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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,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "LockManagerParent.h"
#include "LockRequestParent.h"
#include "mozilla/PrincipalHashKey.h"
#include "mozilla/RefPtr.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/dom/locks/PLockManager.h"
#include "mozilla/media/MediaUtils.h"
#include "nsIDUtils.h"
#include "nsTHashMap.h"
namespace mozilla::dom::locks {
static StaticAutoPtr<nsTHashMap<PrincipalHashKey, WeakPtr<ManagedLocks>>>
sManagedLocksMap;
using IPCResult = mozilla::ipc::IPCResult;
LockManagerParent::LockManagerParent(NotNull<nsIPrincipal*> aPrincipal,
const nsID& aClientId)
: mClientId(NSID_TrimBracketsUTF16(aClientId)), mPrincipal(aPrincipal) {
if (!sManagedLocksMap) {
sManagedLocksMap =
new nsTHashMap<PrincipalHashKey, WeakPtr<ManagedLocks>>();
} else {
mManagedLocks = sManagedLocksMap->Get(aPrincipal);
}
if (!mManagedLocks) {
mManagedLocks = new ManagedLocks();
sManagedLocksMap->LookupOrInsert(aPrincipal, mManagedLocks);
}
}
void LockManagerParent::ActorDestroy(ActorDestroyReason aWhy) {
if (!mManagedLocks) {
return;
}
nsTArray<nsString> affectedResourceNames;
mManagedLocks->mHeldLocks.RemoveElementsBy(
[this, &affectedResourceNames](const RefPtr<LockRequestParent>& request) {
bool equals = request->Manager() == this;
if (equals) {
affectedResourceNames.AppendElement(request->Data().name());
}
return equals;
});
for (auto& queue : mManagedLocks->mQueueMap) {
queue.GetModifiableData()->RemoveElementsBy(
[this, &name = queue.GetKey(),
&affectedResourceNames](const RefPtr<LockRequestParent>& request) {
bool equals = request->Manager() == this;
if (equals) {
affectedResourceNames.AppendElement(name);
}
return equals;
});
}
for (const nsString& name : affectedResourceNames) {
if (auto queue = mManagedLocks->mQueueMap.Lookup(name)) {
ProcessRequestQueue(queue.Data());
}
}
mManagedLocks = nullptr;
// We just decreased the refcount and potentially deleted it, so check whether
// the weak pointer still points to anything and remove the entry if not.
if (!sManagedLocksMap->Get(mPrincipal)) {
sManagedLocksMap->Remove(mPrincipal);
}
}
void LockManagerParent::ProcessRequestQueue(
nsTArray<RefPtr<LockRequestParent>>& aQueue) {
while (aQueue.Length()) {
RefPtr<LockRequestParent> first = aQueue[0];
if (!IsGrantableRequest(first->Data())) {
break;
}
aQueue.RemoveElementAt(0);
mManagedLocks->mHeldLocks.AppendElement(first);
Unused << NS_WARN_IF(!first->SendResolve(first->Data().lockMode(), true));
}
}
bool LockManagerParent::IsGrantableRequest(const IPCLockRequest& aRequest) {
for (const auto& held : mManagedLocks->mHeldLocks) {
if (held->Data().name() == aRequest.name()) {
if (aRequest.lockMode() == LockMode::Exclusive) {
return false;
}
MOZ_ASSERT(aRequest.lockMode() == LockMode::Shared);
if (held->Data().lockMode() == LockMode::Exclusive) {
return false;
}
}
}
return true;
}
IPCResult LockManagerParent::RecvQuery(QueryResolver&& aResolver) {
LockManagerSnapshot snapshot;
snapshot.mHeld.Construct();
snapshot.mPending.Construct();
for (const auto& queueMapEntry : mManagedLocks->mQueueMap) {
for (const RefPtr<LockRequestParent>& request : queueMapEntry.GetData()) {
LockInfo info;
info.mMode.Construct(request->Data().lockMode());
info.mName.Construct(request->Data().name());
info.mClientId.Construct(
static_cast<LockManagerParent*>(request->Manager())->mClientId);
if (!snapshot.mPending.Value().AppendElement(info, mozilla::fallible)) {
return IPC_FAIL(this, "Out of memory");
};
}
}
for (const RefPtr<LockRequestParent>& request : mManagedLocks->mHeldLocks) {
LockInfo info;
info.mMode.Construct(request->Data().lockMode());
info.mName.Construct(request->Data().name());
info.mClientId.Construct(
static_cast<LockManagerParent*>(request->Manager())->mClientId);
if (!snapshot.mHeld.Value().AppendElement(info, mozilla::fallible)) {
return IPC_FAIL(this, "Out of memory");
};
}
aResolver(snapshot);
return IPC_OK();
};
already_AddRefed<PLockRequestParent> LockManagerParent::AllocPLockRequestParent(
const IPCLockRequest& aRequest) {
return MakeAndAddRef<LockRequestParent>(aRequest);
}
IPCResult LockManagerParent::RecvPLockRequestConstructor(
PLockRequestParent* aActor, const IPCLockRequest& aRequest) {
RefPtr<LockRequestParent> actor = static_cast<LockRequestParent*>(aActor);
nsTArray<RefPtr<LockRequestParent>>& queue =
mManagedLocks->mQueueMap.LookupOrInsert(aRequest.name());
if (aRequest.steal()) {
mManagedLocks->mHeldLocks.RemoveElementsBy(
[&aRequest](const RefPtr<LockRequestParent>& aHeld) {
if (aHeld->Data().name() == aRequest.name()) {
Unused << NS_WARN_IF(
!PLockRequestParent::Send__delete__(aHeld, true));
return true;
}
return false;
});
queue.InsertElementAt(0, actor);
} else if (aRequest.ifAvailable() &&
(!queue.IsEmpty() || !IsGrantableRequest(actor->Data()))) {
Unused << NS_WARN_IF(!aActor->SendResolve(aRequest.lockMode(), false));
return IPC_OK();
} else {
queue.AppendElement(actor);
}
ProcessRequestQueue(queue);
return IPC_OK();
}
} // namespace mozilla::dom::locks
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