dom/quota/ArtificialFailure.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/quota/ArtificialFailure.h"
   8
   9 #include "mozilla/Result.h"
  10 #include "mozilla/StaticPrefs_dom.h"
  11
  12 namespace mozilla::dom::quota {
  13
  14 Result<Ok, nsresult> ArtificialFailure(
  15     nsIQuotaArtificialFailure::Category aCategory) {
  16   MOZ_ASSERT(aCategory != 0 && ((aCategory & (aCategory - 1)) == 0));
  17
  18   if ((StaticPrefs::dom_quotaManager_artificialFailure_categories() &
  19        aCategory) == 0) {
  20     return Ok{};
  21   }
  22
  23   uint32_t probability =
  24       StaticPrefs::dom_quotaManager_artificialFailure_probability();
  25   if (probability == 0) {
  26     return Ok{};
  27   }
  28
  29   uint32_t randomValue = std::rand() % 100;
  30   if (randomValue >= probability) {
  31     return Ok{};
  32   }
  33
  34   uint32_t errorCode =
  35       StaticPrefs::dom_quotaManager_artificialFailure_errorCode();
  36
  37   nsresult rv = static_cast<nsresult>(errorCode);
  38   return Err(rv);
  39 }
  40
  41 }  // namespace mozilla::dom::quota