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The total size of an IPC inputStream message must be less than 1mb. When we compose the message for the multiplex stream, each sub stream collaborates with its own size, deciding if it's better to be a pipe stream (IPCRemoteStream) or a full serialized one. Differential Revision: https://phabricator.services.mozilla.com/D18543 --HG-- extra : moz-landing-system : lando
91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; 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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#ifndef NonBlockingAsyncInputStream_h
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#define NonBlockingAsyncInputStream_h
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#include "mozilla/Attributes.h"
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#include "mozilla/Maybe.h"
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#include "nsCOMPtr.h"
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#include "nsIAsyncInputStream.h"
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#include "nsICloneableInputStream.h"
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#include "nsIIPCSerializableInputStream.h"
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#include "nsISeekableStream.h"
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// This class aims to wrap a non-blocking and non-async inputStream and expose
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// it as nsIAsyncInputStream.
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// Probably you don't want to use this class directly. Instead use
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// NS_MakeAsyncNonBlockingInputStream() as it will handle different stream
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// variants without requiring you to special-case them yourself.
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namespace mozilla {
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class NonBlockingAsyncInputStream final : public nsIAsyncInputStream,
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public nsICloneableInputStream,
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public nsIIPCSerializableInputStream,
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public nsISeekableStream {
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSIASYNCINPUTSTREAM
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NS_DECL_NSICLONEABLEINPUTSTREAM
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSITELLABLESTREAM
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// |aInputStream| must be a non-blocking, non-async inputSteam.
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static nsresult Create(already_AddRefed<nsIInputStream> aInputStream,
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nsIAsyncInputStream** aAsyncInputStream);
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private:
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explicit NonBlockingAsyncInputStream(
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already_AddRefed<nsIInputStream> aInputStream);
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~NonBlockingAsyncInputStream();
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template <typename M>
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void SerializeInternal(mozilla::ipc::InputStreamParams& aParams,
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FileDescriptorArray& aFileDescriptors,
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bool aDelayedStart, uint32_t aMaxSize,
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uint32_t* aSizeUsed, M* aManager);
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class AsyncWaitRunnable;
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void RunAsyncWaitCallback(AsyncWaitRunnable* aRunnable,
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already_AddRefed<nsIInputStreamCallback> aCallback);
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nsCOMPtr<nsIInputStream> mInputStream;
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// Raw pointers because these are just QI of mInputStream.
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nsICloneableInputStream* MOZ_NON_OWNING_REF mWeakCloneableInputStream;
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nsIIPCSerializableInputStream* MOZ_NON_OWNING_REF
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mWeakIPCSerializableInputStream;
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nsISeekableStream* MOZ_NON_OWNING_REF mWeakSeekableInputStream;
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nsITellableStream* MOZ_NON_OWNING_REF mWeakTellableInputStream;
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Mutex mLock;
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struct WaitClosureOnly {
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WaitClosureOnly(AsyncWaitRunnable* aRunnable, nsIEventTarget* aEventTarget);
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RefPtr<AsyncWaitRunnable> mRunnable;
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nsCOMPtr<nsIEventTarget> mEventTarget;
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};
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// This is set when AsyncWait is called with a callback and with
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// WAIT_CLOSURE_ONLY as flag.
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// This is protected by mLock.
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Maybe<WaitClosureOnly> mWaitClosureOnly;
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// This is protected by mLock.
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RefPtr<AsyncWaitRunnable> mAsyncWaitCallback;
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// This is protected by mLock.
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bool mClosed;
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};
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} // namespace mozilla
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#endif // NonBlockingAsyncInputStream_h
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