mirror of
https://github.com/puppeteer/puppeteer
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chore: migrate src/helper to typescript (#5689)
This PR migrates the helper module to TypeScript. It's a bit of a bigger change than others because I decided to move away from the helper class with static methods and move towards a simpler set up where the module is a bunch of functions. I still expose them under the `helper` namespace to avoid this being a big change - we can update that later when we migrate to ESM. We do have to do some unfortunate wrangling of the promisify function. Ideally I'd like to rely on the Node one (and the type defs) but that doesn't work in Browserify land. I've stuck with the promisify in `helper.ts` but pulled it into its own module to enable me to leave a comment clarifying why we use it and the context. We can solve this with a better web bundling story but that work is lower priority right now than getting the `src/` directory into TypeScript.
This commit is contained in:
Jack Franklin
GitHub
parent
c32b049e18
commit
4134b540ca
290
src/helper.js
290
src/helper.js
@ -1,290 +0,0 @@
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/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const {TimeoutError} = require('./Errors');
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const debugError = require('debug')(`puppeteer:error`);
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const fs = require('fs');
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class Helper {
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/**
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* @param {Function|string} fun
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* @param {!Array<*>} args
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* @return {string}
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*/
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static evaluationString(fun, ...args) {
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if (Helper.isString(fun)) {
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assert(args.length === 0, 'Cannot evaluate a string with arguments');
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return /** @type {string} */ (fun);
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}
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return `(${fun})(${args.map(serializeArgument).join(',')})`;
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/**
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* @param {*} arg
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* @return {string}
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*/
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function serializeArgument(arg) {
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if (Object.is(arg, undefined))
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return 'undefined';
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return JSON.stringify(arg);
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}
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}
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/**
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* @param {!Protocol.Runtime.ExceptionDetails} exceptionDetails
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* @return {string}
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*/
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static getExceptionMessage(exceptionDetails) {
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if (exceptionDetails.exception)
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return exceptionDetails.exception.description || exceptionDetails.exception.value;
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let message = exceptionDetails.text;
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if (exceptionDetails.stackTrace) {
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for (const callframe of exceptionDetails.stackTrace.callFrames) {
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const location = callframe.url + ':' + callframe.lineNumber + ':' + callframe.columnNumber;
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const functionName = callframe.functionName || '<anonymous>';
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message += `\n at ${functionName} (${location})`;
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}
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}
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return message;
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}
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/**
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* @param {!Protocol.Runtime.RemoteObject} remoteObject
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* @return {*}
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*/
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static valueFromRemoteObject(remoteObject) {
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assert(!remoteObject.objectId, 'Cannot extract value when objectId is given');
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if (remoteObject.unserializableValue) {
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if (remoteObject.type === 'bigint' && typeof BigInt !== 'undefined')
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return BigInt(remoteObject.unserializableValue.replace('n', ''));
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switch (remoteObject.unserializableValue) {
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case '-0':
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return -0;
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case 'NaN':
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return NaN;
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case 'Infinity':
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return Infinity;
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case '-Infinity':
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return -Infinity;
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default:
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throw new Error('Unsupported unserializable value: ' + remoteObject.unserializableValue);
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}
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}
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return remoteObject.value;
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}
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/**
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* @param {!Puppeteer.CDPSession} client
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* @param {!Protocol.Runtime.RemoteObject} remoteObject
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*/
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static async releaseObject(client, remoteObject) {
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if (!remoteObject.objectId)
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return;
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await client.send('Runtime.releaseObject', {objectId: remoteObject.objectId}).catch(error => {
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// Exceptions might happen in case of a page been navigated or closed.
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// Swallow these since they are harmless and we don't leak anything in this case.
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debugError(error);
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});
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}
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/**
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* @param {!Object} classType
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*/
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static installAsyncStackHooks(classType) {
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for (const methodName of Reflect.ownKeys(classType.prototype)) {
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const method = Reflect.get(classType.prototype, methodName);
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if (methodName === 'constructor' || typeof methodName !== 'string' || methodName.startsWith('_') || typeof method !== 'function' || method.constructor.name !== 'AsyncFunction')
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continue;
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Reflect.set(classType.prototype, methodName, function(...args) {
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const syncStack = {};
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Error.captureStackTrace(syncStack);
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return method.call(this, ...args).catch(e => {
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const stack = syncStack.stack.substring(syncStack.stack.indexOf('\n') + 1);
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const clientStack = stack.substring(stack.indexOf('\n'));
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if (e instanceof Error && e.stack && !e.stack.includes(clientStack))
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e.stack += '\n -- ASYNC --\n' + stack;
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throw e;
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});
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});
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}
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}
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/**
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* @param {!NodeJS.EventEmitter} emitter
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* @param {(string|symbol)} eventName
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* @param {function(?):void} handler
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* @return {{emitter: !NodeJS.EventEmitter, eventName: (string|symbol), handler: function(?)}}
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*/
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static addEventListener(emitter, eventName, handler) {
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emitter.on(eventName, handler);
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return { emitter, eventName, handler };
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}
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/**
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* @param {!Array<{emitter: !NodeJS.EventEmitter, eventName: (string|symbol), handler: function(?):void}>} listeners
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*/
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static removeEventListeners(listeners) {
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for (const listener of listeners)
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listener.emitter.removeListener(listener.eventName, listener.handler);
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listeners.length = 0;
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}
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/**
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* @param {!Object} obj
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* @return {boolean}
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*/
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static isString(obj) {
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return typeof obj === 'string' || obj instanceof String;
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}
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/**
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* @param {!Object} obj
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* @return {boolean}
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*/
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static isNumber(obj) {
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return typeof obj === 'number' || obj instanceof Number;
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}
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/**
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* @param {function} nodeFunction
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* @return {function}
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*/
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static promisify(nodeFunction) {
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function promisified(...args) {
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return new Promise((resolve, reject) => {
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function callback(err, ...result) {
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if (err)
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return reject(err);
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if (result.length === 1)
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return resolve(result[0]);
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return resolve(result);
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}
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nodeFunction.call(null, ...args, callback);
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});
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}
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return promisified;
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}
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/**
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* @param {!NodeJS.EventEmitter} emitter
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* @param {(string|symbol)} eventName
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* @param {function} predicate
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* @param {number} timeout
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* @param {!Promise<!Error>} abortPromise
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* @return {!Promise}
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*/
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static async waitForEvent(emitter, eventName, predicate, timeout, abortPromise) {
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let eventTimeout, resolveCallback, rejectCallback;
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const promise = new Promise((resolve, reject) => {
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resolveCallback = resolve;
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rejectCallback = reject;
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});
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const listener = Helper.addEventListener(emitter, eventName, event => {
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if (!predicate(event))
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return;
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resolveCallback(event);
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});
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if (timeout) {
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eventTimeout = setTimeout(() => {
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rejectCallback(new TimeoutError('Timeout exceeded while waiting for event'));
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}, timeout);
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}
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function cleanup() {
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Helper.removeEventListeners([listener]);
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clearTimeout(eventTimeout);
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}
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const result = await Promise.race([promise, abortPromise]).then(r => {
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cleanup();
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return r;
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}, e => {
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cleanup();
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throw e;
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});
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if (result instanceof Error)
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throw result;
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return result;
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}
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/**
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* @template T
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* @param {!Promise<T>} promise
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* @param {string} taskName
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* @param {number} timeout
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* @return {!Promise<T>}
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*/
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static async waitWithTimeout(promise, taskName, timeout) {
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let reject;
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const timeoutError = new TimeoutError(`waiting for ${taskName} failed: timeout ${timeout}ms exceeded`);
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const timeoutPromise = new Promise((resolve, x) => reject = x);
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let timeoutTimer = null;
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if (timeout)
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timeoutTimer = setTimeout(() => reject(timeoutError), timeout);
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try {
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return await Promise.race([promise, timeoutPromise]);
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} finally {
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if (timeoutTimer)
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clearTimeout(timeoutTimer);
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}
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}
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/**
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* @param {!Puppeteer.CDPSession} client
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* @param {string} handle
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* @param {?string} path
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* @return {!Promise<!Buffer>}
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*/
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static async readProtocolStream(client, handle, path) {
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let eof = false;
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let file;
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if (path)
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file = await openAsync(path, 'w');
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const bufs = [];
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while (!eof) {
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const response = await client.send('IO.read', {handle});
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eof = response.eof;
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const buf = Buffer.from(response.data, response.base64Encoded ? 'base64' : undefined);
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bufs.push(buf);
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if (path)
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await writeAsync(file, buf);
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}
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if (path)
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await closeAsync(file);
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await client.send('IO.close', {handle});
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let resultBuffer = null;
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try {
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resultBuffer = Buffer.concat(bufs);
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} finally {
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return resultBuffer;
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}
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}
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}
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const openAsync = Helper.promisify(fs.open);
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const writeAsync = Helper.promisify(fs.write);
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const closeAsync = Helper.promisify(fs.close);
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/**
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* @param {*} value
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* @param {string=} message
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*/
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function assert(value, message) {
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if (!value)
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throw new Error(message);
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}
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module.exports = {
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helper: Helper,
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assert,
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debugError
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};
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232
src/helper.ts
Normal file
232
src/helper.ts
Normal file
@ -0,0 +1,232 @@
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/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import Errors = require('./Errors');
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import debug = require('debug');
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const debugError = debug('puppeteer:error');
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import fs = require('fs');
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import promisify = require('./promisify');
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const {TimeoutError} = Errors;
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const openAsync = promisify(fs.open);
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const writeAsync = promisify(fs.write);
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const closeAsync = promisify(fs.close);
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function assert(value: unknown, message?: string): void {
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if (!value)
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throw new Error(message);
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}
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interface AnyClass {
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prototype: object;
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}
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function getExceptionMessage(exceptionDetails: Protocol.Runtime.ExceptionDetails): string {
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if (exceptionDetails.exception)
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return exceptionDetails.exception.description || exceptionDetails.exception.value;
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let message = exceptionDetails.text;
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if (exceptionDetails.stackTrace) {
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for (const callframe of exceptionDetails.stackTrace.callFrames) {
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const location = callframe.url + ':' + callframe.lineNumber + ':' + callframe.columnNumber;
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const functionName = callframe.functionName || '<anonymous>';
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message += `\n at ${functionName} (${location})`;
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}
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}
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return message;
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}
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function valueFromRemoteObject(remoteObject: Protocol.Runtime.RemoteObject): unknown {
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assert(!remoteObject.objectId, 'Cannot extract value when objectId is given');
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if (remoteObject.unserializableValue) {
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if (remoteObject.type === 'bigint' && typeof BigInt !== 'undefined')
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return BigInt(remoteObject.unserializableValue.replace('n', ''));
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switch (remoteObject.unserializableValue) {
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case '-0':
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return -0;
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case 'NaN':
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return NaN;
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case 'Infinity':
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return Infinity;
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case '-Infinity':
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return -Infinity;
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default:
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throw new Error('Unsupported unserializable value: ' + remoteObject.unserializableValue);
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}
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}
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return remoteObject.value;
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}
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async function releaseObject(client: Puppeteer.CDPSession, remoteObject: Protocol.Runtime.RemoteObject): Promise<void> {
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if (!remoteObject.objectId)
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return;
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await client.send('Runtime.releaseObject', {objectId: remoteObject.objectId}).catch(error => {
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// Exceptions might happen in case of a page been navigated or closed.
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// Swallow these since they are harmless and we don't leak anything in this case.
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debugError(error);
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});
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}
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function installAsyncStackHooks(classType: AnyClass): void {
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for (const methodName of Reflect.ownKeys(classType.prototype)) {
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const method = Reflect.get(classType.prototype, methodName);
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if (methodName === 'constructor' || typeof methodName !== 'string' || methodName.startsWith('_') || typeof method !== 'function' || method.constructor.name !== 'AsyncFunction')
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continue;
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Reflect.set(classType.prototype, methodName, function(...args) {
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const syncStack = {
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stack: ''
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};
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Error.captureStackTrace(syncStack);
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return method.call(this, ...args).catch(e => {
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const stack = syncStack.stack.substring(syncStack.stack.indexOf('\n') + 1);
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const clientStack = stack.substring(stack.indexOf('\n'));
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if (e instanceof Error && e.stack && !e.stack.includes(clientStack))
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e.stack += '\n -- ASYNC --\n' + stack;
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throw e;
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});
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});
|
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}
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}
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||||
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function addEventListener(emitter: NodeJS.EventEmitter, eventName: string|symbol, handler: (...args: any[]) => void): { emitter: NodeJS.EventEmitter; eventName: string|symbol; handler: (...args: any[]) => void} {
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emitter.on(eventName, handler);
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return { emitter, eventName, handler };
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}
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||||
function removeEventListeners(listeners: Array<{emitter: NodeJS.EventEmitter; eventName: string|symbol; handler: (...args: any[]) => void}>): void {
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for (const listener of listeners)
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listener.emitter.removeListener(listener.eventName, listener.handler);
|
||||
listeners.length = 0;
|
||||
}
|
||||
|
||||
function isString(obj: unknown): obj is string {
|
||||
return typeof obj === 'string' || obj instanceof String;
|
||||
}
|
||||
|
||||
function isNumber(obj: unknown): obj is number {
|
||||
return typeof obj === 'number' || obj instanceof Number;
|
||||
}
|
||||
|
||||
async function waitForEvent<T extends any>(emitter: NodeJS.EventEmitter, eventName: string|symbol, predicate: (event: T) => boolean, timeout: number, abortPromise: Promise<Error>): Promise<T> {
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let eventTimeout, resolveCallback, rejectCallback;
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||||
const promise = new Promise<T>((resolve, reject) => {
|
||||
resolveCallback = resolve;
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||||
rejectCallback = reject;
|
||||
});
|
||||
const listener = addEventListener(emitter, eventName, event => {
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||||
if (!predicate(event))
|
||||
return;
|
||||
resolveCallback(event);
|
||||
});
|
||||
if (timeout) {
|
||||
eventTimeout = setTimeout(() => {
|
||||
rejectCallback(new TimeoutError('Timeout exceeded while waiting for event'));
|
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}, timeout);
|
||||
}
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||||
function cleanup(): void {
|
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removeEventListeners([listener]);
|
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clearTimeout(eventTimeout);
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||||
}
|
||||
const result = await Promise.race([promise, abortPromise]).then(r => {
|
||||
cleanup();
|
||||
return r;
|
||||
}, e => {
|
||||
cleanup();
|
||||
throw e;
|
||||
});
|
||||
if (result instanceof Error)
|
||||
throw result;
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
function evaluationString(fun: Function | string, ...args: unknown[]): string {
|
||||
if (isString(fun)) {
|
||||
assert(args.length === 0, 'Cannot evaluate a string with arguments');
|
||||
return fun;
|
||||
}
|
||||
|
||||
function serializeArgument(arg: unknown): string {
|
||||
if (Object.is(arg, undefined))
|
||||
return 'undefined';
|
||||
return JSON.stringify(arg);
|
||||
}
|
||||
|
||||
return `(${fun})(${args.map(serializeArgument).join(',')})`;
|
||||
}
|
||||
|
||||
async function waitWithTimeout<T extends any>(promise: Promise<T>, taskName: string, timeout: number): Promise<T> {
|
||||
let reject;
|
||||
const timeoutError = new TimeoutError(`waiting for ${taskName} failed: timeout ${timeout}ms exceeded`);
|
||||
const timeoutPromise = new Promise<T>((resolve, x) => reject = x);
|
||||
let timeoutTimer = null;
|
||||
if (timeout)
|
||||
timeoutTimer = setTimeout(() => reject(timeoutError), timeout);
|
||||
try {
|
||||
return await Promise.race([promise, timeoutPromise]);
|
||||
} finally {
|
||||
if (timeoutTimer)
|
||||
clearTimeout(timeoutTimer);
|
||||
}
|
||||
}
|
||||
|
||||
async function readProtocolStream(client: Puppeteer.CDPSession, handle: string, path?: string): Promise<Buffer> {
|
||||
let eof = false;
|
||||
let file;
|
||||
if (path)
|
||||
file = await openAsync(path, 'w');
|
||||
const bufs = [];
|
||||
while (!eof) {
|
||||
const response = await client.send('IO.read', {handle});
|
||||
eof = response.eof;
|
||||
const buf = Buffer.from(response.data, response.base64Encoded ? 'base64' : undefined);
|
||||
bufs.push(buf);
|
||||
if (path)
|
||||
await writeAsync(file, buf);
|
||||
}
|
||||
if (path)
|
||||
await closeAsync(file);
|
||||
await client.send('IO.close', {handle});
|
||||
let resultBuffer = null;
|
||||
try {
|
||||
resultBuffer = Buffer.concat(bufs);
|
||||
} finally {
|
||||
return resultBuffer;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
export = {
|
||||
helper: {
|
||||
promisify,
|
||||
evaluationString,
|
||||
readProtocolStream,
|
||||
waitWithTimeout,
|
||||
waitForEvent,
|
||||
isString,
|
||||
isNumber,
|
||||
addEventListener,
|
||||
removeEventListeners,
|
||||
valueFromRemoteObject,
|
||||
installAsyncStackHooks,
|
||||
getExceptionMessage,
|
||||
releaseObject,
|
||||
},
|
||||
assert,
|
||||
debugError
|
||||
};
|
||||
51
src/promisify.ts
Normal file
51
src/promisify.ts
Normal file
@ -0,0 +1,51 @@
|
||||
/**
|
||||
* Copyright 2020 Google Inc. All rights reserved.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
|
||||
/* This is a poor typed implementation of promisify. It would be much
|
||||
* nicer to use util.promisfy from Node but we need it to work in the
|
||||
* browser as we bundle via Browserify and Browserify doesn't seem to
|
||||
* bundle the util module when it does. The long term goal for our web
|
||||
* bundle isn't to use Browserify but something more modern (probably
|
||||
* Rollup?) and so rather than delay the TypeScript migration with a big
|
||||
* tangent around web bundling we'll use this for now and loop back once
|
||||
* src/ is 100% TypeScript.
|
||||
*
|
||||
* TODO (jacktfranklin@) swap this for util.promisify so we get much
|
||||
* better type support from TypeScript
|
||||
*/
|
||||
|
||||
type CallbackFunc = (...args: any[]) => void;
|
||||
type PromisifiedFunc = (...args: any[]) => Promise<any>;
|
||||
|
||||
function promisify<ResultType extends any>(func: CallbackFunc): PromisifiedFunc {
|
||||
function promisified(...args): Promise<ResultType | ResultType[]> {
|
||||
return new Promise((resolve, reject) => {
|
||||
function callback(err: Error | null, ...result: ResultType[]): void {
|
||||
if (err)
|
||||
return reject(err);
|
||||
if (result.length === 1)
|
||||
return resolve(result[0]);
|
||||
return resolve(result);
|
||||
}
|
||||
func.call(null, ...args, callback);
|
||||
});
|
||||
}
|
||||
|
||||
return promisified;
|
||||
}
|
||||
|
||||
export = promisify;
|
||||
Loading…
Reference in New Issue
Block a user