136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ipc/SendStream.h"
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#include "mozilla/Unused.h"
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#include "nsIAsyncInputStream.h"
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#include "nsIAsyncOutputStream.h"
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#include "nsIPipe.h"
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namespace mozilla {
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namespace ipc {
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namespace {
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class SendStreamParentImpl final : public SendStreamParent
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{
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public:
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SendStreamParentImpl(nsIAsyncInputStream* aReader,
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nsIAsyncOutputStream* aWriter);
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~SendStreamParentImpl();
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private:
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// PSendStreamParentImpl methods
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virtual void
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ActorDestroy(ActorDestroyReason aReason) override;
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// SendStreamparent methods
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already_AddRefed<nsIInputStream>
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TakeReader() override;
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virtual bool
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RecvBuffer(const nsCString& aBuffer) override;
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virtual bool
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RecvClose(const nsresult& aRv) override;
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nsCOMPtr<nsIAsyncInputStream> mReader;
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nsCOMPtr<nsIAsyncOutputStream> mWriter;
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NS_DECL_OWNINGTHREAD
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};
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SendStreamParentImpl::~SendStreamParentImpl()
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{
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}
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already_AddRefed<nsIInputStream>
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SendStreamParentImpl::TakeReader()
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{
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MOZ_ASSERT(mReader);
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return mReader.forget();
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}
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void
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SendStreamParentImpl::ActorDestroy(ActorDestroyReason aReason)
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{
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// If we were gracefully closed we should have gotten RecvClose(). In
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// that case, the writer will already be closed and this will have no
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// effect. This just aborts the writer in the case where the child process
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// crashes.
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mWriter->CloseWithStatus(NS_ERROR_ABORT);
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}
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bool
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SendStreamParentImpl::RecvBuffer(const nsCString& aBuffer)
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{
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uint32_t numWritten = 0;
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// This should only fail if we hit an OOM condition.
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nsresult rv = mWriter->Write(aBuffer.get(), aBuffer.Length(), &numWritten);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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Unused << SendRequestClose(rv);
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}
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return true;
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}
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bool
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SendStreamParentImpl::RecvClose(const nsresult& aRv)
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{
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mWriter->CloseWithStatus(aRv);
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Unused << Send__delete__(this);
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return true;
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}
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SendStreamParentImpl::SendStreamParentImpl(nsIAsyncInputStream* aReader,
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nsIAsyncOutputStream* aWriter)
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: mReader(aReader)
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, mWriter(aWriter)
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{
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MOZ_ASSERT(mReader);
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MOZ_ASSERT(mWriter);
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}
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} // anonymous namespace
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SendStreamParent::~SendStreamParent()
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{
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}
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PSendStreamParent*
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AllocPSendStreamParent()
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{
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// use async versions for both reader and writer even though we are
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// opening the writer as an infinite stream. We want to be able to
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// use CloseWithStatus() to communicate errors through the pipe.
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nsCOMPtr<nsIAsyncInputStream> reader;
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nsCOMPtr<nsIAsyncOutputStream> writer;
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// Use an "infinite" pipe because we cannot apply back-pressure through
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// the async IPC layer at the moment. Blocking the IPC worker thread
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// is not desirable, either.
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nsresult rv = NS_NewPipe2(getter_AddRefs(reader),
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getter_AddRefs(writer),
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true, true, // non-blocking
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0, // segment size
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UINT32_MAX); // "infinite" pipe
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return nullptr;
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}
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return new SendStreamParentImpl(reader, writer);
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}
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void
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DeallocPSendStreamParent(PSendStreamParent* aActor)
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{
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delete aActor;
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}
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} // namespace ipc
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} // namespace mozilla
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