gecko-dev/dom/serviceworkers/ServiceWorkerRegistrationProxy.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ServiceWorkerRegistrationProxy.h"

#include "mozilla/ipc/BackgroundParent.h"
#include "ServiceWorkerManager.h"
#include "ServiceWorkerRegistrationParent.h"
#include "ServiceWorkerUnregisterCallback.h"

namespace mozilla {
namespace dom {

using mozilla::ipc::AssertIsOnBackgroundThread;

ServiceWorkerRegistrationProxy::~ServiceWorkerRegistrationProxy() {
  // Any thread
  MOZ_DIAGNOSTIC_ASSERT(!mActor);
  MOZ_DIAGNOSTIC_ASSERT(!mReg);
}

void ServiceWorkerRegistrationProxy::MaybeShutdownOnBGThread() {
  AssertIsOnBackgroundThread();
  if (!mActor) {
    return;
  }
  mActor->MaybeSendDelete();
}

void ServiceWorkerRegistrationProxy::UpdateStateOnBGThread(
    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
  AssertIsOnBackgroundThread();
  if (!mActor) {
    return;
  }
  Unused << mActor->SendUpdateState(aDescriptor.ToIPC());
}

void ServiceWorkerRegistrationProxy::FireUpdateFoundOnBGThread() {
  AssertIsOnBackgroundThread();
  if (!mActor) {
    return;
  }
  Unused << mActor->SendFireUpdateFound();
}

void ServiceWorkerRegistrationProxy::InitOnMainThread() {
  AssertIsOnMainThread();

  auto scopeExit = MakeScopeExit([&] { MaybeShutdownOnMainThread(); });

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  NS_ENSURE_TRUE_VOID(swm);

  RefPtr<ServiceWorkerRegistrationInfo> reg =
      swm->GetRegistration(mDescriptor.PrincipalInfo(), mDescriptor.Scope());
  NS_ENSURE_TRUE_VOID(reg);

  scopeExit.release();

  mReg = new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
      "ServiceWorkerRegistrationProxy::mInfo", reg);

  mReg->AddInstance(this, mDescriptor);
}

void ServiceWorkerRegistrationProxy::MaybeShutdownOnMainThread() {
  AssertIsOnMainThread();

  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
      __func__, this, &ServiceWorkerRegistrationProxy::MaybeShutdownOnBGThread);

  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
}

void ServiceWorkerRegistrationProxy::StopListeningOnMainThread() {
  AssertIsOnMainThread();

  if (!mReg) {
    return;
  }

  mReg->RemoveInstance(this);
  mReg = nullptr;
}

void ServiceWorkerRegistrationProxy::UpdateState(
    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
  AssertIsOnMainThread();

  if (mDescriptor == aDescriptor) {
    return;
  }
  mDescriptor = aDescriptor;

  nsCOMPtr<nsIRunnable> r =
      NewRunnableMethod<ServiceWorkerRegistrationDescriptor>(
          __func__, this,
          &ServiceWorkerRegistrationProxy::UpdateStateOnBGThread, aDescriptor);

  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
}

void ServiceWorkerRegistrationProxy::FireUpdateFound() {
  AssertIsOnMainThread();

  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
      __func__, this,
      &ServiceWorkerRegistrationProxy::FireUpdateFoundOnBGThread);

  MOZ_ALWAYS_SUCCEEDS(mEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL));
}

void ServiceWorkerRegistrationProxy::RegistrationRemoved() {
  MaybeShutdownOnMainThread();
}

void ServiceWorkerRegistrationProxy::GetScope(nsAString& aScope) const {
  CopyUTF8toUTF16(mDescriptor.Scope(), aScope);
}

bool ServiceWorkerRegistrationProxy::MatchesDescriptor(
    const ServiceWorkerRegistrationDescriptor& aDescriptor) {
  AssertIsOnMainThread();
  return aDescriptor.Id() == mDescriptor.Id() &&
         aDescriptor.PrincipalInfo() == mDescriptor.PrincipalInfo() &&
         aDescriptor.Scope() == mDescriptor.Scope();
}

ServiceWorkerRegistrationProxy::ServiceWorkerRegistrationProxy(
    const ServiceWorkerRegistrationDescriptor& aDescriptor)
    : mActor(nullptr),
      mEventTarget(GetCurrentThreadSerialEventTarget()),
      mDescriptor(aDescriptor) {}

void ServiceWorkerRegistrationProxy::Init(
    ServiceWorkerRegistrationParent* aActor) {
  AssertIsOnBackgroundThread();
  MOZ_DIAGNOSTIC_ASSERT(aActor);
  MOZ_DIAGNOSTIC_ASSERT(!mActor);
  MOZ_DIAGNOSTIC_ASSERT(mEventTarget);

  mActor = aActor;

  // Note, this must be done from a separate Init() method and not in
  // the constructor.  If done from the constructor the runnable can
  // execute, complete, and release its reference before the constructor
  // returns.
  nsCOMPtr<nsIRunnable> r =
      NewRunnableMethod("ServiceWorkerRegistrationProxy::Init", this,
                        &ServiceWorkerRegistrationProxy::InitOnMainThread);
  MOZ_ALWAYS_SUCCEEDS(SystemGroup::Dispatch(TaskCategory::Other, r.forget()));
}

void ServiceWorkerRegistrationProxy::RevokeActor(
    ServiceWorkerRegistrationParent* aActor) {
  AssertIsOnBackgroundThread();
  MOZ_DIAGNOSTIC_ASSERT(mActor);
  MOZ_DIAGNOSTIC_ASSERT(mActor == aActor);
  mActor = nullptr;

  nsCOMPtr<nsIRunnable> r = NewRunnableMethod(
      __func__, this,
      &ServiceWorkerRegistrationProxy::StopListeningOnMainThread);
  MOZ_ALWAYS_SUCCEEDS(SystemGroup::Dispatch(TaskCategory::Other, r.forget()));
}

RefPtr<GenericPromise> ServiceWorkerRegistrationProxy::Unregister() {
  AssertIsOnBackgroundThread();

  RefPtr<ServiceWorkerRegistrationProxy> self = this;
  RefPtr<GenericPromise::Private> promise =
      new GenericPromise::Private(__func__);

  nsCOMPtr<nsIRunnable> r =
      NS_NewRunnableFunction(__func__, [self, promise]() mutable {
        nsresult rv = NS_ERROR_DOM_INVALID_STATE_ERR;
        auto scopeExit = MakeScopeExit([&] { promise->Reject(rv, __func__); });

        NS_ENSURE_TRUE_VOID(self->mReg);

        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
        NS_ENSURE_TRUE_VOID(swm);

        RefPtr<UnregisterCallback> cb = new UnregisterCallback(promise);

        rv = swm->Unregister(self->mReg->Principal(), cb,
                             NS_ConvertUTF8toUTF16(self->mReg->Scope()));
        NS_ENSURE_SUCCESS_VOID(rv);

        scopeExit.release();
      });

  MOZ_ALWAYS_SUCCEEDS(SystemGroup::Dispatch(TaskCategory::Other, r.forget()));

  return promise;
}

namespace {

class UpdateCallback final : public ServiceWorkerUpdateFinishCallback {
  RefPtr<ServiceWorkerRegistrationPromise::Private> mPromise;

  ~UpdateCallback() = default;

 public:
  explicit UpdateCallback(
      RefPtr<ServiceWorkerRegistrationPromise::Private>&& aPromise)
      : mPromise(std::move(aPromise)) {
    MOZ_DIAGNOSTIC_ASSERT(mPromise);
  }

  void UpdateSucceeded(ServiceWorkerRegistrationInfo* aInfo) override {
    mPromise->Resolve(aInfo->Descriptor(), __func__);
  }

  void UpdateFailed(ErrorResult& aResult) override {
    mPromise->Reject(CopyableErrorResult(aResult), __func__);
  }
};

}  // anonymous namespace

RefPtr<ServiceWorkerRegistrationPromise>
ServiceWorkerRegistrationProxy::Update() {
  AssertIsOnBackgroundThread();

  RefPtr<ServiceWorkerRegistrationProxy> self = this;
  RefPtr<ServiceWorkerRegistrationPromise::Private> promise =
      new ServiceWorkerRegistrationPromise::Private(__func__);

  nsCOMPtr<nsIRunnable> r =
      NS_NewRunnableFunction(__func__, [self, promise]() mutable {
        auto scopeExit = MakeScopeExit(
            [&] { promise->Reject(NS_ERROR_DOM_INVALID_STATE_ERR, __func__); });

        NS_ENSURE_TRUE_VOID(self->mReg);

        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
        NS_ENSURE_TRUE_VOID(swm);

        RefPtr<UpdateCallback> cb = new UpdateCallback(std::move(promise));
        swm->Update(self->mReg->Principal(), self->mReg->Scope(), cb);

        scopeExit.release();
      });

  MOZ_ALWAYS_SUCCEEDS(SystemGroup::Dispatch(TaskCategory::Other, r.forget()));

  return promise;
}

}  // namespace dom
}  // namespace mozilla