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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "RemoteStreamGetter.h"
#include "mozilla/MozPromise.h"
#include "mozilla/net/NeckoChild.h"
#include "mozilla/RefPtr.h"
#include "mozilla/ResultExtensions.h"
#include "nsContentUtils.h"
#include "nsIInputStreamPump.h"
namespace mozilla {
namespace net {
NS_IMPL_ISUPPORTS(RemoteStreamGetter, nsICancelable)
RemoteStreamGetter::RemoteStreamGetter(nsIURI* aURI, nsILoadInfo* aLoadInfo)
: mURI(aURI), mLoadInfo(aLoadInfo) {
MOZ_ASSERT(aURI);
MOZ_ASSERT(aLoadInfo);
}
// Request an input stream from the parent.
RequestOrReason RemoteStreamGetter::GetAsync(nsIStreamListener* aListener,
nsIChannel* aChannel,
Method aMethod) {
MOZ_ASSERT(IsNeckoChild());
MOZ_ASSERT(aMethod);
mListener = aListener;
mChannel = aChannel;
nsCOMPtr<nsICancelable> cancelableRequest(this);
RefPtr<RemoteStreamGetter> self = this;
LoadInfoArgs loadInfoArgs;
nsresult rv = ipc::LoadInfoToLoadInfoArgs(mLoadInfo, &loadInfoArgs);
if (NS_FAILED(rv)) {
return Err(rv);
}
(gNeckoChild->*aMethod)(mURI, loadInfoArgs)
->Then(
GetMainThreadSerialEventTarget(), __func__,
[self](const Maybe<RemoteStreamInfo>& info) { self->OnStream(info); },
[self](const mozilla::ipc::ResponseRejectReason) {
self->OnStream(Nothing());
});
return RequestOrCancelable(WrapNotNull(cancelableRequest));
}
// Called to cancel the ongoing async request.
NS_IMETHODIMP
RemoteStreamGetter::Cancel(nsresult aStatus) {
if (mCanceled) {
return NS_OK;
}
mCanceled = true;
mStatus = aStatus;
if (mPump) {
mPump->Cancel(aStatus);
mPump = nullptr;
}
return NS_OK;
}
// static
void RemoteStreamGetter::CancelRequest(nsIStreamListener* aListener,
nsIChannel* aChannel, nsresult aResult) {
MOZ_ASSERT(aListener);
MOZ_ASSERT(aChannel);
aListener->OnStartRequest(aChannel);
aListener->OnStopRequest(aChannel, aResult);
aChannel->CancelWithReason(NS_BINDING_ABORTED,
"RemoteStreamGetter::CancelRequest"_ns);
}
// Handle an input stream sent from the parent.
void RemoteStreamGetter::OnStream(const Maybe<RemoteStreamInfo>& aStreamInfo) {
MOZ_ASSERT(IsNeckoChild());
MOZ_ASSERT(mChannel);
MOZ_ASSERT(mListener);
nsCOMPtr<nsIChannel> channel = std::move(mChannel);
// We must keep an owning reference to the listener until we pass it on
// to AsyncRead.
nsCOMPtr<nsIStreamListener> listener = mListener.forget();
if (aStreamInfo.isNothing()) {
// The parent didn't send us back a stream.
CancelRequest(listener, channel, NS_ERROR_FILE_ACCESS_DENIED);
return;
}
if (mCanceled) {
// The channel that has created this stream getter has been canceled.
CancelRequest(listener, channel, mStatus);
return;
}
nsCOMPtr<nsIInputStream> stream = std::move(aStreamInfo.ref().inputStream());
if (!stream) {
// We somehow failed to get a stream, so just cancel the request.
CancelRequest(listener, channel, mStatus);
return;
}
nsCOMPtr<nsIInputStreamPump> pump;
nsresult rv =
NS_NewInputStreamPump(getter_AddRefs(pump), stream.forget(), 0, 0, false,
GetMainThreadSerialEventTarget());
if (NS_FAILED(rv)) {
CancelRequest(listener, channel, rv);
return;
}
channel->SetContentType(aStreamInfo.ref().contentType());
channel->SetContentLength(aStreamInfo.ref().contentLength());
rv = pump->AsyncRead(listener);
if (NS_FAILED(rv)) {
CancelRequest(listener, channel, rv);
return;
}
mPump = pump;
}
} // namespace net
} // namespace mozilla
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