gecko-dev/dom/workers/ServiceWorkerClients.cpp

293 lines
7.5 KiB
C++

/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* 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 "ServiceWorkerClient.h"
#include "ServiceWorkerClients.h"
#include "ServiceWorkerManager.h"
#include "WorkerPrivate.h"
#include "WorkerRunnable.h"
#include "WorkerScope.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ServiceWorkerClientsBinding.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::dom::workers;
NS_IMPL_CYCLE_COLLECTING_ADDREF(ServiceWorkerClients)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ServiceWorkerClients)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ServiceWorkerClients, mWorkerScope)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ServiceWorkerClients)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
ServiceWorkerClients::ServiceWorkerClients(ServiceWorkerGlobalScope* aWorkerScope)
: mWorkerScope(aWorkerScope)
{
MOZ_ASSERT(mWorkerScope);
}
JSObject*
ServiceWorkerClients::WrapObject(JSContext* aCx)
{
return ServiceWorkerClientsBinding::Wrap(aCx, this);
}
namespace {
// Helper class used for passing the promise between threads while
// keeping the worker alive.
class PromiseHolder MOZ_FINAL : public WorkerFeature
{
friend class GetServicedRunnable;
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PromiseHolder)
public:
PromiseHolder(WorkerPrivate* aWorkerPrivate,
Promise* aPromise)
: mWorkerPrivate(aWorkerPrivate),
mPromise(aPromise),
mCleanUpLock("promiseHolderCleanUpLock"),
mClean(false)
{
MOZ_ASSERT(mWorkerPrivate);
mWorkerPrivate->AssertIsOnWorkerThread();
MOZ_ASSERT(mPromise);
if (NS_WARN_IF(!mWorkerPrivate->AddFeature(mWorkerPrivate->GetJSContext(), this))) {
// Worker has been canceled and will go away.
// The ResolvePromiseWorkerRunnable won't run, so we can set mPromise to
// nullptr.
mPromise = nullptr;
mClean = true;
}
}
Promise*
GetPromise() const
{
return mPromise;
}
void
Clean()
{
mWorkerPrivate->AssertIsOnWorkerThread();
MutexAutoLock lock(mCleanUpLock);
if (mClean) {
return;
}
mPromise = nullptr;
mWorkerPrivate->RemoveFeature(mWorkerPrivate->GetJSContext(), this);
mClean = true;
}
bool
Notify(JSContext* aCx, Status aStatus)
{
mWorkerPrivate->AssertIsOnWorkerThread();
if (aStatus > Running) {
Clean();
}
return true;
}
private:
~PromiseHolder()
{
MOZ_ASSERT(mClean);
}
WorkerPrivate* mWorkerPrivate;
nsRefPtr<Promise> mPromise;
// Used to prevent race conditions on |mClean| and to ensure that either a
// Notify() call or a dispatch back to the worker thread occurs before
// this object is released.
Mutex mCleanUpLock;
bool mClean;
};
class ResolvePromiseWorkerRunnable MOZ_FINAL : public WorkerRunnable
{
nsRefPtr<PromiseHolder> mPromiseHolder;
nsAutoPtr<nsTArray<uint64_t>> mValue;
public:
ResolvePromiseWorkerRunnable(WorkerPrivate* aWorkerPrivate,
PromiseHolder* aPromiseHolder,
nsAutoPtr<nsTArray<uint64_t>>& aValue)
: WorkerRunnable(aWorkerPrivate, WorkerThreadModifyBusyCount),
mPromiseHolder(aPromiseHolder),
mValue(aValue)
{
AssertIsOnMainThread();
}
bool
WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
Promise* promise = mPromiseHolder->GetPromise();
MOZ_ASSERT(promise);
nsTArray<nsRefPtr<ServiceWorkerClient>> ret;
for (size_t i = 0; i < mValue->Length(); i++) {
ret.AppendElement(nsRefPtr<ServiceWorkerClient>(
new ServiceWorkerClient(promise->GetParentObject(),
mValue->ElementAt(i))));
}
promise->MaybeResolve(ret);
// release the reference on the worker thread.
mPromiseHolder->Clean();
return true;
}
};
class ReleasePromiseRunnable MOZ_FINAL : public MainThreadWorkerControlRunnable
{
nsRefPtr<PromiseHolder> mPromiseHolder;
public:
ReleasePromiseRunnable(WorkerPrivate* aWorkerPrivate,
PromiseHolder* aPromiseHolder)
: MainThreadWorkerControlRunnable(aWorkerPrivate),
mPromiseHolder(aPromiseHolder)
{ }
private:
~ReleasePromiseRunnable()
{ }
bool
WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
mPromiseHolder->Clean();
return true;
}
};
class GetServicedRunnable MOZ_FINAL : public nsRunnable
{
WorkerPrivate* mWorkerPrivate;
nsRefPtr<PromiseHolder> mPromiseHolder;
nsCString mScope;
public:
GetServicedRunnable(WorkerPrivate* aWorkerPrivate,
PromiseHolder* aPromiseHolder,
const nsCString& aScope)
: mWorkerPrivate(aWorkerPrivate),
mPromiseHolder(aPromiseHolder),
mScope(aScope)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
}
NS_IMETHOD
Run() MOZ_OVERRIDE
{
AssertIsOnMainThread();
MutexAutoLock lock(mPromiseHolder->mCleanUpLock);
if (mPromiseHolder->mClean) {
// Don't resolve the promise if it was already released.
return NS_OK;
}
nsRefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
nsAutoPtr<nsTArray<uint64_t>> result(new nsTArray<uint64_t>());
swm->GetServicedClients(mScope, result);
nsRefPtr<ResolvePromiseWorkerRunnable> r =
new ResolvePromiseWorkerRunnable(mWorkerPrivate, mPromiseHolder, result);
AutoSafeJSContext cx;
if (r->Dispatch(cx)) {
return NS_OK;
}
// Dispatch to worker thread failed because the worker is shutting down.
// Use a control runnable to release the runnable on the worker thread.
nsRefPtr<ReleasePromiseRunnable> releaseRunnable =
new ReleasePromiseRunnable(mWorkerPrivate, mPromiseHolder);
if (!releaseRunnable->Dispatch(cx)) {
NS_RUNTIMEABORT("Failed to dispatch PromiseHolder control runnable.");
}
return NS_OK;
}
};
} // anonymous namespace
already_AddRefed<Promise>
ServiceWorkerClients::GetServiced(ErrorResult& aRv)
{
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
workerPrivate->AssertIsOnWorkerThread();
DOMString scope;
mWorkerScope->GetScope(scope);
nsRefPtr<Promise> promise = Promise::Create(mWorkerScope, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
nsRefPtr<PromiseHolder> promiseHolder = new PromiseHolder(workerPrivate,
promise);
if (!promiseHolder->GetPromise()) {
// Don't dispatch if adding the worker feature failed.
return promise.forget();
}
nsRefPtr<GetServicedRunnable> r =
new GetServicedRunnable(workerPrivate,
promiseHolder,
NS_ConvertUTF16toUTF8(scope));
nsresult rv = NS_DispatchToMainThread(r);
if (NS_WARN_IF(NS_FAILED(rv))) {
promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
}
return promise.forget();
}
// FIXME(catalinb): Bug 1045257 - Implement ReloadAll
already_AddRefed<Promise>
ServiceWorkerClients::ReloadAll(ErrorResult& aRv)
{
nsRefPtr<Promise> promise = Promise::Create(mWorkerScope, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
promise->MaybeReject(NS_ERROR_NOT_AVAILABLE);
return promise.forget();
}