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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 "nsIOService.h"
#include "nsSyncStreamListener.h"
#include "nsIPipe.h"
#include "nsThreadUtils.h"
#include <algorithm>
nsresult
nsSyncStreamListener::Init()
{
return NS_NewPipe(getter_AddRefs(mPipeIn),
getter_AddRefs(mPipeOut),
nsIOService::gDefaultSegmentSize,
UINT32_MAX, // no size limit
false,
false);
}
nsresult
nsSyncStreamListener::WaitForData()
{
mKeepWaiting = true;
while (mKeepWaiting)
NS_ENSURE_STATE(NS_ProcessNextEvent(NS_GetCurrentThread()));
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsSyncStreamListener::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsSyncStreamListener,
nsIStreamListener,
nsIRequestObserver,
nsIInputStream,
nsISyncStreamListener)
//-----------------------------------------------------------------------------
// nsSyncStreamListener::nsISyncStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsSyncStreamListener::GetInputStream(nsIInputStream **result)
{
NS_ADDREF(*result = this);
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsSyncStreamListener::nsIStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsSyncStreamListener::OnStartRequest(nsIRequest *request,
nsISupports *context)
{
return NS_OK;
}
NS_IMETHODIMP
nsSyncStreamListener::OnDataAvailable(nsIRequest *request,
nsISupports *context,
nsIInputStream *stream,
uint64_t offset,
uint32_t count)
{
uint32_t bytesWritten;
nsresult rv = mPipeOut->WriteFrom(stream, count, &bytesWritten);
// if we get an error, then return failure. this will cause the
// channel to be canceled, and as a result our OnStopRequest method
// will be called immediately. because of this we do not need to
// set mStatus or mKeepWaiting here.
if (NS_FAILED(rv))
return rv;
// we expect that all data will be written to the pipe because
// the pipe was created to have "infinite" room.
NS_ASSERTION(bytesWritten == count, "did not write all data");
mKeepWaiting = false; // unblock Read
return NS_OK;
}
NS_IMETHODIMP
nsSyncStreamListener::OnStopRequest(nsIRequest *request,
nsISupports *context,
nsresult status)
{
mStatus = status;
mKeepWaiting = false; // unblock Read
mDone = true;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsSyncStreamListener::nsIInputStream
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsSyncStreamListener::Close()
{
mStatus = NS_BASE_STREAM_CLOSED;
mDone = true;
// It'd be nice if we could explicitly cancel the request at this point,
// but we don't have a reference to it, so the best we can do is close the
// pipe so that the next OnDataAvailable event will fail.
if (mPipeIn) {
mPipeIn->Close();
mPipeIn = nullptr;
}
return NS_OK;
}
NS_IMETHODIMP
nsSyncStreamListener::Available(uint64_t *result)
{
if (NS_FAILED(mStatus))
return mStatus;
mStatus = mPipeIn->Available(result);
if (NS_SUCCEEDED(mStatus) && (*result == 0) && !mDone) {
mStatus = WaitForData();
if (NS_SUCCEEDED(mStatus))
mStatus = mPipeIn->Available(result);
}
return mStatus;
}
NS_IMETHODIMP
nsSyncStreamListener::Read(char *buf,
uint32_t bufLen,
uint32_t *result)
{
if (mStatus == NS_BASE_STREAM_CLOSED) {
*result = 0;
return NS_OK;
}
uint64_t avail64;
if (NS_FAILED(Available(&avail64)))
return mStatus;
uint32_t avail = (uint32_t)std::min(avail64, (uint64_t)bufLen);
mStatus = mPipeIn->Read(buf, avail, result);
return mStatus;
}
NS_IMETHODIMP
nsSyncStreamListener::ReadSegments(nsWriteSegmentFun writer,
void *closure,
uint32_t count,
uint32_t *result)
{
if (mStatus == NS_BASE_STREAM_CLOSED) {
*result = 0;
return NS_OK;
}
uint64_t avail64;
if (NS_FAILED(Available(&avail64)))
return mStatus;
uint32_t avail = (uint32_t)std::min(avail64, (uint64_t)count);
mStatus = mPipeIn->ReadSegments(writer, closure, avail, result);
return mStatus;
}
NS_IMETHODIMP
nsSyncStreamListener::IsNonBlocking(bool *result)
{
*result = false;
return NS_OK;
}
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