
}
exports.BandwidthApproximator = BandwidthApproximator;
},{}],2:[function(require,module,exports){
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
if (!window.p2pml) {
window.p2pml = {};
}
window.p2pml.core = require("./index");
},{"./index":"p2p-media-loader-core"}],3:[function(require,module,exports){
"use strict";
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const Debug = require("debug");
const stringly_typed_event_emitter_1 = require("./stringly-typed-event-emitter");
class HttpMediaManager extends stringly_typed_event_emitter_1.STEEmitter {
constructor(settings) {
super();
this.settings = settings;
this.xhrRequests = new Map();
this.failedSegments = new Map();
this.debug = Debug("p2pml:http-media-manager");
this.now = () => performance.now();
}
download(segment, downloadedPieces) {
if (this.isDownloading(segment)) {
return;
}
this.cleanTimedOutFailedSegments();
const segmentUrl = this.settings.segmentUrlBuilder
? this.settings.segmentUrlBuilder(segment)
: segment.url;
this.debug("http segment download", segmentUrl);
segment.requestUrl = segmentUrl;
const xhr = new XMLHttpRequest();
xhr.open("GET", segmentUrl, true);
xhr.responseType = "arraybuffer";
if (segment.range) {
xhr.setRequestHeader("Range", segment.range);
downloadedPieces = undefined; // TODO: process downloadedPieces for segments with range headers too
}
else if ((downloadedPieces !== undefined) && this.settings.httpUseRanges) {
let bytesDownloaded = 0;
for (const piece of downloadedPieces) {
bytesDownloaded += piece.byteLength;
}
xhr.setRequestHeader("Range", `bytes=${bytesDownloaded}-`);
this.debug("continue download from", bytesDownloaded);
}
else {
downloadedPieces = undefined;
}
this.setupXhrEvents(xhr, segment, downloadedPieces);
if (this.settings.xhrSetup) {
this.settings.xhrSetup(xhr, segmentUrl);
}
this.xhrRequests.set(segment.id, { xhr, segment });
xhr.send();
}
abort(segment) {
const request = this.xhrRequests.get(segment.id);
if (request) {
request.xhr.abort();
this.xhrRequests.delete(segment.id);
this.debug("http segment abort", segment.id);
}
}
isDownloading(segment) {
return this.xhrRequests.has(segment.id);
}
isFailed(segment) {
const time = this.failedSegments.get(segment.id);
return time !== undefined && time > this.now();
}
getActiveDownloads() {
return this.xhrRequests;
}
getActiveDownloadsCount() {
return this.xhrRequests.size;
}
destroy() {
this.xhrRequests.forEach(request => request.xhr.abort());
this.xhrRequests.clear();
}
setupXhrEvents(xhr, segment, downloadedPieces) {
let prevBytesLoaded = 0;
xhr.addEventListener("progress", (event) => {
const bytesLoaded = event.loaded - prevBytesLoaded;
this.emit("bytes-downloaded", bytesLoaded);
prevBytesLoaded = event.loaded;
});
xhr.addEventListener("load", async (event) => {
if ((event.target.status < 200) || (event.target.status >= 300)) {
this.segmentFailure(segment, event, xhr);
return;
}
let data = event.target.response;
if ((downloadedPieces !== undefined) && (event.target.status === 206)) {
let bytesDownloaded = 0;
for (const piece of downloadedPieces) {
bytesDownloaded += piece.byteLength;
}
const segmentData = new Uint8Array(bytesDownloaded + data.byteLength);
let offset = 0;
for (const piece of downloadedPieces) {
segmentData.set(new Uint8Array(piece), offset);
offset += piece.byteLength;
}
segmentData.set(new Uint8Array(data), offset);
data = segmentData.buffer;
}
await this.segmentDownloadFinished(segment, data, xhr);
});
xhr.addEventListener("error", (event) => {
this.segmentFailure(segment, event, xhr);
});
xhr.addEventListener("timeout", (event) => {
this.segmentFailure(segment, event, xhr);
});
}
async segmentDownloadFinished(segment, data, xhr) {
segment.responseUrl = xhr.responseURL === null ? undefined : xhr.responseURL;
if (this.settings.segmentValidator) {
try {
await this.settings.segmentValidator(Object.assign(Object.assign({}, segment), { data: data }), "http");
}
catch (error) {
this.debug("segment validator failed", error);
this.segmentFailure(segment, error, xhr);
return;
}
}
this.xhrRequests.delete(segment.id);
this.emit("segment-loaded", segment, data);
}
segmentFailure(segment, error, xhr) {
segment.responseUrl = xhr.responseURL === null ? undefined : xhr.responseURL;
this.xhrRequests.delete(segment.id);
this.failedSegments.set(segment.id, this.now() + this.settings.httpFailedSegmentTimeout);
this.emit("segment-error", segment, error);
}
cleanTimedOutFailedSegments() {
const now = this.now();
const candidates = [];
this.failedSegments.forEach((time, id) => {
if (time < now) {
candidates.push(id);
}
});
candidates.forEach(id => this.failedSegments.delete(id));
}
}
exports.HttpMediaManager = HttpMediaManager;
},{"./stringly-typed-event-emitter":9,"debug":"debug"}],4:[function(require,module,exports){
"use strict";
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const Debug = require("debug");
const loader_interface_1 = require("./loader-interface");
const events_1 = require("events");
const http_media_manager_1 = require("./http-media-manager");
const p2p_media_manager_1 = require("./p2p-media-manager");
const media_peer_1 = require("./media-peer");
const bandwidth_approximator_1 = require("./bandwidth-approximator");
const segments_memory_storage_1 = require("./segments-memory-storage");
const getBrowserRTC = require("get-browser-rtc");
const Peer = require("simple-peer");
const defaultSettings = {
cachedSegmentExpiration: 5 * 60 * 1000,
cachedSegmentsCount: 30,
useP2P: true,
consumeOnly: false,
requiredSegmentsPriority: 1,
simultaneousHttpDownloads: 2,
httpDownloadProbability: 0.1,
httpDownloadProbabilityInterval: 1000,
httpDownloadProbabilitySkipIfNoPeers: false,
httpFailedSegmentTimeout: 10000,
httpDownloadMaxPriority: 20,
httpDownloadInitialTimeout: 0,
httpDownloadInitialTimeoutPerSegment: 4000,
httpUseRanges: false,
simultaneousP2PDownloads: 3,
p2pDownloadMaxPriority: 20,
p2pSegmentDownloadTimeout: 60000,
webRtcMaxMessageSize: 64 * 1024 - 1,
trackerAnnounce: ["wss://tracker.novage.com.ua", "wss://tracker.openwebtorrent.com"],
peerRequestsPerAnnounce: 10,
rtcConfig: Peer.config
};
class HybridLoader extends events_1.EventEmitter {
constructor(settings = {}) {
super();
this.debug = Debug("p2pml:hybrid-loader");
this.debugSegments = Debug("p2pml:hybrid-loader-segments");
this.segmentsQueue = [];
this.bandwidthApproximator = new bandwidth_approximator_1.BandwidthApproximator();
this.httpDownloadInitialTimeoutTimestamp = -Infinity;
this.processInitialSegmentTimeout = async () => {
if (this.httpRandomDownloadInterval === undefined) {
return; // Instance destroyed
}
if (this.masterSwarmId !== undefined) {
const storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
if (this.processSegmentsQueue(storageSegments) && !this.settings.consumeOnly) {
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
}
}
if (this.httpDownloadInitialTimeoutTimestamp !== -Infinity) {
// Set one more timeout for a next segment
setTimeout(this.processInitialSegmentTimeout, this.settings.httpDownloadInitialTimeoutPerSegment);
}
};
this.downloadRandomSegmentOverHttp = async () => {
if (this.masterSwarmId === undefined ||
this.httpRandomDownloadInterval === undefined ||
this.httpDownloadInitialTimeoutTimestamp !== -Infinity ||
this.httpManager.getActiveDownloadsCount() >= this.settings.simultaneousHttpDownloads ||
(this.settings.httpDownloadProbabilitySkipIfNoPeers && this.p2pManager.getPeers().size === 0) ||
this.settings.consumeOnly) {
return;
}
const storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
const segmentsMap = this.p2pManager.getOvrallSegmentsMap();
const pendingQueue = this.segmentsQueue.filter(s => !this.p2pManager.isDownloading(s) &&
!this.httpManager.isDownloading(s) &&
!segmentsMap.has(s.id) &&
!this.httpManager.isFailed(s) &&
(s.priority <= this.settings.httpDownloadMaxPriority) &&
!storageSegments.has(s.id));
if (pendingQueue.length == 0) {
return;
}
if (Math.random() > this.settings.httpDownloadProbability * pendingQueue.length) {
return;
}
const segment = pendingQueue[Math.floor(Math.random() * pendingQueue.length)];
this.debugSegments("HTTP download (random)", segment.priority, segment.url);
this.httpManager.download(segment);
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
};
this.onPieceBytesDownloaded = (method, bytes, peerId) => {
this.bandwidthApproximator.addBytes(bytes, this.now());
this.emit(loader_interface_1.Events.PieceBytesDownloaded, method, bytes, peerId);
};
this.onPieceBytesUploaded = (method, bytes, peerId) => {
this.emit(loader_interface_1.Events.PieceBytesUploaded, method, bytes, peerId);
};
this.onSegmentLoaded = async (segment, data, peerId) => {
this.debugSegments("segment loaded", segment.id, segment.url);
if (this.masterSwarmId === undefined) {
return;
}
segment.data = data;
segment.downloadBandwidth = this.bandwidthApproximator.getBandwidth(this.now());
await this.segmentsStorage.storeSegment(segment);
this.emit(loader_interface_1.Events.SegmentLoaded, segment, peerId);
let storageSegments;
storageSegments = (storageSegments === undefined ? await this.segmentsStorage.getSegmentsMap(this.masterSwarmId) : storageSegments);
this.processSegmentsQueue(storageSegments);
if (!this.settings.consumeOnly) {
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
}
};
this.onSegmentError = async (segment, details, peerId) => {
this.debugSegments("segment error", segment.id, segment.url, peerId, details);
this.emit(loader_interface_1.Events.SegmentError, segment, details, peerId);
if (this.masterSwarmId !== undefined) {
const storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
if (this.processSegmentsQueue(storageSegments) && !this.settings.consumeOnly) {
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
}
}
};
this.onPeerConnect = async (peer) => {
this.emit(loader_interface_1.Events.PeerConnect, peer);
if (!this.settings.consumeOnly && this.masterSwarmId !== undefined) {
this.p2pManager.sendSegmentsMap(peer.id, this.createSegmentsMap(await this.segmentsStorage.getSegmentsMap(this.masterSwarmId)));
}
};
this.onPeerClose = (peerId) => {
this.emit(loader_interface_1.Events.PeerClose, peerId);
};
this.onTrackerUpdate = async (data) => {
if (this.httpDownloadInitialTimeoutTimestamp !== -Infinity &&
data.incomplete !== undefined && data.incomplete <= 1) {
this.debugSegments("cancel initial HTTP download timeout - no peers");
this.httpDownloadInitialTimeoutTimestamp = -Infinity;
if (this.masterSwarmId !== undefined) {
const storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
if (this.processSegmentsQueue(storageSegments) && !this.settings.consumeOnly) {
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
}
}
}
};
this.settings = Object.assign(Object.assign({}, defaultSettings), settings);
if (settings.bufferedSegmentsCount) {
if (settings.p2pDownloadMaxPriority === undefined) {
this.settings.p2pDownloadMaxPriority = settings.bufferedSegmentsCount;
}
if (settings.httpDownloadMaxPriority === undefined) {
this.settings.p2pDownloadMaxPriority = settings.bufferedSegmentsCount;
}
delete this.settings.bufferedSegmentsCount;
}
this.segmentsStorage = (this.settings.segmentsStorage === undefined
? new segments_memory_storage_1.SegmentsMemoryStorage(this.settings)
: this.settings.segmentsStorage);
this.debug("loader settings", this.settings);
this.httpManager = this.createHttpManager();
this.httpManager.on("segment-loaded", this.onSegmentLoaded);
this.httpManager.on("segment-error", this.onSegmentError);
this.httpManager.on("bytes-downloaded", (bytes) => this.onPieceBytesDownloaded("http", bytes));
this.p2pManager = this.createP2PManager();
this.p2pManager.on("segment-loaded", this.onSegmentLoaded);
this.p2pManager.on("segment-error", this.onSegmentError);
this.p2pManager.on("peer-data-updated", async () => {
if (this.masterSwarmId === undefined) {
return;
}
const storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
if (this.processSegmentsQueue(storageSegments) && !this.settings.consumeOnly) {
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
}
});
this.p2pManager.on("bytes-downloaded", (bytes, peerId) => this.onPieceBytesDownloaded("p2p", bytes, peerId));
this.p2pManager.on("bytes-uploaded", (bytes, peerId) => this.onPieceBytesUploaded("p2p", bytes, peerId));
this.p2pManager.on("peer-connected", this.onPeerConnect);
this.p2pManager.on("peer-closed", this.onPeerClose);
this.p2pManager.on("tracker-update", this.onTrackerUpdate);
}
static isSupported() {
const browserRtc = getBrowserRTC();
return (browserRtc && (browserRtc.RTCPeerConnection.prototype.createDataChannel !== undefined));
}
createHttpManager() {
return new http_media_manager_1.HttpMediaManager(this.settings);
}
createP2PManager() {
return new p2p_media_manager_1.P2PMediaManager(this.segmentsStorage, this.settings);
}
async load(segments, streamSwarmId) {
if (this.httpRandomDownloadInterval === undefined) { // Do once on first call
this.httpRandomDownloadInterval = setInterval(this.downloadRandomSegmentOverHttp, this.settings.httpDownloadProbabilityInterval);
if (this.settings.httpDownloadInitialTimeout > 0 && this.settings.httpDownloadInitialTimeoutPerSegment > 0) {
// Initialize initial HTTP download timeout (i.e. download initial segments over P2P)
this.debugSegments("enable initial HTTP download timeout", this.settings.httpDownloadInitialTimeout, "per segment", this.settings.httpDownloadInitialTimeoutPerSegment);
this.httpDownloadInitialTimeoutTimestamp = this.now();
setTimeout(this.processInitialSegmentTimeout, this.settings.httpDownloadInitialTimeoutPerSegment + 100);
}
}
if (segments.length > 0) {
this.masterSwarmId = segments[0].masterSwarmId;
}
if (this.masterSwarmId !== undefined) {
this.p2pManager.setStreamSwarmId(streamSwarmId, this.masterSwarmId);
}
this.debug("load segments");
let updateSegmentsMap = false;
// stop all http requests and p2p downloads for segments that are not in the new load
for (const segment of this.segmentsQueue) {
if (!segments.find(f => f.url == segment.url)) {
this.debug("remove segment", segment.url);
if (this.httpManager.isDownloading(segment)) {
updateSegmentsMap = true;
this.httpManager.abort(segment);
}
else {
this.p2pManager.abort(segment);
}
this.emit(loader_interface_1.Events.SegmentAbort, segment);
}
}
if (this.debug.enabled) {
for (const segment of segments) {
if (!this.segmentsQueue.find(f => f.url == segment.url)) {
this.debug("add segment", segment.url);
}
}
}
this.segmentsQueue = segments;
if (this.masterSwarmId === undefined) {
return;
}
let storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
updateSegmentsMap = (this.processSegmentsQueue(storageSegments) || updateSegmentsMap);
if (await this.cleanSegmentsStorage()) {
storageSegments = await this.segmentsStorage.getSegmentsMap(this.masterSwarmId);
updateSegmentsMap = true;
}
if (updateSegmentsMap && !this.settings.consumeOnly) {
this.p2pManager.sendSegmentsMapToAll(this.createSegmentsMap(storageSegments));
}
}
async getSegment(id) {
return this.masterSwarmId === undefined
? undefined
: this.segmentsStorage.getSegment(id, this.masterSwarmId);
}
getSettings() {
return this.settings;
}
getDetails() {
return {
peerId: this.p2pManager.getPeerId()
};
}
async destroy() {
if (this.httpRandomDownloadInterval !== undefined) {
clearInterval(this.httpRandomDownloadInterval);
this.httpRandomDownloadInterval = undefined;
}
this.httpDownloadInitialTimeoutTimestamp = -Infinity;
this.segmentsQueue = [];
this.httpManager.destroy();
this.p2pManager.destroy();
this.masterSwarmId = undefined;
await this.segmentsStorage.destroy();
}
processSegmentsQueue(storageSegments) {
this.debugSegments("process segments queue. priority", this.segmentsQueue.length > 0 ? this.segmentsQueue[0].priority : 0);
if (this.masterSwarmId === undefined || this.segmentsQueue.length === 0) {
return false;
}
let updateSegmentsMap = false;
let segmentsMap;
let httpAllowed = true;
if (this.httpDownloadInitialTimeoutTimestamp !== -Infinity) {
let firstNotDownloadePriority;
for (const segment of this.segmentsQueue) {
if (!storageSegments.has(segment.id)) {
firstNotDownloadePriority = segment.priority;
break;
}
}
const httpTimeout = this.now() - this.httpDownloadInitialTimeoutTimestamp;
httpAllowed = (httpTimeout >= this.settings.httpDownloadInitialTimeout)
|| ((firstNotDownloadePriority !== undefined) && (httpTimeout > this.settings.httpDownloadInitialTimeoutPerSegment) && (firstNotDownloadePriority <= 0));
if (httpAllowed) {
this.debugSegments("cancel initial HTTP download timeout - timed out");
this.httpDownloadInitialTimeoutTimestamp = -Infinity;
}
}
for (let index = 0; index < this.segmentsQueue.length; index++) {
const segment = this.segmentsQueue[index];
if (storageSegments.has(segment.id) || this.httpManager.isDownloading(segment)) {
continue;
}
if (segment.priority <= this.settings.requiredSegmentsPriority && httpAllowed && !this.httpManager.isFailed(segment)) {
// Download required segments over HTTP
if (this.httpManager.getActiveDownloadsCount() >= this.settings.simultaneousHttpDownloads) {
// Not enough HTTP download resources. Abort one of the HTTP downloads.
for (let i = this.segmentsQueue.length - 1; i > index; i--) {
const segmentToAbort = this.segmentsQueue[i];
if (this.httpManager.isDownloading(segmentToAbort)) {
this.debugSegments("cancel HTTP download", segmentToAbort.priority, segmentToAbort.url);
this.httpManager.abort(segmentToAbort);
break;
}
}
}
if (this.httpManager.getActiveDownloadsCount() < this.settings.simultaneousHttpDownloads) {
// Abort P2P download of the required segment if any and force HTTP download
const downloadedPieces = this.p2pManager.abort(segment);
this.httpManager.download(segment, downloadedPieces);
this.debugSegments("HTTP download (priority)", segment.priority, segment.url);
updateSegmentsMap = true;
continue;
}
}
if (this.p2pManager.isDownloading(segment)) {
continue;
}
if (segment.priority <= this.settings.requiredSegmentsPriority) { // Download required segments over P2P
segmentsMap = segmentsMap ? segmentsMap : this.p2pManager.getOvrallSegmentsMap();
if (segmentsMap.get(segment.id) !== media_peer_1.MediaPeerSegmentStatus.Loaded) {
continue;
}
if (this.p2pManager.getActiveDownloadsCount() >= this.settings.simultaneousP2PDownloads) {
// Not enough P2P download resources. Abort one of the P2P downloads.
for (let i = this.segmentsQueue.length - 1; i > index; i--) {
const segmentToAbort = this.segmentsQueue[i];
if (this.p2pManager.isDownloading(segmentToAbort)) {
this.debugSegments("cancel P2P download", segmentToAbort.priority, segmentToAbort.url);
this.p2pManager.abort(segmentToAbort);
break;
}
}
}
if (this.p2pManager.getActiveDownloadsCount() < this.settings.simultaneousP2PDownloads) {
if (this.p2pManager.download(segment)) {
this.debugSegments("P2P download (priority)", segment.priority, segment.url);
continue;
}
}
continue;
}
if (this.p2pManager.getActiveDownloadsCount() < this.settings.simultaneousP2PDownloads &&
segment.priority <= this.settings.p2pDownloadMaxPriority) {
if (this.p2pManager.download(segment)) {
this.debugSegments("P2P download", segment.priority, segment.url);
}
}
}
return updateSegmentsMap;
}
getStreamSwarmId(segment) {
return segment.streamId === undefined ? segment.masterSwarmId : `${segment.masterSwarmId}+${segment.streamId}`;
}
createSegmentsMap(storageSegments) {
const segmentsMap = {};
const addSegmentToMap = (segment, status) => {
const streamSwarmId = this.getStreamSwarmId(segment);
const segmentId = segment.sequence;
let segmentsIdsAndStatuses = segmentsMap[streamSwarmId];
if (segmentsIdsAndStatuses === undefined) {
segmentsIdsAndStatuses = ["", []];
segmentsMap[streamSwarmId] = segmentsIdsAndStatuses;
}
const segmentsStatuses = segmentsIdsAndStatuses[1];
segmentsIdsAndStatuses[0] += ((segmentsStatuses.length == 0) ? segmentId : `|${segmentId}`);
segmentsStatuses.push(status);
};
for (const storageSegment of storageSegments.values()) {
addSegmentToMap(storageSegment.segment, media_peer_1.MediaPeerSegmentStatus.Loaded);
}
for (const download of this.httpManager.getActiveDownloads().values()) {
addSegmentToMap(download.segment, media_peer_1.MediaPeerSegmentStatus.LoadingByHttp);
}
return segmentsMap;
}
async cleanSegmentsStorage() {
if (this.masterSwarmId === undefined) {
return false;
}
return this.segmentsStorage.clean(this.masterSwarmId, (id) => this.segmentsQueue.find(queueSegment => queueSegment.id === id) !== undefined);
}
now() {
return performance.now();
}
}
exports.HybridLoader = HybridLoader;
},{"./bandwidth-approximator":1,"./http-media-manager":3,"./loader-interface":5,"./media-peer":6,"./p2p-media-manager":7,"./segments-memory-storage":8,"debug":"debug","events":"events","get-browser-rtc":18,"simple-peer":44}],5:[function(require,module,exports){
"use strict";
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
var Events;
(function (Events) {
/**
* Emitted when segment has been downloaded.
* Args: segment
*/
Events["SegmentLoaded"] = "segment_loaded";
/**
* Emitted when an error occurred while loading the segment.
* Args: segment, error
*/
Events["SegmentError"] = "segment_error";
/**
* Emitted for each segment that does not hit into a new segments queue when the load() method is called.
* Args: segment
*/
Events["SegmentAbort"] = "segment_abort";
/**
* Emitted when a peer is connected.
* Args: peer
*/
Events["PeerConnect"] = "peer_connect";
/**
* Emitted when a peer is disconnected.
* Args: peerId
*/
Events["PeerClose"] = "peer_close";
/**
* Emitted when a segment piece has been downloaded.
* Args: method (can be "http" or "p2p" only), bytes
*/
Events["PieceBytesDownloaded"] = "piece_bytes_downloaded";
/**
* Emitted when a segment piece has been uploaded.
* Args: method (can be "p2p" only), bytes
*/
Events["PieceBytesUploaded"] = "piece_bytes_uploaded";
})(Events = exports.Events || (exports.Events = {}));
},{}],6:[function(require,module,exports){
"use strict";
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const Debug = require("debug");
const stringly_typed_event_emitter_1 = require("./stringly-typed-event-emitter");
const buffer_1 = require("buffer");
var MediaPeerCommands;
(function (MediaPeerCommands) {
MediaPeerCommands[MediaPeerCommands["SegmentData"] = 0] = "SegmentData";
MediaPeerCommands[MediaPeerCommands["SegmentAbsent"] = 1] = "SegmentAbsent";
MediaPeerCommands[MediaPeerCommands["SegmentsMap"] = 2] = "SegmentsMap";
MediaPeerCommands[MediaPeerCommands["SegmentRequest"] = 3] = "SegmentRequest";
MediaPeerCommands[MediaPeerCommands["CancelSegmentRequest"] = 4] = "CancelSegmentRequest";
})(MediaPeerCommands || (MediaPeerCommands = {}));
var MediaPeerSegmentStatus;
(function (MediaPeerSegmentStatus) {
MediaPeerSegmentStatus[MediaPeerSegmentStatus["Loaded"] = 0] = "Loaded";
MediaPeerSegmentStatus[MediaPeerSegmentStatus["LoadingByHttp"] = 1] = "LoadingByHttp";
})(MediaPeerSegmentStatus = exports.MediaPeerSegmentStatus || (exports.MediaPeerSegmentStatus = {}));
class DownloadingSegment {
constructor(id, size) {
this.id = id;
this.size = size;
this.bytesDownloaded = 0;
this.pieces = [];
}
}
class MediaPeer extends stringly_typed_event_emitter_1.STEEmitter {
constructor(peer, settings) {
super();
this.peer = peer;
this.settings = settings;
this.remoteAddress = "";
this.downloadingSegmentId = null;
this.downloadingSegment = null;
this.segmentsMap = new Map();
this.debug = Debug("p2pml:media-peer");
this.timer = null;
this.onPeerConnect = () => {
this.debug("peer connect", this.id, this);
this.remoteAddress = this.peer.remoteAddress;
this.emit("connect", this);
};
this.onPeerClose = () => {
this.debug("peer close", this.id, this);
this.terminateSegmentRequest();
this.emit("close", this);
};
this.onPeerError = (error) => {
this.debug("peer error", this.id, error, this);
};
this.onPeerData = (data) => {
const command = this.getJsonCommand(data);
if (command == null) {
this.receiveSegmentPiece(data);
return;
}
if (this.downloadingSegment) {
this.debug("peer segment download is interrupted by a command", this.id, this);
const segmentId = this.downloadingSegment.id;
this.terminateSegmentRequest();
this.emit("segment-error", this, segmentId, "Segment download is interrupted by a command");
return;
}
this.debug("peer receive command", this.id, command, this);
switch (command.c) {
case MediaPeerCommands.SegmentsMap:
this.segmentsMap = this.createSegmentsMap(command.m);
this.emit("data-updated");
break;
case MediaPeerCommands.SegmentRequest:
this.emit("segment-request", this, command.i);
break;
case MediaPeerCommands.SegmentData:
if (this.downloadingSegmentId === command.i) {
this.downloadingSegment = new DownloadingSegment(command.i, command.s);
this.cancelResponseTimeoutTimer();
}
break;
case MediaPeerCommands.SegmentAbsent:
if (this.downloadingSegmentId === command.i) {
this.terminateSegmentRequest();
this.segmentsMap.delete(command.i);
this.emit("segment-absent", this, command.i);
}
break;
case MediaPeerCommands.CancelSegmentRequest:
// TODO: peer stop sending buffer
break;
default:
break;
}
};
this.peer.on("connect", this.onPeerConnect);
this.peer.on("close", this.onPeerClose);
this.peer.on("error", this.onPeerError);
this.peer.on("data", this.onPeerData);
this.id = peer.id;
}
receiveSegmentPiece(data) {
if (!this.downloadingSegment) {
// The segment was not requested or canceled
this.debug("peer segment not requested", this.id, this);
return;
}
this.downloadingSegment.bytesDownloaded += data.byteLength;
this.downloadingSegment.pieces.push(data);
this.emit("bytes-downloaded", this, data.byteLength);
const segmentId = this.downloadingSegment.id;
if (this.downloadingSegment.bytesDownloaded == this.downloadingSegment.size) {
const segmentData = new Uint8Array(this.downloadingSegment.size);
let offset = 0;
for (const piece of this.downloadingSegment.pieces) {
segmentData.set(new Uint8Array(piece), offset);
offset += piece.byteLength;
}
this.debug("peer segment download done", this.id, segmentId, this);
this.terminateSegmentRequest();
this.emit("segment-loaded", this, segmentId, segmentData.buffer);
}
else if (this.downloadingSegment.bytesDownloaded > this.downloadingSegment.size) {
this.debug("peer segment download bytes mismatch", this.id, segmentId, this);
this.terminateSegmentRequest();
this.emit("segment-error", this, segmentId, "Too many bytes received for segment");
}
}
getJsonCommand(data) {
const bytes = new Uint8Array(data);
// Serialized JSON string check by first, second and last characters: '{" .... }'
if (bytes[0] == 123 && bytes[1] == 34 && bytes[data.byteLength - 1] == 125) {
try {
return JSON.parse(new TextDecoder().decode(data));
}
catch (_a) {
}
}
return null;
}
createSegmentsMap(segments) {
if (segments == undefined || !(segments instanceof Object)) {
return new Map();
}
const segmentsMap = new Map();
for (const streamSwarmId of Object.keys(segments)) {
const swarmData = segments[streamSwarmId];
if (!(swarmData instanceof Array) ||
(swarmData.length !== 2) ||
(typeof swarmData[0] !== "string") ||
!(swarmData[1] instanceof Array)) {
return new Map();
}
const segmentsIds = swarmData[0].split("|");
const segmentsStatuses = swarmData[1];
if (segmentsIds.length !== segmentsStatuses.length) {
return new Map();
}
for (let i = 0; i < segmentsIds.length; i++) {
const segmentStatus = segmentsStatuses[i];
if (typeof segmentStatus !== "number" || MediaPeerSegmentStatus[segmentStatus] === undefined) {
return new Map();
}
segmentsMap.set(`${streamSwarmId}+${segmentsIds[i]}`, segmentStatus);
}
}
return segmentsMap;
}
sendCommand(command) {
this.debug("peer send command", this.id, command, this);
this.peer.write(JSON.stringify(command));
}
destroy() {
this.debug("peer destroy", this.id, this);
this.terminateSegmentRequest();
this.peer.destroy();
}
getDownloadingSegmentId() {
return this.downloadingSegmentId;
}
getSegmentsMap() {
return this.segmentsMap;
}
sendSegmentsMap(segmentsMap) {
this.sendCommand({ c: MediaPeerCommands.SegmentsMap, m: segmentsMap });
}
sendSegmentData(segmentId, data) {
this.sendCommand({
c: MediaPeerCommands.SegmentData,
i: segmentId,
s: data.byteLength
});
let bytesLeft = data.byteLength;
while (bytesLeft > 0) {
const bytesToSend = (bytesLeft >= this.settings.webRtcMaxMessageSize ? this.settings.webRtcMaxMessageSize : bytesLeft);
const buffer = buffer_1.Buffer.from(data, data.byteLength - bytesLeft, bytesToSend);
this.peer.write(buffer);
bytesLeft -= bytesToSend;
}
this.emit("bytes-uploaded", this, data.byteLength);
}
sendSegmentAbsent(segmentId) {
this.sendCommand({ c: MediaPeerCommands.SegmentAbsent, i: segmentId });
}
requestSegment(segmentId) {
if (this.downloadingSegmentId) {
throw new Error("A segment is already downloading: " + this.downloadingSegmentId);
}
this.sendCommand({ c: MediaPeerCommands.SegmentRequest, i: segmentId });
this.downloadingSegmentId = segmentId;
this.runResponseTimeoutTimer();
}
cancelSegmentRequest() {
let downloadingSegment;
if (this.downloadingSegmentId) {
const segmentId = this.downloadingSegmentId;
downloadingSegment = this.downloadingSegment ? this.downloadingSegment.pieces : undefined;
this.terminateSegmentRequest();
this.sendCommand({ c: MediaPeerCommands.CancelSegmentRequest, i: segmentId });
}
return downloadingSegment;
}
runResponseTimeoutTimer() {
this.timer = setTimeout(() => {
this.timer = null;
if (!this.downloadingSegmentId) {
return;
}
const segmentId = this.downloadingSegmentId;
this.cancelSegmentRequest();
this.emit("segment-timeout", this, segmentId); // TODO: send peer not responding event
}, this.settings.p2pSegmentDownloadTimeout);
}
cancelResponseTimeoutTimer() {
if (this.timer) {
clearTimeout(this.timer);
this.timer = null;
}
}
terminateSegmentRequest() {
this.downloadingSegmentId = null;
this.downloadingSegment = null;
this.cancelResponseTimeoutTimer();
}
}
exports.MediaPeer = MediaPeer;
},{"./stringly-typed-event-emitter":9,"buffer":16,"debug":"debug"}],7:[function(require,module,exports){
"use strict";
/**
* Copyright 2018 Novage LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const Debug = require("debug");
const Client = require("bittorrent-tracker/client");
const stringly_typed_event_emitter_1 = require("./stringly-typed-event-emitter");
const media_peer_1 = require("./media-peer");
const buffer_1 = require("buffer");
const sha1 = require("sha.js/sha1");
const index_1 = require("./index");
const PEER_PROTOCOL_VERSION = 2;
const PEER_ID_VERSION_STRING = index_1.version.replace(/\d*./g, v => `0${parseInt(v, 10) % 100}`.slice(-2)).slice(0, 4);
const PEER_ID_VERSION_PREFIX = `-WW${PEER_ID_VERSION_STRING}-`; // Using WebTorrent client ID in order to not be banned by websocket trackers
class PeerSegmentRequest {
constructor(peerId, segment) {
this.peerId = peerId;
this.segment = segment;
}
}