gecko-dev/netwerk/test/unit/test_doomentry.js

/**
 * Test for nsICacheStorage.asyncDoomURI().
 * It tests dooming
 *   - an existent inactive entry
 *   - a non-existent inactive entry
 *   - an existent active entry
 */

function doom(url, callback)
{
  get_cache_service()
      .diskCacheStorage(LoadContextInfo.default, false)
      .asyncDoomURI(createURI(url), "", {
        onCacheEntryDoomed: function(result) {
          callback(result);
        }
      });
}

function write_and_check(str, data, len)
{
  var written = str.write(data, len);
  if (written != len) {
    do_throw("str.write has not written all data!\n" +
             "  Expected: " + len  + "\n" +
             "  Actual: " + written + "\n");
  }
}

function write_entry()
{
  asyncOpenCacheEntry("http://testentry/", "disk", Ci.nsICacheStorage.OPEN_TRUNCATE, null, function(status, entry) {
    write_entry_cont(entry, entry.openOutputStream(0));
  });
}

function write_entry_cont(entry, ostream)
{
  var data = "testdata";
  write_and_check(ostream, data, data.length);
  ostream.close();
  entry.close();
  doom("http://testentry/", check_doom1);
}

function check_doom1(status)
{
  do_check_eq(status, Cr.NS_OK);
  doom("http://nonexistententry/", check_doom2);
}

function check_doom2(status)
{
  do_check_eq(status, Cr.NS_ERROR_NOT_AVAILABLE);
  asyncOpenCacheEntry("http://testentry/", "disk", Ci.nsICacheStorage.OPEN_TRUNCATE, null, function(status, entry) {
    write_entry2(entry, entry.openOutputStream(0));
  });
}

var gEntry;
var gOstream;
function write_entry2(entry, ostream)
{
  // write some data and doom the entry while it is active
  var data = "testdata";
  write_and_check(ostream, data, data.length);
  gEntry = entry;
  gOstream = ostream;
  doom("http://testentry/", check_doom3);
}

function check_doom3(status)
{
  do_check_eq(status, Cr.NS_OK);
  // entry was doomed but writing should still succeed
  var data = "testdata";
  write_and_check(gOstream, data, data.length);
  gOstream.close();
  gEntry.close();
  // dooming the same entry again should fail
  doom("http://testentry/", check_doom4);
}

function check_doom4(status)
{
  do_check_eq(status, Cr.NS_ERROR_NOT_AVAILABLE);
  do_test_finished();
}

function run_test() {
  do_get_profile();

  // clear the cache
  evict_cache_entries();
  write_entry();
  do_test_pending();
}