dom/cache/test/mochitest/test_cache_shrink.html
author Sandor Molnar <smolnar@mozilla.com>
Thu, 16 Sep 2021 15:52:56 +0300
changeset 592130 fd6f4fa5ed1806add34bf8995eed2d4baf22381b
parent 546261 f9b28a22bc19f092615405034733ede00c2c3f4d
permissions -rw-r--r--
Backed out changeset 2d49d73f38aa (bug 1727514) for causing frequent crashes. a=backout

<!-- Any copyright is dedicated to the Public Domain.
   - http://creativecommons.org/publicdomain/zero/1.0/ -->
<!DOCTYPE HTML>
<html>
<head>
  <title>Test Cache with QuotaManager Restart</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="large_url_list.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script class="testbody" type="text/javascript">
function setupTestIframe() {
  return new Promise(function(resolve) {
    var iframe = document.createElement("iframe");
    iframe.src = "empty.html";
    iframe.onload = function() {
      window.caches = iframe.contentWindow.caches;
      resolve();
    };
    document.body.appendChild(iframe);
  });
}

function clearStorage() {
  return new Promise(function(resolve, reject) {
    var qms = SpecialPowers.Services.qms;
    var principal = SpecialPowers.wrap(document).nodePrincipal;
    var request = qms.clearStoragesForPrincipal(principal);
    var cb = SpecialPowers.wrapCallback(resolve);
    request.callback = cb;
  });
}

function storageUsage() {
  return new Promise(function(resolve, reject) {
    var qms = SpecialPowers.Services.qms;
    var principal = SpecialPowers.wrap(document).nodePrincipal;
    var cb = SpecialPowers.wrapCallback(function(request) {
      var result = request.result;
      resolve(result.usage);
    });
    qms.getUsageForPrincipal(principal, cb);
  });
}

function resetStorage() {
  return new Promise(function(resolve, reject) {
    var qms = SpecialPowers.Services.qms;
    var request = qms.reset();
    var cb = SpecialPowers.wrapCallback(resolve);
    request.callback = cb;
  });
}

function gc() {
  return new Promise(function(resolve, reject) {
    SpecialPowers.exactGC(resolve);
  });
}

SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv({
  "set": [["dom.caches.enabled", true],
          ["dom.caches.testing.enabled", true],
          ["dom.quotaManager.testing", true]],
}, function() {
  var name = "foo";
  var cache = null;
  var initialUsage = 0;
  var fullUsage = 0;
  var endUsage = 0;
  // start from a fresh origin directory so other tests do not influence our
  // results
  setupTestIframe().then(function() {
    return clearStorage();
  }).then(function() {
    return storageUsage();
  }).then(function(usage) {
    is(0, usage, "disk usage should be zero to start");
    return caches.open(name);
  }).then(function(c) {
    cache = c;
    return storageUsage();
  }).then(function(usage) {
    initialUsage = usage;
    return Promise.all(largeUrlList.map(function(url) {
      return cache.put(new Request(url), new Response());
    }));
  }).then(function() {
    return cache.keys();
  }).then(function(keyList) {
    is(keyList.length, largeUrlList.length, "Large URL list is stored in cache");
    cache = null;
    // Ensure the Cache DOM object is gone before proceeding.  If its alive
    // it will keep the related entries on-disk as well.
    return gc();
  }).then(function() {
    // reset the quota manager storage to ensure the DB connection is flushed
    return resetStorage();
  }).then(function() {
    return storageUsage();
  }).then(function(usage) {
    fullUsage = usage;
    ok(fullUsage > initialUsage, "disk usage should have grown");
    return caches.delete(name);
  }).then(function(result) {
    ok(result, "cache should be deleted");
    // This is a bit superfluous, but its necessary to make sure the Cache is
    // fully deleted before we proceed.  The deletion actually takes place in
    // two async steps.  We don't want to resetStorage() until the second step
    // has taken place.  This extra Cache operation ensure that all the
    // runnables have been flushed through the threads, etc.
    return caches.has(name);
  }).then(function(result) {
    ok(!result, "cache should not exist in storage");
    // reset the quota manager storage to ensure the DB connection is flushed
    return resetStorage();
  }).then(function() {
    return storageUsage();
  }).then(function(usage) {
    endUsage = usage;
    dump("### ### initial:" + initialUsage + ", full:" + fullUsage +
         ", end:" + endUsage + "\n");
    ok(endUsage < (fullUsage / 2), "disk usage should have shrank significantly");
    ok(endUsage > initialUsage, "disk usage should not shrink back to orig size");
    SimpleTest.finish();
  });
});
</script>
</body>
</html>