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gecko-dev
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gecko-dev/dom/worklet/Worklet.cpp

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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 "Worklet.h"
#include "WorkletThread.h"
#include "mozilla/dom/WorkletBinding.h"
#include "mozilla/dom/WorkletGlobalScope.h"
#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/Fetch.h"
#include "mozilla/dom/PromiseNativeHandler.h"
#include "mozilla/dom/Request.h"
#include "mozilla/dom/Response.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/ScriptLoader.h"
#include "mozilla/dom/WorkletImpl.h"
#include "js/Modules.h"
#include "js/SourceText.h"
#include "nsIInputStreamPump.h"
#include "nsIStreamLoader.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsIInputStreamPump.h"
#include "nsNetUtil.h"
#include "xpcprivate.h"
namespace mozilla {
namespace dom {
class ExecutionRunnable final : public Runnable {
public:
ExecutionRunnable(WorkletFetchHandler* aHandler, WorkletImpl* aWorkletImpl,
JS::UniqueTwoByteChars aScriptBuffer, size_t aScriptLength)
: Runnable("Worklet::ExecutionRunnable"),
mHandler(aHandler),
mWorkletImpl(aWorkletImpl),
mScriptBuffer(std::move(aScriptBuffer)),
mScriptLength(aScriptLength),
mParentRuntime(
JS_GetParentRuntime(CycleCollectedJSContext::Get()->Context())),
mResult(NS_ERROR_FAILURE) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mParentRuntime);
}
NS_IMETHOD
Run() override;
private:
void RunOnWorkletThread();
void RunOnMainThread();
bool ParseAndLinkModule(JSContext* aCx, JS::MutableHandle<JSObject*> aModule);
RefPtr<WorkletFetchHandler> mHandler;
RefPtr<WorkletImpl> mWorkletImpl;
JS::UniqueTwoByteChars mScriptBuffer;
size_t mScriptLength;
JSRuntime* mParentRuntime;
nsresult mResult;
};
// ---------------------------------------------------------------------------
// WorkletFetchHandler
class WorkletFetchHandler final : public PromiseNativeHandler,
public nsIStreamLoaderObserver {
public:
NS_DECL_THREADSAFE_ISUPPORTS
static already_AddRefed<Promise> Fetch(Worklet* aWorklet, JSContext* aCx,
const nsAString& aModuleURL,
const WorkletOptions& aOptions,
ErrorResult& aRv) {
MOZ_ASSERT(aWorklet);
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIGlobalObject> global =
do_QueryInterface(aWorklet->GetParentObject());
MOZ_ASSERT(global);
RefPtr<Promise> promise = Promise::Create(global, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
nsCOMPtr<nsPIDOMWindowInner> window = aWorklet->GetParentObject();
MOZ_ASSERT(window);
nsCOMPtr<Document> doc;
doc = window->GetExtantDoc();
if (!doc) {
promise->MaybeReject(NS_ERROR_FAILURE);
return promise.forget();
}
nsCOMPtr<nsIURI> resolvedURI;
nsresult rv = NS_NewURI(getter_AddRefs(resolvedURI), aModuleURL, nullptr,
doc->GetBaseURI());
if (NS_WARN_IF(NS_FAILED(rv))) {
promise->MaybeReject(rv);
return promise.forget();
}
nsAutoCString spec;
rv = resolvedURI->GetSpec(spec);
if (NS_WARN_IF(NS_FAILED(rv))) {
promise->MaybeReject(rv);
return promise.forget();
}
// Maybe we already have an handler for this URI
{
WorkletFetchHandler* handler = aWorklet->GetImportFetchHandler(spec);
if (handler) {
handler->AddPromise(promise);
return promise.forget();
}
}
RequestOrUSVString requestInput;
requestInput.SetAsUSVString().ShareOrDependUpon(aModuleURL);
RequestInit requestInit;
requestInit.mCredentials.Construct(aOptions.mCredentials);
RefPtr<Request> request =
Request::Constructor(global, aCx, requestInput, requestInit, aRv);
if (aRv.Failed()) {
return nullptr;
}
request->OverrideContentPolicyType(aWorklet->Impl()->ContentPolicyType());
RequestOrUSVString finalRequestInput;
finalRequestInput.SetAsRequest() = request;
RefPtr<Promise> fetchPromise = FetchRequest(
global, finalRequestInput, requestInit, CallerType::System, aRv);
if (NS_WARN_IF(aRv.Failed())) {
// OK to just return null, since caller will ignore return value
// anyway if aRv is a failure.
return nullptr;
}
RefPtr<WorkletFetchHandler> handler =
new WorkletFetchHandler(aWorklet, spec, promise);
fetchPromise->AppendNativeHandler(handler);
aWorklet->AddImportFetchHandler(spec, handler);
return promise.forget();
}
virtual void ResolvedCallback(JSContext* aCx,
JS::Handle<JS::Value> aValue) override {
MOZ_ASSERT(NS_IsMainThread());
if (!aValue.isObject()) {
RejectPromises(NS_ERROR_FAILURE);
return;
}
RefPtr<Response> response;
nsresult rv = UNWRAP_OBJECT(Response, &aValue.toObject(), response);
if (NS_WARN_IF(NS_FAILED(rv))) {
RejectPromises(NS_ERROR_FAILURE);
return;
}
if (!response->Ok()) {
RejectPromises(NS_ERROR_DOM_NETWORK_ERR);
return;
}
nsCOMPtr<nsIInputStream> inputStream;
response->GetBody(getter_AddRefs(inputStream));
if (!inputStream) {
RejectPromises(NS_ERROR_DOM_NETWORK_ERR);
return;
}
nsCOMPtr<nsIInputStreamPump> pump;
rv = NS_NewInputStreamPump(getter_AddRefs(pump), inputStream.forget());
if (NS_WARN_IF(NS_FAILED(rv))) {
RejectPromises(rv);
return;
}
nsCOMPtr<nsIStreamLoader> loader;
rv = NS_NewStreamLoader(getter_AddRefs(loader), this);
if (NS_WARN_IF(NS_FAILED(rv))) {
RejectPromises(rv);
return;
}
rv = pump->AsyncRead(loader, nullptr);
if (NS_WARN_IF(NS_FAILED(rv))) {
RejectPromises(rv);
return;
}
nsCOMPtr<nsIThreadRetargetableRequest> rr = do_QueryInterface(pump);
if (rr) {
nsCOMPtr<nsIEventTarget> sts =
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
rv = rr->RetargetDeliveryTo(sts);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch the nsIInputStreamPump to a IO thread.");
}
}
}
NS_IMETHOD
OnStreamComplete(nsIStreamLoader* aLoader, nsISupports* aContext,
nsresult aStatus, uint32_t aStringLen,
const uint8_t* aString) override {
MOZ_ASSERT(NS_IsMainThread());
if (NS_FAILED(aStatus)) {
RejectPromises(aStatus);
return NS_OK;
}
JS::UniqueTwoByteChars scriptTextBuf;
size_t scriptTextLength;
nsresult rv = ScriptLoader::ConvertToUTF16(
nullptr, aString, aStringLen, NS_LITERAL_STRING("UTF-8"), nullptr,
scriptTextBuf, scriptTextLength);
if (NS_WARN_IF(NS_FAILED(rv))) {
RejectPromises(rv);
return NS_OK;
}
// Moving the ownership of the buffer
nsCOMPtr<nsIRunnable> runnable = new ExecutionRunnable(
this, mWorklet->mImpl, std::move(scriptTextBuf), scriptTextLength);
if (NS_FAILED(mWorklet->mImpl->SendControlMessage(runnable.forget()))) {
RejectPromises(NS_ERROR_FAILURE);
return NS_OK;
}
return NS_OK;
}
virtual void RejectedCallback(JSContext* aCx,
JS::Handle<JS::Value> aValue) override {
MOZ_ASSERT(NS_IsMainThread());
RejectPromises(NS_ERROR_DOM_NETWORK_ERR);
}
const nsCString& URL() const { return mURL; }
void ExecutionFailed(nsresult aRv) {
MOZ_ASSERT(NS_IsMainThread());
RejectPromises(aRv);
}
void ExecutionSucceeded() {
MOZ_ASSERT(NS_IsMainThread());
ResolvePromises();
}
private:
WorkletFetchHandler(Worklet* aWorklet, const nsACString& aURL,
Promise* aPromise)
: mWorklet(aWorklet), mStatus(ePending), mErrorStatus(NS_OK), mURL(aURL) {
MOZ_ASSERT(aWorklet);
MOZ_ASSERT(aPromise);
MOZ_ASSERT(NS_IsMainThread());
mPromises.AppendElement(aPromise);
}
~WorkletFetchHandler() = default;
void AddPromise(Promise* aPromise) {
MOZ_ASSERT(aPromise);
MOZ_ASSERT(NS_IsMainThread());
switch (mStatus) {
case ePending:
mPromises.AppendElement(aPromise);
return;
case eRejected:
MOZ_ASSERT(NS_FAILED(mErrorStatus));
aPromise->MaybeReject(mErrorStatus);
return;
case eResolved:
aPromise->MaybeResolveWithUndefined();
return;
}
}
void RejectPromises(nsresult aResult) {
MOZ_ASSERT(mStatus == ePending);
MOZ_ASSERT(NS_FAILED(aResult));
MOZ_ASSERT(NS_IsMainThread());
for (uint32_t i = 0; i < mPromises.Length(); ++i) {
mPromises[i]->MaybeReject(aResult);
}
mPromises.Clear();
mStatus = eRejected;
mErrorStatus = aResult;
mWorklet = nullptr;
}
void ResolvePromises() {
MOZ_ASSERT(mStatus == ePending);
MOZ_ASSERT(NS_IsMainThread());
for (uint32_t i = 0; i < mPromises.Length(); ++i) {
mPromises[i]->MaybeResolveWithUndefined();
}
mPromises.Clear();
mStatus = eResolved;
mWorklet = nullptr;
}
RefPtr<Worklet> mWorklet;
nsTArray<RefPtr<Promise>> mPromises;
enum { ePending, eRejected, eResolved } mStatus;
nsresult mErrorStatus;
nsCString mURL;
};
NS_IMPL_ISUPPORTS(WorkletFetchHandler, nsIStreamLoaderObserver)
NS_IMETHODIMP
ExecutionRunnable::Run() {
// WorkletThread::IsOnWorkletThread() cannot be used here because it depends
// on a WorkletJSContext having been created for this thread. That does not
// happen until the global scope is created the first time
// RunOnWorkletThread() is called.
if (!NS_IsMainThread()) {
RunOnWorkletThread();
return NS_DispatchToMainThread(this);
}
RunOnMainThread();
return NS_OK;
}
bool ExecutionRunnable::ParseAndLinkModule(
JSContext* aCx, JS::MutableHandle<JSObject*> aModule) {
JS::CompileOptions compileOptions(aCx);
compileOptions.setIntroductionType("Worklet");
compileOptions.setFileAndLine(mHandler->URL().get(), 1);
compileOptions.setIsRunOnce(true);
compileOptions.setNoScriptRval(true);
JS::SourceText<char16_t> buffer;
if (!buffer.init(aCx, std::move(mScriptBuffer), mScriptLength)) {
return false;
}
JS::Rooted<JSObject*> module(aCx,
JS::CompileModule(aCx, compileOptions, buffer));
if (!module) {
return false;
}
// Link() was previously named Instantiate().
// https://github.com/tc39/ecma262/pull/1312
// Any imports will fail here - bug 1572644.
if (!JS::ModuleInstantiate(aCx, module)) {
return false;
}
aModule.set(module);
return true;
}
void ExecutionRunnable::RunOnWorkletThread() {
WorkletThread* workletThread =
static_cast<WorkletThread*>(NS_GetCurrentThread());
workletThread->EnsureCycleCollectedJSContext(mParentRuntime);
WorkletGlobalScope* globalScope = mWorkletImpl->GetGlobalScope();
if (!globalScope) {
mResult = NS_ERROR_DOM_UNKNOWN_ERR;
return;
}
AutoEntryScript aes(globalScope, "Worklet");
JSContext* cx = aes.cx();
JS::Rooted<JSObject*> module(cx);
if (!ParseAndLinkModule(cx, &module)) {
mResult = NS_ERROR_DOM_ABORT_ERR;
return;
}
// https://drafts.css-houdini.org/worklets/#fetch-and-invoke-a-worklet-script
// invokes
// https://html.spec.whatwg.org/multipage/webappapis.html#run-a-module-script
// without /rethrow errors/ and so unhandled exceptions do not cause the
// promise to be rejected.
JS::ModuleEvaluate(cx, module);
// All done.
mResult = NS_OK;
}
void ExecutionRunnable::RunOnMainThread() {
MOZ_ASSERT(NS_IsMainThread());
if (NS_FAILED(mResult)) {
mHandler->ExecutionFailed(mResult);
return;
}
mHandler->ExecutionSucceeded();
}
// ---------------------------------------------------------------------------
// Worklet
NS_IMPL_CYCLE_COLLECTION_CLASS(Worklet)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Worklet)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mWindow)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwnedObject)
tmp->mImpl->NotifyWorkletFinished();
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Worklet)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwnedObject)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(Worklet)
NS_IMPL_CYCLE_COLLECTING_ADDREF(Worklet)
NS_IMPL_CYCLE_COLLECTING_RELEASE(Worklet)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Worklet)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
Worklet::Worklet(nsPIDOMWindowInner* aWindow, RefPtr<WorkletImpl> aImpl,
nsISupports* aOwnedObject)
: mWindow(aWindow), mOwnedObject(aOwnedObject), mImpl(std::move(aImpl)) {
MOZ_ASSERT(aWindow);
MOZ_ASSERT(mImpl);
MOZ_ASSERT(NS_IsMainThread());
}
Worklet::~Worklet() { mImpl->NotifyWorkletFinished(); }
JSObject* Worklet::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return mImpl->WrapWorklet(aCx, this, aGivenProto);
}
already_AddRefed<Promise> Worklet::AddModule(JSContext* aCx,
const nsAString& aModuleURL,
const WorkletOptions& aOptions,
CallerType aCallerType,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
return WorkletFetchHandler::Fetch(this, aCx, aModuleURL, aOptions, aRv);
}
WorkletFetchHandler* Worklet::GetImportFetchHandler(const nsACString& aURI) {
MOZ_ASSERT(NS_IsMainThread());
return mImportHandlers.GetWeak(aURI);
}
void Worklet::AddImportFetchHandler(const nsACString& aURI,
WorkletFetchHandler* aHandler) {
MOZ_ASSERT(aHandler);
MOZ_ASSERT(!mImportHandlers.GetWeak(aURI));
MOZ_ASSERT(NS_IsMainThread());
mImportHandlers.Put(aURI, RefPtr{aHandler});
}
} // namespace dom
} // namespace mozilla
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