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https://github.com/puppeteer/puppeteer
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6c1c3a0c45
This patch starts handling unserializable objects by returning their description. Fixes #86.
97 lines
3.0 KiB
JavaScript
97 lines
3.0 KiB
JavaScript
/**
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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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class Helper {
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/**
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* @param {function()} 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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return `(${fun})(${args.map(x => JSON.stringify(x)).join(',')})`;
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}
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/**
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* @param {!Connection} client
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* @param {!Object} exceptionDetails
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* @return {string}
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*/
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static async getExceptionMessage(client, exceptionDetails) {
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let message = '';
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let exception = exceptionDetails.exception;
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if (exception) {
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let response = await client.send('Runtime.callFunctionOn', {
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objectId: exception.objectId,
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functionDeclaration: 'function() { return this.message; }',
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returnByValue: true,
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});
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message = response.result.value;
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} else {
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message = exceptionDetails.text;
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}
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if (exceptionDetails.stackTrace) {
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for (let callframe of exceptionDetails.stackTrace.callFrames) {
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let location = callframe.url + ':' + callframe.lineNumber + ':' + callframe.columnNumber;
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let 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 {!Connection} client
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* @param {!Object} remoteObject
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* @return {!Object}
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*/
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static async serializeRemoteObject(client, remoteObject) {
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if (remoteObject.unserializableValue) {
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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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if (!remoteObject.objectId)
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return remoteObject.value;
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try {
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let response = await client.send('Runtime.callFunctionOn', {
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objectId: remoteObject.objectId,
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functionDeclaration: 'function() { return this; }',
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returnByValue: true,
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});
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return response.result.value;
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} catch (e) {
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// Return description for unserializable object, e.g. 'window'.
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return remoteObject.description;
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} finally {
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client.send('Runtime.releaseObject', {objectId: remoteObject.objectId}).catch(e => {
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// While we were serializing object, the page might've navigated.
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});
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}
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}
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}
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module.exports = Helper;
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