lighthouse/core/computed/network-analysis.js

Automated auditing, performance metrics, and best practices for the web.

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import log from 'lighthouse-logger';

import * as Lantern from '../lib/lantern/lantern.js';
import {makeComputedArtifact} from './computed-artifact.js';
import {NetworkRecords} from './network-records.js';

class NetworkAnalysis {
  /**
   * @param {LH.DevtoolsLog} devtoolsLog
   * @param {LH.Artifacts.ComputedContext} context
   * @return {Promise<LH.Artifacts.NetworkAnalysis>}
   */
  static async compute_(devtoolsLog, context) {
    const records = await NetworkRecords.request(devtoolsLog, context);
    const analysis = Lantern.Core.NetworkAnalyzer.analyze(records);
    if (!analysis) {
      log.error('NetworkAnalysis', 'Network analysis failed due to lack of transfer data');
      return {
        throughput: 0,
        rtt: Number.POSITIVE_INFINITY,
        additionalRttByOrigin: new Map(),
        serverResponseTimeByOrigin: new Map(),
      };
    }
    return analysis;
  }
}

const NetworkAnalysisComputed = makeComputedArtifact(NetworkAnalysis, null);
export {NetworkAnalysisComputed as NetworkAnalysis};