Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#include "StreamFilterParent.h"
#include "HttpChannelChild.h"
#include "mozilla/ExtensionPolicyService.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/net/ChannelEventQueue.h"
#include "mozilla/StaticPrefs_extensions.h"
#include "mozilla/Try.h"
#include "nsHttpChannel.h"
#include "nsIChannel.h"
#include "nsIInputStream.h"
#include "nsITraceableChannel.h"
#include "nsProxyRelease.h"
#include "nsQueryObject.h"
#include "nsSocketTransportService2.h"
#include "nsStringStream.h"
#include "mozilla/net/DocumentChannelChild.h"
#include "nsIViewSourceChannel.h"
namespace mozilla {
namespace extensions {
/*****************************************************************************
* Event queueing helpers
*****************************************************************************/
using net::ChannelEvent;
using net::ChannelEventQueue;
namespace {
// Define some simple ChannelEvent sub-classes that store the appropriate
// EventTarget and delegate their Run methods to a wrapped Runnable or lambda
// function.
class ChannelEventWrapper : public ChannelEvent {
public:
ChannelEventWrapper(nsIEventTarget* aTarget) : mTarget(aTarget) {}
already_AddRefed<nsIEventTarget> GetEventTarget() override {
return do_AddRef(mTarget);
}
protected:
~ChannelEventWrapper() override = default;
private:
nsCOMPtr<nsIEventTarget> mTarget;
};
class ChannelEventFunction final : public ChannelEventWrapper {
public:
ChannelEventFunction(nsIEventTarget* aTarget, std::function<void()>&& aFunc)
: ChannelEventWrapper(aTarget), mFunc(std::move(aFunc)) {}
void Run() override { mFunc(); }
protected:
~ChannelEventFunction() override = default;
private:
std::function<void()> mFunc;
};
class ChannelEventRunnable final : public ChannelEventWrapper {
public:
ChannelEventRunnable(nsIEventTarget* aTarget,
already_AddRefed<Runnable> aRunnable)
: ChannelEventWrapper(aTarget), mRunnable(aRunnable) {}
void Run() override {
nsresult rv = mRunnable->Run();
Unused << NS_WARN_IF(NS_FAILED(rv));
}
protected:
~ChannelEventRunnable() override = default;
private:
RefPtr<Runnable> mRunnable;
};
} // anonymous namespace
/*****************************************************************************
* Initialization
*****************************************************************************/
StreamFilterParent::StreamFilterParent()
: mMainThread(GetCurrentSerialEventTarget()),
mIOThread(mMainThread),
mQueue(new ChannelEventQueue(static_cast<nsIStreamListener*>(this))),
mBufferMutex("StreamFilter buffer mutex"),
mReceivedStop(false),
mSentStop(false),
mContext(nullptr),
mOffset(0),
mState(State::Uninitialized) {}
StreamFilterParent::~StreamFilterParent() {
NS_ReleaseOnMainThread("StreamFilterParent::mChannel", mChannel.forget());
NS_ReleaseOnMainThread("StreamFilterParent::mLoadGroup", mLoadGroup.forget());
NS_ReleaseOnMainThread("StreamFilterParent::mOrigListener",
mOrigListener.forget());
NS_ReleaseOnMainThread("StreamFilterParent::mContext", mContext.forget());
mQueue->NotifyReleasingOwner();
}
auto StreamFilterParent::Create(dom::ContentParent* aContentParent,
uint64_t aChannelId, const nsAString& aAddonId)
-> RefPtr<ChildEndpointPromise> {
AssertIsMainThread();
auto& webreq = WebRequestService::GetSingleton();
RefPtr<extensions::WebExtensionPolicy> addonPolicy =
ExtensionPolicyService::GetSingleton().GetByID(aAddonId);
if (!addonPolicy) {
return ChildEndpointPromise::CreateAndReject(false, __func__);
}
nsCOMPtr<nsITraceableChannel> channel =
webreq.GetTraceableChannel(aChannelId, *addonPolicy, aContentParent);
RefPtr<mozilla::net::nsHttpChannel> chan = do_QueryObject(channel);
if (!chan) {
return ChildEndpointPromise::CreateAndReject(false, __func__);
}
nsCOMPtr<nsIChannel> genChan(do_QueryInterface(channel));
if (!StaticPrefs::extensions_filterResponseServiceWorkerScript_disabled() &&
ChannelWrapper::IsServiceWorkerScript(genChan) &&
!addonPolicy->HasPermission(
nsGkAtoms::webRequestFilterResponse_serviceWorkerScript)) {
return ChildEndpointPromise::CreateAndReject(false, __func__);
}
// Disable alt-data for extension stream listeners.
nsCOMPtr<nsIHttpChannelInternal> internal(do_QueryObject(channel));
internal->DisableAltDataCache();
return chan->AttachStreamFilter();
}
/* static */
void StreamFilterParent::Attach(nsIChannel* aChannel,
ParentEndpoint&& aEndpoint) {
auto self = MakeRefPtr<StreamFilterParent>();
self->ActorThread()->Dispatch(
NewRunnableMethod<ParentEndpoint&&>("StreamFilterParent::Bind", self,
&StreamFilterParent::Bind,
std::move(aEndpoint)),
NS_DISPATCH_NORMAL);
// If aChannel is a HttpChannelChild, ask HttpChannelChild to hold a weak
// reference on this StreamFilterParent. Such that HttpChannelChild has a
// chance to disconnect this StreamFilterParent if internal redirection
// happens, i.e. ServiceWorker fallback redirection.
RefPtr<net::HttpChannelChild> channelChild = do_QueryObject(aChannel);
if (channelChild) {
channelChild->RegisterStreamFilter(self);
}
self->Init(aChannel);
}
void StreamFilterParent::Disconnect(const nsACString& aReason) {
AssertIsMainThread();
MOZ_DIAGNOSTIC_ASSERT(mBeforeOnStartRequest);
mDisconnected = true;
nsAutoCString reason(aReason);
RefPtr<StreamFilterParent> self(this);
RunOnActorThread(FUNC, [self, reason] {
if (self->IPCActive()) {
self->mState = State::Disconnected;
self->CheckResult(self->SendError(reason));
}
});
}
void StreamFilterParent::Bind(ParentEndpoint&& aEndpoint) {
aEndpoint.Bind(this);
}
void StreamFilterParent::Init(nsIChannel* aChannel) {
mChannel = aChannel;
nsCOMPtr<nsITraceableChannel> traceable = do_QueryInterface(aChannel);
if (MOZ_UNLIKELY(!traceable)) {
// nsViewSourceChannel is not nsITraceableChannel, but wraps one. Unwrap it.
nsCOMPtr<nsIViewSourceChannel> vsc = do_QueryInterface(aChannel);
if (vsc) {
traceable = do_QueryObject(vsc->GetInnerChannel());
// OnStartRequest etc. is passed the unwrapped channel, so update mChannel
// to prevent OnStartRequest from mistaking it for a redirect, which would
// close the filter.
mChannel = do_QueryObject(traceable);
}
MOZ_RELEASE_ASSERT(traceable);
}
nsresult rv =
traceable->SetNewListener(this, /* aMustApplyContentConversion = */ true,
getter_AddRefs(mOrigListener));
MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
}
/*****************************************************************************
* nsIThreadRetargetableStreamListener
*****************************************************************************/
NS_IMETHODIMP
StreamFilterParent::CheckListenerChain() {
AssertIsMainThread();
nsCOMPtr<nsIThreadRetargetableStreamListener> trsl =
do_QueryInterface(mOrigListener);
if (trsl) {
return trsl->CheckListenerChain();
}
return NS_ERROR_NO_INTERFACE;
}
NS_IMETHODIMP
StreamFilterParent::OnDataFinished(nsresult aStatus) {
AssertIsIOThread();
// Forwarding onDataFinished to the mOriginListener when:
// - the StreamFilter is already disconnected
// - it does not have any buffered data which would still need
// to be sent to the mOrigListener and we have
// - we have not yet called mOrigListener OnStopRequest method.
if (!mDisconnected || !mBufferedData.isEmpty() || mSentStop) {
return NS_OK;
}
nsCOMPtr<nsIThreadRetargetableStreamListener> listener =
do_QueryInterface(mOrigListener);
if (listener) {
return listener->OnDataFinished(aStatus);
}
return NS_OK;
}
/*****************************************************************************
* Error handling
*****************************************************************************/
void StreamFilterParent::Broken() {
AssertIsActorThread();
switch (mState) {
case State::Initialized:
case State::TransferringData:
case State::Suspended: {
mState = State::Disconnecting;
RefPtr<StreamFilterParent> self(this);
RunOnMainThread(FUNC, [=] {
if (self->mChannel) {
self->mChannel->Cancel(NS_ERROR_FAILURE);
}
});
FinishDisconnect();
} break;
default:
break;
}
}
/*****************************************************************************
* State change requests
*****************************************************************************/
IPCResult StreamFilterParent::RecvClose() {
AssertIsActorThread();
mState = State::Closed;
if (!mSentStop) {
RefPtr<StreamFilterParent> self(this);
RunOnMainThread(FUNC, [=] {
nsresult rv = self->EmitStopRequest(NS_OK);
Unused << NS_WARN_IF(NS_FAILED(rv));
});
}
Unused << SendClosed();
Destroy();
return IPC_OK();
}
void StreamFilterParent::Destroy() {
// Close the channel asynchronously so the actor is never destroyed before
// this message is fully processed.
ActorThread()->Dispatch(NewRunnableMethod("StreamFilterParent::Close", this,
&StreamFilterParent::Close),
NS_DISPATCH_NORMAL);
}
IPCResult StreamFilterParent::RecvDestroy() {
AssertIsActorThread();
Destroy();
return IPC_OK();
}
IPCResult StreamFilterParent::RecvSuspend() {
AssertIsActorThread();
if (mState == State::TransferringData) {
RefPtr<StreamFilterParent> self(this);
RunOnMainThread(FUNC, [=] {
self->mChannel->Suspend();
RunOnActorThread(FUNC, [=] {
if (self->IPCActive()) {
self->mState = State::Suspended;
self->CheckResult(self->SendSuspended());
}
});
});
}
return IPC_OK();
}
IPCResult StreamFilterParent::RecvResume() {
AssertIsActorThread();
if (mState == State::Suspended) {
// Change state before resuming so incoming data is handled correctly
// immediately after resuming.
mState = State::TransferringData;
RefPtr<StreamFilterParent> self(this);
RunOnMainThread(FUNC, [=] {
self->mChannel->Resume();
RunOnActorThread(FUNC, [=] {
if (self->IPCActive()) {
self->CheckResult(self->SendResumed());
}
});
});
}
return IPC_OK();
}
IPCResult StreamFilterParent::RecvDisconnect() {
AssertIsActorThread();
if (mState == State::Suspended) {
RefPtr<StreamFilterParent> self(this);
RunOnMainThread(FUNC, [=] { self->mChannel->Resume(); });
} else if (mState != State::TransferringData) {
return IPC_OK();
}
mState = State::Disconnecting;
CheckResult(SendFlushData());
return IPC_OK();
}
IPCResult StreamFilterParent::RecvFlushedData() {
AssertIsActorThread();
MOZ_ASSERT(mState == State::Disconnecting);
Destroy();
FinishDisconnect();
return IPC_OK();
}
void StreamFilterParent::FinishDisconnect() {
RefPtr<StreamFilterParent> self(this);
RunOnIOThread(FUNC, [=] {
self->FlushBufferedData();
RunOnMainThread(FUNC, [=] {
if (self->mReceivedStop && !self->mSentStop) {
nsresult rv = self->EmitStopRequest(NS_OK);
Unused << NS_WARN_IF(NS_FAILED(rv));
} else if (self->mLoadGroup && !self->mDisconnected) {
Unused << self->mLoadGroup->RemoveRequest(self, nullptr, NS_OK);
}
self->mDisconnected = true;
});
RunOnActorThread(FUNC, [=] {
if (self->mState != State::Closed) {
self->mState = State::Disconnected;
}
});
});
}
/*****************************************************************************
* Data output
*****************************************************************************/
IPCResult StreamFilterParent::RecvWrite(Data&& aData) {
AssertIsActorThread();
RunOnIOThread(NewRunnableMethod<Data&&>("StreamFilterParent::WriteMove", this,
&StreamFilterParent::WriteMove,
std::move(aData)));
return IPC_OK();
}
void StreamFilterParent::WriteMove(Data&& aData) {
nsresult rv = Write(aData);
Unused << NS_WARN_IF(NS_FAILED(rv));
}
nsresult StreamFilterParent::Write(Data& aData) {
AssertIsIOThread();
nsCOMPtr<nsIInputStream> stream;
nsresult rv = NS_NewByteInputStream(
getter_AddRefs(stream),
Span(reinterpret_cast<char*>(aData.Elements()), aData.Length()),
NS_ASSIGNMENT_DEPEND);
NS_ENSURE_SUCCESS(rv, rv);
rv =
mOrigListener->OnDataAvailable(mChannel, stream, mOffset, aData.Length());
NS_ENSURE_SUCCESS(rv, rv);
mOffset += aData.Length();
return NS_OK;
}
/*****************************************************************************
* nsIRequest
*****************************************************************************/
NS_IMETHODIMP
StreamFilterParent::GetName(nsACString& aName) {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
return mChannel->GetName(aName);
}
NS_IMETHODIMP
StreamFilterParent::GetStatus(nsresult* aStatus) {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
return mChannel->GetStatus(aStatus);
}
NS_IMETHODIMP
StreamFilterParent::IsPending(bool* aIsPending) {
switch (mState) {
case State::Initialized:
case State::TransferringData:
case State::Suspended:
*aIsPending = true;
break;
default:
*aIsPending = false;
}
return NS_OK;
}
NS_IMETHODIMP StreamFilterParent::SetCanceledReason(const nsACString& aReason) {
return SetCanceledReasonImpl(aReason);
}
NS_IMETHODIMP StreamFilterParent::GetCanceledReason(nsACString& aReason) {
return GetCanceledReasonImpl(aReason);
}
NS_IMETHODIMP StreamFilterParent::CancelWithReason(nsresult aStatus,
const nsACString& aReason) {
return CancelWithReasonImpl(aStatus, aReason);
}
NS_IMETHODIMP
StreamFilterParent::Cancel(nsresult aResult) {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
return mChannel->Cancel(aResult);
}
NS_IMETHODIMP
StreamFilterParent::Suspend() {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
return mChannel->Suspend();
}
NS_IMETHODIMP
StreamFilterParent::Resume() {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
return mChannel->Resume();
}
NS_IMETHODIMP
StreamFilterParent::GetLoadGroup(nsILoadGroup** aLoadGroup) {
*aLoadGroup = mLoadGroup;
return NS_OK;
}
NS_IMETHODIMP
StreamFilterParent::SetLoadGroup(nsILoadGroup* aLoadGroup) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
StreamFilterParent::GetLoadFlags(nsLoadFlags* aLoadFlags) {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
MOZ_TRY(mChannel->GetLoadFlags(aLoadFlags));
*aLoadFlags &= ~nsIChannel::LOAD_DOCUMENT_URI;
return NS_OK;
}
NS_IMETHODIMP
StreamFilterParent::SetLoadFlags(nsLoadFlags aLoadFlags) {
AssertIsMainThread();
MOZ_ASSERT(mChannel);
return mChannel->SetLoadFlags(aLoadFlags);
}
NS_IMETHODIMP
StreamFilterParent::GetTRRMode(nsIRequest::TRRMode* aTRRMode) {
return GetTRRModeImpl(aTRRMode);
}
NS_IMETHODIMP
StreamFilterParent::SetTRRMode(nsIRequest::TRRMode aTRRMode) {
return SetTRRModeImpl(aTRRMode);
}
/*****************************************************************************
* nsIStreamListener
*****************************************************************************/
NS_IMETHODIMP
StreamFilterParent::OnStartRequest(nsIRequest* aRequest) {
AssertIsMainThread();
// Always reset mChannel if aRequest is different. Various calls in
// StreamFilterParent will use mChannel, but aRequest is *always* the
// right channel to use at this point.
//
// For ALL redirections, we will disconnect this listener. Extensions
// will create a new filter if they need it.
mBeforeOnStartRequest = false;
if (aRequest != mChannel) {
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
nsCOMPtr<nsILoadInfo> loadInfo = channel ? channel->LoadInfo() : nullptr;
mChannel = channel;
if (!(loadInfo &&
loadInfo->RedirectChainIncludingInternalRedirects().IsEmpty())) {
mDisconnected = true;
mDisconnectedByOnStartRequest = true;
RefPtr<StreamFilterParent> self(this);
RunOnActorThread(FUNC, [=] {
if (self->IPCActive()) {
self->mState = State::Disconnected;
CheckResult(self->SendError("Channel redirected"_ns));
}
});
}
}
// Check if alterate cached data is being sent, if so we receive un-decoded
// data and we must disconnect the filter and send an error to the extension.
if (!mDisconnected) {
RefPtr<net::HttpBaseChannel> chan = do_QueryObject(aRequest);
if (chan && chan->IsDeliveringAltData()) {
mDisconnected = true;
mDisconnectedByOnStartRequest = true;
RefPtr<StreamFilterParent> self(this);
RunOnActorThread(FUNC, [=] {
if (self->IPCActive()) {
self->mState = State::Disconnected;
CheckResult(
self->SendError("Channel is delivering cached alt-data"_ns));
}
});
}
}
if (!mDisconnected) {
Unused << mChannel->GetLoadGroup(getter_AddRefs(mLoadGroup));
if (mLoadGroup) {
Unused << mLoadGroup->AddRequest(this, nullptr);
}
}
nsresult rv = mOrigListener->OnStartRequest(aRequest);
// Important: Do this only *after* running the next listener in the chain, so
// that we get the final delivery target after any retargeting that it may do.
if (nsCOMPtr<nsIThreadRetargetableRequest> req =
do_QueryInterface(aRequest)) {
nsCOMPtr<nsISerialEventTarget> thread;
Unused << req->GetDeliveryTarget(getter_AddRefs(thread));
if (thread) {
mIOThread = std::move(thread);
}
}
// Important: Do this *after* we have set the thread delivery target, or it is
// possible in rare circumstances for an extension to attempt to write data
// before the thread has been set up, even though there are several layers of
// asynchrony involved.
if (!mDisconnected) {
RefPtr<StreamFilterParent> self(this);
RunOnActorThread(FUNC, [=] {
if (self->IPCActive()) {
self->mState = State::TransferringData;
self->CheckResult(self->SendStartRequest());
}
});
}
return rv;
}
NS_IMETHODIMP
StreamFilterParent::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
AssertIsMainThread();
MOZ_ASSERT(aRequest == mChannel);
mReceivedStop = true;
if (mDisconnected) {
return EmitStopRequest(aStatusCode);
}
RefPtr<StreamFilterParent> self(this);
RunOnActorThread(FUNC, [=] {
if (self->IPCActive()) {
self->CheckResult(self->SendStopRequest(aStatusCode));
} else if (self->mState != State::Disconnecting) {
// If we're currently disconnecting, then we'll emit a stop
// request at the end of that process. Otherwise we need to
// manually emit one here, since we won't be getting a response
// from the child.
RunOnMainThread(FUNC, [=] {
if (!self->mSentStop) {
self->EmitStopRequest(aStatusCode);
}
});
}
});
return NS_OK;
}
nsresult StreamFilterParent::EmitStopRequest(nsresult aStatusCode) {
AssertIsMainThread();
MOZ_ASSERT(!mSentStop);
mSentStop = true;
nsresult rv = mOrigListener->OnStopRequest(mChannel, aStatusCode);
if (mLoadGroup && !mDisconnected) {
Unused << mLoadGroup->RemoveRequest(this, nullptr, aStatusCode);
}
return rv;
}
/*****************************************************************************
* Incoming data handling
*****************************************************************************/
void StreamFilterParent::DoSendData(Data&& aData) {
AssertIsActorThread();
if (mState == State::TransferringData) {
CheckResult(SendData(aData));
}
}
NS_IMETHODIMP
StreamFilterParent::OnDataAvailable(nsIRequest* aRequest,
nsIInputStream* aInputStream,
uint64_t aOffset, uint32_t aCount) {
AssertIsIOThread();
if (mDisconnectedByOnStartRequest || mState == State::Disconnected) {
// If we're offloading data in a thread pool, it's possible that we'll
// have buffered some additional data while waiting for the buffer to
// flush. So, if there's any buffered data left, flush that before we
// flush this incoming data.
//
// Note: When in the eDisconnected state, the buffer list is guaranteed
// never to be accessed by another thread during an OnDataAvailable call.
if (!mBufferedData.isEmpty()) {
FlushBufferedData();
}
mOffset += aCount;
return mOrigListener->OnDataAvailable(aRequest, aInputStream,
mOffset - aCount, aCount);
}
Data data;
data.SetLength(aCount);
uint32_t count;
nsresult rv = aInputStream->Read(reinterpret_cast<char*>(data.Elements()),
aCount, &count);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(count == aCount, NS_ERROR_UNEXPECTED);
if (mState == State::Disconnecting) {
MutexAutoLock al(mBufferMutex);
BufferData(std::move(data));
} else if (mState == State::Closed) {
return NS_ERROR_FAILURE;
} else {
ActorThread()->Dispatch(
NewRunnableMethod<Data&&>("StreamFilterParent::DoSendData", this,
&StreamFilterParent::DoSendData,
std::move(data)),
NS_DISPATCH_NORMAL);
}
return NS_OK;
}
nsresult StreamFilterParent::FlushBufferedData() {
AssertIsIOThread();
// When offloading data to a thread pool, OnDataAvailable isn't guaranteed
// to always run in the same thread, so it's possible for this function to
// run in parallel with OnDataAvailable.
MutexAutoLock al(mBufferMutex);
while (!mBufferedData.isEmpty()) {
UniquePtr<BufferedData> data(mBufferedData.popFirst());
nsresult rv = Write(data->mData);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
/*****************************************************************************
* Thread helpers
*****************************************************************************/
nsIEventTarget* StreamFilterParent::ActorThread() {
return net::gSocketTransportService;
}
bool StreamFilterParent::IsActorThread() {
return ActorThread()->IsOnCurrentThread();
}
void StreamFilterParent::AssertIsActorThread() { MOZ_ASSERT(IsActorThread()); }
nsISerialEventTarget* StreamFilterParent::IOThread() { return mIOThread; }
bool StreamFilterParent::IsIOThread() { return mIOThread->IsOnCurrentThread(); }
void StreamFilterParent::AssertIsIOThread() { MOZ_ASSERT(IsIOThread()); }
template <typename Function>
void StreamFilterParent::RunOnMainThread(const char* aName, Function&& aFunc) {
mQueue->RunOrEnqueue(new ChannelEventFunction(mMainThread, std::move(aFunc)));
}
void StreamFilterParent::RunOnMainThread(already_AddRefed<Runnable> aRunnable) {
mQueue->RunOrEnqueue(
new ChannelEventRunnable(mMainThread, std::move(aRunnable)));
}
template <typename Function>
void StreamFilterParent::RunOnIOThread(const char* aName, Function&& aFunc) {
mQueue->RunOrEnqueue(new ChannelEventFunction(mIOThread, std::move(aFunc)));
}
void StreamFilterParent::RunOnIOThread(already_AddRefed<Runnable> aRunnable) {
mQueue->RunOrEnqueue(
new ChannelEventRunnable(mIOThread, std::move(aRunnable)));
}
template <typename Function>
void StreamFilterParent::RunOnActorThread(const char* aName, Function&& aFunc) {
// We don't use mQueue for dispatch to the actor thread.
//
// The main thread and IO thread are used for dispatching events to the
// wrapped stream listener, and those events need to be processed
// consistently, in the order they were dispatched. An event dispatched to the
// main thread can't be run before events that were dispatched to the IO
// thread before it.
//
// Additionally, the IO thread is likely to be a thread pool, which means that
// without thread-safe queuing, it's possible for multiple events dispatched
// to it to be processed in parallel, or out of order.
//
// The actor thread, however, is always a serial event target. Its events are
// always processed in order, and events dispatched to the actor thread are
// independent of the events in the output event queue.
if (IsActorThread()) {
aFunc();
} else {
ActorThread()->Dispatch(std::move(NS_NewRunnableFunction(aName, aFunc)),
NS_DISPATCH_NORMAL);
}
}
/*****************************************************************************
* Glue
*****************************************************************************/
void StreamFilterParent::ActorDestroy(ActorDestroyReason aWhy) {
AssertIsActorThread();
if (mState != State::Disconnected && mState != State::Closed) {
Broken();
}
}
NS_INTERFACE_MAP_BEGIN(StreamFilterParent)
NS_INTERFACE_MAP_ENTRY(nsIStreamListener)
NS_INTERFACE_MAP_ENTRY(nsIRequestObserver)
NS_INTERFACE_MAP_ENTRY(nsIRequest)
NS_INTERFACE_MAP_ENTRY(nsIThreadRetargetableStreamListener)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStreamListener)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(StreamFilterParent)
NS_IMPL_RELEASE(StreamFilterParent)
} // namespace extensions
} // namespace mozilla