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gecko-dev
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gecko-dev/netwerk/base/nsStreamTransportService.cpp

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/* 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsStreamTransportService.h"
#include "nsXPCOMCIDInternal.h"
#include "nsNetSegmentUtils.h"
#include "nsTransportUtils.h"
#include "nsStreamUtils.h"
#include "nsError.h"
#include "nsNetCID.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsISeekableStream.h"
#include "nsIPipe.h"
#include "nsITransport.h"
#include "nsIObserverService.h"
#include "nsIThreadPool.h"
#include "mozilla/Services.h"
namespace mozilla {
namespace net {
//-----------------------------------------------------------------------------
// nsInputStreamTransport
//
// Implements nsIInputStream as a wrapper around the real input stream. This
// allows the transport to support seeking, range-limiting, progress reporting,
// and close-when-done semantics while utilizing NS_AsyncCopy.
//-----------------------------------------------------------------------------
class nsInputStreamTransport : public nsITransport
, public nsIInputStream
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSITRANSPORT
NS_DECL_NSIINPUTSTREAM
nsInputStreamTransport(nsIInputStream *source,
uint64_t offset,
uint64_t limit,
bool closeWhenDone)
: mSource(source)
, mOffset(offset)
, mLimit(limit)
, mCloseWhenDone(closeWhenDone)
, mFirstTime(true)
, mInProgress(false)
{
}
private:
virtual ~nsInputStreamTransport()
{
}
nsCOMPtr<nsIAsyncInputStream> mPipeIn;
// while the copy is active, these members may only be accessed from the
// nsIInputStream implementation.
nsCOMPtr<nsITransportEventSink> mEventSink;
nsCOMPtr<nsIInputStream> mSource;
int64_t mOffset;
int64_t mLimit;
bool mCloseWhenDone;
bool mFirstTime;
// this variable serves as a lock to prevent the state of the transport
// from being modified once the copy is in progress.
bool mInProgress;
};
NS_IMPL_ISUPPORTS(nsInputStreamTransport,
nsITransport,
nsIInputStream)
/** nsITransport **/
NS_IMETHODIMP
nsInputStreamTransport::OpenInputStream(uint32_t flags,
uint32_t segsize,
uint32_t segcount,
nsIInputStream **result)
{
NS_ENSURE_TRUE(!mInProgress, NS_ERROR_IN_PROGRESS);
nsresult rv;
nsCOMPtr<nsIEventTarget> target =
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
// XXX if the caller requests an unbuffered stream, then perhaps
// we'd want to simply return mSource; however, then we would
// not be reading mSource on a background thread. is this ok?
bool nonblocking = !(flags & OPEN_BLOCKING);
net_ResolveSegmentParams(segsize, segcount);
nsCOMPtr<nsIAsyncOutputStream> pipeOut;
rv = NS_NewPipe2(getter_AddRefs(mPipeIn),
getter_AddRefs(pipeOut),
nonblocking, true,
segsize, segcount);
if (NS_FAILED(rv)) return rv;
mInProgress = true;
// startup async copy process...
rv = NS_AsyncCopy(this, pipeOut, target,
NS_ASYNCCOPY_VIA_WRITESEGMENTS, segsize);
if (NS_SUCCEEDED(rv))
NS_ADDREF(*result = mPipeIn);
return rv;
}
NS_IMETHODIMP
nsInputStreamTransport::OpenOutputStream(uint32_t flags,
uint32_t segsize,
uint32_t segcount,
nsIOutputStream **result)
{
// this transport only supports reading!
NS_NOTREACHED("nsInputStreamTransport::OpenOutputStream");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsInputStreamTransport::Close(nsresult reason)
{
if (NS_SUCCEEDED(reason))
reason = NS_BASE_STREAM_CLOSED;
return mPipeIn->CloseWithStatus(reason);
}
NS_IMETHODIMP
nsInputStreamTransport::SetEventSink(nsITransportEventSink *sink,
nsIEventTarget *target)
{
NS_ENSURE_TRUE(!mInProgress, NS_ERROR_IN_PROGRESS);
if (target)
return net_NewTransportEventSinkProxy(getter_AddRefs(mEventSink),
sink, target);
mEventSink = sink;
return NS_OK;
}
/** nsIInputStream **/
NS_IMETHODIMP
nsInputStreamTransport::Close()
{
if (mCloseWhenDone)
mSource->Close();
// make additional reads return early...
mOffset = mLimit = 0;
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamTransport::Available(uint64_t *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsInputStreamTransport::Read(char *buf, uint32_t count, uint32_t *result)
{
if (mFirstTime) {
mFirstTime = false;
if (mOffset != 0) {
// read from current position if offset equal to max
if (mOffset != -1) {
nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mSource);
if (seekable)
seekable->Seek(nsISeekableStream::NS_SEEK_SET, mOffset);
}
// reset offset to zero so we can use it to enforce limit
mOffset = 0;
}
}
// limit amount read
uint64_t max = count;
if (mLimit != -1) {
max = mLimit - mOffset;
if (max == 0) {
*result = 0;
return NS_OK;
}
}
if (count > max)
count = static_cast<uint32_t>(max);
nsresult rv = mSource->Read(buf, count, result);
if (NS_SUCCEEDED(rv)) {
mOffset += *result;
if (mEventSink)
mEventSink->OnTransportStatus(this, NS_NET_STATUS_READING, mOffset,
mLimit);
}
return rv;
}
NS_IMETHODIMP
nsInputStreamTransport::ReadSegments(nsWriteSegmentFun writer, void *closure,
uint32_t count, uint32_t *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsInputStreamTransport::IsNonBlocking(bool *result)
{
*result = false;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsOutputStreamTransport
//
// Implements nsIOutputStream as a wrapper around the real input stream. This
// allows the transport to support seeking, range-limiting, progress reporting,
// and close-when-done semantics while utilizing NS_AsyncCopy.
//-----------------------------------------------------------------------------
class nsOutputStreamTransport : public nsITransport
, public nsIOutputStream
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSITRANSPORT
NS_DECL_NSIOUTPUTSTREAM
nsOutputStreamTransport(nsIOutputStream *sink,
int64_t offset,
int64_t limit,
bool closeWhenDone)
: mSink(sink)
, mOffset(offset)
, mLimit(limit)
, mCloseWhenDone(closeWhenDone)
, mFirstTime(true)
, mInProgress(false)
{
}
private:
virtual ~nsOutputStreamTransport()
{
}
nsCOMPtr<nsIAsyncOutputStream> mPipeOut;
// while the copy is active, these members may only be accessed from the
// nsIOutputStream implementation.
nsCOMPtr<nsITransportEventSink> mEventSink;
nsCOMPtr<nsIOutputStream> mSink;
int64_t mOffset;
int64_t mLimit;
bool mCloseWhenDone;
bool mFirstTime;
// this variable serves as a lock to prevent the state of the transport
// from being modified once the copy is in progress.
bool mInProgress;
};
NS_IMPL_ISUPPORTS(nsOutputStreamTransport,
nsITransport,
nsIOutputStream)
/** nsITransport **/
NS_IMETHODIMP
nsOutputStreamTransport::OpenInputStream(uint32_t flags,
uint32_t segsize,
uint32_t segcount,
nsIInputStream **result)
{
// this transport only supports writing!
NS_NOTREACHED("nsOutputStreamTransport::OpenInputStream");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsOutputStreamTransport::OpenOutputStream(uint32_t flags,
uint32_t segsize,
uint32_t segcount,
nsIOutputStream **result)
{
NS_ENSURE_TRUE(!mInProgress, NS_ERROR_IN_PROGRESS);
nsresult rv;
nsCOMPtr<nsIEventTarget> target =
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
// XXX if the caller requests an unbuffered stream, then perhaps
// we'd want to simply return mSink; however, then we would
// not be writing to mSink on a background thread. is this ok?
bool nonblocking = !(flags & OPEN_BLOCKING);
net_ResolveSegmentParams(segsize, segcount);
nsCOMPtr<nsIAsyncInputStream> pipeIn;
rv = NS_NewPipe2(getter_AddRefs(pipeIn),
getter_AddRefs(mPipeOut),
true, nonblocking,
segsize, segcount);
if (NS_FAILED(rv)) return rv;
mInProgress = true;
// startup async copy process...
rv = NS_AsyncCopy(pipeIn, this, target,
NS_ASYNCCOPY_VIA_READSEGMENTS, segsize);
if (NS_SUCCEEDED(rv))
NS_ADDREF(*result = mPipeOut);
return rv;
}
NS_IMETHODIMP
nsOutputStreamTransport::Close(nsresult reason)
{
if (NS_SUCCEEDED(reason))
reason = NS_BASE_STREAM_CLOSED;
return mPipeOut->CloseWithStatus(reason);
}
NS_IMETHODIMP
nsOutputStreamTransport::SetEventSink(nsITransportEventSink *sink,
nsIEventTarget *target)
{
NS_ENSURE_TRUE(!mInProgress, NS_ERROR_IN_PROGRESS);
if (target)
return net_NewTransportEventSinkProxy(getter_AddRefs(mEventSink),
sink, target);
mEventSink = sink;
return NS_OK;
}
/** nsIOutputStream **/
NS_IMETHODIMP
nsOutputStreamTransport::Close()
{
if (mCloseWhenDone)
mSink->Close();
// make additional writes return early...
mOffset = mLimit = 0;
return NS_OK;
}
NS_IMETHODIMP
nsOutputStreamTransport::Flush()
{
return NS_OK;
}
NS_IMETHODIMP
nsOutputStreamTransport::Write(const char *buf, uint32_t count, uint32_t *result)
{
if (mFirstTime) {
mFirstTime = false;
if (mOffset != 0) {
// write to current position if offset equal to max
if (mOffset != -1) {
nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mSink);
if (seekable)
seekable->Seek(nsISeekableStream::NS_SEEK_SET, mOffset);
}
// reset offset to zero so we can use it to enforce limit
mOffset = 0;
}
}
// limit amount written
uint64_t max = count;
if (mLimit != -1) {
max = mLimit - mOffset;
if (max == 0) {
*result = 0;
return NS_OK;
}
}
if (count > max)
count = static_cast<uint32_t>(max);
nsresult rv = mSink->Write(buf, count, result);
if (NS_SUCCEEDED(rv)) {
mOffset += *result;
if (mEventSink)
mEventSink->OnTransportStatus(this, NS_NET_STATUS_WRITING, mOffset,
mLimit);
}
return rv;
}
NS_IMETHODIMP
nsOutputStreamTransport::WriteSegments(nsReadSegmentFun reader, void *closure,
uint32_t count, uint32_t *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsOutputStreamTransport::WriteFrom(nsIInputStream *in, uint32_t count, uint32_t *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsOutputStreamTransport::IsNonBlocking(bool *result)
{
*result = false;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsStreamTransportService
//-----------------------------------------------------------------------------
nsStreamTransportService::~nsStreamTransportService()
{
NS_ASSERTION(!mPool, "thread pool wasn't shutdown");
}
nsresult
nsStreamTransportService::Init()
{
mPool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
NS_ENSURE_STATE(mPool);
// Configure the pool
mPool->SetName(NS_LITERAL_CSTRING("StreamTrans"));
mPool->SetThreadLimit(25);
mPool->SetIdleThreadLimit(1);
mPool->SetIdleThreadTimeout(PR_SecondsToInterval(30));
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
if (obsSvc)
obsSvc->AddObserver(this, "xpcom-shutdown-threads", false);
return NS_OK;
}
NS_IMPL_ISUPPORTS(nsStreamTransportService,
nsIStreamTransportService,
nsIEventTarget,
nsIObserver)
NS_IMETHODIMP
nsStreamTransportService::DispatchFromScript(nsIRunnable *task, uint32_t flags)
{
nsCOMPtr<nsIRunnable> event(task);
return Dispatch(event.forget(), flags);
}
NS_IMETHODIMP
nsStreamTransportService::Dispatch(already_AddRefed<nsIRunnable> task, uint32_t flags)
{
nsCOMPtr<nsIRunnable> event(task); // so it gets released on failure paths
nsCOMPtr<nsIThreadPool> pool;
{
mozilla::MutexAutoLock lock(mShutdownLock);
if (mIsShutdown) {
return NS_ERROR_NOT_INITIALIZED;
}
pool = mPool;
}
NS_ENSURE_TRUE(pool, NS_ERROR_NOT_INITIALIZED);
return pool->Dispatch(event.forget(), flags);
}
NS_IMETHODIMP
nsStreamTransportService::DelayedDispatch(already_AddRefed<nsIRunnable>, uint32_t)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsStreamTransportService::IsOnCurrentThread(bool *result)
{
nsCOMPtr<nsIThreadPool> pool;
{
mozilla::MutexAutoLock lock(mShutdownLock);
if (mIsShutdown) {
return NS_ERROR_NOT_INITIALIZED;
}
pool = mPool;
}
NS_ENSURE_TRUE(pool, NS_ERROR_NOT_INITIALIZED);
return pool->IsOnCurrentThread(result);
}
NS_IMETHODIMP
nsStreamTransportService::CreateInputTransport(nsIInputStream *stream,
int64_t offset,
int64_t limit,
bool closeWhenDone,
nsITransport **result)
{
nsInputStreamTransport *trans =
new nsInputStreamTransport(stream, offset, limit, closeWhenDone);
if (!trans)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = trans);
return NS_OK;
}
NS_IMETHODIMP
nsStreamTransportService::CreateOutputTransport(nsIOutputStream *stream,
int64_t offset,
int64_t limit,
bool closeWhenDone,
nsITransport **result)
{
nsOutputStreamTransport *trans =
new nsOutputStreamTransport(stream, offset, limit, closeWhenDone);
if (!trans)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = trans);
return NS_OK;
}
NS_IMETHODIMP
nsStreamTransportService::Observe(nsISupports *subject, const char *topic,
const char16_t *data)
{
NS_ASSERTION(strcmp(topic, "xpcom-shutdown-threads") == 0, "oops");
{
mozilla::MutexAutoLock lock(mShutdownLock);
mIsShutdown = true;
}
if (mPool) {
mPool->Shutdown();
mPool = nullptr;
}
return NS_OK;
}
} // namespace net
} // namespace mozilla
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