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gecko-dev/dom/xhr/XMLHttpRequestWorker.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 "XMLHttpRequestWorker.h"
#include "nsIDOMEventListener.h"
#include "nsIRunnable.h"
#include "nsIXPConnect.h"
#include "jsapi.h" // JS::AutoValueArray
#include "jsfriendapi.h"
#include "js/ArrayBuffer.h" // JS::Is{,Detached}ArrayBufferObject
#include "js/GCPolicyAPI.h"
#include "js/RootingAPI.h" // JS::{Handle,Heap},PersistentRooted
#include "js/TracingAPI.h"
#include "js/Value.h" // JS::{Undefined,}Value
#include "mozilla/ArrayUtils.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/ProgressEvent.h"
#include "mozilla/dom/StructuredCloneHolder.h"
#include "mozilla/dom/UnionConversions.h"
#include "mozilla/dom/URLSearchParams.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/dom/XMLHttpRequestBinding.h"
#include "mozilla/Telemetry.h"
#include "nsComponentManagerUtils.h"
#include "nsContentUtils.h"
#include "nsJSUtils.h"
#include "nsThreadUtils.h"
#include "XMLHttpRequestUpload.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
namespace dom {
/* static */
void XMLHttpRequestWorker::StateData::trace(JSTracer* aTrc) {
JS::TraceEdge(aTrc, &mResponse, "XMLHttpRequestWorker::StateData::mResponse");
}
/**
* XMLHttpRequest in workers
*
* XHR in workers is implemented by proxying calls/events/etc between the
* worker thread and an XMLHttpRequest on the main thread. The glue
* object here is the Proxy, which lives on both threads. All other objects
* live on either the main thread (the XMLHttpRequest) or the worker thread
* (the worker and XHR private objects).
*
* The main thread XHR is always operated in async mode, even for sync XHR
* in workers. Calls made on the worker thread are proxied to the main thread
* synchronously (meaning the worker thread is blocked until the call
* returns). Each proxied call spins up a sync queue, which captures any
* synchronously dispatched events and ensures that they run synchronously
* on the worker as well. Asynchronously dispatched events are posted to the
* worker thread to run asynchronously. Some of the XHR state is mirrored on
* the worker thread to avoid needing a cross-thread call on every property
* access.
*
* The XHR private is stored in the private slot of the XHR JSObject on the
* worker thread. It is destroyed when that JSObject is GCd. The private
* roots its JSObject while network activity is in progress. It also
* adds itself as a feature to the worker to give itself a chance to clean up
* if the worker goes away during an XHR call. It is important that the
* rooting and feature registration (collectively called pinning) happens at
* the proper times. If we pin for too long we can cause memory leaks or even
* shutdown hangs. If we don't pin for long enough we introduce a GC hazard.
*
* The XHR is pinned from the time Send is called to roughly the time loadend
* is received. There are some complications involved with Abort and XHR
* reuse. We maintain a counter on the main thread of how many times Send was
* called on this XHR, and we decrement the counter every time we receive a
* loadend event. When the counter reaches zero we dispatch a runnable to the
* worker thread to unpin the XHR. We only decrement the counter if the
* dispatch was successful, because the worker may no longer be accepting
* regular runnables. In the event that we reach Proxy::Teardown and there
* the outstanding Send count is still non-zero, we dispatch a control
* runnable which is guaranteed to run.
*
* NB: Some of this could probably be simplified now that we have the
* inner/outer channel ids.
*/
class Proxy final : public nsIDOMEventListener {
public:
// Read on multiple threads.
WorkerPrivate* mWorkerPrivate;
XMLHttpRequestWorker* mXMLHttpRequestPrivate;
const ClientInfo mClientInfo;
const Maybe<ServiceWorkerDescriptor> mController;
// XHR Params:
bool mMozAnon;
bool mMozSystem;
// Only touched on the main thread.
RefPtr<XMLHttpRequestMainThread> mXHR;
RefPtr<XMLHttpRequestUpload> mXHRUpload;
nsCOMPtr<nsIEventTarget> mSyncLoopTarget;
nsCOMPtr<nsIEventTarget> mSyncEventResponseTarget;
uint32_t mInnerEventStreamId;
uint32_t mInnerChannelId;
uint32_t mOutstandingSendCount;
// Only touched on the worker thread.
uint32_t mOuterEventStreamId;
uint32_t mOuterChannelId;
uint32_t mOpenCount;
uint64_t mLastLoaded;
uint64_t mLastTotal;
uint64_t mLastUploadLoaded;
uint64_t mLastUploadTotal;
bool mIsSyncXHR;
bool mLastLengthComputable;
bool mLastUploadLengthComputable;
bool mSeenLoadStart;
bool mSeenUploadLoadStart;
// Only touched on the main thread.
bool mUploadEventListenersAttached;
bool mMainThreadSeenLoadStart;
bool mInOpen;
bool mArrayBufferResponseWasTransferred;
public:
Proxy(XMLHttpRequestWorker* aXHRPrivate, const ClientInfo& aClientInfo,
const Maybe<ServiceWorkerDescriptor>& aController, bool aMozAnon,
bool aMozSystem)
: mWorkerPrivate(nullptr),
mXMLHttpRequestPrivate(aXHRPrivate),
mClientInfo(aClientInfo),
mController(aController),
mMozAnon(aMozAnon),
mMozSystem(aMozSystem),
mInnerEventStreamId(0),
mInnerChannelId(0),
mOutstandingSendCount(0),
mOuterEventStreamId(0),
mOuterChannelId(0),
mOpenCount(0),
mLastLoaded(0),
mLastTotal(0),
mLastUploadLoaded(0),
mLastUploadTotal(0),
mIsSyncXHR(false),
mLastLengthComputable(false),
mLastUploadLengthComputable(false),
mSeenLoadStart(false),
mSeenUploadLoadStart(false),
mUploadEventListenersAttached(false),
mMainThreadSeenLoadStart(false),
mInOpen(false),
mArrayBufferResponseWasTransferred(false) {}
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIDOMEVENTLISTENER
bool Init();
void Teardown(bool aSendUnpin);
bool AddRemoveEventListeners(bool aUpload, bool aAdd);
void Reset() {
AssertIsOnMainThread();
if (mUploadEventListenersAttached) {
AddRemoveEventListeners(true, false);
}
}
already_AddRefed<nsIEventTarget> GetEventTarget() {
AssertIsOnMainThread();
nsCOMPtr<nsIEventTarget> target =
mSyncEventResponseTarget ? mSyncEventResponseTarget : mSyncLoopTarget;
return target.forget();
}
private:
~Proxy() {
MOZ_ASSERT(!mXHR);
MOZ_ASSERT(!mXHRUpload);
MOZ_ASSERT(!mOutstandingSendCount);
}
};
class WorkerThreadProxySyncRunnable : public WorkerMainThreadRunnable {
protected:
RefPtr<Proxy> mProxy;
private:
// mErrorCode is set on the main thread by MainThreadRun and it's used to at
// the end of the Dispatch() to return the error code.
nsresult mErrorCode;
public:
WorkerThreadProxySyncRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy)
: WorkerMainThreadRunnable(aWorkerPrivate, NS_LITERAL_CSTRING("XHR")),
mProxy(aProxy),
mErrorCode(NS_OK) {
MOZ_ASSERT(aWorkerPrivate);
MOZ_ASSERT(aProxy);
aWorkerPrivate->AssertIsOnWorkerThread();
}
void Dispatch(WorkerStatus aFailStatus, ErrorResult& aRv) {
WorkerMainThreadRunnable::Dispatch(aFailStatus, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
if (NS_FAILED(mErrorCode)) {
aRv.Throw(mErrorCode);
}
}
protected:
virtual ~WorkerThreadProxySyncRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) = 0;
private:
virtual bool MainThreadRun() override;
};
class SendRunnable final : public WorkerThreadProxySyncRunnable,
public StructuredCloneHolder {
nsString mStringBody;
nsCOMPtr<nsIEventTarget> mSyncLoopTarget;
bool mHasUploadListeners;
public:
SendRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
const nsAString& aStringBody)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
StructuredCloneHolder(CloningSupported, TransferringNotSupported,
StructuredCloneScope::SameProcessDifferentThread),
mStringBody(aStringBody),
mHasUploadListeners(false) {}
void SetHaveUploadListeners(bool aHasUploadListeners) {
mHasUploadListeners = aHasUploadListeners;
}
void SetSyncLoopTarget(nsIEventTarget* aSyncLoopTarget) {
mSyncLoopTarget = aSyncLoopTarget;
}
private:
~SendRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override;
};
namespace {
enum {
STRING_abort = 0,
STRING_error,
STRING_load,
STRING_loadstart,
STRING_progress,
STRING_timeout,
STRING_readystatechange,
STRING_loadend,
STRING_COUNT,
STRING_LAST_XHR = STRING_loadend,
STRING_LAST_EVENTTARGET = STRING_timeout
};
static_assert(STRING_LAST_XHR >= STRING_LAST_EVENTTARGET, "Bad string setup!");
static_assert(STRING_LAST_XHR == STRING_COUNT - 1, "Bad string setup!");
const char* const sEventStrings[] = {
// XMLHttpRequestEventTarget event types, supported by both XHR and Upload.
"abort",
"error",
"load",
"loadstart",
"progress",
"timeout",
// XMLHttpRequest event types, supported only by XHR.
"readystatechange",
"loadend",
};
static_assert(MOZ_ARRAY_LENGTH(sEventStrings) == STRING_COUNT,
"Bad string count!");
class MainThreadProxyRunnable : public MainThreadWorkerSyncRunnable {
protected:
RefPtr<Proxy> mProxy;
MainThreadProxyRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy)
: MainThreadWorkerSyncRunnable(aWorkerPrivate, aProxy->GetEventTarget()),
mProxy(aProxy) {
MOZ_ASSERT(aProxy);
}
virtual ~MainThreadProxyRunnable() {}
};
class XHRUnpinRunnable final : public MainThreadWorkerControlRunnable {
XMLHttpRequestWorker* mXMLHttpRequestPrivate;
public:
XHRUnpinRunnable(WorkerPrivate* aWorkerPrivate,
XMLHttpRequestWorker* aXHRPrivate)
: MainThreadWorkerControlRunnable(aWorkerPrivate),
mXMLHttpRequestPrivate(aXHRPrivate) {
MOZ_ASSERT(aXHRPrivate);
}
private:
~XHRUnpinRunnable() {}
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
if (mXMLHttpRequestPrivate->SendInProgress()) {
mXMLHttpRequestPrivate->Unpin();
}
return true;
}
};
class AsyncTeardownRunnable final : public Runnable {
RefPtr<Proxy> mProxy;
public:
explicit AsyncTeardownRunnable(Proxy* aProxy)
: Runnable("dom::AsyncTeardownRunnable"), mProxy(aProxy) {
MOZ_ASSERT(aProxy);
}
private:
~AsyncTeardownRunnable() {}
NS_IMETHOD
Run() override {
AssertIsOnMainThread();
// This means the XHR was GC'd, so we can't be pinned, and we don't need to
// try to unpin.
mProxy->Teardown(/* aSendUnpin */ false);
mProxy = nullptr;
return NS_OK;
}
};
class LoadStartDetectionRunnable final : public Runnable,
public nsIDOMEventListener {
WorkerPrivate* mWorkerPrivate;
RefPtr<Proxy> mProxy;
RefPtr<XMLHttpRequest> mXHR;
XMLHttpRequestWorker* mXMLHttpRequestPrivate;
nsString mEventType;
uint32_t mChannelId;
bool mReceivedLoadStart;
class ProxyCompleteRunnable final : public MainThreadProxyRunnable {
XMLHttpRequestWorker* mXMLHttpRequestPrivate;
uint32_t mChannelId;
public:
ProxyCompleteRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
XMLHttpRequestWorker* aXHRPrivate,
uint32_t aChannelId)
: MainThreadProxyRunnable(aWorkerPrivate, aProxy),
mXMLHttpRequestPrivate(aXHRPrivate),
mChannelId(aChannelId) {}
private:
~ProxyCompleteRunnable() {}
virtual bool WorkerRun(JSContext* aCx,
WorkerPrivate* aWorkerPrivate) override {
if (mChannelId != mProxy->mOuterChannelId) {
// Threads raced, this event is now obsolete.
return true;
}
if (mSyncLoopTarget) {
aWorkerPrivate->StopSyncLoop(mSyncLoopTarget, true);
}
if (mXMLHttpRequestPrivate->SendInProgress()) {
mXMLHttpRequestPrivate->Unpin();
}
return true;
}
nsresult Cancel() override {
// This must run!
nsresult rv = MainThreadProxyRunnable::Cancel();
nsresult rv2 = Run();
return NS_FAILED(rv) ? rv : rv2;
}
};
public:
LoadStartDetectionRunnable(Proxy* aProxy, XMLHttpRequestWorker* aXHRPrivate)
: Runnable("dom::LoadStartDetectionRunnable"),
mWorkerPrivate(aProxy->mWorkerPrivate),
mProxy(aProxy),
mXHR(aProxy->mXHR),
mXMLHttpRequestPrivate(aXHRPrivate),
mChannelId(mProxy->mInnerChannelId),
mReceivedLoadStart(false) {
AssertIsOnMainThread();
mEventType.AssignASCII(sEventStrings[STRING_loadstart]);
}
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIRUNNABLE
NS_DECL_NSIDOMEVENTLISTENER
bool RegisterAndDispatch() {
AssertIsOnMainThread();
if (NS_FAILED(mXHR->AddEventListener(mEventType, this, false, false))) {
NS_WARNING("Failed to add event listener!");
return false;
}
return NS_SUCCEEDED(mWorkerPrivate->DispatchToMainThread(this));
}
private:
~LoadStartDetectionRunnable() { AssertIsOnMainThread(); }
};
class EventRunnable final : public MainThreadProxyRunnable,
public StructuredCloneHolder {
nsString mType;
nsString mResponseType;
JS::Heap<JS::Value> mResponse;
XMLHttpRequestStringSnapshot mResponseText;
nsString mResponseURL;
nsCString mStatusText;
uint64_t mLoaded;
uint64_t mTotal;
uint32_t mEventStreamId;
uint32_t mStatus;
uint16_t mReadyState;
bool mUploadEvent;
bool mProgressEvent;
bool mLengthComputable;
bool mUseCachedArrayBufferResponse;
nsresult mResponseTextResult;
nsresult mStatusResult;
nsresult mResponseResult;
// mScopeObj is used in PreDispatch only. We init it in our constructor, and
// reset() in PreDispatch, to ensure that it's not still linked into the
// runtime once we go off-thread.
JS::PersistentRooted<JSObject*> mScopeObj;
public:
EventRunnable(Proxy* aProxy, bool aUploadEvent, const nsString& aType,
bool aLengthComputable, uint64_t aLoaded, uint64_t aTotal,
JS::Handle<JSObject*> aScopeObj)
: MainThreadProxyRunnable(aProxy->mWorkerPrivate, aProxy),
StructuredCloneHolder(CloningSupported, TransferringNotSupported,
StructuredCloneScope::SameProcessDifferentThread),
mType(aType),
mResponse(JS::UndefinedValue()),
mLoaded(aLoaded),
mTotal(aTotal),
mEventStreamId(aProxy->mInnerEventStreamId),
mStatus(0),
mReadyState(0),
mUploadEvent(aUploadEvent),
mProgressEvent(true),
mLengthComputable(aLengthComputable),
mUseCachedArrayBufferResponse(false),
mResponseTextResult(NS_OK),
mStatusResult(NS_OK),
mResponseResult(NS_OK),
mScopeObj(RootingCx(), aScopeObj) {}
EventRunnable(Proxy* aProxy, bool aUploadEvent, const nsString& aType,
JS::Handle<JSObject*> aScopeObj)
: MainThreadProxyRunnable(aProxy->mWorkerPrivate, aProxy),
StructuredCloneHolder(CloningSupported, TransferringNotSupported,
StructuredCloneScope::SameProcessDifferentThread),
mType(aType),
mResponse(JS::UndefinedValue()),
mLoaded(0),
mTotal(0),
mEventStreamId(aProxy->mInnerEventStreamId),
mStatus(0),
mReadyState(0),
mUploadEvent(aUploadEvent),
mProgressEvent(false),
mLengthComputable(0),
mUseCachedArrayBufferResponse(false),
mResponseTextResult(NS_OK),
mStatusResult(NS_OK),
mResponseResult(NS_OK),
mScopeObj(RootingCx(), aScopeObj) {}
private:
~EventRunnable() {}
bool PreDispatch(WorkerPrivate* /* unused */) final;
bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override;
};
class SyncTeardownRunnable final : public WorkerThreadProxySyncRunnable {
public:
SyncTeardownRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy) {}
private:
~SyncTeardownRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->Teardown(/* aSendUnpin */ true);
MOZ_ASSERT(!mProxy->mSyncLoopTarget);
}
};
class SetBackgroundRequestRunnable final
: public WorkerThreadProxySyncRunnable {
bool mValue;
public:
SetBackgroundRequestRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
bool aValue)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy), mValue(aValue) {}
private:
~SetBackgroundRequestRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->SetMozBackgroundRequest(mValue, aRv);
}
};
class SetWithCredentialsRunnable final : public WorkerThreadProxySyncRunnable {
bool mValue;
public:
SetWithCredentialsRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
bool aValue)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy), mValue(aValue) {}
private:
~SetWithCredentialsRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->SetWithCredentials(mValue, aRv);
}
};
class SetResponseTypeRunnable final : public WorkerThreadProxySyncRunnable {
XMLHttpRequestResponseType mResponseType;
public:
SetResponseTypeRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
XMLHttpRequestResponseType aResponseType)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mResponseType(aResponseType) {}
XMLHttpRequestResponseType ResponseType() { return mResponseType; }
private:
~SetResponseTypeRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->SetResponseTypeRaw(mResponseType);
mResponseType = mProxy->mXHR->ResponseType();
}
};
class SetTimeoutRunnable final : public WorkerThreadProxySyncRunnable {
uint32_t mTimeout;
public:
SetTimeoutRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
uint32_t aTimeout)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mTimeout(aTimeout) {}
private:
~SetTimeoutRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->SetTimeout(mTimeout, aRv);
}
};
class AbortRunnable final : public WorkerThreadProxySyncRunnable {
public:
AbortRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy) {}
private:
~AbortRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override;
};
class GetAllResponseHeadersRunnable final
: public WorkerThreadProxySyncRunnable {
nsCString& mResponseHeaders;
public:
GetAllResponseHeadersRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
nsCString& aResponseHeaders)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mResponseHeaders(aResponseHeaders) {}
private:
~GetAllResponseHeadersRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->GetAllResponseHeaders(mResponseHeaders, aRv);
}
};
class GetResponseHeaderRunnable final : public WorkerThreadProxySyncRunnable {
const nsCString mHeader;
nsCString& mValue;
public:
GetResponseHeaderRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
const nsACString& aHeader, nsCString& aValue)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mHeader(aHeader),
mValue(aValue) {}
private:
~GetResponseHeaderRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->GetResponseHeader(mHeader, mValue, aRv);
}
};
class OpenRunnable final : public WorkerThreadProxySyncRunnable {
nsCString mMethod;
nsString mURL;
Optional<nsAString> mUser;
nsString mUserStr;
Optional<nsAString> mPassword;
nsString mPasswordStr;
bool mBackgroundRequest;
bool mWithCredentials;
uint32_t mTimeout;
XMLHttpRequestResponseType mResponseType;
const nsString mMimeTypeOverride;
// Remember the worker thread's stack when the XHR was opened, so that it can
// be passed on to the net monitor.
UniquePtr<SerializedStackHolder> mOriginStack;
// Remember the worker thread's stack when the XHR was opened for profiling
// purposes.
UniqueProfilerBacktrace mSource;
public:
OpenRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
const nsACString& aMethod, const nsAString& aURL,
const Optional<nsAString>& aUser,
const Optional<nsAString>& aPassword, bool aBackgroundRequest,
bool aWithCredentials, uint32_t aTimeout,
XMLHttpRequestResponseType aResponseType,
const nsString& aMimeTypeOverride,
UniquePtr<SerializedStackHolder> aOriginStack,
UniqueProfilerBacktrace aSource = nullptr)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mMethod(aMethod),
mURL(aURL),
mBackgroundRequest(aBackgroundRequest),
mWithCredentials(aWithCredentials),
mTimeout(aTimeout),
mResponseType(aResponseType),
mMimeTypeOverride(aMimeTypeOverride),
mOriginStack(std::move(aOriginStack)),
mSource(std::move(aSource)) {
if (aUser.WasPassed()) {
mUserStr = aUser.Value();
mUser = &mUserStr;
}
if (aPassword.WasPassed()) {
mPasswordStr = aPassword.Value();
mPassword = &mPasswordStr;
}
}
private:
~OpenRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
WorkerPrivate* oldWorker = mProxy->mWorkerPrivate;
mProxy->mWorkerPrivate = mWorkerPrivate;
aRv = MainThreadRunInternal();
mProxy->mWorkerPrivate = oldWorker;
}
nsresult MainThreadRunInternal();
};
class SetRequestHeaderRunnable final : public WorkerThreadProxySyncRunnable {
nsCString mHeader;
nsCString mValue;
public:
SetRequestHeaderRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
const nsACString& aHeader, const nsACString& aValue)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mHeader(aHeader),
mValue(aValue) {}
private:
~SetRequestHeaderRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->SetRequestHeader(mHeader, mValue, aRv);
}
};
class OverrideMimeTypeRunnable final : public WorkerThreadProxySyncRunnable {
nsString mMimeType;
public:
OverrideMimeTypeRunnable(WorkerPrivate* aWorkerPrivate, Proxy* aProxy,
const nsAString& aMimeType)
: WorkerThreadProxySyncRunnable(aWorkerPrivate, aProxy),
mMimeType(aMimeType) {}
private:
~OverrideMimeTypeRunnable() {}
virtual void RunOnMainThread(ErrorResult& aRv) override {
mProxy->mXHR->OverrideMimeType(mMimeType, aRv);
}
};
class AutoUnpinXHR {
XMLHttpRequestWorker* mXMLHttpRequestPrivate;
public:
explicit AutoUnpinXHR(XMLHttpRequestWorker* aXMLHttpRequestPrivate)
: mXMLHttpRequestPrivate(aXMLHttpRequestPrivate) {
MOZ_ASSERT(aXMLHttpRequestPrivate);
}
~AutoUnpinXHR() {
if (mXMLHttpRequestPrivate) {
mXMLHttpRequestPrivate->Unpin();
}
}
void Clear() { mXMLHttpRequestPrivate = nullptr; }
};
} // namespace
bool Proxy::Init() {
AssertIsOnMainThread();
MOZ_ASSERT(mWorkerPrivate);
if (mXHR) {
return true;
}
nsPIDOMWindowInner* ownerWindow = mWorkerPrivate->GetWindow();
if (ownerWindow && !ownerWindow->IsCurrentInnerWindow()) {
NS_WARNING("Window has navigated, cannot create XHR here.");
return false;
}
mXHR = new XMLHttpRequestMainThread();
mXHR->Construct(mWorkerPrivate->GetPrincipal(),
ownerWindow ? ownerWindow->AsGlobal() : nullptr,
mWorkerPrivate->CookieSettings(), true,
mWorkerPrivate->GetBaseURI(), mWorkerPrivate->GetLoadGroup(),
mWorkerPrivate->GetPerformanceStorage(),
mWorkerPrivate->CSPEventListener());
mXHR->SetParameters(mMozAnon, mMozSystem);
mXHR->SetClientInfoAndController(mClientInfo, mController);
ErrorResult rv;
mXHRUpload = mXHR->GetUpload(rv);
if (NS_WARN_IF(rv.Failed())) {
mXHR = nullptr;
return false;
}
if (!AddRemoveEventListeners(false, true)) {
mXHR = nullptr;
mXHRUpload = nullptr;
return false;
}
return true;
}
void Proxy::Teardown(bool aSendUnpin) {
AssertIsOnMainThread();
if (mXHR) {
Reset();
// NB: We are intentionally dropping events coming from xhr.abort on the
// floor.
AddRemoveEventListeners(false, false);
ErrorResult rv;
mXHR->Abort(rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
}
if (mOutstandingSendCount) {
if (aSendUnpin) {
RefPtr<XHRUnpinRunnable> runnable =
new XHRUnpinRunnable(mWorkerPrivate, mXMLHttpRequestPrivate);
if (!runnable->Dispatch()) {
MOZ_CRASH("We're going to hang at shutdown anyways.");
}
}
if (mSyncLoopTarget) {
// We have an unclosed sync loop. Fix that now.
RefPtr<MainThreadStopSyncLoopRunnable> runnable =
new MainThreadStopSyncLoopRunnable(mWorkerPrivate,
mSyncLoopTarget.forget(), false);
if (!runnable->Dispatch()) {
MOZ_CRASH("We're going to hang at shutdown anyways.");
}
}
mOutstandingSendCount = 0;
}
mWorkerPrivate = nullptr;
mXHRUpload = nullptr;
mXHR = nullptr;
}
MOZ_ASSERT(!mWorkerPrivate);
MOZ_ASSERT(!mSyncLoopTarget);
}
bool Proxy::AddRemoveEventListeners(bool aUpload, bool aAdd) {
AssertIsOnMainThread();
NS_ASSERTION(!aUpload || (mUploadEventListenersAttached && !aAdd) ||
(!mUploadEventListenersAttached && aAdd),
"Messed up logic for upload listeners!");
RefPtr<DOMEventTargetHelper> targetHelper =
aUpload ? static_cast<XMLHttpRequestUpload*>(mXHRUpload.get())
: static_cast<XMLHttpRequestEventTarget*>(mXHR.get());
MOZ_ASSERT(targetHelper, "This should never fail!");
uint32_t lastEventType = aUpload ? STRING_LAST_EVENTTARGET : STRING_LAST_XHR;
nsAutoString eventType;
for (uint32_t index = 0; index <= lastEventType; index++) {
eventType = NS_ConvertASCIItoUTF16(sEventStrings[index]);
if (aAdd) {
if (NS_FAILED(targetHelper->AddEventListener(eventType, this, false))) {
return false;
}
} else {
targetHelper->RemoveEventListener(eventType, this, false);
}
}
if (aUpload) {
mUploadEventListenersAttached = aAdd;
}
return true;
}
NS_IMPL_ISUPPORTS(Proxy, nsIDOMEventListener)
NS_IMETHODIMP
Proxy::HandleEvent(Event* aEvent) {
AssertIsOnMainThread();
if (!mWorkerPrivate || !mXMLHttpRequestPrivate) {
NS_ERROR("Shouldn't get here!");
return NS_OK;
}
nsAutoString type;
aEvent->GetType(type);
bool isUploadTarget = mXHR != aEvent->GetTarget();
ProgressEvent* progressEvent = aEvent->AsProgressEvent();
if (mInOpen && type.EqualsASCII(sEventStrings[STRING_readystatechange])) {
if (mXHR->ReadyState() == 1) {
mInnerEventStreamId++;
}
}
{
AutoSafeJSContext cx;
JS::Rooted<JS::Value> value(cx);
if (!GetOrCreateDOMReflectorNoWrap(cx, mXHR, &value)) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSObject*> scope(cx, &value.toObject());
RefPtr<EventRunnable> runnable;
if (progressEvent) {
if (!mIsSyncXHR || !type.EqualsASCII(sEventStrings[STRING_progress])) {
runnable = new EventRunnable(
this, isUploadTarget, type, progressEvent->LengthComputable(),
progressEvent->Loaded(), progressEvent->Total(), scope);
}
} else {
runnable = new EventRunnable(this, isUploadTarget, type, scope);
}
if (runnable) {
runnable->Dispatch();
}
}
if (!isUploadTarget) {
if (type.EqualsASCII(sEventStrings[STRING_loadstart])) {
mMainThreadSeenLoadStart = true;
} else if (mMainThreadSeenLoadStart &&
type.EqualsASCII(sEventStrings[STRING_loadend])) {
mMainThreadSeenLoadStart = false;
RefPtr<LoadStartDetectionRunnable> runnable =
new LoadStartDetectionRunnable(this, mXMLHttpRequestPrivate);
if (!runnable->RegisterAndDispatch()) {
NS_WARNING("Failed to dispatch LoadStartDetectionRunnable!");
}
}
}
return NS_OK;
}
NS_IMPL_ISUPPORTS_INHERITED(LoadStartDetectionRunnable, Runnable,
nsIDOMEventListener)
NS_IMETHODIMP
LoadStartDetectionRunnable::Run() {
AssertIsOnMainThread();
mXHR->RemoveEventListener(mEventType, this, false);
if (!mReceivedLoadStart) {
if (mProxy->mOutstandingSendCount > 1) {
mProxy->mOutstandingSendCount--;
} else if (mProxy->mOutstandingSendCount == 1) {
mProxy->Reset();
RefPtr<ProxyCompleteRunnable> runnable = new ProxyCompleteRunnable(
mWorkerPrivate, mProxy, mXMLHttpRequestPrivate, mChannelId);
if (runnable->Dispatch()) {
mProxy->mWorkerPrivate = nullptr;
mProxy->mSyncLoopTarget = nullptr;
mProxy->mOutstandingSendCount--;
}
}
}
mProxy = nullptr;
mXHR = nullptr;
mXMLHttpRequestPrivate = nullptr;
return NS_OK;
}
NS_IMETHODIMP
LoadStartDetectionRunnable::HandleEvent(Event* aEvent) {
AssertIsOnMainThread();
#ifdef DEBUG
{
nsAutoString type;
aEvent->GetType(type);
MOZ_ASSERT(type == mEventType);
}
#endif
mReceivedLoadStart = true;
return NS_OK;
}
bool EventRunnable::PreDispatch(WorkerPrivate* /* unused */) {
AssertIsOnMainThread();
AutoJSAPI jsapi;
DebugOnly<bool> ok = jsapi.Init(xpc::NativeGlobal(mScopeObj));
MOZ_ASSERT(ok);
JSContext* cx = jsapi.cx();
// Now keep the mScopeObj alive for the duration
JS::Rooted<JSObject*> scopeObj(cx, mScopeObj);
// And reset mScopeObj now, before we have a chance to run its destructor on
// some background thread.
mScopeObj.reset();
RefPtr<XMLHttpRequestMainThread>& xhr = mProxy->mXHR;
MOZ_ASSERT(xhr);
const EnumEntry& entry =
XMLHttpRequestResponseTypeValues::strings[static_cast<uint32_t>(
xhr->ResponseType())];
mResponseType.AssignASCII(entry.value, entry.length);
ErrorResult rv;
xhr->GetResponseText(mResponseText, rv);
mResponseTextResult = rv.StealNSResult();
if (NS_SUCCEEDED(mResponseTextResult)) {
mResponseResult = mResponseTextResult;
if (mResponseText.IsVoid()) {
mResponse.setNull();
}
} else {
JS::Rooted<JS::Value> response(cx);
xhr->GetResponse(cx, &response, rv);
mResponseResult = rv.StealNSResult();
if (NS_SUCCEEDED(mResponseResult)) {
if (!response.isGCThing()) {
mResponse = response;
} else {
bool doClone = true;
JS::Rooted<JS::Value> transferable(cx);
JS::Rooted<JSObject*> obj(
cx, response.isObject() ? &response.toObject() : nullptr);
if (obj && JS::IsArrayBufferObject(obj)) {
// Use cached response if the arraybuffer has been transfered.
if (mProxy->mArrayBufferResponseWasTransferred) {
MOZ_ASSERT(JS::IsDetachedArrayBufferObject(obj));
mUseCachedArrayBufferResponse = true;
doClone = false;
} else {
MOZ_ASSERT(!JS::IsDetachedArrayBufferObject(obj));
JS::AutoValueArray<1> argv(cx);
argv[0].set(response);
obj = JS_NewArrayObject(cx, argv);
if (obj) {
transferable.setObject(*obj);
// Only cache the response when the readyState is DONE.
if (xhr->ReadyState() == 4) {
mProxy->mArrayBufferResponseWasTransferred = true;
}
} else {
mResponseResult = NS_ERROR_OUT_OF_MEMORY;
doClone = false;
}
}
}
if (doClone) {
Write(cx, response, transferable, JS::CloneDataPolicy(), rv);
if (NS_WARN_IF(rv.Failed())) {
NS_WARNING("Failed to clone response!");
mResponseResult = rv.StealNSResult();
mProxy->mArrayBufferResponseWasTransferred = false;
}
}
}
}
}
mStatus = xhr->GetStatus(rv);
mStatusResult = rv.StealNSResult();
xhr->GetStatusText(mStatusText, rv);
MOZ_ASSERT(!rv.Failed());
mReadyState = xhr->ReadyState();
xhr->GetResponseURL(mResponseURL);
return true;
}
bool EventRunnable::WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) {
if (mEventStreamId != mProxy->mOuterEventStreamId) {
// Threads raced, this event is now obsolete.
return true;
}
if (!mProxy->mXMLHttpRequestPrivate) {
// Object was finalized, bail.
return true;
}
if (mType.EqualsASCII(sEventStrings[STRING_loadstart])) {
if (mUploadEvent) {
mProxy->mSeenUploadLoadStart = true;
} else {
mProxy->mSeenLoadStart = true;
}
} else if (mType.EqualsASCII(sEventStrings[STRING_loadend])) {
if (mUploadEvent) {
mProxy->mSeenUploadLoadStart = false;
} else {
if (!mProxy->mSeenLoadStart) {
// We've already dispatched premature abort events.
return true;
}
mProxy->mSeenLoadStart = false;
}
} else if (mType.EqualsASCII(sEventStrings[STRING_abort])) {
if ((mUploadEvent && !mProxy->mSeenUploadLoadStart) ||
(!mUploadEvent && !mProxy->mSeenLoadStart)) {
// We've already dispatched premature abort events.
return true;
}
}
if (mProgressEvent) {
// Cache these for premature abort events.
if (mUploadEvent) {
mProxy->mLastUploadLengthComputable = mLengthComputable;
mProxy->mLastUploadLoaded = mLoaded;
mProxy->mLastUploadTotal = mTotal;
} else {
mProxy->mLastLengthComputable = mLengthComputable;
mProxy->mLastLoaded = mLoaded;
mProxy->mLastTotal = mTotal;
}
}
JS::Rooted<UniquePtr<XMLHttpRequestWorker::StateData>> state(
aCx, new XMLHttpRequestWorker::StateData());
state->mResponseTextResult = mResponseTextResult;
state->mResponseText = mResponseText;
if (NS_SUCCEEDED(mResponseTextResult)) {
MOZ_ASSERT(mResponse.isUndefined() || mResponse.isNull());
state->mResponseResult = mResponseTextResult;
state->mResponse = mResponse;
} else {
state->mResponseResult = mResponseResult;
if (NS_SUCCEEDED(mResponseResult)) {
if (HasData()) {
MOZ_ASSERT(mResponse.isUndefined());
ErrorResult rv;
JS::Rooted<JS::Value> response(aCx);
GlobalObject globalObj(aCx,
aWorkerPrivate->GlobalScope()->GetWrapper());
nsCOMPtr<nsIGlobalObject> global =
do_QueryInterface(globalObj.GetAsSupports());
Read(global, aCx, &response, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return false;
}
state->mResponse = response;
} else {
state->mResponse = mResponse;
}
}
}
state->mStatusResult = mStatusResult;
state->mStatus = mStatus;
state->mStatusText = mStatusText;
state->mReadyState = mReadyState;
state->mResponseURL = mResponseURL;
XMLHttpRequestWorker* xhr = mProxy->mXMLHttpRequestPrivate;
xhr->UpdateState(*state.get(), mUseCachedArrayBufferResponse);
if (mUploadEvent && !xhr->GetUploadObjectNoCreate()) {
return true;
}
XMLHttpRequestEventTarget* target;
if (mUploadEvent) {
target = xhr->GetUploadObjectNoCreate();
} else {
target = xhr;
}
MOZ_ASSERT(target);
RefPtr<Event> event;
if (mProgressEvent) {
ProgressEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mLengthComputable = mLengthComputable;
init.mLoaded = mLoaded;
init.mTotal = mTotal;
event = ProgressEvent::Constructor(target, mType, init);
} else {
event = NS_NewDOMEvent(target, nullptr, nullptr);
if (event) {
event->InitEvent(mType, false, false);
}
}
if (!event) {
return false;
}
event->SetTrusted(true);
target->DispatchEvent(*event);
// After firing the event set mResponse to null for chunked response types.
if (StringBeginsWith(mResponseType, NS_LITERAL_STRING("moz-chunked-"))) {
xhr->NullResponseText();
}
return true;
}
bool WorkerThreadProxySyncRunnable::MainThreadRun() {
AssertIsOnMainThread();
nsCOMPtr<nsIEventTarget> tempTarget = mSyncLoopTarget;
mProxy->mSyncEventResponseTarget.swap(tempTarget);
ErrorResult rv;
RunOnMainThread(rv);
mErrorCode = rv.StealNSResult();
mProxy->mSyncEventResponseTarget.swap(tempTarget);
return true;
}
void AbortRunnable::RunOnMainThread(ErrorResult& aRv) {
mProxy->mInnerEventStreamId++;
WorkerPrivate* oldWorker = mProxy->mWorkerPrivate;
mProxy->mWorkerPrivate = mWorkerPrivate;
mProxy->mXHR->Abort(aRv);
mProxy->mWorkerPrivate = oldWorker;
mProxy->Reset();
}
nsresult OpenRunnable::MainThreadRunInternal() {
if (!mProxy->Init()) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
if (mBackgroundRequest) {
nsresult rv = mProxy->mXHR->SetMozBackgroundRequest(mBackgroundRequest);
NS_ENSURE_SUCCESS(rv, rv);
}
if (mOriginStack) {
mProxy->mXHR->SetOriginStack(std::move(mOriginStack));
}
ErrorResult rv;
if (mWithCredentials) {
mProxy->mXHR->SetWithCredentials(mWithCredentials, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
}
if (mTimeout) {
mProxy->mXHR->SetTimeout(mTimeout, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
}
if (!mMimeTypeOverride.IsVoid()) {
mProxy->mXHR->OverrideMimeType(mMimeTypeOverride, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
}
MOZ_ASSERT(!mProxy->mInOpen);
mProxy->mInOpen = true;
mProxy->mXHR->Open(
mMethod, mURL, true, mUser.WasPassed() ? mUser.Value() : VoidString(),
mPassword.WasPassed() ? mPassword.Value() : VoidString(), rv);
MOZ_ASSERT(mProxy->mInOpen);
mProxy->mInOpen = false;
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
if (mSource) {
mProxy->mXHR->SetSource(std::move(mSource));
}
mProxy->mXHR->SetResponseType(mResponseType, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
return NS_OK;
}
void SendRunnable::RunOnMainThread(ErrorResult& aRv) {
Nullable<
DocumentOrBlobOrArrayBufferViewOrArrayBufferOrFormDataOrURLSearchParamsOrUSVString>
payload;
if (HasData()) {
AutoSafeJSContext cx;
JS::Rooted<JSObject*> globalObject(cx, JS::CurrentGlobalOrNull(cx));
if (NS_WARN_IF(!globalObject)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
nsCOMPtr<nsIGlobalObject> parent = xpc::NativeGlobal(globalObject);
if (NS_WARN_IF(!parent)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
JS::Rooted<JS::Value> body(cx);
Read(parent, cx, &body, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
Maybe<
DocumentOrBlobOrArrayBufferViewOrArrayBufferOrFormDataOrURLSearchParamsOrUSVStringArgument>
holder;
holder.emplace(payload.SetValue());
bool done = false, failed = false, tryNext;
if (body.isObject()) {
done = (failed =
!holder.ref().TrySetToDocument(cx, &body, tryNext, false)) ||
!tryNext ||
(failed = !holder.ref().TrySetToBlob(cx, &body, tryNext, false)) ||
!tryNext ||
(failed = !holder.ref().TrySetToArrayBufferView(cx, &body, tryNext,
false)) ||
!tryNext ||
(failed = !holder.ref().TrySetToArrayBuffer(cx, &body, tryNext,
false)) ||
!tryNext ||
(failed =
!holder.ref().TrySetToFormData(cx, &body, tryNext, false)) ||
!tryNext ||
(failed = !holder.ref().TrySetToURLSearchParams(cx, &body, tryNext,
false)) ||
!tryNext;
}
if (!done) {
done = (failed = !holder.ref().TrySetToUSVString(cx, &body, tryNext)) ||
!tryNext;
}
if (failed || !done) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
} else {
DocumentOrBlobOrArrayBufferViewOrArrayBufferOrFormDataOrURLSearchParamsOrUSVString&
ref = payload.SetValue();
ref.SetAsUSVString().Rebind(mStringBody.Data(), mStringBody.Length());
}
// Send() has been already called, reset the proxy.
if (mProxy->mWorkerPrivate) {
mProxy->Reset();
}
mProxy->mWorkerPrivate = mWorkerPrivate;
MOZ_ASSERT(!mProxy->mSyncLoopTarget);
mProxy->mSyncLoopTarget.swap(mSyncLoopTarget);
if (mHasUploadListeners) {
// Send() can be called more than once before failure,
// so don't attach the upload listeners more than once.
if (!mProxy->mUploadEventListenersAttached &&
!mProxy->AddRemoveEventListeners(true, true)) {
MOZ_ASSERT(false, "This should never fail!");
}
}
mProxy->mArrayBufferResponseWasTransferred = false;
mProxy->mInnerChannelId++;
mProxy->mXHR->Send(nullptr, payload, aRv);
if (!aRv.Failed()) {
mProxy->mOutstandingSendCount++;
if (!mHasUploadListeners) {
// Send() can be called more than once before failure,
// so don't attach the upload listeners more than once.
if (!mProxy->mUploadEventListenersAttached &&
!mProxy->AddRemoveEventListeners(true, true)) {
MOZ_ASSERT(false, "This should never fail!");
}
}
}
}
XMLHttpRequestWorker::XMLHttpRequestWorker(WorkerPrivate* aWorkerPrivate)
: mWorkerPrivate(aWorkerPrivate),
mResponseType(XMLHttpRequestResponseType::_empty),
mTimeout(0),
mBackgroundRequest(false),
mWithCredentials(false),
mCanceled(false),
mMozAnon(false),
mMozSystem(false),
mMimeTypeOverride(VoidString()) {
mWorkerPrivate->AssertIsOnWorkerThread();
mozilla::HoldJSObjects(this);
}
XMLHttpRequestWorker::~XMLHttpRequestWorker() {
mWorkerPrivate->AssertIsOnWorkerThread();
ReleaseProxy(XHRIsGoingAway);
MOZ_ASSERT(!mWorkerRef);
mozilla::DropJSObjects(this);
}
NS_IMPL_ADDREF_INHERITED(XMLHttpRequestWorker, XMLHttpRequestEventTarget)
NS_IMPL_RELEASE_INHERITED(XMLHttpRequestWorker, XMLHttpRequestEventTarget)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XMLHttpRequestWorker)
NS_INTERFACE_MAP_END_INHERITING(XMLHttpRequestEventTarget)
NS_IMPL_CYCLE_COLLECTION_CLASS(XMLHttpRequestWorker)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(XMLHttpRequestWorker,
XMLHttpRequestEventTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mUpload)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(XMLHttpRequestWorker,
XMLHttpRequestEventTarget)
tmp->ReleaseProxy(XHRIsGoingAway);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mUpload)
tmp->mStateData.mResponse.setUndefined();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(XMLHttpRequestWorker,
XMLHttpRequestEventTarget)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mStateData.mResponse)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
/* static */
already_AddRefed<XMLHttpRequest> XMLHttpRequestWorker::Construct(
const GlobalObject& aGlobal, const MozXMLHttpRequestParameters& aParams,
ErrorResult& aRv) {
JSContext* cx = aGlobal.Context();
WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
MOZ_ASSERT(workerPrivate);
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
if (NS_WARN_IF(!global)) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
RefPtr<XMLHttpRequestWorker> xhr = new XMLHttpRequestWorker(workerPrivate);
xhr->BindToOwner(global);
if (workerPrivate->XHRParamsAllowed()) {
if (aParams.mMozSystem)
xhr->mMozAnon = true;
else
xhr->mMozAnon = aParams.mMozAnon;
xhr->mMozSystem = aParams.mMozSystem;
}
return xhr.forget();
}
void XMLHttpRequestWorker::ReleaseProxy(ReleaseType aType) {
// Can't assert that we're on the worker thread here because mWorkerPrivate
// may be gone.
if (mProxy) {
if (aType == XHRIsGoingAway) {
// We're in a GC finalizer, so we can't do a sync call here (and we don't
// need to).
RefPtr<AsyncTeardownRunnable> runnable =
new AsyncTeardownRunnable(mProxy);
mProxy = nullptr;
if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable.forget()))) {
NS_ERROR("Failed to dispatch teardown runnable!");
}
} else {
// This isn't necessary if the worker is going away or the XHR is going
// away.
if (aType == Default) {
// Don't let any more events run.
mProxy->mOuterEventStreamId++;
}
// We need to make a sync call here.
RefPtr<SyncTeardownRunnable> runnable =
new SyncTeardownRunnable(mWorkerPrivate, mProxy);
mProxy = nullptr;
IgnoredErrorResult forAssertionsOnly;
// This runnable _must_ be executed.
runnable->Dispatch(Dead, forAssertionsOnly);
MOZ_DIAGNOSTIC_ASSERT(!forAssertionsOnly.Failed());
}
}
}
void XMLHttpRequestWorker::MaybePin(ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mWorkerRef) {
return;
}
RefPtr<XMLHttpRequestWorker> self = this;
mWorkerRef =
StrongWorkerRef::Create(mWorkerPrivate, "XMLHttpRequestWorker", [self]() {
if (!self->mCanceled) {
self->mCanceled = true;
self->ReleaseProxy(WorkerIsGoingAway);
}
});
if (NS_WARN_IF(!mWorkerRef)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
NS_ADDREF_THIS();
}
void XMLHttpRequestWorker::MaybeDispatchPrematureAbortEvents(ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
MOZ_ASSERT(mProxy);
// Only send readystatechange event when state changed.
bool isStateChanged = false;
if ((mStateData.mReadyState == 1 && mStateData.mFlagSend) ||
mStateData.mReadyState == 2 || mStateData.mReadyState == 3) {
isStateChanged = true;
mStateData.mReadyState = 4;
}
if (mProxy->mSeenUploadLoadStart) {
MOZ_ASSERT(mUpload);
DispatchPrematureAbortEvent(mUpload, NS_LITERAL_STRING("abort"), true, aRv);
if (aRv.Failed()) {
return;
}
DispatchPrematureAbortEvent(mUpload, NS_LITERAL_STRING("loadend"), true,
aRv);
if (aRv.Failed()) {
return;
}
mProxy->mSeenUploadLoadStart = false;
}
if (mProxy->mSeenLoadStart) {
if (isStateChanged) {
DispatchPrematureAbortEvent(this, NS_LITERAL_STRING("readystatechange"),
false, aRv);
if (aRv.Failed()) {
return;
}
}
DispatchPrematureAbortEvent(this, NS_LITERAL_STRING("abort"), false, aRv);
if (aRv.Failed()) {
return;
}
DispatchPrematureAbortEvent(this, NS_LITERAL_STRING("loadend"), false, aRv);
if (aRv.Failed()) {
return;
}
// Similarly to null check in ::Open, mProxy may have been cleared here.
if (!mProxy) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
mProxy->mSeenLoadStart = false;
}
}
void XMLHttpRequestWorker::DispatchPrematureAbortEvent(
EventTarget* aTarget, const nsAString& aEventType, bool aUploadTarget,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
MOZ_ASSERT(aTarget);
if (!mProxy) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
RefPtr<Event> event;
if (aEventType.EqualsLiteral("readystatechange")) {
event = NS_NewDOMEvent(aTarget, nullptr, nullptr);
event->InitEvent(aEventType, false, false);
} else {
if (mProxy->mIsSyncXHR &&
aEventType.EqualsASCII(sEventStrings[STRING_progress])) {
return;
}
ProgressEventInit init;
init.mBubbles = false;
init.mCancelable = false;
if (aUploadTarget) {
init.mLengthComputable = mProxy->mLastUploadLengthComputable;
init.mLoaded = mProxy->mLastUploadLoaded;
init.mTotal = mProxy->mLastUploadTotal;
} else {
init.mLengthComputable = mProxy->mLastLengthComputable;
init.mLoaded = mProxy->mLastLoaded;
init.mTotal = mProxy->mLastTotal;
}
event = ProgressEvent::Constructor(aTarget, aEventType, init);
}
if (!event) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
event->SetTrusted(true);
aTarget->DispatchEvent(*event);
}
void XMLHttpRequestWorker::Unpin() {
mWorkerPrivate->AssertIsOnWorkerThread();
MOZ_ASSERT(mWorkerRef, "Mismatched calls to Unpin!");
mWorkerRef = nullptr;
NS_RELEASE_THIS();
}
void XMLHttpRequestWorker::SendInternal(SendRunnable* aRunnable,
ErrorResult& aRv) {
MOZ_ASSERT(aRunnable);
mWorkerPrivate->AssertIsOnWorkerThread();
// No send() calls when open is running.
if (mProxy->mOpenCount) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
bool hasUploadListeners = mUpload ? mUpload->HasListeners() : false;
MaybePin(aRv);
if (aRv.Failed()) {
return;
}
AutoUnpinXHR autoUnpin(this);
Maybe<AutoSyncLoopHolder> autoSyncLoop;
nsCOMPtr<nsIEventTarget> syncLoopTarget;
bool isSyncXHR = mProxy->mIsSyncXHR;
if (isSyncXHR) {
autoSyncLoop.emplace(mWorkerPrivate, Canceling);
syncLoopTarget = autoSyncLoop->GetEventTarget();
if (!syncLoopTarget) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
}
mProxy->mOuterChannelId++;
aRunnable->SetSyncLoopTarget(syncLoopTarget);
aRunnable->SetHaveUploadListeners(hasUploadListeners);
mStateData.mFlagSend = true;
aRunnable->Dispatch(Canceling, aRv);
if (aRv.Failed()) {
// Dispatch() may have spun the event loop and we may have already unrooted.
// If so we don't want autoUnpin to try again.
if (!mWorkerRef) {
autoUnpin.Clear();
}
return;
}
if (!isSyncXHR) {
autoUnpin.Clear();
MOZ_ASSERT(!autoSyncLoop);
return;
}
autoUnpin.Clear();
bool succeeded = autoSyncLoop->Run();
mStateData.mFlagSend = false;
// Don't clobber an existing exception that we may have thrown on aRv
// already... though can there really be one? In any case, it seems to me
// that this autoSyncLoop->Run() can never fail, since the StopSyncLoop call
// for it will come from ProxyCompleteRunnable and that always passes true for
// the second arg.
if (!succeeded && !aRv.Failed()) {
aRv.Throw(NS_ERROR_FAILURE);
}
}
void XMLHttpRequestWorker::Open(const nsACString& aMethod,
const nsAString& aUrl, bool aAsync,
const Optional<nsAString>& aUser,
const Optional<nsAString>& aPassword,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
bool alsoOverrideMimeType = false;
if (mProxy) {
MaybeDispatchPrematureAbortEvents(aRv);
if (aRv.Failed()) {
return;
}
} else {
Maybe<ClientInfo> clientInfo(mWorkerPrivate->GetClientInfo());
if (clientInfo.isNothing()) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
mProxy = new Proxy(this, clientInfo.ref(), mWorkerPrivate->GetController(),
mMozAnon, mMozSystem);
alsoOverrideMimeType = true;
}
mProxy->mOuterEventStreamId++;
UniquePtr<SerializedStackHolder> stack;
if (mWorkerPrivate->IsWatchedByDevtools()) {
if (JSContext* cx = nsContentUtils::GetCurrentJSContext()) {
stack = GetCurrentStackForNetMonitor(cx);
}
}
RefPtr<OpenRunnable> runnable = new OpenRunnable(
mWorkerPrivate, mProxy, aMethod, aUrl, aUser, aPassword,
mBackgroundRequest, mWithCredentials, mTimeout, mResponseType,
alsoOverrideMimeType ? mMimeTypeOverride : VoidString(), std::move(stack),
profiler_get_backtrace());
++mProxy->mOpenCount;
runnable->Dispatch(Canceling, aRv);
if (aRv.Failed()) {
if (mProxy && !--mProxy->mOpenCount) {
ReleaseProxy();
}
return;
}
// We have been released in one of the nested Open() calls.
if (!mProxy) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
--mProxy->mOpenCount;
mProxy->mIsSyncXHR = !aAsync;
}
void XMLHttpRequestWorker::SetRequestHeader(const nsACString& aHeader,
const nsACString& aValue,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
if (!mProxy) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
RefPtr<SetRequestHeaderRunnable> runnable =
new SetRequestHeaderRunnable(mWorkerPrivate, mProxy, aHeader, aValue);
runnable->Dispatch(Canceling, aRv);
}
void XMLHttpRequestWorker::SetTimeout(uint32_t aTimeout, ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
mTimeout = aTimeout;
if (!mProxy) {
// Open may not have been called yet, in which case we'll handle the
// timeout in OpenRunnable.
return;
}
RefPtr<SetTimeoutRunnable> runnable =
new SetTimeoutRunnable(mWorkerPrivate, mProxy, aTimeout);
runnable->Dispatch(Canceling, aRv);
}
void XMLHttpRequestWorker::SetWithCredentials(bool aWithCredentials,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
mWithCredentials = aWithCredentials;
if (!mProxy) {
// Open may not have been called yet, in which case we'll handle the
// credentials in OpenRunnable.
return;
}
RefPtr<SetWithCredentialsRunnable> runnable =
new SetWithCredentialsRunnable(mWorkerPrivate, mProxy, aWithCredentials);
runnable->Dispatch(Canceling, aRv);
}
void XMLHttpRequestWorker::SetMozBackgroundRequest(bool aBackgroundRequest,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
mBackgroundRequest = aBackgroundRequest;
if (!mProxy) {
// Open may not have been called yet, in which case we'll handle the
// background request in OpenRunnable.
return;
}
RefPtr<SetBackgroundRequestRunnable> runnable =
new SetBackgroundRequestRunnable(mWorkerPrivate, mProxy,
aBackgroundRequest);
runnable->Dispatch(Canceling, aRv);
}
XMLHttpRequestUpload* XMLHttpRequestWorker::GetUpload(ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return nullptr;
}
if (!mUpload) {
mUpload = new XMLHttpRequestUpload(this);
if (!mUpload) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
}
return mUpload;
}
void XMLHttpRequestWorker::Send(
JSContext* aCx,
const Nullable<
DocumentOrBlobOrArrayBufferViewOrArrayBufferOrFormDataOrURLSearchParamsOrUSVString>&
aData,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
if (!mProxy) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
RefPtr<SendRunnable> sendRunnable;
if (aData.IsNull()) {
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy, VoidString());
// Nothing to clone.
}
else if (aData.Value().IsDocument()) {
MOZ_CRASH("Documents are not exposed to workers.");
}
else if (aData.Value().IsBlob()) {
RefPtr<Blob> blob = &aData.Value().GetAsBlob();
MOZ_ASSERT(blob);
RefPtr<BlobImpl> blobImpl = blob->Impl();
MOZ_ASSERT(blobImpl);
aRv = blobImpl->SetMutable(false);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, blob, &value)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy, EmptyString());
sendRunnable->Write(aCx, value, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
}
else if (aData.Value().IsArrayBuffer()) {
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy, EmptyString());
JS::Rooted<JS::Value> value(aCx);
value.setObject(*aData.Value().GetAsArrayBuffer().Obj());
sendRunnable->Write(aCx, value, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
}
else if (aData.Value().IsArrayBufferView()) {
const ArrayBufferView& body = aData.Value().GetAsArrayBufferView();
if (JS_IsTypedArrayObject(body.Obj()) &&
JS_GetTypedArraySharedness(body.Obj())) {
// Throw if the object is mapping shared memory (must opt in).
aRv.ThrowTypeError<MSG_TYPEDARRAY_IS_SHARED>(
NS_LITERAL_STRING("Argument of XMLHttpRequest.send"));
return;
}
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy, EmptyString());
JS::Rooted<JS::Value> value(aCx);
value.setObject(*body.Obj());
sendRunnable->Write(aCx, value, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
}
else if (aData.Value().IsFormData()) {
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, &aData.Value().GetAsFormData(), &value)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy, EmptyString());
sendRunnable->Write(aCx, value, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
}
else if (aData.Value().IsURLSearchParams()) {
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, &aData.Value().GetAsURLSearchParams(),
&value)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy, EmptyString());
sendRunnable->Write(aCx, value, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
}
else if (aData.Value().IsUSVString()) {
sendRunnable = new SendRunnable(mWorkerPrivate, mProxy,
aData.Value().GetAsUSVString());
// Nothing to clone.
}
MOZ_ASSERT(sendRunnable);
SendInternal(sendRunnable, aRv);
}
void XMLHttpRequestWorker::Abort(ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
if (!mProxy) {
return;
}
// Set our status to 0 and statusText to "" if we
// will be aborting an ongoing fetch, so the upcoming
// abort events we dispatch have the correct info.
if ((mStateData.mReadyState == XMLHttpRequest_Binding::OPENED &&
mStateData.mFlagSend) ||
mStateData.mReadyState == XMLHttpRequest_Binding::HEADERS_RECEIVED ||
mStateData.mReadyState == XMLHttpRequest_Binding::LOADING ||
mStateData.mReadyState == XMLHttpRequest_Binding::DONE) {
mStateData.mStatus = 0;
mStateData.mStatusText.Truncate();
}
MaybeDispatchPrematureAbortEvents(aRv);
if (aRv.Failed()) {
return;
}
if (mStateData.mReadyState == 4) {
// No one did anything to us while we fired abort events, so reset our state
// to "unsent"
mStateData.mReadyState = 0;
}
mProxy->mOuterEventStreamId++;
RefPtr<AbortRunnable> runnable = new AbortRunnable(mWorkerPrivate, mProxy);
runnable->Dispatch(Canceling, aRv);
}
void XMLHttpRequestWorker::GetResponseHeader(const nsACString& aHeader,
nsACString& aResponseHeader,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
if (!mProxy) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
nsCString responseHeader;
RefPtr<GetResponseHeaderRunnable> runnable = new GetResponseHeaderRunnable(
mWorkerPrivate, mProxy, aHeader, responseHeader);
runnable->Dispatch(Canceling, aRv);
if (aRv.Failed()) {
return;
}
aResponseHeader = responseHeader;
}
void XMLHttpRequestWorker::GetAllResponseHeaders(nsACString& aResponseHeaders,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
if (!mProxy) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
nsCString responseHeaders;
RefPtr<GetAllResponseHeadersRunnable> runnable =
new GetAllResponseHeadersRunnable(mWorkerPrivate, mProxy,
responseHeaders);
runnable->Dispatch(Canceling, aRv);
if (aRv.Failed()) {
return;
}
aResponseHeaders = responseHeaders;
}
void XMLHttpRequestWorker::OverrideMimeType(const nsAString& aMimeType,
ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
if (mCanceled) {
aRv.ThrowUncatchableException();
return;
}
// We're supposed to throw if the state is LOADING or DONE.
if (mStateData.mReadyState == XMLHttpRequest_Binding::LOADING ||
mStateData.mReadyState == XMLHttpRequest_Binding::DONE) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
mMimeTypeOverride = aMimeType;
if (mProxy) {
RefPtr<OverrideMimeTypeRunnable> runnable =
new OverrideMimeTypeRunnable(mWorkerPrivate, mProxy, aMimeType);
runnable->Dispatch(Canceling, aRv);
}
}
void XMLHttpRequestWorker::SetResponseType(
XMLHttpRequestResponseType aResponseType, ErrorResult& aRv) {
mWorkerPrivate->AssertIsOnWorkerThread();
// "document" is fine for the main thread but not for a worker. Short-circuit
// that here.
if (aResponseType == XMLHttpRequestResponseType::Document) {
return;
}
if (!mProxy) {
// Open() has not been called yet. We store the responseType and we will use
// it later in Open().
mResponseType = aResponseType;
return;
}
if (mStateData.mReadyState == XMLHttpRequest_Binding::LOADING ||
mStateData.mReadyState == XMLHttpRequest_Binding::DONE) {
aRv.Throw(
NS_ERROR_DOM_INVALID_STATE_XHR_MUST_NOT_BE_LOADING_OR_DONE_RESPONSE_TYPE);
return;
}
RefPtr<SetResponseTypeRunnable> runnable =
new SetResponseTypeRunnable(mWorkerPrivate, mProxy, aResponseType);
runnable->Dispatch(Canceling, aRv);
if (aRv.Failed()) {
return;
}
mResponseType = runnable->ResponseType();
}
void XMLHttpRequestWorker::GetResponse(JSContext* /* unused */,
JS::MutableHandle<JS::Value> aResponse,
ErrorResult& aRv) {
if (NS_SUCCEEDED(mStateData.mResponseTextResult) &&
mStateData.mResponse.isUndefined()) {
MOZ_ASSERT(NS_SUCCEEDED(mStateData.mResponseResult));
if (mStateData.mResponseText.IsEmpty()) {
mStateData.mResponse =
JS_GetEmptyStringValue(mWorkerPrivate->GetJSContext());
} else {
XMLHttpRequestStringSnapshotReaderHelper helper(mStateData.mResponseText);
JSString* str = JS_NewUCStringCopyN(mWorkerPrivate->GetJSContext(),
helper.Buffer(), helper.Length());
if (!str) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
mStateData.mResponse.setString(str);
}
}
aRv = mStateData.mResponseResult;
aResponse.set(mStateData.mResponse);
}
void XMLHttpRequestWorker::GetResponseText(DOMString& aResponseText,
ErrorResult& aRv) {
aRv = mStateData.mResponseTextResult;
if (aRv.Failed()) {
return;
}
if (!mStateData.mResponseText.GetAsString(aResponseText)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
}
void XMLHttpRequestWorker::UpdateState(const StateData& aStateData,
bool aUseCachedArrayBufferResponse) {
if (aUseCachedArrayBufferResponse) {
MOZ_ASSERT(mStateData.mResponse.isObject() &&
JS::IsArrayBufferObject(&mStateData.mResponse.toObject()));
JS::Rooted<JS::Value> response(mWorkerPrivate->GetJSContext(),
mStateData.mResponse);
mStateData = aStateData;
mStateData.mResponse = response;
} else {
mStateData = aStateData;
}
XMLHttpRequest_Binding::ClearCachedResponseTextValue(this);
}
} // namespace dom
} // namespace mozilla
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