tor-browser

The Tor Browser
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JSOracleParent.cpp (2699B)

      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
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/JSOracleParent.h"
      8 
      9 #include "mozilla/ClearOnShutdown.h"
     10 #include "mozilla/RefPtr.h"
     11 #include "mozilla/dom/PJSOracle.h"
     12 #include "mozilla/ipc/Endpoint.h"
     13 #include "mozilla/ipc/UtilityProcessManager.h"
     14 
     15 using namespace mozilla;
     16 using namespace mozilla::dom;
     17 
     18 static StaticRefPtr<JSOracleParent> sOracleSingleton;
     19 
     20 /* static */
     21 void JSOracleParent::WithJSOracle(
     22    const std::function<void(JSOracleParent* aParent)>& aCallback) {
     23  GetSingleton()->StartJSOracle()->Then(
     24      GetMainThreadSerialEventTarget(), __func__,
     25      [aCallback](const JSOraclePromise::ResolveOrRejectValue& aResult) {
     26        aCallback(aResult.IsReject() || !aResult.ResolveValue()
     27                      ? nullptr
     28                      : GetSingleton());
     29      });
     30 }
     31 
     32 void JSOracleParent::ActorDestroy(ActorDestroyReason aReason) {
     33  // Given an actor can only be bound to one process,
     34  // if the utility process crashes and we create a new one,
     35  // we can't reuse the same JSOracleParent instance for it,
     36  // so we always create a new JSOracleParent to replace
     37  // the existing one.
     38  if (aReason == ActorDestroyReason::AbnormalShutdown) {
     39    sOracleSingleton = new JSOracleParent();
     40  }
     41 }
     42 
     43 /* static */
     44 JSOracleParent* JSOracleParent::GetSingleton() {
     45  if (!sOracleSingleton) {
     46    sOracleSingleton = new JSOracleParent();
     47    ClearOnShutdown(&sOracleSingleton);
     48  }
     49 
     50  return sOracleSingleton;
     51 }
     52 
     53 RefPtr<JSOracleParent::JSOraclePromise> JSOracleParent::StartJSOracle() {
     54  using namespace mozilla::ipc;
     55  RefPtr<JSOracleParent> parent = JSOracleParent::GetSingleton();
     56  return UtilityProcessManager::GetSingleton()->StartJSOracle(parent);
     57 }
     58 
     59 nsresult JSOracleParent::BindToUtilityProcess(
     60    const RefPtr<mozilla::ipc::UtilityProcessParent>& aUtilityParent) {
     61  Endpoint<PJSOracleParent> parentEnd;
     62  Endpoint<PJSOracleChild> childEnd;
     63  MOZ_ASSERT(aUtilityParent);
     64  if (NS_FAILED(PJSOracle::CreateEndpoints(
     65          mozilla::ipc::EndpointProcInfo::Current(),
     66          aUtilityParent->OtherEndpointProcInfo(), &parentEnd, &childEnd))) {
     67    return NS_ERROR_FAILURE;
     68  }
     69 
     70  if (!aUtilityParent->SendStartJSOracleService(std::move(childEnd))) {
     71    return NS_ERROR_FAILURE;
     72  }
     73 
     74  Bind(std::move(parentEnd));
     75 
     76  return NS_OK;
     77 }
     78 
     79 void JSOracleParent::Bind(Endpoint<PJSOracleParent>&& aEndpoint) {
     80  DebugOnly<bool> ok = aEndpoint.Bind(this);
     81  MOZ_ASSERT(ok);
     82 }