fetchFileWithCaching.js — react Source File

Source Code

/* global chrome */

import {normalizeUrlIfValid} from 'react-devtools-shared/src/utils';
import {__DEBUG__} from 'react-devtools-shared/src/constants';

let debugIDCounter = 0;

const debugLog = (...args) => {
  if (__DEBUG__) {
    console.log(...args);
  }
};

const fetchFromNetworkCache = (url, resolve, reject) => {
  // Debug ID allows us to avoid re-logging (potentially long) URL strings below,
  // while also still associating (potentially) interleaved logs with the original request.
  let debugID = null;

  if (__DEBUG__) {
    debugID = debugIDCounter++;
    debugLog(`[main] fetchFromNetworkCache(${debugID})`, url);
  }

  chrome.devtools.network.getHAR(harLog => {
    for (let i = 0; i < harLog.entries.length; i++) {
      const entry = harLog.entries[i];
      if (url !== entry.request.url) {
        continue;
      }

      debugLog(
        `[main] fetchFromNetworkCache(${debugID}) Found matching URL in HAR`,
        url,
      );

      if (entry.getContent != null) {
        entry.getContent(content => {
          if (content) {
            debugLog(
              `[main] fetchFromNetworkCache(${debugID}) Content retrieved`,
            );

            resolve(content);
          } else {
            debugLog(
              `[main] fetchFromNetworkCache(${debugID}) Invalid content returned by getContent()`,
              content,
            );

            // Edge case where getContent() returned null; fall back to fetch.
            fetchFromPage(url, resolve, reject);
          }
        });
      } else {
        const content = entry.response.content.text;

        if (content != null) {
          debugLog(
            `[main] fetchFromNetworkCache(${debugID}) Content retrieved`,
          );
// ... (99 more lines)