83 lines
2.3 KiB
TypeScript
83 lines
2.3 KiB
TypeScript
/**
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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 { helper, assert } from './helper';
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import { CDPSession } from './Connection';
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interface TracingOptions {
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path?: string;
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screenshots?: boolean;
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categories?: string[];
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}
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export class Tracing {
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_client: CDPSession;
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_recording = false;
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_path = '';
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constructor(client: CDPSession) {
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this._client = client;
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}
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async start(options: TracingOptions = {}): Promise<void> {
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assert(
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!this._recording,
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'Cannot start recording trace while already recording trace.'
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);
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const defaultCategories = [
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'-*',
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'devtools.timeline',
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'v8.execute',
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'disabled-by-default-devtools.timeline',
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'disabled-by-default-devtools.timeline.frame',
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'toplevel',
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'blink.console',
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'blink.user_timing',
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'latencyInfo',
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'disabled-by-default-devtools.timeline.stack',
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'disabled-by-default-v8.cpu_profiler',
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'disabled-by-default-v8.cpu_profiler.hires',
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];
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const {
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path = null,
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screenshots = false,
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categories = defaultCategories,
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} = options;
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if (screenshots) categories.push('disabled-by-default-devtools.screenshot');
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this._path = path;
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this._recording = true;
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await this._client.send('Tracing.start', {
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transferMode: 'ReturnAsStream',
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categories: categories.join(','),
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});
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}
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async stop(): Promise<Buffer> {
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let fulfill: (value: Buffer) => void;
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const contentPromise = new Promise<Buffer>((x) => (fulfill = x));
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this._client.once('Tracing.tracingComplete', (event) => {
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helper
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.readProtocolStream(this._client, event.stream, this._path)
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.then(fulfill);
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});
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await this._client.send('Tracing.end');
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this._recording = false;
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return contentPromise;
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}
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}
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