gecko-dev/dom/serviceworkers/ServiceWorkerPrivate.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 "ServiceWorkerPrivate.h"

#include "ServiceWorkerCloneData.h"
#include "ServiceWorkerManager.h"
#include "nsContentUtils.h"
#include "nsICacheInfoChannel.h"
#include "nsIHttpChannelInternal.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsINamed.h"
#include "nsINetworkInterceptController.h"
#include "nsIPushErrorReporter.h"
#include "nsISupportsImpl.h"
#include "nsITimedChannel.h"
#include "nsIUploadChannel2.h"
#include "nsNetUtil.h"
#include "nsProxyRelease.h"
#include "nsQueryObject.h"
#include "nsStreamUtils.h"
#include "nsStringStream.h"
#include "mozilla/Assertions.h"
#include "mozilla/CycleCollectedJSContext.h" // for MicroTaskRunnable
#include "mozilla/JSObjectHolder.h"
#include "mozilla/dom/Client.h"
#include "mozilla/dom/ClientIPCTypes.h"
#include "mozilla/dom/DOMPrefs.h"
#include "mozilla/dom/FetchUtil.h"
#include "mozilla/dom/IndexedDatabaseManager.h"
#include "mozilla/dom/InternalHeaders.h"
#include "mozilla/dom/NotificationEvent.h"
#include "mozilla/dom/PromiseNativeHandler.h"
#include "mozilla/dom/PushEventBinding.h"
#include "mozilla/dom/RequestBinding.h"
#include "mozilla/dom/WorkerDebugger.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/dom/ipc/StructuredCloneData.h"
#include "mozilla/Unused.h"

using namespace mozilla;
using namespace mozilla::dom;

namespace mozilla {
namespace dom {

using mozilla::ipc::PrincipalInfo;

NS_IMPL_CYCLE_COLLECTING_NATIVE_ADDREF(ServiceWorkerPrivate)
NS_IMPL_CYCLE_COLLECTING_NATIVE_RELEASE(ServiceWorkerPrivate)
NS_IMPL_CYCLE_COLLECTION(ServiceWorkerPrivate, mSupportsArray)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(ServiceWorkerPrivate, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(ServiceWorkerPrivate, Release)

// Tracks the "dom.serviceWorkers.disable_open_click_delay" preference.  Modified
// on main thread, read on worker threads.
// It is updated every time a "notificationclick" event is dispatched. While
// this is done without synchronization, at the worst, the thread will just get
// an older value within which a popup is allowed to be displayed, which will
// still be a valid value since it was set prior to dispatching the runnable.
Atomic<uint32_t> gDOMDisableOpenClickDelay(0);

// Used to keep track of pending waitUntil as well as in-flight extendable events.
// When the last token is released, we attempt to terminate the worker.
class KeepAliveToken final : public nsISupports
{
public:
  NS_DECL_ISUPPORTS

  explicit KeepAliveToken(ServiceWorkerPrivate* aPrivate)
    : mPrivate(aPrivate)
  {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aPrivate);
    mPrivate->AddToken();
  }

private:
  ~KeepAliveToken()
  {
    MOZ_ASSERT(NS_IsMainThread());
    mPrivate->ReleaseToken();
  }

  RefPtr<ServiceWorkerPrivate> mPrivate;
};

NS_IMPL_ISUPPORTS0(KeepAliveToken)

ServiceWorkerPrivate::ServiceWorkerPrivate(ServiceWorkerInfo* aInfo)
  : mInfo(aInfo)
  , mDebuggerCount(0)
  , mTokenCount(0)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aInfo);

  mIdleWorkerTimer = NS_NewTimer();
  MOZ_ASSERT(mIdleWorkerTimer);
}

ServiceWorkerPrivate::~ServiceWorkerPrivate()
{
  MOZ_ASSERT(!mWorkerPrivate);
  MOZ_ASSERT(!mTokenCount);
  MOZ_ASSERT(!mInfo);
  MOZ_ASSERT(mSupportsArray.IsEmpty());

  mIdleWorkerTimer->Cancel();
}

namespace {

class CheckScriptEvaluationWithCallback final : public WorkerRunnable
{
  nsMainThreadPtrHandle<ServiceWorkerPrivate> mServiceWorkerPrivate;
  nsMainThreadPtrHandle<KeepAliveToken> mKeepAliveToken;

  // The script evaluation result must be reported even if the runnable
  // is cancelled.
  RefPtr<LifeCycleEventCallback> mScriptEvaluationCallback;

#ifdef DEBUG
  bool mDone;
#endif

public:
  CheckScriptEvaluationWithCallback(WorkerPrivate* aWorkerPrivate,
                                    ServiceWorkerPrivate* aServiceWorkerPrivate,
                                    KeepAliveToken* aKeepAliveToken,
                                    LifeCycleEventCallback* aScriptEvaluationCallback)
    : WorkerRunnable(aWorkerPrivate)
    , mServiceWorkerPrivate(new nsMainThreadPtrHolder<ServiceWorkerPrivate>(
        "CheckScriptEvaluationWithCallback::mServiceWorkerPrivate", aServiceWorkerPrivate))
    , mKeepAliveToken(new nsMainThreadPtrHolder<KeepAliveToken>(
        "CheckScriptEvaluationWithCallback::mKeepAliveToken", aKeepAliveToken))
    , mScriptEvaluationCallback(aScriptEvaluationCallback)
#ifdef DEBUG
    , mDone(false)
#endif
  {
    MOZ_ASSERT(NS_IsMainThread());
  }

  ~CheckScriptEvaluationWithCallback()
  {
    MOZ_ASSERT(mDone);
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->AssertIsOnWorkerThread();

    bool fetchHandlerWasAdded = aWorkerPrivate->FetchHandlerWasAdded();
    nsCOMPtr<nsIRunnable> runnable = NewRunnableMethod<bool>(
      "dom::CheckScriptEvaluationWithCallback::ReportFetchFlag",
      this,
      &CheckScriptEvaluationWithCallback::ReportFetchFlag,
      fetchHandlerWasAdded);
    aWorkerPrivate->DispatchToMainThread(runnable.forget());

    ReportScriptEvaluationResult(aWorkerPrivate->WorkerScriptExecutedSuccessfully());

    return true;
  }

  void
  ReportFetchFlag(bool aFetchHandlerWasAdded)
  {
    MOZ_ASSERT(NS_IsMainThread());
    mServiceWorkerPrivate->SetHandlesFetch(aFetchHandlerWasAdded);
  }

  nsresult
  Cancel() override
  {
    ReportScriptEvaluationResult(false);
    return WorkerRunnable::Cancel();
  }

private:
  void
  ReportScriptEvaluationResult(bool aScriptEvaluationResult)
  {
#ifdef DEBUG
    mDone = true;
#endif
    mScriptEvaluationCallback->SetResult(aScriptEvaluationResult);
    MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(mScriptEvaluationCallback));
  }
};

} // anonymous namespace

nsresult
ServiceWorkerPrivate::CheckScriptEvaluation(LifeCycleEventCallback* aScriptEvaluationCallback)
{
  nsresult rv = SpawnWorkerIfNeeded(LifeCycleEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();
  RefPtr<WorkerRunnable> r = new CheckScriptEvaluationWithCallback(mWorkerPrivate,
                                                                   this, token,
                                                                   aScriptEvaluationCallback);
  if (NS_WARN_IF(!r->Dispatch())) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

namespace {

enum ExtendableEventResult {
    Rejected = 0,
    Resolved
};

class ExtendableEventCallback {
public:
  virtual void
  FinishedWithResult(ExtendableEventResult aResult) = 0;

  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
};

class KeepAliveHandler final : public WorkerHolder
                             , public ExtendableEvent::ExtensionsHandler
                             , public PromiseNativeHandler
{
  // This class manages lifetime extensions added by calling WaitUntil()
  // or RespondWith(). We allow new extensions as long as we still hold
  // |mKeepAliveToken|. Once the last promise was settled, we queue a microtask
  // which releases the token and prevents further extensions. By doing this,
  // we give other pending microtasks a chance to continue adding extensions.

  nsMainThreadPtrHandle<KeepAliveToken> mKeepAliveToken;
  WorkerPrivate* MOZ_NON_OWNING_REF mWorkerPrivate;
  bool mWorkerHolderAdded;

  // We start holding a self reference when the first extension promise is
  // added. As far as I can tell, the only case where this is useful is when
  // we're waiting indefinitely on a promise that's no longer reachable
  // and will never be settled.
  // The cycle is broken when the last promise was settled or when the
  // worker is shutting down.
  RefPtr<KeepAliveHandler> mSelfRef;

  // Called when the last promise was settled.
  RefPtr<ExtendableEventCallback> mCallback;

  uint32_t mPendingPromisesCount;

  // We don't actually care what values the promises resolve to, only whether
  // any of them were rejected.
  bool mRejected;

public:
  NS_DECL_ISUPPORTS

  explicit KeepAliveHandler(const nsMainThreadPtrHandle<KeepAliveToken>& aKeepAliveToken,
                            ExtendableEventCallback* aCallback)
    : WorkerHolder("KeepAliveHolder")
    , mKeepAliveToken(aKeepAliveToken)
    , mWorkerPrivate(GetCurrentThreadWorkerPrivate())
    , mWorkerHolderAdded(false)
    , mCallback(aCallback)
    , mPendingPromisesCount(0)
    , mRejected(false)
  {
    MOZ_ASSERT(mKeepAliveToken);
    MOZ_ASSERT(mWorkerPrivate);
  }

  bool
  UseWorkerHolder()
  {
    MOZ_ASSERT(mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();
    MOZ_ASSERT(!mWorkerHolderAdded);
    mWorkerHolderAdded = HoldWorker(mWorkerPrivate, Canceling);
    return mWorkerHolderAdded;
  }

  bool
  WaitOnPromise(Promise& aPromise) override
  {
    if (!mKeepAliveToken) {
      MOZ_ASSERT(!mSelfRef, "We shouldn't be holding a self reference!");
      return false;
    }
    if (!mSelfRef) {
      MOZ_ASSERT(!mPendingPromisesCount);
      mSelfRef = this;
    }

    ++mPendingPromisesCount;
    aPromise.AppendNativeHandler(this);

    return true;
  }

  void
  ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override
  {
    RemovePromise(Resolved);
  }

  void
  RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override
  {
    RemovePromise(Rejected);
  }

  bool
  Notify(WorkerStatus aStatus) override
  {
    MOZ_ASSERT(mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();
    if (aStatus < Canceling) {
      return true;
    }

    MaybeCleanup();
    return true;
  }

  void
  MaybeDone()
  {
    MOZ_ASSERT(mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();

    if (mPendingPromisesCount || !mKeepAliveToken) {
      return;
    }
    if (mCallback) {
      mCallback->FinishedWithResult(mRejected ? Rejected : Resolved);
    }

    MaybeCleanup();
  }

private:
  ~KeepAliveHandler()
  {
    MaybeCleanup();
  }

  void
  MaybeCleanup()
  {
    MOZ_ASSERT(mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();
    if (!mKeepAliveToken) {
      return;
    }
    if (mWorkerHolderAdded) {
      ReleaseWorker();
    }

    mKeepAliveToken = nullptr;
    mSelfRef = nullptr;
  }

  class MaybeDoneRunner : public MicroTaskRunnable
  {
  public:
    explicit MaybeDoneRunner(KeepAliveHandler* aHandler) : mHandler(aHandler) {}
    virtual void Run(AutoSlowOperation& aAso) override
    {
      mHandler->MaybeDone();
    }

    RefPtr<KeepAliveHandler> mHandler;
  };

  void
  RemovePromise(ExtendableEventResult aResult)
  {
    MOZ_ASSERT(mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();
    MOZ_DIAGNOSTIC_ASSERT(mPendingPromisesCount > 0);

    // Note: mSelfRef and mKeepAliveToken can be nullptr here
    //       if MaybeCleanup() was called just before a promise
    //       settled.  This can happen, for example, if the
    //       worker thread is being terminated for running too
    //       long, browser shutdown, etc.

    mRejected |= (aResult == Rejected);

    --mPendingPromisesCount;
    if (mPendingPromisesCount) {
      return;
    }

    CycleCollectedJSContext* cx = CycleCollectedJSContext::Get();
    MOZ_ASSERT(cx);

    RefPtr<MaybeDoneRunner> r = new MaybeDoneRunner(this);
    cx->DispatchToMicroTask(r.forget());
  }
};

NS_IMPL_ISUPPORTS0(KeepAliveHandler)

class RegistrationUpdateRunnable : public Runnable
{
  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
  const bool mNeedTimeCheck;

public:
  RegistrationUpdateRunnable(
    nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
    bool aNeedTimeCheck)
    : Runnable("dom::RegistrationUpdateRunnable")
    , mRegistration(aRegistration)
    , mNeedTimeCheck(aNeedTimeCheck)
  {
    MOZ_DIAGNOSTIC_ASSERT(mRegistration);
  }

  NS_IMETHOD
  Run() override
  {
    if (mNeedTimeCheck) {
      mRegistration->MaybeScheduleTimeCheckAndUpdate();
    } else {
      mRegistration->MaybeScheduleUpdate();
    }
    return NS_OK;
  }
};

class ExtendableEventWorkerRunnable : public WorkerRunnable
{
protected:
  nsMainThreadPtrHandle<KeepAliveToken> mKeepAliveToken;

public:
  ExtendableEventWorkerRunnable(WorkerPrivate* aWorkerPrivate,
                                KeepAliveToken* aKeepAliveToken)
    : WorkerRunnable(aWorkerPrivate)
  {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aKeepAliveToken);

    mKeepAliveToken =
      new nsMainThreadPtrHolder<KeepAliveToken>(
        "ExtendableEventWorkerRunnable::mKeepAliveToken", aKeepAliveToken);
  }

  nsresult
  DispatchExtendableEventOnWorkerScope(JSContext* aCx,
                                       WorkerGlobalScope* aWorkerScope,
                                       ExtendableEvent* aEvent,
                                       ExtendableEventCallback* aCallback)
  {
    MOZ_ASSERT(aWorkerScope);
    MOZ_ASSERT(aEvent);
    nsCOMPtr<nsIGlobalObject> sgo = aWorkerScope;
    WidgetEvent* internalEvent = aEvent->WidgetEventPtr();

    RefPtr<KeepAliveHandler> keepAliveHandler =
      new KeepAliveHandler(mKeepAliveToken, aCallback);
    if (NS_WARN_IF(!keepAliveHandler->UseWorkerHolder())) {
      return NS_ERROR_FAILURE;
    }

    // This must always be set *before* dispatching the event, otherwise
    // waitUntil calls will fail.
    aEvent->SetKeepAliveHandler(keepAliveHandler);

    ErrorResult result;
    aWorkerScope->DispatchEvent(*aEvent, result);
    if (NS_WARN_IF(result.Failed())) {
      result.SuppressException();
      return NS_ERROR_FAILURE;
    }

    // [[ If e’s extend lifetime promises is empty, unset e’s extensions allowed
    //    flag and abort these steps. ]]
    keepAliveHandler->MaybeDone();

    // We don't block the event when getting an exception but still report the
    // error message.
    // Report exception message. Note: This will not stop the event.
    if (internalEvent->mFlags.mExceptionWasRaised) {
      result.SuppressException();
      return NS_ERROR_XPC_JS_THREW_EXCEPTION;
    }

    return NS_OK;
  }
};

class SendMessageEventRunnable final : public ExtendableEventWorkerRunnable
{
  const ClientInfoAndState mClientInfoAndState;
  RefPtr<ServiceWorkerCloneData> mData;

public:
  SendMessageEventRunnable(WorkerPrivate*  aWorkerPrivate,
                           KeepAliveToken* aKeepAliveToken,
                           const ClientInfoAndState& aClientInfoAndState,
                           RefPtr<ServiceWorkerCloneData>&& aData)
    : ExtendableEventWorkerRunnable(aWorkerPrivate, aKeepAliveToken)
    , mClientInfoAndState(aClientInfoAndState)
    , mData(std::move(aData))
  {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_DIAGNOSTIC_ASSERT(mData);
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    JS::Rooted<JS::Value> messageData(aCx);
    nsCOMPtr<nsIGlobalObject> sgo = aWorkerPrivate->GlobalScope();
    ErrorResult rv;
    mData->Read(aCx, &messageData, rv);
    if (NS_WARN_IF(rv.Failed())) {
      return true;
    }

    Sequence<OwningNonNull<MessagePort>> ports;
    if (!mData->TakeTransferredPortsAsSequence(ports)) {
      return true;
    }

    RootedDictionary<ExtendableMessageEventInit> init(aCx);

    init.mBubbles = false;
    init.mCancelable = false;

    init.mData = messageData;
    init.mPorts = ports;
    init.mSource.SetValue().SetAsClient() =
      new Client(sgo, mClientInfoAndState);

    RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();
    RefPtr<ExtendableMessageEvent> extendableEvent =
      ExtendableMessageEvent::Constructor(target, NS_LITERAL_STRING("message"),
                                          init, rv);
    if (NS_WARN_IF(rv.Failed())) {
      rv.SuppressException();
      return false;
    }

    extendableEvent->SetTrusted(true);

    return NS_SUCCEEDED(DispatchExtendableEventOnWorkerScope(aCx,
                                                             aWorkerPrivate->GlobalScope(),
                                                             extendableEvent,
                                                             nullptr));
  }
};

} // anonymous namespace

nsresult
ServiceWorkerPrivate::SendMessageEvent(RefPtr<ServiceWorkerCloneData>&& aData,
                                       const ClientInfoAndState& aClientInfoAndState)
{
  MOZ_ASSERT(NS_IsMainThread());

  nsresult rv = SpawnWorkerIfNeeded(MessageEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();
  RefPtr<SendMessageEventRunnable> runnable =
    new SendMessageEventRunnable(mWorkerPrivate, token, aClientInfoAndState,
                                 std::move(aData));

  if (!runnable->Dispatch()) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

namespace {

// Handle functional event
// 9.9.7 If the time difference in seconds calculated by the current time minus
// registration's last update check time is greater than 86400, invoke Soft Update
// algorithm.
class ExtendableFunctionalEventWorkerRunnable : public ExtendableEventWorkerRunnable
{
protected:
  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
public:
  ExtendableFunctionalEventWorkerRunnable(WorkerPrivate* aWorkerPrivate,
                                          KeepAliveToken* aKeepAliveToken,
                                          nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration)
    : ExtendableEventWorkerRunnable(aWorkerPrivate, aKeepAliveToken)
    , mRegistration(aRegistration)
  {
    MOZ_DIAGNOSTIC_ASSERT(aRegistration);
  }

  void
  PostRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate, bool aRunResult) override
  {
    // Sub-class PreRun() or WorkerRun() methods could clear our mRegistration.
    if (mRegistration) {
      nsCOMPtr<nsIRunnable> runnable =
        new RegistrationUpdateRunnable(mRegistration, true /* time check */);
      aWorkerPrivate->DispatchToMainThread(runnable.forget());
    }

    ExtendableEventWorkerRunnable::PostRun(aCx, aWorkerPrivate, aRunResult);
  }
};

/*
 * Fires 'install' event on the ServiceWorkerGlobalScope. Modifies busy count
 * since it fires the event. This is ok since there can't be nested
 * ServiceWorkers, so the parent thread -> worker thread requirement for
 * runnables is satisfied.
 */
class LifecycleEventWorkerRunnable : public ExtendableEventWorkerRunnable
{
  nsString mEventName;
  RefPtr<LifeCycleEventCallback> mCallback;

public:
  LifecycleEventWorkerRunnable(WorkerPrivate* aWorkerPrivate,
                               KeepAliveToken* aToken,
                               const nsAString& aEventName,
                               LifeCycleEventCallback* aCallback)
      : ExtendableEventWorkerRunnable(aWorkerPrivate, aToken)
      , mEventName(aEventName)
      , mCallback(aCallback)
  {
    MOZ_ASSERT(NS_IsMainThread());
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_ASSERT(aWorkerPrivate);
    return DispatchLifecycleEvent(aCx, aWorkerPrivate);
  }

  nsresult
  Cancel() override
  {
    mCallback->SetResult(false);
    MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(mCallback));

    return WorkerRunnable::Cancel();
  }

private:
  bool
  DispatchLifecycleEvent(JSContext* aCx, WorkerPrivate* aWorkerPrivate);

};

/*
 * Used to handle ExtendableEvent::waitUntil() and catch abnormal worker
 * termination during the execution of life cycle events. It is responsible
 * with advancing the job queue for install/activate tasks.
 */
class LifeCycleEventWatcher final : public ExtendableEventCallback,
                                    public WorkerHolder
{
  WorkerPrivate* mWorkerPrivate;
  RefPtr<LifeCycleEventCallback> mCallback;
  bool mDone;

  ~LifeCycleEventWatcher()
  {
    if (mDone) {
      return;
    }

    MOZ_ASSERT(GetCurrentThreadWorkerPrivate() == mWorkerPrivate);
    // XXXcatalinb: If all the promises passed to waitUntil go out of scope,
    // the resulting Promise.all will be cycle collected and it will drop its
    // native handlers (including this object). Instead of waiting for a timeout
    // we report the failure now.
    ReportResult(false);
  }

public:
  NS_INLINE_DECL_REFCOUNTING(LifeCycleEventWatcher, override)

  LifeCycleEventWatcher(WorkerPrivate* aWorkerPrivate,
                        LifeCycleEventCallback* aCallback)
    : WorkerHolder("LifeCycleEventWatcher")
    , mWorkerPrivate(aWorkerPrivate)
    , mCallback(aCallback)
    , mDone(false)
  {
    MOZ_ASSERT(aWorkerPrivate);
    aWorkerPrivate->AssertIsOnWorkerThread();
  }

  bool
  Init()
  {
    MOZ_ASSERT(mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();

    // We need to listen for worker termination in case the event handler
    // never completes or never resolves the waitUntil promise. There are
    // two possible scenarios:
    // 1. The keepAlive token expires and the worker is terminated, in which
    //    case the registration/update promise will be rejected
    // 2. A new service worker is registered which will terminate the current
    //    installing worker.
    if (NS_WARN_IF(!HoldWorker(mWorkerPrivate, Canceling))) {
      NS_WARNING("LifeCycleEventWatcher failed to add feature.");
      ReportResult(false);
      return false;
    }

    return true;
  }

  bool
  Notify(WorkerStatus aStatus) override
  {
    if (aStatus < Canceling) {
      return true;
    }

    MOZ_ASSERT(GetCurrentThreadWorkerPrivate() == mWorkerPrivate);
    ReportResult(false);

    return true;
  }

  void
  ReportResult(bool aResult)
  {
    mWorkerPrivate->AssertIsOnWorkerThread();

    if (mDone) {
      return;
    }
    mDone = true;

    mCallback->SetResult(aResult);
    nsresult rv = mWorkerPrivate->DispatchToMainThread(mCallback);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      MOZ_CRASH("Failed to dispatch life cycle event handler.");
    }

    ReleaseWorker();
  }

  void
  FinishedWithResult(ExtendableEventResult aResult) override
  {
    MOZ_ASSERT(GetCurrentThreadWorkerPrivate() == mWorkerPrivate);
    mWorkerPrivate->AssertIsOnWorkerThread();
    ReportResult(aResult == Resolved);

    // Note, all WaitUntil() rejections are reported to client consoles
    // by the WaitUntilHandler in ServiceWorkerEvents.  This ensures that
    // errors in non-lifecycle events like FetchEvent and PushEvent are
    // reported properly.
  }
};

bool
LifecycleEventWorkerRunnable::DispatchLifecycleEvent(JSContext* aCx,
                                                     WorkerPrivate* aWorkerPrivate)
{
  aWorkerPrivate->AssertIsOnWorkerThread();
  MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());

  RefPtr<ExtendableEvent> event;
  RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();

  if (mEventName.EqualsASCII("install") || mEventName.EqualsASCII("activate")) {
    ExtendableEventInit init;
    init.mBubbles = false;
    init.mCancelable = false;
    event = ExtendableEvent::Constructor(target, mEventName, init);
  } else {
    MOZ_CRASH("Unexpected lifecycle event");
  }

  event->SetTrusted(true);

  // It is important to initialize the watcher before actually dispatching
  // the event in order to catch worker termination while the event handler
  // is still executing. This can happen with infinite loops, for example.
  RefPtr<LifeCycleEventWatcher> watcher =
    new LifeCycleEventWatcher(aWorkerPrivate, mCallback);

  if (!watcher->Init()) {
    return true;
  }

  nsresult rv = DispatchExtendableEventOnWorkerScope(aCx,
                                                     aWorkerPrivate->GlobalScope(),
                                                     event,
                                                     watcher);
  // Do not fail event processing when an exception is thrown.
  if (NS_FAILED(rv) && rv != NS_ERROR_XPC_JS_THREW_EXCEPTION) {
    watcher->ReportResult(false);
  }

  return true;
}

} // anonymous namespace

nsresult
ServiceWorkerPrivate::SendLifeCycleEvent(const nsAString& aEventType,
                                         LifeCycleEventCallback* aCallback)
{
  nsresult rv = SpawnWorkerIfNeeded(LifeCycleEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();
  RefPtr<WorkerRunnable> r = new LifecycleEventWorkerRunnable(mWorkerPrivate,
                                                              token,
                                                              aEventType,
                                                              aCallback);
  if (NS_WARN_IF(!r->Dispatch())) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

namespace {

class PushErrorReporter final : public ExtendableEventCallback
{
  WorkerPrivate* mWorkerPrivate;
  nsString mMessageId;

  ~PushErrorReporter()
  {
  }

public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PushErrorReporter, override)

  PushErrorReporter(WorkerPrivate* aWorkerPrivate,
                    const nsAString& aMessageId)
    : mWorkerPrivate(aWorkerPrivate)
    , mMessageId(aMessageId)
  {
    mWorkerPrivate->AssertIsOnWorkerThread();
  }

  void
  FinishedWithResult(ExtendableEventResult aResult) override
  {
    if (aResult == Rejected) {
      Report(nsIPushErrorReporter::DELIVERY_UNHANDLED_REJECTION);
    }
  }

  void Report(uint16_t aReason = nsIPushErrorReporter::DELIVERY_INTERNAL_ERROR)
  {
    WorkerPrivate* workerPrivate = mWorkerPrivate;
    mWorkerPrivate->AssertIsOnWorkerThread();

    if (NS_WARN_IF(aReason > nsIPushErrorReporter::DELIVERY_INTERNAL_ERROR) ||
        mMessageId.IsEmpty()) {
      return;
    }
    nsCOMPtr<nsIRunnable> runnable = NewRunnableMethod<uint16_t>(
      "dom::PushErrorReporter::ReportOnMainThread",
      this,
      &PushErrorReporter::ReportOnMainThread,
      aReason);
    MOZ_ALWAYS_TRUE(NS_SUCCEEDED(
      workerPrivate->DispatchToMainThread(runnable.forget())));
  }

  void ReportOnMainThread(uint16_t aReason)
  {
    MOZ_ASSERT(NS_IsMainThread());
    nsCOMPtr<nsIPushErrorReporter> reporter =
      do_GetService("@mozilla.org/push/Service;1");
    if (reporter) {
      nsresult rv = reporter->ReportDeliveryError(mMessageId, aReason);
      Unused << NS_WARN_IF(NS_FAILED(rv));
    }
  }
};

class SendPushEventRunnable final : public ExtendableFunctionalEventWorkerRunnable
{
  nsString mMessageId;
  Maybe<nsTArray<uint8_t>> mData;

public:
  SendPushEventRunnable(WorkerPrivate* aWorkerPrivate,
                        KeepAliveToken* aKeepAliveToken,
                        const nsAString& aMessageId,
                        const Maybe<nsTArray<uint8_t>>& aData,
                        nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> aRegistration)
      : ExtendableFunctionalEventWorkerRunnable(
          aWorkerPrivate, aKeepAliveToken, aRegistration)
      , mMessageId(aMessageId)
      , mData(aData)
  {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_ASSERT(aWorkerPrivate);
    GlobalObject globalObj(aCx, aWorkerPrivate->GlobalScope()->GetWrapper());

    RefPtr<PushErrorReporter> errorReporter =
      new PushErrorReporter(aWorkerPrivate, mMessageId);

    PushEventInit pei;
    if (mData) {
      const nsTArray<uint8_t>& bytes = mData.ref();
      JSObject* data = Uint8Array::Create(aCx, bytes.Length(), bytes.Elements());
      if (!data) {
        errorReporter->Report();
        return false;
      }
      pei.mData.Construct().SetAsArrayBufferView().Init(data);
    }
    pei.mBubbles = false;
    pei.mCancelable = false;

    ErrorResult result;
    RefPtr<PushEvent> event =
      PushEvent::Constructor(globalObj, NS_LITERAL_STRING("push"), pei, result);
    if (NS_WARN_IF(result.Failed())) {
      result.SuppressException();
      errorReporter->Report();
      return false;
    }
    event->SetTrusted(true);

    nsresult rv = DispatchExtendableEventOnWorkerScope(aCx,
                                                       aWorkerPrivate->GlobalScope(),
                                                       event,
                                                       errorReporter);
    if (NS_FAILED(rv)) {
      // We don't cancel WorkerPrivate when catching an excetpion.
      errorReporter->Report(nsIPushErrorReporter::DELIVERY_UNCAUGHT_EXCEPTION);
    }

    return true;
  }
};

class SendPushSubscriptionChangeEventRunnable final : public ExtendableEventWorkerRunnable
{

public:
  explicit SendPushSubscriptionChangeEventRunnable(
    WorkerPrivate* aWorkerPrivate, KeepAliveToken* aKeepAliveToken)
      : ExtendableEventWorkerRunnable(aWorkerPrivate, aKeepAliveToken)
  {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_ASSERT(aWorkerPrivate);

    RefPtr<EventTarget> target = aWorkerPrivate->GlobalScope();

    ExtendableEventInit init;
    init.mBubbles = false;
    init.mCancelable = false;

    RefPtr<ExtendableEvent> event =
      ExtendableEvent::Constructor(target,
                                   NS_LITERAL_STRING("pushsubscriptionchange"),
                                   init);

    event->SetTrusted(true);

    DispatchExtendableEventOnWorkerScope(aCx, aWorkerPrivate->GlobalScope(),
                                         event, nullptr);

    return true;
  }
};

} // anonymous namespace

nsresult
ServiceWorkerPrivate::SendPushEvent(const nsAString& aMessageId,
                                    const Maybe<nsTArray<uint8_t>>& aData,
                                    ServiceWorkerRegistrationInfo* aRegistration)
{
  nsresult rv = SpawnWorkerIfNeeded(PushEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();

  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> regInfo(
    new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
      "ServiceWorkerRegistrationInfoProxy", aRegistration, false));

  RefPtr<WorkerRunnable> r = new SendPushEventRunnable(mWorkerPrivate,
                                                       token,
                                                       aMessageId,
                                                       aData,
                                                       regInfo);

  if (mInfo->State() == ServiceWorkerState::Activating) {
    mPendingFunctionalEvents.AppendElement(r.forget());
    return NS_OK;
  }

  MOZ_ASSERT(mInfo->State() == ServiceWorkerState::Activated);

  if (NS_WARN_IF(!r->Dispatch())) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

nsresult
ServiceWorkerPrivate::SendPushSubscriptionChangeEvent()
{
  nsresult rv = SpawnWorkerIfNeeded(PushSubscriptionChangeEvent);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();
  RefPtr<WorkerRunnable> r =
    new SendPushSubscriptionChangeEventRunnable(mWorkerPrivate, token);
  if (NS_WARN_IF(!r->Dispatch())) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

namespace {

class AllowWindowInteractionHandler final : public ExtendableEventCallback
                                          , public nsITimerCallback
                                          , public nsINamed
{
  nsCOMPtr<nsITimer> mTimer;
  RefPtr<StrongWorkerRef> mWorkerRef;

  ~AllowWindowInteractionHandler()
  {
    // We must either fail to initialize or call ClearWindowAllowed.
    MOZ_DIAGNOSTIC_ASSERT(!mTimer);
    MOZ_DIAGNOSTIC_ASSERT(!mWorkerRef);
  }

  void
  ClearWindowAllowed(WorkerPrivate* aWorkerPrivate)
  {
    MOZ_ASSERT(aWorkerPrivate);
    aWorkerPrivate->AssertIsOnWorkerThread();

    if (!mTimer) {
      return;
    }

    // XXXcatalinb: This *might* be executed after the global was unrooted, in
    // which case GlobalScope() will return null. Making the check here just
    // to be safe.
    WorkerGlobalScope* globalScope = aWorkerPrivate->GlobalScope();
    if (!globalScope) {
      return;
    }

    globalScope->ConsumeWindowInteraction();
    mTimer->Cancel();
    mTimer = nullptr;

    mWorkerRef = nullptr;
  }

  void
  StartClearWindowTimer(WorkerPrivate* aWorkerPrivate)
  {
    MOZ_ASSERT(aWorkerPrivate);
    aWorkerPrivate->AssertIsOnWorkerThread();
    MOZ_ASSERT(!mTimer);

    nsresult rv;
    nsCOMPtr<nsITimer> timer = NS_NewTimer(aWorkerPrivate->ControlEventTarget());
    if (NS_WARN_IF(!timer)) {
      return;
    }

    MOZ_ASSERT(!mWorkerRef);
    RefPtr<AllowWindowInteractionHandler> self = this;
    mWorkerRef =
      StrongWorkerRef::Create(aWorkerPrivate,
                              "AllowWindowInteractionHandler",
                              [self]() {
        // We could try to hold the worker alive until the timer fires, but
        // other APIs are not likely to work in this partially shutdown state.
        // We might as well let the worker thread exit.
        self->ClearWindowAllowed(self->mWorkerRef->Private());
      });

    if (!mWorkerRef) {
      return;
    }

    aWorkerPrivate->GlobalScope()->AllowWindowInteraction();
    timer.swap(mTimer);

    // We swap first and then initialize the timer so that even if initializing
    // fails, we still clean the busy count and interaction count correctly.
    // The timer can't be initialized before modifying the busy count since the
    // timer thread could run and call the timeout but the worker may
    // already be terminating and modifying the busy count could fail.
    rv = mTimer->InitWithCallback(this,
                                  gDOMDisableOpenClickDelay,
                                  nsITimer::TYPE_ONE_SHOT);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      ClearWindowAllowed(aWorkerPrivate);
      return;
    }
  }

  // nsITimerCallback virtual methods
  NS_IMETHOD
  Notify(nsITimer* aTimer) override
  {
    MOZ_DIAGNOSTIC_ASSERT(mTimer == aTimer);
    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
    ClearWindowAllowed(workerPrivate);
    return NS_OK;
  }

  // nsINamed virtual methods
  NS_IMETHOD
  GetName(nsACString& aName) override
  {
    aName.AssignLiteral("AllowWindowInteractionHandler");
    return NS_OK;
  }

public:
  NS_DECL_THREADSAFE_ISUPPORTS

  explicit AllowWindowInteractionHandler(WorkerPrivate* aWorkerPrivate)
  {
    StartClearWindowTimer(aWorkerPrivate);
  }

  void
  FinishedWithResult(ExtendableEventResult /* aResult */) override
  {
    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
    ClearWindowAllowed(workerPrivate);
  }
};

NS_IMPL_ISUPPORTS(AllowWindowInteractionHandler, nsITimerCallback, nsINamed)

class SendNotificationEventRunnable final : public ExtendableEventWorkerRunnable
{
  const nsString mEventName;
  const nsString mID;
  const nsString mTitle;
  const nsString mDir;
  const nsString mLang;
  const nsString mBody;
  const nsString mTag;
  const nsString mIcon;
  const nsString mData;
  const nsString mBehavior;
  const nsString mScope;

public:
  SendNotificationEventRunnable(WorkerPrivate* aWorkerPrivate,
                                KeepAliveToken* aKeepAliveToken,
                                const nsAString& aEventName,
                                const nsAString& aID,
                                const nsAString& aTitle,
                                const nsAString& aDir,
                                const nsAString& aLang,
                                const nsAString& aBody,
                                const nsAString& aTag,
                                const nsAString& aIcon,
                                const nsAString& aData,
                                const nsAString& aBehavior,
                                const nsAString& aScope)
      : ExtendableEventWorkerRunnable(aWorkerPrivate, aKeepAliveToken)
      , mEventName(aEventName)
      , mID(aID)
      , mTitle(aTitle)
      , mDir(aDir)
      , mLang(aLang)
      , mBody(aBody)
      , mTag(aTag)
      , mIcon(aIcon)
      , mData(aData)
      , mBehavior(aBehavior)
      , mScope(aScope)
  {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_ASSERT(aWorkerPrivate);

    RefPtr<EventTarget> target = do_QueryObject(aWorkerPrivate->GlobalScope());

    ErrorResult result;
    RefPtr<Notification> notification =
      Notification::ConstructFromFields(aWorkerPrivate->GlobalScope(), mID,
                                        mTitle, mDir, mLang, mBody, mTag, mIcon,
                                        mData, mScope, result);
    if (NS_WARN_IF(result.Failed())) {
      return false;
    }

    NotificationEventInit nei;
    nei.mNotification = notification;
    nei.mBubbles = false;
    nei.mCancelable = false;

    RefPtr<NotificationEvent> event =
      NotificationEvent::Constructor(target, mEventName,
                                     nei, result);
    if (NS_WARN_IF(result.Failed())) {
      return false;
    }

    event->SetTrusted(true);

    RefPtr<AllowWindowInteractionHandler> allowWindowInteraction;
    if (mEventName.EqualsLiteral(NOTIFICATION_CLICK_EVENT_NAME)) {
      allowWindowInteraction =
        new AllowWindowInteractionHandler(aWorkerPrivate);
    }

    nsresult rv = DispatchExtendableEventOnWorkerScope(aCx,
                                                       aWorkerPrivate->GlobalScope(),
                                                       event,
                                                       allowWindowInteraction);
    // Don't reject when catching an exception
    if (NS_FAILED(rv) && rv != NS_ERROR_XPC_JS_THREW_EXCEPTION &&
        allowWindowInteraction) {
      allowWindowInteraction->FinishedWithResult(Rejected);
    }

    return true;
  }
};

} // namespace anonymous

nsresult
ServiceWorkerPrivate::SendNotificationEvent(const nsAString& aEventName,
                                            const nsAString& aID,
                                            const nsAString& aTitle,
                                            const nsAString& aDir,
                                            const nsAString& aLang,
                                            const nsAString& aBody,
                                            const nsAString& aTag,
                                            const nsAString& aIcon,
                                            const nsAString& aData,
                                            const nsAString& aBehavior,
                                            const nsAString& aScope)
{
  WakeUpReason why;
  if (aEventName.EqualsLiteral(NOTIFICATION_CLICK_EVENT_NAME)) {
    why = NotificationClickEvent;
    gDOMDisableOpenClickDelay =
      Preferences::GetInt("dom.serviceWorkers.disable_open_click_delay");
  } else if (aEventName.EqualsLiteral(NOTIFICATION_CLOSE_EVENT_NAME)) {
    why = NotificationCloseEvent;
  } else {
    MOZ_ASSERT_UNREACHABLE("Invalid notification event name");
    return NS_ERROR_FAILURE;
  }

  nsresult rv = SpawnWorkerIfNeeded(why);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();

  RefPtr<WorkerRunnable> r =
    new SendNotificationEventRunnable(mWorkerPrivate, token,
                                      aEventName, aID, aTitle, aDir, aLang,
                                      aBody, aTag, aIcon, aData, aBehavior,
                                      aScope);
  if (NS_WARN_IF(!r->Dispatch())) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

namespace {

// Inheriting ExtendableEventWorkerRunnable so that the worker is not terminated
// while handling the fetch event, though that's very unlikely.
class FetchEventRunnable : public ExtendableFunctionalEventWorkerRunnable
                         , public nsIHttpHeaderVisitor {
  nsMainThreadPtrHandle<nsIInterceptedChannel> mInterceptedChannel;
  const nsCString mScriptSpec;
  nsTArray<nsCString> mHeaderNames;
  nsTArray<nsCString> mHeaderValues;
  nsCString mSpec;
  nsCString mFragment;
  nsCString mMethod;
  nsString mClientId;
  bool mIsReload;
  bool mMarkLaunchServiceWorkerEnd;
  RequestCache mCacheMode;
  RequestMode mRequestMode;
  RequestRedirect mRequestRedirect;
  RequestCredentials mRequestCredentials;
  nsContentPolicyType mContentPolicyType;
  nsCOMPtr<nsIInputStream> mUploadStream;
  int64_t mUploadStreamContentLength;
  nsCString mReferrer;
  ReferrerPolicy mReferrerPolicy;
  nsString mIntegrity;
public:
  FetchEventRunnable(WorkerPrivate* aWorkerPrivate,
                     KeepAliveToken* aKeepAliveToken,
                     nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel,
                     // CSP checks might require the worker script spec
                     // later on.
                     const nsACString& aScriptSpec,
                     nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
                     const nsAString& aClientId,
                     bool aIsReload,
                     bool aMarkLaunchServiceWorkerEnd)
    : ExtendableFunctionalEventWorkerRunnable(
        aWorkerPrivate, aKeepAliveToken, aRegistration)
    , mInterceptedChannel(aChannel)
    , mScriptSpec(aScriptSpec)
    , mClientId(aClientId)
    , mIsReload(aIsReload)
    , mMarkLaunchServiceWorkerEnd(aMarkLaunchServiceWorkerEnd)
    , mCacheMode(RequestCache::Default)
    , mRequestMode(RequestMode::No_cors)
    , mRequestRedirect(RequestRedirect::Follow)
    // By default we set it to same-origin since normal HTTP fetches always
    // send credentials to same-origin websites unless explicitly forbidden.
    , mRequestCredentials(RequestCredentials::Same_origin)
    , mContentPolicyType(nsIContentPolicy::TYPE_INVALID)
    , mUploadStreamContentLength(-1)
    , mReferrer(kFETCH_CLIENT_REFERRER_STR)
    , mReferrerPolicy(ReferrerPolicy::_empty)
  {
    MOZ_ASSERT(aWorkerPrivate);
  }

  NS_DECL_ISUPPORTS_INHERITED

  NS_IMETHOD
  VisitHeader(const nsACString& aHeader, const nsACString& aValue) override
  {
    mHeaderNames.AppendElement(aHeader);
    mHeaderValues.AppendElement(aValue);
    return NS_OK;
  }

  nsresult
  Init()
  {
    MOZ_ASSERT(NS_IsMainThread());
    nsCOMPtr<nsIChannel> channel;
    nsresult rv = mInterceptedChannel->GetChannel(getter_AddRefs(channel));
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIURI> uri;
    rv = mInterceptedChannel->GetSecureUpgradedChannelURI(getter_AddRefs(uri));
    NS_ENSURE_SUCCESS(rv, rv);

    // Normally we rely on the Request constructor to strip the fragment, but
    // when creating the FetchEvent we bypass the constructor.  So strip the
    // fragment manually here instead.  We can't do it later when we create
    // the Request because that code executes off the main thread.
    nsCOMPtr<nsIURI> uriNoFragment;
    rv = uri->CloneIgnoringRef(getter_AddRefs(uriNoFragment));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = uriNoFragment->GetSpec(mSpec);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = uri->GetRef(mFragment);
    NS_ENSURE_SUCCESS(rv, rv);

    uint32_t loadFlags;
    rv = channel->GetLoadFlags(&loadFlags);
    NS_ENSURE_SUCCESS(rv, rv);
    nsCOMPtr<nsILoadInfo> loadInfo;
    rv = channel->GetLoadInfo(getter_AddRefs(loadInfo));
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ENSURE_STATE(loadInfo);
    mContentPolicyType = loadInfo->InternalContentPolicyType();


    nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(channel);
    MOZ_ASSERT(httpChannel, "How come we don't have an HTTP channel?");

    nsAutoCString referrer;
    // Ignore the return value since the Referer header may not exist.
    Unused << httpChannel->GetRequestHeader(NS_LITERAL_CSTRING("Referer"),
                                            referrer);
    if (!referrer.IsEmpty()) {
      mReferrer = referrer;
    } else {
      // If there's no referrer Header, means the header was omitted for
      // security/privacy reason.
      mReferrer = EmptyCString();
    }

    uint32_t referrerPolicy = 0;
    rv = httpChannel->GetReferrerPolicy(&referrerPolicy);
    NS_ENSURE_SUCCESS(rv, rv);
    switch (referrerPolicy) {
      case nsIHttpChannel::REFERRER_POLICY_UNSET:
      mReferrerPolicy = ReferrerPolicy::_empty;
      break;
    case nsIHttpChannel::REFERRER_POLICY_NO_REFERRER:
      mReferrerPolicy = ReferrerPolicy::No_referrer;
      break;
    case nsIHttpChannel::REFERRER_POLICY_ORIGIN:
      mReferrerPolicy = ReferrerPolicy::Origin;
      break;
    case nsIHttpChannel::REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE:
      mReferrerPolicy = ReferrerPolicy::No_referrer_when_downgrade;
      break;
    case nsIHttpChannel::REFERRER_POLICY_ORIGIN_WHEN_XORIGIN:
      mReferrerPolicy = ReferrerPolicy::Origin_when_cross_origin;
      break;
    case nsIHttpChannel::REFERRER_POLICY_UNSAFE_URL:
      mReferrerPolicy = ReferrerPolicy::Unsafe_url;
      break;
    case nsIHttpChannel::REFERRER_POLICY_SAME_ORIGIN:
      mReferrerPolicy = ReferrerPolicy::Same_origin;
      break;
    case nsIHttpChannel::REFERRER_POLICY_STRICT_ORIGIN_WHEN_XORIGIN:
      mReferrerPolicy = ReferrerPolicy::Strict_origin_when_cross_origin;
      break;
    case nsIHttpChannel::REFERRER_POLICY_STRICT_ORIGIN:
      mReferrerPolicy = ReferrerPolicy::Strict_origin;
      break;
    default:
      MOZ_ASSERT_UNREACHABLE("Invalid Referrer Policy enum value?");
      break;
    }

    rv = httpChannel->GetRequestMethod(mMethod);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIHttpChannelInternal> internalChannel = do_QueryInterface(httpChannel);
    NS_ENSURE_TRUE(internalChannel, NS_ERROR_NOT_AVAILABLE);

    mRequestMode = InternalRequest::MapChannelToRequestMode(channel);

    // This is safe due to static_asserts in ServiceWorkerManager.cpp.
    uint32_t redirectMode;
    rv = internalChannel->GetRedirectMode(&redirectMode);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    mRequestRedirect = static_cast<RequestRedirect>(redirectMode);

    // This is safe due to static_asserts in ServiceWorkerManager.cpp.
    uint32_t cacheMode;
    rv = internalChannel->GetFetchCacheMode(&cacheMode);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    mCacheMode = static_cast<RequestCache>(cacheMode);

    rv = internalChannel->GetIntegrityMetadata(mIntegrity);
    MOZ_ASSERT(NS_SUCCEEDED(rv));

    mRequestCredentials = InternalRequest::MapChannelToRequestCredentials(channel);

    rv = httpChannel->VisitNonDefaultRequestHeaders(this);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIUploadChannel2> uploadChannel = do_QueryInterface(httpChannel);
    if (uploadChannel) {
      MOZ_ASSERT(!mUploadStream);
      nsCOMPtr<nsIInputStream> uploadStream;
      rv = uploadChannel->CloneUploadStream(&mUploadStreamContentLength,
                                            getter_AddRefs(uploadStream));
      NS_ENSURE_SUCCESS(rv, rv);
      mUploadStream = uploadStream;
    }

    return NS_OK;
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_ASSERT(aWorkerPrivate);

    if (mMarkLaunchServiceWorkerEnd) {
      mInterceptedChannel->SetLaunchServiceWorkerEnd(TimeStamp::Now());

      // A probe to measure sw launch time for telemetry.
      TimeStamp launchStartTime = TimeStamp();
      mInterceptedChannel->GetLaunchServiceWorkerStart(&launchStartTime);

      TimeStamp launchEndTime = TimeStamp();
      mInterceptedChannel->GetLaunchServiceWorkerEnd(&launchEndTime);
      Telemetry::AccumulateTimeDelta(Telemetry::SERVICE_WORKER_LAUNCH_TIME,
                                     launchStartTime, launchEndTime);
    }

    mInterceptedChannel->SetDispatchFetchEventEnd(TimeStamp::Now());
    return DispatchFetchEvent(aCx, aWorkerPrivate);
  }

  nsresult
  Cancel() override
  {
    nsCOMPtr<nsIRunnable> runnable = new ResumeRequest(mInterceptedChannel);
    if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable))) {
      NS_WARNING("Failed to resume channel on FetchEventRunnable::Cancel()!\n");
    }
    WorkerRunnable::Cancel();
    return NS_OK;
  }

private:
  ~FetchEventRunnable() {}

  class ResumeRequest final : public Runnable {
    nsMainThreadPtrHandle<nsIInterceptedChannel> mChannel;
  public:
    explicit ResumeRequest(
      nsMainThreadPtrHandle<nsIInterceptedChannel>& aChannel)
      : Runnable("dom::FetchEventRunnable::ResumeRequest")
      , mChannel(aChannel)
    {
      mChannel->SetFinishResponseStart(TimeStamp::Now());
    }

    NS_IMETHOD Run() override
    {
      MOZ_ASSERT(NS_IsMainThread());

      TimeStamp timeStamp = TimeStamp::Now();
      mChannel->SetHandleFetchEventEnd(timeStamp);
      mChannel->SetChannelResetEnd(timeStamp);
      mChannel->SaveTimeStamps();

      nsresult rv = mChannel->ResetInterception();
      if (NS_FAILED(rv)) {
        NS_WARNING("Failed to resume intercepted network request");
        mChannel->CancelInterception(rv);
      }
      return rv;
    }
  };

  bool
  DispatchFetchEvent(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
  {
    MOZ_ASSERT(aCx);
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aWorkerPrivate->IsServiceWorker());
    GlobalObject globalObj(aCx, aWorkerPrivate->GlobalScope()->GetWrapper());

    RefPtr<InternalHeaders> internalHeaders = new InternalHeaders(HeadersGuardEnum::Request);
    MOZ_ASSERT(mHeaderNames.Length() == mHeaderValues.Length());
    for (uint32_t i = 0; i < mHeaderNames.Length(); i++) {
      ErrorResult result;
      internalHeaders->Set(mHeaderNames[i], mHeaderValues[i], result);
      if (NS_WARN_IF(result.Failed())) {
        result.SuppressException();
        return false;
      }
    }

    ErrorResult result;
    internalHeaders->SetGuard(HeadersGuardEnum::Immutable, result);
    if (NS_WARN_IF(result.Failed())) {
      result.SuppressException();
      return false;
    }
    RefPtr<InternalRequest> internalReq = new InternalRequest(mSpec,
                                                              mFragment,
                                                              mMethod,
                                                              internalHeaders.forget(),
                                                              mCacheMode,
                                                              mRequestMode,
                                                              mRequestRedirect,
                                                              mRequestCredentials,
                                                              NS_ConvertUTF8toUTF16(mReferrer),
                                                              mReferrerPolicy,
                                                              mContentPolicyType,
                                                              mIntegrity);
    internalReq->SetBody(mUploadStream, mUploadStreamContentLength);
    // For Telemetry, note that this Request object was created by a Fetch event.
    internalReq->SetCreatedByFetchEvent();

    nsCOMPtr<nsIChannel> channel;
    nsresult rv = mInterceptedChannel->GetChannel(getter_AddRefs(channel));
    NS_ENSURE_SUCCESS(rv, false);

    nsAutoCString alternativeDataType;
    nsCOMPtr<nsICacheInfoChannel> cic = do_QueryInterface(channel);
    if (cic &&
        NS_SUCCEEDED(cic->GetPreferredAlternativeDataType(alternativeDataType)) &&
        !alternativeDataType.IsEmpty()) {
      internalReq->SetPreferredAlternativeDataType(alternativeDataType);
    }

    nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(globalObj.GetAsSupports());
    if (NS_WARN_IF(!global)) {
      return false;
    }

    // TODO This request object should be created with a AbortSignal object
    // which should be aborted if the loading is aborted. See bug 1394102.
    RefPtr<Request> request = new Request(global, internalReq, nullptr);

    MOZ_ASSERT_IF(internalReq->IsNavigationRequest(),
                  request->Redirect() == RequestRedirect::Manual);

    RootedDictionary<FetchEventInit> init(aCx);
    init.mRequest = request;
    init.mBubbles = false;
    init.mCancelable = true;
    // Only expose the FetchEvent.clientId on subresource requests for now.
    // Once we implement .resultingClientId and .targetClientId we can then
    // start exposing .clientId on non-subresource requests as well.  See
    // bug 1264177.
    if (!mClientId.IsEmpty() && !internalReq->IsNavigationRequest()) {
      init.mClientId = mClientId;
    }
    init.mIsReload = mIsReload;
    RefPtr<FetchEvent> event =
      FetchEvent::Constructor(globalObj, NS_LITERAL_STRING("fetch"), init, result);
    if (NS_WARN_IF(result.Failed())) {
      result.SuppressException();
      return false;
    }

    event->PostInit(mInterceptedChannel, mRegistration, mScriptSpec);
    event->SetTrusted(true);

    mInterceptedChannel->SetHandleFetchEventStart(TimeStamp::Now());

    nsresult rv2 =
      DispatchExtendableEventOnWorkerScope(aCx, aWorkerPrivate->GlobalScope(),
                                           event, nullptr);
    if ((NS_WARN_IF(NS_FAILED(rv2)) && rv2 != NS_ERROR_XPC_JS_THREW_EXCEPTION) ||
        !event->WaitToRespond()) {
      nsCOMPtr<nsIRunnable> runnable;
      MOZ_ASSERT(!aWorkerPrivate->UsesSystemPrincipal(),
                 "We don't support system-principal serviceworkers");
      if (event->DefaultPrevented(CallerType::NonSystem)) {
        runnable = new CancelChannelRunnable(mInterceptedChannel,
                                             mRegistration,
                                             NS_ERROR_INTERCEPTION_FAILED);
      } else {
        runnable = new ResumeRequest(mInterceptedChannel);
      }

      MOZ_ALWAYS_SUCCEEDS(mWorkerPrivate->DispatchToMainThread(runnable.forget()));
    }

    return true;
  }
};

NS_IMPL_ISUPPORTS_INHERITED(FetchEventRunnable, WorkerRunnable, nsIHttpHeaderVisitor)

} // anonymous namespace

nsresult
ServiceWorkerPrivate::SendFetchEvent(nsIInterceptedChannel* aChannel,
                                     nsILoadGroup* aLoadGroup,
                                     const nsAString& aClientId, bool aIsReload)
{
  MOZ_ASSERT(NS_IsMainThread());

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  if (NS_WARN_IF(!mInfo || !swm)) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<ServiceWorkerRegistrationInfo> registration =
    swm->GetRegistration(mInfo->Principal(), mInfo->Scope());

  // Its possible the registration is removed between starting the interception
  // and actually dispatching the fetch event.  In these cases we simply
  // want to restart the original network request.  Since this is a normal
  // condition we handle the reset here instead of returning an error which
  // would in turn trigger a console report.
  if (!registration) {
    nsresult rv = aChannel->ResetInterception();
    if (NS_FAILED(rv)) {
      NS_WARNING("Failed to resume intercepted network request");
      aChannel->CancelInterception(rv);
    }
    return NS_OK;
  }

  // Handle Fetch algorithm - step 16. If the service worker didn't register
  // any fetch event handlers, then abort the interception and maybe trigger
  // the soft update algorithm.
  if (!mInfo->HandlesFetch()) {
    nsresult rv = aChannel->ResetInterception();
    if (NS_FAILED(rv)) {
      NS_WARNING("Failed to resume intercepted network request");
      aChannel->CancelInterception(rv);
    }

    // Trigger soft updates if necessary.
    registration->MaybeScheduleTimeCheckAndUpdate();

    return NS_OK;
  }

  aChannel->SetLaunchServiceWorkerStart(TimeStamp::Now());
  aChannel->SetDispatchFetchEventStart(TimeStamp::Now());

  bool newWorkerCreated = false;
  nsresult rv = SpawnWorkerIfNeeded(FetchEvent,
                                    &newWorkerCreated,
                                    aLoadGroup);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!newWorkerCreated) {
    aChannel->SetLaunchServiceWorkerEnd(TimeStamp::Now());
  }

  nsMainThreadPtrHandle<nsIInterceptedChannel> handle(
    new nsMainThreadPtrHolder<nsIInterceptedChannel>(
      "nsIInterceptedChannel", aChannel, false));

  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> regInfo(
    new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
      "ServiceWorkerRegistrationInfoProxy", registration, false));

  RefPtr<KeepAliveToken> token = CreateEventKeepAliveToken();


  RefPtr<FetchEventRunnable> r =
    new FetchEventRunnable(mWorkerPrivate, token, handle,
                           mInfo->ScriptSpec(), regInfo,
                           aClientId, aIsReload, newWorkerCreated);
  rv = r->Init();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (mInfo->State() == ServiceWorkerState::Activating) {
    mPendingFunctionalEvents.AppendElement(r.forget());
    return NS_OK;
  }

  MOZ_ASSERT(mInfo->State() == ServiceWorkerState::Activated);

  if (NS_WARN_IF(!r->Dispatch())) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

nsresult
ServiceWorkerPrivate::SpawnWorkerIfNeeded(WakeUpReason aWhy,
                                          bool* aNewWorkerCreated,
                                          nsILoadGroup* aLoadGroup)
{
  MOZ_ASSERT(NS_IsMainThread());

  // Defaults to no new worker created, but if there is one, we'll set the value
  // to true at the end of this function.
  if (aNewWorkerCreated) {
    *aNewWorkerCreated = false;
  }

  // If the worker started shutting down on itself we may have a stale
  // reference here.  Invoke our termination code to clean it out.
  if (mWorkerPrivate && mWorkerPrivate->ParentStatusProtected() > Running) {
    TerminateWorker();
    MOZ_DIAGNOSTIC_ASSERT(!mWorkerPrivate);
  }

  if (mWorkerPrivate) {
    // If we have a load group here then use it to update the service worker
    // load group.  This was added when we needed the load group's tab child
    // to pass some security checks.  Those security checks are gone, though,
    // and we could possibly remove this now.  For now we just do it
    // opportunistically.  When the service worker is running in a separate
    // process from the client that initiated the intercepted channel, then
    // the load group will be nullptr.  UpdateOverrideLoadGroup ignores nullptr
    // load groups.
    mWorkerPrivate->UpdateOverridenLoadGroup(aLoadGroup);
    RenewKeepAliveToken(aWhy);

    return NS_OK;
  }

  // Sanity check: mSupportsArray should be empty if we're about to
  // spin up a new worker.
  MOZ_ASSERT(mSupportsArray.IsEmpty());

  if (NS_WARN_IF(!mInfo)) {
    NS_WARNING("Trying to wake up a dead service worker.");
    return NS_ERROR_FAILURE;
  }

  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
  NS_ENSURE_TRUE(swm, NS_ERROR_FAILURE);

  RefPtr<ServiceWorkerRegistrationInfo> reg =
    swm->GetRegistration(mInfo->Principal(), mInfo->Scope());
  NS_ENSURE_TRUE(reg, NS_ERROR_FAILURE);

  // TODO(catalinb): Bug 1192138 - Add telemetry for service worker wake-ups.

  // Ensure that the IndexedDatabaseManager is initialized
  Unused << NS_WARN_IF(!IndexedDatabaseManager::GetOrCreate());

  WorkerLoadInfo info;
  nsresult rv = NS_NewURI(getter_AddRefs(info.mBaseURI), mInfo->ScriptSpec(),
                          nullptr, nullptr);

  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  info.mResolvedScriptURI = info.mBaseURI;
  MOZ_ASSERT(!mInfo->CacheName().IsEmpty());
  info.mServiceWorkerCacheName = mInfo->CacheName();

  info.mServiceWorkerDescriptor.emplace(mInfo->Descriptor());
  info.mServiceWorkerRegistrationDescriptor.emplace(reg->Descriptor());

  info.mLoadGroup = aLoadGroup;

  // If we are loading a script for a ServiceWorker then we must not
  // try to intercept it.  If the interception matches the current
  // ServiceWorker's scope then we could deadlock the load.
  info.mLoadFlags = mInfo->GetImportsLoadFlags() |
                    nsIChannel::LOAD_BYPASS_SERVICE_WORKER;

  rv = info.mBaseURI->GetHost(info.mDomain);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  nsCOMPtr<nsIURI> uri;
  rv = mInfo->Principal()->GetURI(getter_AddRefs(uri));
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (NS_WARN_IF(!uri)) {
    return NS_ERROR_FAILURE;
  }

  // Create a pristine codebase principal to avoid any possibility of inheriting
  // CSP values.  The principal on the registration may be polluted with CSP
  // from the registering page or other places the principal is passed.  If
  // bug 965637 is ever fixed this can be removed.
  info.mPrincipal =
    BasePrincipal::CreateCodebasePrincipal(uri, mInfo->GetOriginAttributes());
  if (NS_WARN_IF(!info.mPrincipal)) {
    return NS_ERROR_FAILURE;
  }
  info.mLoadingPrincipal = info.mPrincipal;

  nsContentUtils::StorageAccess access =
    nsContentUtils::StorageAllowedForPrincipal(info.mPrincipal);
  info.mStorageAllowed = access > nsContentUtils::StorageAccess::ePrivateBrowsing;
  info.mOriginAttributes = mInfo->GetOriginAttributes();

  // Verify that we don't have any CSP on pristine principal.
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
  nsCOMPtr<nsIContentSecurityPolicy> csp;
  Unused << info.mPrincipal->GetCsp(getter_AddRefs(csp));
  MOZ_DIAGNOSTIC_ASSERT(!csp);
#endif

  // Default CSP permissions for now.  These will be overrided if necessary
  // based on the script CSP headers during load in ScriptLoader.
  info.mEvalAllowed = true;
  info.mReportCSPViolations = false;

  WorkerPrivate::OverrideLoadInfoLoadGroup(info, info.mPrincipal);

  rv = info.SetPrincipalOnMainThread(info.mPrincipal, info.mLoadGroup);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  AutoJSAPI jsapi;
  jsapi.Init();
  ErrorResult error;
  NS_ConvertUTF8toUTF16 scriptSpec(mInfo->ScriptSpec());

  mWorkerPrivate = WorkerPrivate::Constructor(jsapi.cx(),
                                              scriptSpec,
                                              false, WorkerTypeService,
                                              VoidString(),
                                              EmptyCString(),
                                              &info, error);
  if (NS_WARN_IF(error.Failed())) {
    return error.StealNSResult();
  }

  RenewKeepAliveToken(aWhy);

  if (aNewWorkerCreated) {
    *aNewWorkerCreated = true;
  }

  return NS_OK;
}

bool
ServiceWorkerPrivate::MaybeStoreISupports(nsISupports* aSupports)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (!mWorkerPrivate) {
    MOZ_DIAGNOSTIC_ASSERT(mSupportsArray.IsEmpty());
    return false;
  }

  MOZ_ASSERT(!mSupportsArray.Contains(aSupports));
  mSupportsArray.AppendElement(aSupports);
  return true;
}

void
ServiceWorkerPrivate::RemoveISupports(nsISupports* aSupports)
{
  MOZ_ASSERT(NS_IsMainThread());
  mSupportsArray.RemoveElement(aSupports);
}

void
ServiceWorkerPrivate::TerminateWorker()
{
  MOZ_ASSERT(NS_IsMainThread());

  mIdleWorkerTimer->Cancel();
  mIdleKeepAliveToken = nullptr;
  if (mWorkerPrivate) {
    if (DOMPrefs::ServiceWorkersTestingEnabled()) {
      nsCOMPtr<nsIObserverService> os = services::GetObserverService();
      if (os) {
        os->NotifyObservers(nullptr, "service-worker-shutdown", nullptr);
      }
    }

    Unused << NS_WARN_IF(!mWorkerPrivate->Cancel());
    mWorkerPrivate = nullptr;
    mSupportsArray.Clear();

    // Any pending events are never going to fire on this worker.  Cancel
    // them so that intercepted channels can be reset and other resources
    // cleaned up.
    nsTArray<RefPtr<WorkerRunnable>> pendingEvents;
    mPendingFunctionalEvents.SwapElements(pendingEvents);
    for (uint32_t i = 0; i < pendingEvents.Length(); ++i) {
      pendingEvents[i]->Cancel();
    }
  }
}

void
ServiceWorkerPrivate::NoteDeadServiceWorkerInfo()
{
  MOZ_ASSERT(NS_IsMainThread());
  mInfo = nullptr;
  TerminateWorker();
}

namespace {

class UpdateStateControlRunnable final : public MainThreadWorkerControlRunnable
{
  const ServiceWorkerState mState;

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_DIAGNOSTIC_ASSERT(aWorkerPrivate);
    aWorkerPrivate->UpdateServiceWorkerState(mState);
    return true;
  }

public:
  UpdateStateControlRunnable(WorkerPrivate* aWorkerPrivate,
                             ServiceWorkerState aState)
    : MainThreadWorkerControlRunnable(aWorkerPrivate)
    , mState(aState)
  {
  }
};

} // anonymous namespace

void
ServiceWorkerPrivate::UpdateState(ServiceWorkerState aState)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (!mWorkerPrivate) {
    MOZ_DIAGNOSTIC_ASSERT(mPendingFunctionalEvents.IsEmpty());
    return;
  }

  RefPtr<WorkerRunnable> r =
    new UpdateStateControlRunnable(mWorkerPrivate, aState);
  Unused << r->Dispatch();

  if (aState != ServiceWorkerState::Activated) {
    return;
  }

  nsTArray<RefPtr<WorkerRunnable>> pendingEvents;
  mPendingFunctionalEvents.SwapElements(pendingEvents);

  for (uint32_t i = 0; i < pendingEvents.Length(); ++i) {
    RefPtr<WorkerRunnable> r = pendingEvents[i].forget();
    if (NS_WARN_IF(!r->Dispatch())) {
      NS_WARNING("Failed to dispatch pending functional event!");
    }
  }
}

nsresult
ServiceWorkerPrivate::GetDebugger(nsIWorkerDebugger** aResult)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aResult);

  if (!mDebuggerCount) {
    return NS_OK;
  }

  MOZ_ASSERT(mWorkerPrivate);

  nsCOMPtr<nsIWorkerDebugger> debugger = do_QueryInterface(mWorkerPrivate->Debugger());
  debugger.forget(aResult);

  return NS_OK;
}

nsresult
ServiceWorkerPrivate::AttachDebugger()
{
  MOZ_ASSERT(NS_IsMainThread());

  // When the first debugger attaches to a worker, we spawn a worker if needed,
  // and cancel the idle timeout. The idle timeout should not be reset until
  // the last debugger detached from the worker.
  if (!mDebuggerCount) {
    nsresult rv = SpawnWorkerIfNeeded(AttachEvent);
    NS_ENSURE_SUCCESS(rv, rv);

    mIdleWorkerTimer->Cancel();
  }

  ++mDebuggerCount;

  return NS_OK;
}

nsresult
ServiceWorkerPrivate::DetachDebugger()
{
  MOZ_ASSERT(NS_IsMainThread());

  if (!mDebuggerCount) {
    return NS_ERROR_UNEXPECTED;
  }

  --mDebuggerCount;

  // When the last debugger detaches from a worker, we either reset the idle
  // timeout, or terminate the worker if there are no more active tokens.
  if (!mDebuggerCount) {
    if (mTokenCount) {
      ResetIdleTimeout();
    } else {
      TerminateWorker();
    }
  }

  return NS_OK;
}

bool
ServiceWorkerPrivate::IsIdle() const
{
  MOZ_ASSERT(NS_IsMainThread());
  return mTokenCount == 0 || (mTokenCount == 1 && mIdleKeepAliveToken);
}

namespace {

class ServiceWorkerPrivateTimerCallback final : public nsITimerCallback
                                              , public nsINamed
{
public:
  typedef void (ServiceWorkerPrivate::*Method)(nsITimer*);

  ServiceWorkerPrivateTimerCallback(ServiceWorkerPrivate* aServiceWorkerPrivate,
                                    Method aMethod)
    : mServiceWorkerPrivate(aServiceWorkerPrivate)
    , mMethod(aMethod)
  {
  }

  NS_IMETHOD
  Notify(nsITimer* aTimer) override
  {
    (mServiceWorkerPrivate->*mMethod)(aTimer);
    mServiceWorkerPrivate = nullptr;
    return NS_OK;
  }

  NS_IMETHOD
  GetName(nsACString& aName) override
  {
    aName.AssignLiteral("ServiceWorkerPrivateTimerCallback");
    return NS_OK;
  }

private:
  ~ServiceWorkerPrivateTimerCallback() = default;

  RefPtr<ServiceWorkerPrivate> mServiceWorkerPrivate;
  Method mMethod;

  NS_DECL_THREADSAFE_ISUPPORTS
};

NS_IMPL_ISUPPORTS(ServiceWorkerPrivateTimerCallback, nsITimerCallback, nsINamed);

} // anonymous namespace

void
ServiceWorkerPrivate::NoteIdleWorkerCallback(nsITimer* aTimer)
{
  MOZ_ASSERT(NS_IsMainThread());

  MOZ_ASSERT(aTimer == mIdleWorkerTimer, "Invalid timer!");

  // Release ServiceWorkerPrivate's token, since the grace period has ended.
  mIdleKeepAliveToken = nullptr;

  if (mWorkerPrivate) {
    // If we still have a workerPrivate at this point it means there are pending
    // waitUntil promises. Wait a bit more until we forcibly terminate the
    // worker.
    uint32_t timeout = Preferences::GetInt("dom.serviceWorkers.idle_extended_timeout");
    nsCOMPtr<nsITimerCallback> cb = new ServiceWorkerPrivateTimerCallback(
      this, &ServiceWorkerPrivate::TerminateWorkerCallback);
    DebugOnly<nsresult> rv =
      mIdleWorkerTimer->InitWithCallback(cb, timeout, nsITimer::TYPE_ONE_SHOT);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
  }
}

void
ServiceWorkerPrivate::TerminateWorkerCallback(nsITimer* aTimer)
{
  MOZ_ASSERT(NS_IsMainThread());

  MOZ_ASSERT(aTimer == this->mIdleWorkerTimer, "Invalid timer!");

  // mInfo must be non-null at this point because NoteDeadServiceWorkerInfo
  // which zeroes it calls TerminateWorker which cancels our timer which will
  // ensure we don't get invoked even if the nsTimerEvent is in the event queue.
  ServiceWorkerManager::LocalizeAndReportToAllClients(
    mInfo->Scope(),
    "ServiceWorkerGraceTimeoutTermination",
    nsTArray<nsString> { NS_ConvertUTF8toUTF16(mInfo->Scope()) });

  TerminateWorker();
}

void
ServiceWorkerPrivate::RenewKeepAliveToken(WakeUpReason aWhy)
{
  // We should have an active worker if we're renewing the keep alive token.
  MOZ_ASSERT(mWorkerPrivate);

  // If there is at least one debugger attached to the worker, the idle worker
  // timeout was canceled when the first debugger attached to the worker. It
  // should not be reset until the last debugger detaches from the worker.
  if (!mDebuggerCount) {
    ResetIdleTimeout();
  }

  if (!mIdleKeepAliveToken) {
    mIdleKeepAliveToken = new KeepAliveToken(this);
  }
}

void
ServiceWorkerPrivate::ResetIdleTimeout()
{
  uint32_t timeout = Preferences::GetInt("dom.serviceWorkers.idle_timeout");
  nsCOMPtr<nsITimerCallback> cb = new ServiceWorkerPrivateTimerCallback(
    this, &ServiceWorkerPrivate::NoteIdleWorkerCallback);
  DebugOnly<nsresult> rv =
    mIdleWorkerTimer->InitWithCallback(cb, timeout, nsITimer::TYPE_ONE_SHOT);
  MOZ_ASSERT(NS_SUCCEEDED(rv));
}

void
ServiceWorkerPrivate::AddToken()
{
  MOZ_ASSERT(NS_IsMainThread());
  ++mTokenCount;
}

void
ServiceWorkerPrivate::ReleaseToken()
{
  MOZ_ASSERT(NS_IsMainThread());

  MOZ_ASSERT(mTokenCount > 0);
  --mTokenCount;
  if (!mTokenCount) {
    TerminateWorker();
  }

  // mInfo can be nullptr here if NoteDeadServiceWorkerInfo() is called while
  // the KeepAliveToken is being proxy released as a runnable.
  else if (mInfo && IsIdle()) {
    RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
    if (swm) {
      swm->WorkerIsIdle(mInfo);
    }
  }
}

already_AddRefed<KeepAliveToken>
ServiceWorkerPrivate::CreateEventKeepAliveToken()
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mWorkerPrivate);
  MOZ_ASSERT(mIdleKeepAliveToken);
  RefPtr<KeepAliveToken> ref = new KeepAliveToken(this);
  return ref.forget();
}

void
ServiceWorkerPrivate::SetHandlesFetch(bool aValue)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (NS_WARN_IF(!mInfo)) {
    return;
  }

  mInfo->SetHandlesFetch(aValue);
}

} // namespace dom
} // namespace mozilla