mirror of
https://github.com/mozilla/gecko-dev.git
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120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "LockManagerChild.h"
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#include "LockRequestChild.h"
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#include "mozilla/dom/Promise.h"
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#include "mozilla/dom/WorkerPrivate.h"
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namespace mozilla::dom::locks {
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using IPCResult = mozilla::ipc::IPCResult;
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NS_IMPL_ISUPPORTS(LockRequestChild, nsISupports)
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MOZ_CAN_RUN_SCRIPT static void RunCallbackAndSettlePromise(
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LockGrantedCallback& aCallback, mozilla::dom::Lock* lock,
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Promise& aPromise) {
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ErrorResult rv;
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if (RefPtr<Promise> result = aCallback.Call(
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lock, rv, nullptr, CallbackObject::eRethrowExceptions)) {
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aPromise.MaybeResolve(result);
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} else if (rv.Failed() && !rv.IsUncatchableException()) {
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aPromise.MaybeReject(std::move(rv));
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return;
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} else {
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aPromise.MaybeResolveWithUndefined();
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}
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// This is required even with no failure. IgnoredErrorResult is not an option
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// since MaybeReject does not accept it.
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rv.WouldReportJSException();
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if (NS_WARN_IF(rv.IsUncatchableException())) {
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rv.SuppressException(); // XXX: Why does this happen anyway?
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}
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MOZ_ASSERT(!rv.Failed());
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}
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LockRequestChild::LockRequestChild(
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const LockRequest& aRequest,
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const Optional<OwningNonNull<AbortSignal>>& aSignal)
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: mRequest(aRequest) {
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if (aSignal.WasPassed()) {
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Follow(&aSignal.Value());
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}
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}
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void LockRequestChild::MaybeSetWorkerRef() {
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if (!NS_IsMainThread()) {
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mWorkerRef = StrongWorkerRef::Create(
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GetCurrentThreadWorkerPrivate(), "LockManager",
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[self = RefPtr(this)]() { self->mWorkerRef = nullptr; });
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}
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}
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void LockRequestChild::ActorDestroy(ActorDestroyReason aReason) {
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CastedManager()->NotifyRequestDestroy();
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}
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IPCResult LockRequestChild::RecvResolve(const LockMode& aLockMode,
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bool aIsAvailable) {
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Unfollow();
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RefPtr<Lock> lock;
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RefPtr<Promise> promise;
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if (aIsAvailable) {
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IgnoredErrorResult err;
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lock = new Lock(CastedManager()->GetParentObject(), this, mRequest.mName,
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aLockMode, mRequest.mPromise, err);
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if (MOZ_UNLIKELY(err.Failed())) {
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mRequest.mPromise->MaybeRejectWithUnknownError(
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"Failed to allocate a lock");
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return IPC_OK();
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}
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lock->GetWaitingPromise().AppendNativeHandler(lock);
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promise = &lock->GetWaitingPromise();
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} else {
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// We are in `ifAvailable: true` mode and the lock is not available.
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// There is no waitingPromise since there is no lock, so settle the promise
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// from the request instead.
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// This matches "If ifAvailable is true and request is not grantable" step.
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promise = mRequest.mPromise;
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}
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// XXX(krosylight): MOZ_KnownLive shouldn't be needed here, mRequest is const
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RunCallbackAndSettlePromise(MOZ_KnownLive(*mRequest.mCallback), lock,
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*promise);
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return IPC_OK();
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}
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IPCResult LockRequestChild::Recv__delete__(bool aAborted) {
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MOZ_ASSERT(aAborted, "__delete__ is currently only for abort");
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Unfollow();
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mRequest.mPromise->MaybeRejectWithAbortError("The lock request is aborted");
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return IPC_OK();
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}
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void LockRequestChild::RunAbortAlgorithm() {
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AutoJSAPI jsapi;
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if (NS_WARN_IF(
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!jsapi.Init(static_cast<AbortSignal*>(Signal())->GetOwnerGlobal()))) {
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mRequest.mPromise->MaybeRejectWithAbortError("The lock request is aborted");
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} else {
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JSContext* cx = jsapi.cx();
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JS::Rooted<JS::Value> reason(cx);
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Signal()->GetReason(cx, &reason);
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mRequest.mPromise->MaybeReject(reason);
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}
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Unfollow();
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Send__delete__(this, true);
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}
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inline LockManagerChild* LockRequestChild::CastedManager() const {
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return static_cast<LockManagerChild*>(Manager());
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};
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} // namespace mozilla::dom::locks
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