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/* -*- 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,
#include "LockManagerChild.h"
#include "LockRequestChild.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WorkerPrivate.h"
namespace mozilla::dom::locks {
using IPCResult = mozilla::ipc::IPCResult;
NS_IMPL_ISUPPORTS(LockRequestChild, nsISupports)
MOZ_CAN_RUN_SCRIPT static void RunCallbackAndSettlePromise(
LockGrantedCallback& aCallback, mozilla::dom::Lock* lock,
Promise& aPromise) {
ErrorResult rv;
if (RefPtr<Promise> result = aCallback.Call(
lock, rv, nullptr, CallbackObject::eRethrowExceptions)) {
aPromise.MaybeResolve(result);
} else if (rv.Failed() && !rv.IsUncatchableException()) {
aPromise.MaybeReject(std::move(rv));
return;
} else {
aPromise.MaybeResolveWithUndefined();
}
// This is required even with no failure. IgnoredErrorResult is not an option
// since MaybeReject does not accept it.
rv.WouldReportJSException();
if (NS_WARN_IF(rv.IsUncatchableException())) {
rv.SuppressException(); // XXX: Why does this happen anyway?
}
MOZ_ASSERT(!rv.Failed());
}
LockRequestChild::LockRequestChild(
const LockRequest& aRequest,
const Optional<OwningNonNull<AbortSignal>>& aSignal)
: mRequest(aRequest) {
if (aSignal.WasPassed()) {
Follow(&aSignal.Value());
}
}
void LockRequestChild::MaybeSetWorkerRef() {
if (!NS_IsMainThread()) {
mWorkerRef = StrongWorkerRef::Create(
GetCurrentThreadWorkerPrivate(), "LockManager",
[self = RefPtr(this)]() { self->mWorkerRef = nullptr; });
}
}
void LockRequestChild::ActorDestroy(ActorDestroyReason aReason) {
CastedManager()->NotifyRequestDestroy();
}
IPCResult LockRequestChild::RecvResolve(const LockMode& aLockMode,
bool aIsAvailable) {
Unfollow();
RefPtr<Lock> lock;
RefPtr<Promise> promise;
if (aIsAvailable) {
IgnoredErrorResult err;
lock = new Lock(CastedManager()->GetParentObject(), this, mRequest.mName,
aLockMode, mRequest.mPromise, err);
if (MOZ_UNLIKELY(err.Failed())) {
mRequest.mPromise->MaybeRejectWithUnknownError(
"Failed to allocate a lock");
return IPC_OK();
}
lock->GetWaitingPromise().AppendNativeHandler(lock);
promise = &lock->GetWaitingPromise();
} else {
// We are in `ifAvailable: true` mode and the lock is not available.
// There is no waitingPromise since there is no lock, so settle the promise
// from the request instead.
// This matches "If ifAvailable is true and request is not grantable" step.
promise = mRequest.mPromise;
}
// XXX(krosylight): MOZ_KnownLive shouldn't be needed here, mRequest is const
RunCallbackAndSettlePromise(MOZ_KnownLive(*mRequest.mCallback), lock,
*promise);
return IPC_OK();
}
IPCResult LockRequestChild::Recv__delete__(bool aAborted) {
MOZ_ASSERT(aAborted, "__delete__ is currently only for abort");
Unfollow();
mRequest.mPromise->MaybeRejectWithAbortError("The lock request is aborted");
return IPC_OK();
}
void LockRequestChild::RunAbortAlgorithm() {
AutoJSAPI jsapi;
if (NS_WARN_IF(
!jsapi.Init(static_cast<AbortSignal*>(Signal())->GetOwnerGlobal()))) {
mRequest.mPromise->MaybeRejectWithAbortError("The lock request is aborted");
} else {
JSContext* cx = jsapi.cx();
JS::Rooted<JS::Value> reason(cx);
Signal()->GetReason(cx, &reason);
mRequest.mPromise->MaybeReject(reason);
}
Unfollow();
Send__delete__(this, true);
}
inline LockManagerChild* LockRequestChild::CastedManager() const {
return static_cast<LockManagerChild*>(Manager());
};
} // namespace mozilla::dom::locks