681 lines
18 KiB
JavaScript
681 lines
18 KiB
JavaScript
import MyWorker from './worker.js';
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//import localforage from 'localforage';
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import BroadcastChannel from 'broadcast-channel';
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import uuid4 from 'uuid/v4';
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import log from './logger.js';
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const sleep = ms => new Promise(res => setTimeout(res, ms));
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/**
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* TDLib in a browser
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*
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* TDLib can be compiled to WebAssembly or asm.js using Emscripten compiler and used in a browser from JavaScript.
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* This is a convenient wrapper for TDLib in a browser which controls TDLib instance creation, handles interaction
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* with TDLib and manages a filesystem for persistent TDLib data.
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* TDLib instance is created in a Web Worker to run it in a separate thread.
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* TdClient just sends queries to the Web Worker and receives updates and results from it.
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* <br>
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* <br>
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* Differences from the TDLib JSON API:<br>
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* 1. Added the update <code>updateFatalError error:string = Update;</code> which is sent whenever TDLib encounters a fatal error.<br>
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* 2. Added the method <code>setJsLogVerbosityLevel new_verbosity_level:string = Ok;</code>, which allows to change the verbosity level of tdweb logging.<br>
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* 3. Added the possibility to use blobs as input files via the constructor <code>inputFileBlob data:<JavaScript blob> = InputFile;</code>.<br>
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* 4. The class <code>filePart</code> contains data as a JavaScript blob instead of a base64-encoded string.<br>
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* 5. The methods <code>getStorageStatistics</code>, <code>getStorageStatisticsFast</code>, <code>optimizeStorage</code>, and <code>addProxy</code> are not supported.<br>
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* <br>
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*/
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class TdClient {
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/**
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* @callback TdClient~updateCallback
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* @param {Object} update The update.
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*/
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/**
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* Create TdClient.
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* @param {Object} options - Options for TDLib instance creation.
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* @param {TdClient~updateCallback} options.onUpdate - Callback for all incoming updates.
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* @param {string} [options.instanceName=tdlib] - Name of the TDLib instance. Currently, only one instance of TdClient with a given name is allowed. All but one instances with the same name will be automatically closed. Usually, the newest non-background instance is kept alive. Files will be stored in an IndexedDb table with the same name.
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* @param {boolean} [options.isBackground=false] - Pass true if the instance is opened from the background.
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* @param {string} [options.jsLogVerbosityLevel=info] - The initial verbosity level of the JavaScript part of the code (one of 'error', 'warning', 'info', 'log', 'debug').
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* @param {number} [options.logVerbosityLevel=2] - The initial verbosity level for the TDLib internal logging (0-1023).
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* @param {boolean} [options.useDatabase=true] - Pass false to use TDLib without database and secret chats. It significantly improves loading time, but some functionality is unavailable without the database.
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* @param {boolean} [options.readOnly=false] - For debug only. Pass true to open TDLib database in read-only mode
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* @param {string} [options.mode=auto] - For debug only. The type of the TDLib build to use. 'asmjs' for asm.js and 'wasm' for WebAssembly. If mode == 'auto' WebAbassembly is used if supported by browser; otherwise, asm.js is used.
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*/
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constructor(options) {
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log.setVerbosity(options.jsLogVerbosityLevel);
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this.worker = new MyWorker();
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this.worker.onmessage = e => {
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this.onResponse(e.data);
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};
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this.query_id = 0;
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this.query_callbacks = new Map();
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if ('onUpdate' in options) {
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this.onUpdate = options.onUpdate;
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delete options.onUpdate;
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}
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options.instanceName = options.instanceName || 'tdlib';
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this.fileManager = new FileManager(options.instanceName, this);
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this.worker.postMessage({ '@type': 'init', options: options });
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this.closeOtherClients(options);
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}
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/**
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* Send a query to TDLib.
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*
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* If the query contains the field '@extra', the same field will be added into the result.
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*
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* @param {Object} query - The query for TDLib. See the [td_api.tl]{@link https://github.com/tdlight-team/tdlight/blob/master/td/generate/scheme/td_api.tl} scheme or
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* the automatically generated [HTML documentation]{@link https://core.telegram.org/tdlib/docs/td__api_8h.html}
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* for a list of all available TDLib [methods]{@link https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1_function.html} and
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* [classes]{@link https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1_object.html}.
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* @returns {Promise} Promise object represents the result of the query.
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*/
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send(query) {
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return this.doSend(query, true);
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}
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/** @private */
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sendInternal(query) {
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return this.doSend(query, false);
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}
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/** @private */
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doSend(query, isExternal) {
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this.query_id++;
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if (query['@extra']) {
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query['@extra'] = {
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'@old_extra': JSON.parse(JSON.stringify(query['@extra'])),
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query_id: this.query_id
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};
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} else {
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query['@extra'] = {
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query_id: this.query_id
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};
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}
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if (query['@type'] === 'setJsLogVerbosityLevel') {
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log.setVerbosity(query.new_verbosity_level);
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}
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log.debug('send to worker: ', query);
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const res = new Promise((resolve, reject) => {
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this.query_callbacks.set(this.query_id, [resolve, reject]);
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});
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if (isExternal) {
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this.externalPostMessage(query);
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} else {
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this.worker.postMessage(query);
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}
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return res;
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}
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/** @private */
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externalPostMessage(query) {
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const unsupportedMethods = [
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'getStorageStatistics',
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'getStorageStatisticsFast',
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'optimizeStorage',
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'addProxy',
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'init',
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'start'
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];
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if (unsupportedMethods.includes(query['@type'])) {
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this.onResponse({
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'@type': 'error',
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'@extra': query['@extra'],
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code: 400,
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message: "Method '" + query['@type'] + "' is not supported"
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});
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return;
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}
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if (query['@type'] === 'readFile' || query['@type'] === 'readFilePart') {
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this.readFile(query);
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return;
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}
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if (query['@type'] === 'deleteFile') {
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this.deleteFile(query);
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return;
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}
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this.worker.postMessage(query);
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}
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/** @private */
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async readFile(query) {
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const response = await this.fileManager.readFile(query);
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this.onResponse(response);
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}
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/** @private */
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async deleteFile(query) {
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const response = this.fileManager.deleteFile(query);
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try {
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if (response.idb_key) {
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await this.sendInternal({
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'@type': 'deleteIdbKey',
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idb_key: response.idb_key
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});
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delete response.idb_key;
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}
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await this.sendInternal({
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'@type': 'deleteFile',
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file_id: query.file_id
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});
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} catch (e) {}
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this.onResponse(response);
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}
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/** @private */
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onResponse(response) {
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log.debug(
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'receive from worker: ',
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JSON.parse(
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JSON.stringify(response, (key, value) => {
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if (key === 'arr' || key === 'data') {
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return undefined;
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}
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return value;
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})
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)
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);
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// for FileManager
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response = this.prepareResponse(response);
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if ('@extra' in response) {
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const query_id = response['@extra'].query_id;
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const [resolve, reject] = this.query_callbacks.get(query_id);
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this.query_callbacks.delete(query_id);
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if ('@old_extra' in response['@extra']) {
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response['@extra'] = response['@extra']['@old_extra'];
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}
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if (resolve) {
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if (response['@type'] === 'error') {
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reject(response);
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} else {
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resolve(response);
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}
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}
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} else {
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if (response['@type'] === 'inited') {
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this.onInited();
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return;
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}
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if (response['@type'] === 'fsInited') {
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this.onFsInited();
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return;
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}
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if (
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response['@type'] === 'updateAuthorizationState' &&
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response.authorization_state['@type'] === 'authorizationStateClosed'
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) {
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this.onClosed();
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}
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this.onUpdate(response);
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}
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}
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/** @private */
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prepareFile(file) {
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return this.fileManager.registerFile(file);
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}
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/** @private */
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prepareResponse(response) {
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if (response['@type'] === 'file') {
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if (false && Math.random() < 0.1) {
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(async () => {
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log.warn('DELETE FILE', response.id);
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try {
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await this.send({ '@type': 'deleteFile', file_id: response.id });
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} catch (e) {}
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})();
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}
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return this.prepareFile(response);
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}
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for (const key in response) {
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const field = response[key];
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if (
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field &&
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typeof field === 'object' &&
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key !== 'data' &&
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key !== 'arr'
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) {
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response[key] = this.prepareResponse(field);
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}
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}
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return response;
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}
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/** @private */
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onBroadcastMessage(e) {
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//const message = e.data;
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const message = e;
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if (message.uid === this.uid) {
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log.info('ignore self broadcast message: ', message);
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return;
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}
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log.info('receive broadcast message: ', message);
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if (message.isBackground && !this.isBackground) {
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// continue
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} else if (
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(!message.isBackground && this.isBackground) ||
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message.timestamp > this.timestamp
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) {
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this.close();
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return;
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}
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if (message.state === 'closed') {
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this.waitSet.delete(message.uid);
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if (this.waitSet.size === 0) {
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log.info('onWaitSetEmpty');
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this.onWaitSetEmpty();
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this.onWaitSetEmpty = () => {};
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}
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} else {
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this.waitSet.add(message.uid);
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if (message.state !== 'closing') {
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this.postState();
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}
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}
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}
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/** @private */
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postState() {
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const state = {
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uid: this.uid,
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state: this.state,
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timestamp: this.timestamp,
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isBackground: this.isBackground
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};
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log.info('Post state: ', state);
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this.channel.postMessage(state);
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}
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/** @private */
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onWaitSetEmpty() {
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// nop
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}
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/** @private */
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onFsInited() {
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this.fileManager.init();
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}
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/** @private */
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onInited() {
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this.isInited = true;
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this.doSendStart();
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}
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/** @private */
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sendStart() {
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this.wantSendStart = true;
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this.doSendStart();
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}
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/** @private */
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doSendStart() {
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if (!this.isInited || !this.wantSendStart || this.state !== 'start') {
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return;
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}
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this.wantSendStart = false;
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this.state = 'active';
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const query = { '@type': 'start' };
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log.info('send to worker: ', query);
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this.worker.postMessage(query);
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}
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/** @private */
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onClosed() {
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this.isClosing = true;
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this.worker.terminate();
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log.info('worker is terminated');
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this.state = 'closed';
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this.postState();
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}
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/** @private */
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close() {
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if (this.isClosing) {
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return;
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}
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this.isClosing = true;
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log.info('close state: ', this.state);
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if (this.state === 'start') {
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this.onClosed();
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this.onUpdate({
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'@type': 'updateAuthorizationState',
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authorization_state: {
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'@type': 'authorizationStateClosed'
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}
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});
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return;
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}
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const query = { '@type': 'close' };
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log.info('send to worker: ', query);
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this.worker.postMessage(query);
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this.state = 'closing';
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this.postState();
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}
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/** @private */
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async closeOtherClients(options) {
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this.uid = uuid4();
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this.state = 'start';
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this.isBackground = !!options.isBackground;
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this.timestamp = Date.now();
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this.waitSet = new Set();
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log.info('close other clients');
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this.channel = new BroadcastChannel(options.instanceName, {
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webWorkerSupport: false
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});
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this.postState();
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this.channel.onmessage = message => {
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this.onBroadcastMessage(message);
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};
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await sleep(300);
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if (this.waitSet.size !== 0) {
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await new Promise(resolve => {
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this.onWaitSetEmpty = resolve;
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});
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}
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this.sendStart();
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}
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/** @private */
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onUpdate(update) {
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log.info('ignore onUpdate');
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//nop
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}
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}
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/** @private */
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class ListNode {
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constructor(value) {
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this.value = value;
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this.clear();
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}
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erase() {
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this.prev.connect(this.next);
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this.clear();
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}
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clear() {
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this.prev = this;
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this.next = this;
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}
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connect(other) {
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this.next = other;
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other.prev = this;
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}
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onUsed(other) {
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other.usedAt = Date.now();
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other.erase();
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other.connect(this.next);
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log.debug('LRU: used file_id: ', other.value);
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this.connect(other);
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}
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getLru() {
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if (this === this.next) {
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throw new Error('popLru from empty list');
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}
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return this.prev;
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}
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}
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/** @private */
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class FileManager {
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constructor(instanceName, client) {
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this.instanceName = instanceName;
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this.cache = new Map();
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this.pending = [];
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this.transaction_id = 0;
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this.totalSize = 0;
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this.lru = new ListNode(-1);
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this.client = client;
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}
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init() {
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this.idb = new Promise((resolve, reject) => {
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const request = indexedDB.open(this.instanceName);
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request.onsuccess = () => resolve(request.result);
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request.onerror = () => reject(request.error);
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});
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//this.store = localforage.createInstance({
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//name: instanceName
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//});
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this.isInited = true;
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}
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unload(info) {
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if (info.arr) {
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log.debug(
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'LRU: delete file_id: ',
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info.node.value,
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' with arr.length: ',
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info.arr.length
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);
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this.totalSize -= info.arr.length;
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delete info.arr;
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}
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if (info.node) {
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info.node.erase();
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delete info.node;
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}
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}
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registerFile(file) {
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if (file.idb_key || file.arr) {
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file.local.is_downloading_completed = true;
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} else {
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file.local.is_downloading_completed = false;
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}
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let info = {};
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const cached_info = this.cache.get(file.id);
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if (cached_info) {
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info = cached_info;
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} else {
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this.cache.set(file.id, info);
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}
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if (file.idb_key) {
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info.idb_key = file.idb_key;
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delete file.idb_key;
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} else {
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delete info.idb_key;
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}
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if (file.arr) {
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const now = Date.now();
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while (this.totalSize > 100000000) {
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const node = this.lru.getLru();
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// immunity for 60 seconds
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if (node.usedAt + 60 * 1000 > now) {
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break;
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}
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const lru_info = this.cache.get(node.value);
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this.unload(lru_info);
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}
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if (info.arr) {
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log.warn('Receive file.arr at least twice for the same file');
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this.totalSize -= info.arr.length;
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}
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info.arr = file.arr;
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delete file.arr;
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this.totalSize += info.arr.length;
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if (!info.node) {
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log.debug(
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'LRU: create file_id: ',
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file.id,
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' with arr.length: ',
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info.arr.length
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);
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info.node = new ListNode(file.id);
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}
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this.lru.onUsed(info.node);
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log.info('Total file.arr size: ', this.totalSize);
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}
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info.file = file;
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return file;
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}
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async flushLoad() {
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const pending = this.pending;
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this.pending = [];
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const idb = await this.idb;
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const transaction_id = this.transaction_id++;
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const read = idb
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.transaction(['keyvaluepairs'], 'readonly')
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.objectStore('keyvaluepairs');
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log.debug('Load group of files from idb', pending.length);
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for (const query of pending) {
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const request = read.get(query.key);
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request.onsuccess = event => {
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const blob = event.target.result;
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if (blob) {
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if (blob.size === 0) {
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|
log.error('Receive empty blob from db ', query.key);
|
|
}
|
|
query.resolve({ data: blob, transaction_id: transaction_id });
|
|
} else {
|
|
query.reject();
|
|
}
|
|
};
|
|
request.onerror = () => query.reject(request.error);
|
|
}
|
|
}
|
|
|
|
load(key, resolve, reject) {
|
|
if (this.pending.length === 0) {
|
|
setTimeout(() => {
|
|
this.flushLoad();
|
|
}, 1);
|
|
}
|
|
this.pending.push({ key: key, resolve: resolve, reject: reject });
|
|
}
|
|
|
|
async doLoadFull(info) {
|
|
if (info.arr) {
|
|
return { data: new Blob([info.arr]), transaction_id: -1 };
|
|
}
|
|
if (info.idb_key) {
|
|
const idb_key = info.idb_key;
|
|
//return this.store.getItem(idb_key);
|
|
return await new Promise((resolve, reject) => {
|
|
this.load(idb_key, resolve, reject);
|
|
});
|
|
}
|
|
throw new Error('File is not loaded');
|
|
}
|
|
async doLoad(info, offset, size) {
|
|
if (!info.arr && !info.idb_key && info.file.local.path) {
|
|
try {
|
|
const count = await this.client.sendInternal({
|
|
'@type': 'getFileDownloadedPrefixSize',
|
|
file_id: info.file.id,
|
|
offset: offset
|
|
});
|
|
//log.error(count, size);
|
|
if (!size) {
|
|
size = count.count;
|
|
} else if (size > count.count) {
|
|
throw new Error('File not loaded yet');
|
|
}
|
|
const res = await this.client.sendInternal({
|
|
'@type': 'readFilePart',
|
|
path: info.file.local.path,
|
|
offset: offset,
|
|
count: size
|
|
});
|
|
res.data = new Blob([res.data]);
|
|
res.transaction_id = -2;
|
|
//log.error(res);
|
|
return res;
|
|
} catch (e) {
|
|
log.info('readFilePart failed', info, offset, size, e);
|
|
}
|
|
}
|
|
|
|
const res = await this.doLoadFull(info);
|
|
|
|
// return slice(size, offset + size)
|
|
const data_size = res.data.size;
|
|
if (!size) {
|
|
size = data_size;
|
|
}
|
|
if (offset > data_size) {
|
|
offset = data_size;
|
|
}
|
|
res.data = res.data.slice(offset, offset + size);
|
|
return res;
|
|
}
|
|
|
|
doDelete(info) {
|
|
this.unload(info);
|
|
return info.idb_key;
|
|
}
|
|
|
|
async readFile(query) {
|
|
try {
|
|
if (!this.isInited) {
|
|
throw new Error('FileManager is not inited');
|
|
}
|
|
const info = this.cache.get(query.file_id);
|
|
if (!info) {
|
|
throw new Error('File is not loaded');
|
|
}
|
|
if (info.node) {
|
|
this.lru.onUsed(info.node);
|
|
}
|
|
query.offset = query.offset || 0;
|
|
query.size = query.count || query.size || 0;
|
|
const response = await this.doLoad(info, query.offset, query.size);
|
|
return {
|
|
'@type': 'filePart',
|
|
'@extra': query['@extra'],
|
|
data: response.data,
|
|
transaction_id: response.transaction_id
|
|
};
|
|
} catch (e) {
|
|
return {
|
|
'@type': 'error',
|
|
'@extra': query['@extra'],
|
|
code: 400,
|
|
message: e
|
|
};
|
|
}
|
|
}
|
|
|
|
deleteFile(query) {
|
|
const res = {
|
|
'@type': 'ok',
|
|
'@extra': query['@extra']
|
|
};
|
|
try {
|
|
if (!this.isInited) {
|
|
throw new Error('FileManager is not inited');
|
|
}
|
|
const info = this.cache.get(query.file_id);
|
|
if (!info) {
|
|
throw new Error('File is not loaded');
|
|
}
|
|
const idb_key = this.doDelete(info);
|
|
if (idb_key) {
|
|
res.idb_key = idb_key;
|
|
}
|
|
} catch (e) {}
|
|
return res;
|
|
}
|
|
}
|
|
|
|
export default TdClient;
|