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https://github.com/mozilla/gecko-dev.git
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80377e90ee
Backed out changeset c79b90bae420 (bug 1552176) Backed out changeset 4b970cc771ca (bug 1552176) Backed out changeset de7aa0eaf4c8 (bug 1552176) Backed out changeset c8e692a40cd3 (bug 1552176) Backed out changeset 68882d1eccac (bug 1552176) Backed out changeset 692e5e51e19e (bug 1552176)
383 lines
11 KiB
C++
383 lines
11 KiB
C++
/* 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 "nsAsyncStreamCopier.h"
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#include "nsIOService.h"
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#include "nsIEventTarget.h"
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#include "nsStreamUtils.h"
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#include "nsThreadUtils.h"
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#include "nsNetUtil.h"
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#include "nsNetCID.h"
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#include "nsIBufferedStreams.h"
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#include "nsIRequestObserver.h"
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#include "mozilla/Logging.h"
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using namespace mozilla;
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using namespace mozilla::net;
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#undef LOG
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//
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// MOZ_LOG=nsStreamCopier:5
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//
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static LazyLogModule gStreamCopierLog("nsStreamCopier");
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#define LOG(args) MOZ_LOG(gStreamCopierLog, mozilla::LogLevel::Debug, args)
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/**
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* An event used to perform initialization off the main thread.
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*/
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class AsyncApplyBufferingPolicyEvent final : public Runnable {
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public:
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/**
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* @param aCopier
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* The nsAsyncStreamCopier requesting the information.
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*/
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explicit AsyncApplyBufferingPolicyEvent(nsAsyncStreamCopier* aCopier)
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: mozilla::Runnable("AsyncApplyBufferingPolicyEvent"),
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mCopier(aCopier),
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mTarget(GetCurrentThreadEventTarget()) {}
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NS_IMETHOD Run() override {
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nsresult rv = mCopier->ApplyBufferingPolicy();
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if (NS_FAILED(rv)) {
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mCopier->Cancel(rv);
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return NS_OK;
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}
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rv = mTarget->Dispatch(
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NewRunnableMethod("nsAsyncStreamCopier::AsyncCopyInternal", mCopier,
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&nsAsyncStreamCopier::AsyncCopyInternal),
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NS_DISPATCH_NORMAL);
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MOZ_ASSERT(NS_SUCCEEDED(rv));
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if (NS_FAILED(rv)) {
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mCopier->Cancel(rv);
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}
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return NS_OK;
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}
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private:
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RefPtr<nsAsyncStreamCopier> mCopier;
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nsCOMPtr<nsIEventTarget> mTarget;
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};
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//-----------------------------------------------------------------------------
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nsAsyncStreamCopier::nsAsyncStreamCopier()
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: mLock("nsAsyncStreamCopier.mLock"),
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mMode(NS_ASYNCCOPY_VIA_READSEGMENTS),
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mChunkSize(nsIOService::gDefaultSegmentSize),
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mStatus(NS_OK),
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mIsPending(false),
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mCloseSource{false},
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mCloseSink{false},
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mShouldSniffBuffering(false) {
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LOG(("Creating nsAsyncStreamCopier @%p\n", this));
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}
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nsAsyncStreamCopier::~nsAsyncStreamCopier() {
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LOG(("Destroying nsAsyncStreamCopier @%p\n", this));
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}
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bool nsAsyncStreamCopier::IsComplete(nsresult* status) {
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MutexAutoLock lock(mLock);
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if (status) *status = mStatus;
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return !mIsPending;
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}
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nsIRequest* nsAsyncStreamCopier::AsRequest() {
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return static_cast<nsIRequest*>(static_cast<nsIAsyncStreamCopier*>(this));
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}
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void nsAsyncStreamCopier::Complete(nsresult status) {
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LOG(("nsAsyncStreamCopier::Complete [this=%p status=%" PRIx32 "]\n", this,
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static_cast<uint32_t>(status)));
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nsCOMPtr<nsIRequestObserver> observer;
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nsCOMPtr<nsISupports> ctx;
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{
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MutexAutoLock lock(mLock);
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mCopierCtx = nullptr;
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if (mIsPending) {
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mIsPending = false;
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mStatus = status;
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// setup OnStopRequest callback and release references...
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observer = mObserver;
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mObserver = nullptr;
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}
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}
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if (observer) {
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LOG((" calling OnStopRequest [status=%" PRIx32 "]\n",
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static_cast<uint32_t>(status)));
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observer->OnStopRequest(AsRequest(), status);
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}
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}
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void nsAsyncStreamCopier::OnAsyncCopyComplete(void* closure, nsresult status) {
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// AddRef'd in AsyncCopy. Will be released at the end of the method.
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RefPtr<nsAsyncStreamCopier> self = dont_AddRef((nsAsyncStreamCopier*)closure);
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self->Complete(status);
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}
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//-----------------------------------------------------------------------------
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// nsISupports
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// We cannot use simply NS_IMPL_ISUPPORTSx as both
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// nsIAsyncStreamCopier and nsIAsyncStreamCopier2 implement nsIRequest
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NS_IMPL_ADDREF(nsAsyncStreamCopier)
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NS_IMPL_RELEASE(nsAsyncStreamCopier)
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NS_INTERFACE_TABLE_HEAD(nsAsyncStreamCopier)
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NS_INTERFACE_TABLE_BEGIN
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NS_INTERFACE_TABLE_ENTRY(nsAsyncStreamCopier, nsIAsyncStreamCopier)
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NS_INTERFACE_TABLE_ENTRY(nsAsyncStreamCopier, nsIAsyncStreamCopier2)
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NS_INTERFACE_TABLE_ENTRY_AMBIGUOUS(nsAsyncStreamCopier, nsIRequest,
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nsIAsyncStreamCopier)
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NS_INTERFACE_TABLE_ENTRY_AMBIGUOUS(nsAsyncStreamCopier, nsISupports,
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nsIAsyncStreamCopier)
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NS_INTERFACE_TABLE_END
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NS_INTERFACE_TABLE_TAIL
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//-----------------------------------------------------------------------------
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// nsIRequest
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NS_IMETHODIMP
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nsAsyncStreamCopier::GetName(nsACString& name) {
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name.Truncate();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::IsPending(bool* result) {
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*result = !IsComplete();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::GetStatus(nsresult* status) {
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IsComplete(status);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::Cancel(nsresult status) {
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nsCOMPtr<nsISupports> copierCtx;
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{
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MutexAutoLock lock(mLock);
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if (!mIsPending) return NS_OK;
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copierCtx.swap(mCopierCtx);
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}
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if (NS_SUCCEEDED(status)) {
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NS_WARNING("cancel with non-failure status code");
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status = NS_BASE_STREAM_CLOSED;
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}
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if (copierCtx) NS_CancelAsyncCopy(copierCtx, status);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::Suspend() {
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MOZ_ASSERT_UNREACHABLE("nsAsyncStreamCopier::Suspend");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::Resume() {
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MOZ_ASSERT_UNREACHABLE("nsAsyncStreamCopier::Resume");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::GetLoadFlags(nsLoadFlags* aLoadFlags) {
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*aLoadFlags = LOAD_NORMAL;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::SetLoadFlags(nsLoadFlags aLoadFlags) { return NS_OK; }
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NS_IMETHODIMP
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nsAsyncStreamCopier::GetLoadGroup(nsILoadGroup** aLoadGroup) {
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*aLoadGroup = nullptr;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAsyncStreamCopier::SetLoadGroup(nsILoadGroup* aLoadGroup) { return NS_OK; }
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nsresult nsAsyncStreamCopier::InitInternal(nsIInputStream* source,
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nsIOutputStream* sink,
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nsIEventTarget* target,
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uint32_t chunkSize, bool closeSource,
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bool closeSink) {
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NS_ASSERTION(!mSource && !mSink, "Init() called more than once");
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if (chunkSize == 0) {
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chunkSize = nsIOService::gDefaultSegmentSize;
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}
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mChunkSize = chunkSize;
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mSource = source;
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mSink = sink;
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mCloseSource = closeSource;
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mCloseSink = closeSink;
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if (target) {
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mTarget = target;
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} else {
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nsresult rv;
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mTarget = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsIAsyncStreamCopier
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NS_IMETHODIMP
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nsAsyncStreamCopier::Init(nsIInputStream* source, nsIOutputStream* sink,
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nsIEventTarget* target, bool sourceBuffered,
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bool sinkBuffered, uint32_t chunkSize,
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bool closeSource, bool closeSink) {
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NS_ASSERTION(sourceBuffered || sinkBuffered,
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"at least one stream must be buffered");
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mMode = sourceBuffered ? NS_ASYNCCOPY_VIA_READSEGMENTS
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: NS_ASYNCCOPY_VIA_WRITESEGMENTS;
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return InitInternal(source, sink, target, chunkSize, closeSource, closeSink);
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}
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//-----------------------------------------------------------------------------
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// nsIAsyncStreamCopier2
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NS_IMETHODIMP
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nsAsyncStreamCopier::Init(nsIInputStream* source, nsIOutputStream* sink,
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nsIEventTarget* target, uint32_t chunkSize,
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bool closeSource, bool closeSink) {
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mShouldSniffBuffering = true;
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return InitInternal(source, sink, target, chunkSize, closeSource, closeSink);
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}
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/**
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* Detect whether the input or the output stream is buffered,
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* bufferize one of them if neither is buffered.
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*/
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nsresult nsAsyncStreamCopier::ApplyBufferingPolicy() {
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// This function causes I/O, it must not be executed on the main
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// thread.
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MOZ_ASSERT(!NS_IsMainThread());
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if (NS_OutputStreamIsBuffered(mSink)) {
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// Sink is buffered, no need to perform additional buffering
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mMode = NS_ASYNCCOPY_VIA_WRITESEGMENTS;
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return NS_OK;
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}
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if (NS_InputStreamIsBuffered(mSource)) {
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// Source is buffered, no need to perform additional buffering
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mMode = NS_ASYNCCOPY_VIA_READSEGMENTS;
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return NS_OK;
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}
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// No buffering, let's buffer the sink
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nsresult rv;
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nsCOMPtr<nsIBufferedOutputStream> sink =
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do_CreateInstance(NS_BUFFEREDOUTPUTSTREAM_CONTRACTID, &rv);
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if (NS_FAILED(rv)) {
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return rv;
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}
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rv = sink->Init(mSink, mChunkSize);
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if (NS_FAILED(rv)) {
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return rv;
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}
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mMode = NS_ASYNCCOPY_VIA_WRITESEGMENTS;
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mSink = sink;
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// Both nsIAsyncStreamCopier and nsIAsyncStreamCopier2
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NS_IMETHODIMP
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nsAsyncStreamCopier::AsyncCopy(nsIRequestObserver* observer, nsISupports* ctx) {
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LOG(("nsAsyncStreamCopier::AsyncCopy [this=%p observer=%p]\n", this,
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observer));
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NS_ASSERTION(mSource && mSink, "not initialized");
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nsresult rv;
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if (observer) {
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// build proxy for observer events
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rv = NS_NewRequestObserverProxy(getter_AddRefs(mObserver), observer, ctx);
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if (NS_FAILED(rv)) return rv;
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}
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// from this point forward, AsyncCopy is going to return NS_OK. any errors
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// will be reported via OnStopRequest.
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mIsPending = true;
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if (mObserver) {
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rv = mObserver->OnStartRequest(AsRequest());
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if (NS_FAILED(rv)) Cancel(rv);
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}
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if (!mShouldSniffBuffering) {
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// No buffer sniffing required, let's proceed
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AsyncCopyInternal();
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return NS_OK;
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}
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if (NS_IsMainThread()) {
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// Don't perform buffer sniffing on the main thread
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nsCOMPtr<nsIRunnable> event = new AsyncApplyBufferingPolicyEvent(this);
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rv = mTarget->Dispatch(event, NS_DISPATCH_NORMAL);
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if (NS_FAILED(rv)) {
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Cancel(rv);
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}
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return NS_OK;
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}
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// We're not going to block the main thread, so let's sniff here
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rv = ApplyBufferingPolicy();
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if (NS_FAILED(rv)) {
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Cancel(rv);
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}
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AsyncCopyInternal();
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return NS_OK;
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}
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// Launch async copy.
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// All errors are reported through the observer.
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void nsAsyncStreamCopier::AsyncCopyInternal() {
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MOZ_ASSERT(mMode == NS_ASYNCCOPY_VIA_READSEGMENTS ||
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mMode == NS_ASYNCCOPY_VIA_WRITESEGMENTS);
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nsresult rv;
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// We want to receive progress notifications; release happens in
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// OnAsyncCopyComplete.
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RefPtr<nsAsyncStreamCopier> self = this;
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{
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MutexAutoLock lock(mLock);
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rv = NS_AsyncCopy(mSource, mSink, mTarget, mMode, mChunkSize,
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OnAsyncCopyComplete, this, mCloseSource, mCloseSink,
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getter_AddRefs(mCopierCtx));
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}
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if (NS_FAILED(rv)) {
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Cancel(rv);
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return; // release self
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}
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Unused << self.forget(); // Will be released in OnAsyncCopyComplete
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}
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