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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "mozilla/dom/WebTransportStreams.h"
#include "mozilla/dom/WebTransportLog.h"
#include "mozilla/dom/Promise-inl.h"
#include "mozilla/dom/WebTransport.h"
#include "mozilla/dom/WebTransportBidirectionalStream.h"
#include "mozilla/dom/WebTransportReceiveStream.h"
#include "mozilla/dom/WebTransportSendStream.h"
#include "mozilla/Result.h"
using namespace mozilla::ipc;
namespace mozilla::dom {
NS_IMPL_CYCLE_COLLECTION_INHERITED(WebTransportIncomingStreamsAlgorithms,
UnderlyingSourceAlgorithmsWrapper,
mTransport, mCallback)
NS_IMPL_ADDREF_INHERITED(WebTransportIncomingStreamsAlgorithms,
UnderlyingSourceAlgorithmsWrapper)
NS_IMPL_RELEASE_INHERITED(WebTransportIncomingStreamsAlgorithms,
UnderlyingSourceAlgorithmsWrapper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(WebTransportIncomingStreamsAlgorithms)
NS_INTERFACE_MAP_END_INHERITING(UnderlyingSourceAlgorithmsWrapper)
WebTransportIncomingStreamsAlgorithms::WebTransportIncomingStreamsAlgorithms(
StreamType aUnidirectional, WebTransport* aTransport)
: mUnidirectional(aUnidirectional), mTransport(aTransport) {}
WebTransportIncomingStreamsAlgorithms::
~WebTransportIncomingStreamsAlgorithms() = default;
already_AddRefed<Promise>
WebTransportIncomingStreamsAlgorithms::PullCallbackImpl(
JSContext* aCx, ReadableStreamController& aController, ErrorResult& aRv) {
// https://w3c.github.io/webtransport/#pullbidirectionalstream and
// https://w3c.github.io/webtransport/#pullunidirectionalstream
// Step 1: If transport.[[State]] is "connecting", then return the result
// of performing the following steps upon fulfillment of
// transport.[[Ready]]:
// We don't explicitly check mState here, since we'll reject
// mIncomingStreamPromise if we go to FAILED or CLOSED
//
// Step 2: Let session be transport.[[Session]].
// Step 3: Let p be a new promise.
RefPtr<Promise> promise =
Promise::CreateInfallible(mTransport->GetParentObject());
RefPtr<WebTransportIncomingStreamsAlgorithms> self(this);
// The real work of PullCallback()
// Step 5: Wait until there is an available incoming unidirectional stream.
auto length = (mUnidirectional == StreamType::Unidirectional)
? mTransport->mUnidirectionalStreams.Length()
: mTransport->mBidirectionalStreams.Length();
if (length == 0) {
// We need to wait.
// Per
// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-pulling
// we can't be called again until the promise is resolved
MOZ_ASSERT(!mCallback);
mCallback = promise;
LOG(("Incoming%sDirectionalStreams Pull waiting for a stream",
mUnidirectional == StreamType::Unidirectional ? "Uni" : "Bi"));
Result<RefPtr<Promise>, nsresult> returnResult =
promise->ThenWithCycleCollectedArgs(
[](JSContext* aCx, JS::Handle<JS::Value>, ErrorResult& aRv,
RefPtr<WebTransportIncomingStreamsAlgorithms> self,
RefPtr<Promise> aPromise) -> already_AddRefed<Promise> {
self->BuildStream(aCx, aRv);
return nullptr;
},
self, promise);
if (returnResult.isErr()) {
// XXX Reject?
aRv.Throw(returnResult.unwrapErr());
return nullptr;
}
// Step 4: Return p and run the remaining steps in parallel.
return returnResult.unwrap().forget();
}
self->BuildStream(aCx, aRv);
// Step 4: Return p and run the remaining steps in parallel.
return promise.forget();
}
// Note: fallible
void WebTransportIncomingStreamsAlgorithms::BuildStream(JSContext* aCx,
ErrorResult& aRv) {
// https://w3c.github.io/webtransport/#pullbidirectionalstream and
// https://w3c.github.io/webtransport/#pullunidirectionalstream
LOG(("Incoming%sDirectionalStreams Pull building a stream",
mUnidirectional == StreamType::Unidirectional ? "Uni" : "Bi"));
if (mUnidirectional == StreamType::Unidirectional) {
// Step 6: Let internalStream be the result of receiving an incoming
// unidirectional stream.
MOZ_ASSERT(mTransport->mUnidirectionalStreams.Length() > 0);
std::tuple<uint64_t, RefPtr<mozilla::ipc::DataPipeReceiver>> tuple =
mTransport->mUnidirectionalStreams[0];
mTransport->mUnidirectionalStreams.RemoveElementAt(0);
// Step 7.1: Let stream be the result of creating a
// WebTransportReceiveStream with internalStream and transport
RefPtr<WebTransportReceiveStream> readableStream =
WebTransportReceiveStream::Create(mTransport, mTransport->mGlobal,
std::get<0>(tuple),
std::get<1>(tuple), aRv);
if (MOZ_UNLIKELY(!readableStream)) {
aRv.ThrowUnknownError("Internal error");
return;
}
// Step 7.2 Enqueue stream to transport.[[IncomingUnidirectionalStreams]].
JS::Rooted<JS::Value> jsStream(aCx);
if (MOZ_UNLIKELY(!ToJSValue(aCx, readableStream, &jsStream))) {
aRv.ThrowUnknownError("Internal error");
return;
}
// EnqueueNative is CAN_RUN_SCRIPT
RefPtr<ReadableStream> incomingStream =
mTransport->mIncomingUnidirectionalStreams;
incomingStream->EnqueueNative(aCx, jsStream, aRv);
if (MOZ_UNLIKELY(aRv.Failed())) {
aRv.ThrowUnknownError("Internal error");
return;
}
} else {
// Step 6: Let internalStream be the result of receiving a bidirectional
// stream
MOZ_ASSERT(mTransport->mBidirectionalStreams.Length() > 0);
std::tuple<uint64_t, UniquePtr<BidirectionalPair>> tuple =
std::move(mTransport->mBidirectionalStreams.ElementAt(0));
mTransport->mBidirectionalStreams.RemoveElementAt(0);
RefPtr<DataPipeReceiver> input = std::get<1>(tuple)->first.forget();
RefPtr<DataPipeSender> output = std::get<1>(tuple)->second.forget();
RefPtr<WebTransportBidirectionalStream> stream =
WebTransportBidirectionalStream::Create(mTransport, mTransport->mGlobal,
std::get<0>(tuple), input,
output, aRv);
// Step 7.2 Enqueue stream to transport.[[IncomingBidirectionalStreams]].
JS::Rooted<JS::Value> jsStream(aCx);
if (MOZ_UNLIKELY(!ToJSValue(aCx, stream, &jsStream))) {
return;
}
LOG(("Enqueuing bidirectional stream\n"));
// EnqueueNative is CAN_RUN_SCRIPT
RefPtr<ReadableStream> incomingStream =
mTransport->mIncomingBidirectionalStreams;
incomingStream->EnqueueNative(aCx, jsStream, aRv);
if (MOZ_UNLIKELY(aRv.Failed())) {
return;
}
}
// Step 7.3: Resolve p with undefined.
}
void WebTransportIncomingStreamsAlgorithms::NotifyIncomingStream() {
if (mUnidirectional == StreamType::Unidirectional) {
LOG(("NotifyIncomingStream: %zu Unidirectional ",
mTransport->mUnidirectionalStreams.Length()));
#ifdef DEBUG
auto number = mTransport->mUnidirectionalStreams.Length();
MOZ_ASSERT(number > 0);
#endif
RefPtr<Promise> promise = mCallback.forget();
if (promise) {
promise->MaybeResolveWithUndefined();
}
} else {
LOG(("NotifyIncomingStream: %zu Bidirectional ",
mTransport->mBidirectionalStreams.Length()));
#ifdef DEBUG
auto number = mTransport->mBidirectionalStreams.Length();
MOZ_ASSERT(number > 0);
#endif
RefPtr<Promise> promise = mCallback.forget();
if (promise) {
promise->MaybeResolveWithUndefined();
}
}
}
void WebTransportIncomingStreamsAlgorithms::NotifyRejectAll() {
// cancel all pulls
LOG(("Cancel all WebTransport Pulls"));
// Ensure we clear the callback before resolving/rejecting it
if (RefPtr<Promise> promise = mCallback.forget()) {
promise->MaybeReject(NS_ERROR_FAILURE);
}
}
} // namespace mozilla::dom
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