NS_IMETHODIMP
nsInputStreamPump::Cancel(nsresult status)
{
LOG(("nsInputStreamPump::Cancel [this=%x status=%x]\n",
this, status));
if (NS_FAILED(mStatus)) {
LOG((" already canceled\n"));
return NS_OK;
}
NS_ASSERTION(NS_FAILED(status), "cancel with non-failure status code");
mStatus = status;
// close input stream
if (mAsyncStream) {
mAsyncStream->CloseWithStatus(status);
if (mSuspendCount == 0)
EnsureWaiting();
// Otherwise, EnsureWaiting will be called by Resume().
// Note that while suspended, OnInputStreamReady will
// not do anything, and also note that calling asyncWait
// on a closed stream works and will dispatch an event immediately.
}
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::Resume()
{
LOG(("nsInputStreamPump::Resume [this=%x]\n", this));
NS_ENSURE_TRUE(mSuspendCount > 0, NS_ERROR_UNEXPECTED);
NS_ENSURE_TRUE(mState != STATE_IDLE, NS_ERROR_UNEXPECTED);
if (--mSuspendCount == 0)
EnsureWaiting();
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::Resume()
{
ReentrantMonitorAutoEnter mon(mMonitor);
LOG(("nsInputStreamPump::Resume [this=%p]\n", this));
NS_ENSURE_TRUE(mSuspendCount > 0, NS_ERROR_UNEXPECTED);
NS_ENSURE_TRUE(mState != STATE_IDLE, NS_ERROR_UNEXPECTED);
if (--mSuspendCount == 0)
EnsureWaiting();
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream *stream)
{
LOG(("nsInputStreamPump::OnInputStreamReady [this=%x]\n", this));
SAMPLE_LABEL("Input", "nsInputStreamPump::OnInputStreamReady");
// this function has been called from a PLEvent, so we can safely call
// any listener or progress sink methods directly from here.
for (;;) {
if (mSuspendCount || mState == STATE_IDLE) {
mWaiting = false;
break;
}
PRUint32 nextState;
switch (mState) {
case STATE_START:
nextState = OnStateStart();
break;
case STATE_TRANSFER:
nextState = OnStateTransfer();
break;
case STATE_STOP:
nextState = OnStateStop();
break;
default:
nextState = 0;
NS_NOTREACHED("Unknown enum value.");
return NS_ERROR_UNEXPECTED;
}
if (mState == nextState && !mSuspendCount) {
NS_ASSERTION(mState == STATE_TRANSFER, "unexpected state");
NS_ASSERTION(NS_SUCCEEDED(mStatus), "unexpected status");
mWaiting = false;
mStatus = EnsureWaiting();
if (NS_SUCCEEDED(mStatus))
break;
nextState = STATE_STOP;
}
mState = nextState;
}
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::AsyncRead(nsIStreamListener *listener, nsISupports *ctxt)
{
NS_ENSURE_TRUE(mState == STATE_IDLE, NS_ERROR_IN_PROGRESS);
NS_ENSURE_ARG_POINTER(listener);
//
// OK, we need to use the stream transport service if
//
// (1) the stream is blocking
// (2) the stream does not support nsIAsyncInputStream
//
bool nonBlocking;
nsresult rv = mStream->IsNonBlocking(&nonBlocking);
if (NS_FAILED(rv)) return rv;
if (nonBlocking) {
mAsyncStream = do_QueryInterface(mStream);
//
// if the stream supports nsIAsyncInputStream, and if we need to seek
// to a starting offset, then we must do so here. in the non-async
// stream case, the stream transport service will take care of seeking
// for us.
//
if (mAsyncStream && (mStreamOffset != LL_MAXUINT)) {
nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mStream);
if (seekable)
seekable->Seek(nsISeekableStream::NS_SEEK_SET, mStreamOffset);
}
}
if (!mAsyncStream) {
// ok, let's use the stream transport service to read this stream.
nsCOMPtr<nsIStreamTransportService> sts =
do_GetService(kStreamTransportServiceCID, &rv);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsITransport> transport;
rv = sts->CreateInputTransport(mStream, mStreamOffset, mStreamLength,
mCloseWhenDone, getter_AddRefs(transport));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsIInputStream> wrapper;
rv = transport->OpenInputStream(0, mSegSize, mSegCount, getter_AddRefs(wrapper));
if (NS_FAILED(rv)) return rv;
mAsyncStream = do_QueryInterface(wrapper, &rv);
if (NS_FAILED(rv)) return rv;
}
// release our reference to the original stream. from this point forward,
// we only reference the "stream" via mAsyncStream.
mStream = 0;
// mStreamOffset now holds the number of bytes currently read. we use this
// to enforce the mStreamLength restriction.
mStreamOffset = 0;
// grab event queue (we must do this here by contract, since all notifications
// must go to the thread which called AsyncRead)
mTargetThread = do_GetCurrentThread();
NS_ENSURE_STATE(mTargetThread);
rv = EnsureWaiting();
if (NS_FAILED(rv)) return rv;
if (mLoadGroup)
mLoadGroup->AddRequest(this, nullptr);
mState = STATE_START;
mListener = listener;
mListenerContext = ctxt;
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream *stream)
{
LOG(("nsInputStreamPump::OnInputStreamReady [this=%p]\n", this));
PROFILER_LABEL("nsInputStreamPump", "OnInputStreamReady",
js::ProfileEntry::Category::NETWORK);
// this function has been called from a PLEvent, so we can safely call
// any listener or progress sink methods directly from here.
for (;;) {
// There should only be one iteration of this loop happening at a time.
// To prevent AsyncWait() (called during callbacks or on other threads)
// from creating a parallel OnInputStreamReady(), we use:
// -- a monitor; and
// -- a boolean mProcessingCallbacks to detect parallel loops
// when exiting the monitor for callbacks.
ReentrantMonitorAutoEnter lock(mMonitor);
// Prevent parallel execution during callbacks, while out of monitor.
if (mProcessingCallbacks) {
MOZ_ASSERT(!mProcessingCallbacks);
break;
}
mProcessingCallbacks = true;
if (mSuspendCount || mState == STATE_IDLE) {
mWaitingForInputStreamReady = false;
mProcessingCallbacks = false;
break;
}
uint32_t nextState;
switch (mState) {
case STATE_START:
nextState = OnStateStart();
break;
case STATE_TRANSFER:
nextState = OnStateTransfer();
break;
case STATE_STOP:
mRetargeting = false;
nextState = OnStateStop();
break;
default:
nextState = 0;
NS_NOTREACHED("Unknown enum value.");
return NS_ERROR_UNEXPECTED;
}
bool stillTransferring = (mState == STATE_TRANSFER &&
nextState == STATE_TRANSFER);
if (stillTransferring) {
NS_ASSERTION(NS_SUCCEEDED(mStatus),
"Should not have failed status for ongoing transfer");
} else {
NS_ASSERTION(mState != nextState,
"Only OnStateTransfer can be called more than once.");
}
if (mRetargeting) {
NS_ASSERTION(mState != STATE_STOP,
"Retargeting should not happen during OnStateStop.");
}
// Set mRetargeting so EnsureWaiting will be called. It ensures that
// OnStateStop is called on the main thread.
if (nextState == STATE_STOP && !NS_IsMainThread()) {
mRetargeting = true;
}
// Unset mProcessingCallbacks here (while we have lock) so our own call to
// EnsureWaiting isn't blocked by it.
mProcessingCallbacks = false;
// We must break the loop when we're switching event delivery to another
// thread and the input stream pump is suspended, otherwise
// OnStateStop() might be called off the main thread. See bug 1026951
// comment #107 for the exact scenario.
if (mSuspendCount && mRetargeting) {
mState = nextState;
mWaitingForInputStreamReady = false;
break;
}
// Wait asynchronously if there is still data to transfer, or we're
// switching event delivery to another thread.
if (!mSuspendCount && (stillTransferring || mRetargeting)) {
mState = nextState;
mWaitingForInputStreamReady = false;
nsresult rv = EnsureWaiting();
if (NS_SUCCEEDED(rv))
break;
// Failure to start asynchronous wait: stop transfer.
// Do not set mStatus if it was previously set to report a failure.
if (NS_SUCCEEDED(mStatus)) {
mStatus = rv;
}
nextState = STATE_STOP;
}
mState = nextState;
}
return NS_OK;
}
NS_IMETHODIMP
nsInputStreamPump::OnInputStreamReady(nsIAsyncInputStream *stream)
{
LOG(("nsInputStreamPump::OnInputStreamReady [this=%p]\n", this));
PROFILER_LABEL("Input", "nsInputStreamPump::OnInputStreamReady");
// this function has been called from a PLEvent, so we can safely call
// any listener or progress sink methods directly from here.
for (;;) {
if (mSuspendCount || mState == STATE_IDLE) {
mWaiting = false;
break;
}
uint32_t nextState;
switch (mState) {
case STATE_START:
nextState = OnStateStart();
break;
case STATE_TRANSFER:
nextState = OnStateTransfer();
break;
case STATE_STOP:
mRetargeting = false;
nextState = OnStateStop();
break;
default:
nextState = 0;
NS_NOTREACHED("Unknown enum value.");
return NS_ERROR_UNEXPECTED;
}
bool stillTransferring = (mState == STATE_TRANSFER &&
nextState == STATE_TRANSFER);
if (stillTransferring) {
NS_ASSERTION(NS_SUCCEEDED(mStatus),
"Should not have failed status for ongoing transfer");
} else {
NS_ASSERTION(mState != nextState,
"Only OnStateTransfer can be called more than once.");
}
if (mRetargeting) {
NS_ASSERTION(mState != STATE_STOP,
"Retargeting should not happen during OnStateStop.");
}
// Set mRetargeting so EnsureWaiting will be called. It ensures that
// OnStateStop is called on the main thread.
if (nextState == STATE_STOP && !NS_IsMainThread()) {
mRetargeting = true;
}
// Wait asynchronously if there is still data to transfer, or we're
// switching event delivery to another thread.
if (!mSuspendCount && (stillTransferring || mRetargeting)) {
mState = nextState;
mWaiting = false;
nsresult rv = EnsureWaiting();
if (NS_SUCCEEDED(rv))
break;
// Failure to start asynchronous wait: stop transfer.
// Do not set mStatus if it was previously set to report a failure.
if (NS_SUCCEEDED(mStatus)) {
mStatus = rv;
}
nextState = STATE_STOP;
}
mState = nextState;
}
return NS_OK;
}