mirror of
https://github.com/mozilla/gecko-dev.git
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30984f7bab
Differential Revision: https://phabricator.services.mozilla.com/D62543 --HG-- extra : moz-landing-system : lando
334 lines
9.2 KiB
C++
334 lines
9.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 <stdlib.h>
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#include "mozilla/Logging.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/Attributes.h"
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#include "nsIInputStreamTee.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsCOMPtr.h"
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#include "nsIEventTarget.h"
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#include "nsThreadUtils.h"
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using namespace mozilla;
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#ifdef LOG
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# undef LOG
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#endif
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static LazyLogModule sTeeLog("nsInputStreamTee");
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#define LOG(args) MOZ_LOG(sTeeLog, mozilla::LogLevel::Debug, args)
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class nsInputStreamTee final : public nsIInputStreamTee {
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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_NSIINPUTSTREAMTEE
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nsInputStreamTee();
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bool SinkIsValid();
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void InvalidateSink();
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private:
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~nsInputStreamTee() = default;
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nsresult TeeSegment(const char* aBuf, uint32_t aCount);
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static nsresult WriteSegmentFun(nsIInputStream*, void*, const char*, uint32_t,
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uint32_t, uint32_t*);
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private:
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nsCOMPtr<nsIInputStream> mSource;
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nsCOMPtr<nsIOutputStream> mSink;
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nsCOMPtr<nsIEventTarget> mEventTarget;
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nsWriteSegmentFun mWriter; // for implementing ReadSegments
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void* mClosure; // for implementing ReadSegments
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Maybe<Mutex> mLock; // synchronize access to mSinkIsValid
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bool mSinkIsValid; // False if TeeWriteEvent fails
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};
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class nsInputStreamTeeWriteEvent : public Runnable {
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public:
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// aTee's lock is held across construction of this object
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nsInputStreamTeeWriteEvent(const char* aBuf, uint32_t aCount,
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nsIOutputStream* aSink, nsInputStreamTee* aTee)
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: mozilla::Runnable("nsInputStreamTeeWriteEvent") {
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// copy the buffer - will be free'd by dtor
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mBuf = (char*)malloc(aCount);
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if (mBuf) {
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memcpy(mBuf, (char*)aBuf, aCount);
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}
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mCount = aCount;
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mSink = aSink;
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bool isNonBlocking;
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mSink->IsNonBlocking(&isNonBlocking);
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NS_ASSERTION(isNonBlocking == false, "mSink is nonblocking");
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mTee = aTee;
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}
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NS_IMETHOD Run() override {
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if (!mBuf) {
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NS_WARNING(
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"nsInputStreamTeeWriteEvent::Run() "
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"memory not allocated\n");
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return NS_OK;
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}
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MOZ_ASSERT(mSink, "mSink is null!");
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// The output stream could have been invalidated between when
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// this event was dispatched and now, so check before writing.
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if (!mTee->SinkIsValid()) {
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return NS_OK;
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}
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LOG(
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("nsInputStreamTeeWriteEvent::Run() [%p]"
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"will write %u bytes to %p\n",
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this, mCount, mSink.get()));
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uint32_t totalBytesWritten = 0;
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while (mCount) {
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nsresult rv;
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uint32_t bytesWritten = 0;
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rv = mSink->Write(mBuf + totalBytesWritten, mCount, &bytesWritten);
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if (NS_FAILED(rv)) {
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LOG(("nsInputStreamTeeWriteEvent::Run[%p] error %" PRIx32 " in writing",
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this, static_cast<uint32_t>(rv)));
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mTee->InvalidateSink();
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break;
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}
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totalBytesWritten += bytesWritten;
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NS_ASSERTION(bytesWritten <= mCount, "wrote too much");
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mCount -= bytesWritten;
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}
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return NS_OK;
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}
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protected:
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virtual ~nsInputStreamTeeWriteEvent() {
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if (mBuf) {
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free(mBuf);
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}
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mBuf = nullptr;
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}
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private:
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char* mBuf;
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uint32_t mCount;
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nsCOMPtr<nsIOutputStream> mSink;
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// back pointer to the tee that created this runnable
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RefPtr<nsInputStreamTee> mTee;
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};
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nsInputStreamTee::nsInputStreamTee()
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: mWriter(nullptr), mClosure(nullptr), mLock(), mSinkIsValid(true) {}
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bool nsInputStreamTee::SinkIsValid() {
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MutexAutoLock lock(*mLock);
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return mSinkIsValid;
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}
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void nsInputStreamTee::InvalidateSink() {
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MutexAutoLock lock(*mLock);
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mSinkIsValid = false;
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}
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nsresult nsInputStreamTee::TeeSegment(const char* aBuf, uint32_t aCount) {
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if (!mSink) {
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return NS_OK; // nothing to do
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}
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if (mLock) { // asynchronous case
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NS_ASSERTION(mEventTarget, "mEventTarget is null, mLock is not null.");
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if (!SinkIsValid()) {
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return NS_OK; // nothing to do
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}
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nsCOMPtr<nsIRunnable> event =
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new nsInputStreamTeeWriteEvent(aBuf, aCount, mSink, this);
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LOG(("nsInputStreamTee::TeeSegment [%p] dispatching write %u bytes\n", this,
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aCount));
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return mEventTarget->Dispatch(event, NS_DISPATCH_NORMAL);
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} else { // synchronous case
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NS_ASSERTION(!mEventTarget, "mEventTarget is not null, mLock is null.");
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nsresult rv;
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uint32_t totalBytesWritten = 0;
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while (aCount) {
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uint32_t bytesWritten = 0;
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rv = mSink->Write(aBuf + totalBytesWritten, aCount, &bytesWritten);
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if (NS_FAILED(rv)) {
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// ok, this is not a fatal error... just drop our reference to mSink
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// and continue on as if nothing happened.
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NS_WARNING("Write failed (non-fatal)");
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// catch possible misuse of the input stream tee
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NS_ASSERTION(rv != NS_BASE_STREAM_WOULD_BLOCK,
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"sink must be a blocking stream");
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mSink = nullptr;
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break;
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}
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totalBytesWritten += bytesWritten;
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NS_ASSERTION(bytesWritten <= aCount, "wrote too much");
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aCount -= bytesWritten;
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}
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return NS_OK;
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}
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}
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nsresult nsInputStreamTee::WriteSegmentFun(nsIInputStream* aIn, void* aClosure,
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const char* aFromSegment,
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uint32_t aOffset, uint32_t aCount,
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uint32_t* aWriteCount) {
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nsInputStreamTee* tee = reinterpret_cast<nsInputStreamTee*>(aClosure);
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nsresult rv = tee->mWriter(aIn, tee->mClosure, aFromSegment, aOffset, aCount,
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aWriteCount);
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if (NS_FAILED(rv) || (*aWriteCount == 0)) {
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NS_ASSERTION((NS_FAILED(rv) ? (*aWriteCount == 0) : true),
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"writer returned an error with non-zero writeCount");
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return rv;
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}
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return tee->TeeSegment(aFromSegment, *aWriteCount);
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}
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NS_IMPL_ISUPPORTS(nsInputStreamTee, nsIInputStreamTee, nsIInputStream)
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NS_IMETHODIMP
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nsInputStreamTee::Close() {
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if (NS_WARN_IF(!mSource)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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nsresult rv = mSource->Close();
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mSource = nullptr;
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mSink = nullptr;
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return rv;
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}
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NS_IMETHODIMP
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nsInputStreamTee::Available(uint64_t* aAvail) {
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if (NS_WARN_IF(!mSource)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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return mSource->Available(aAvail);
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}
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NS_IMETHODIMP
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nsInputStreamTee::Read(char* aBuf, uint32_t aCount, uint32_t* aBytesRead) {
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if (NS_WARN_IF(!mSource)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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nsresult rv = mSource->Read(aBuf, aCount, aBytesRead);
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if (NS_FAILED(rv) || (*aBytesRead == 0)) {
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return rv;
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}
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return TeeSegment(aBuf, *aBytesRead);
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}
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NS_IMETHODIMP
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nsInputStreamTee::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
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uint32_t aCount, uint32_t* aBytesRead) {
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if (NS_WARN_IF(!mSource)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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mWriter = aWriter;
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mClosure = aClosure;
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return mSource->ReadSegments(WriteSegmentFun, this, aCount, aBytesRead);
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}
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NS_IMETHODIMP
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nsInputStreamTee::IsNonBlocking(bool* aResult) {
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if (NS_WARN_IF(!mSource)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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return mSource->IsNonBlocking(aResult);
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}
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NS_IMETHODIMP
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nsInputStreamTee::SetSource(nsIInputStream* aSource) {
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mSource = aSource;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::GetSource(nsIInputStream** aSource) {
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NS_IF_ADDREF(*aSource = mSource);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::SetSink(nsIOutputStream* aSink) {
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#ifdef DEBUG
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if (aSink) {
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bool nonBlocking;
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nsresult rv = aSink->IsNonBlocking(&nonBlocking);
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if (NS_FAILED(rv) || nonBlocking) {
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NS_ERROR("aSink should be a blocking stream");
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}
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}
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#endif
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mSink = aSink;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::GetSink(nsIOutputStream** aSink) {
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NS_IF_ADDREF(*aSink = mSink);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::SetEventTarget(nsIEventTarget* aEventTarget) {
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mEventTarget = aEventTarget;
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if (mEventTarget) {
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// Only need synchronization if this is an async tee
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mLock.emplace("nsInputStreamTee.mLock");
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsInputStreamTee::GetEventTarget(nsIEventTarget** aEventTarget) {
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NS_IF_ADDREF(*aEventTarget = mEventTarget);
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return NS_OK;
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}
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nsresult NS_NewInputStreamTeeAsync(nsIInputStream** aResult,
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nsIInputStream* aSource,
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nsIOutputStream* aSink,
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nsIEventTarget* aEventTarget) {
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nsresult rv;
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nsCOMPtr<nsIInputStreamTee> tee = new nsInputStreamTee();
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rv = tee->SetSource(aSource);
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = tee->SetSink(aSink);
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = tee->SetEventTarget(aEventTarget);
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if (NS_FAILED(rv)) {
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return rv;
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}
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tee.forget(aResult);
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return rv;
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}
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nsresult NS_NewInputStreamTee(nsIInputStream** aResult, nsIInputStream* aSource,
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nsIOutputStream* aSink) {
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return NS_NewInputStreamTeeAsync(aResult, aSource, aSink, nullptr);
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}
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#undef LOG
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