devtools/server/tests/chrome/inspector-delay-image-response.sjs

   1 /**
   2  * Adapted from https://searchfox.org/mozilla-central/source/layout/reftests/backgrounds/delay-image-response.sjs
   3  */
   4 "use strict";
   5
   6 // A 1x1 PNG image.
   7 // Source: https://commons.wikimedia.org/wiki/File:1x1.png (Public Domain)
   8 const IMAGE = atob(
   9   "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAA" +
  10     "ACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII="
  11 );
  12
  13 // To avoid GC.
  14 let timer = null;
  15
  16 function handleRequest(request, response) {
  17   const query = {};
  18   request.queryString.split("&").forEach(function (val) {
  19     const [name, value] = val.split("=");
  20     query[name] = unescape(value);
  21   });
  22
  23   response.setStatusLine(request.httpVersion, 200, "OK");
  24   response.setHeader("Content-Type", "image/png", false);
  25
  26   // If there is no delay, we write the image and leave.
  27   if (!("delay" in query)) {
  28     response.write(IMAGE);
  29     return;
  30   }
  31
  32   // If there is a delay, we create a timer which, when it fires, will write
  33   // image and leave.
  34   response.processAsync();
  35   const nsITimer = Ci.nsITimer;
  36
  37   timer = Cc["@mozilla.org/timer;1"].createInstance(nsITimer);
  38   timer.initWithCallback(
  39     function () {
  40       response.write(IMAGE);
  41       response.finish();
  42     },
  43     query.delay,
  44     nsITimer.TYPE_ONE_SHOT
  45   );
  46 }