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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/peerconnection/rtc_sctp_transport.h"
#include <limits>
#include <memory>
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
#include "third_party/blink/renderer/modules/peerconnection/adapters/sctp_transport_proxy.h"
#include "third_party/blink/renderer/modules/peerconnection/peer_connection_dependency_factory.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_dtls_transport.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_error_util.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/webrtc/api/peer_connection_interface.h"
#include "third_party/webrtc/api/sctp_transport_interface.h"
namespace blink {
namespace {
String TransportStateToString(webrtc::SctpTransportState state) {
switch (state) {
case webrtc::SctpTransportState::kNew:
// Not supposed to happen. DtlsTransport should
// only be visible after reaching "connecting" state.
NOTREACHED();
return String("new");
case webrtc::SctpTransportState::kConnecting:
return String("connecting");
case webrtc::SctpTransportState::kConnected:
return String("connected");
case webrtc::SctpTransportState::kClosed:
return String("closed");
default:
NOTREACHED();
return String("failed");
}
}
std::unique_ptr<SctpTransportProxy> CreateProxy(
ExecutionContext* context,
webrtc::SctpTransportInterface* native_transport,
SctpTransportProxy::Delegate* delegate,
scoped_refptr<base::SingleThreadTaskRunner> main_thread,
scoped_refptr<base::SingleThreadTaskRunner> worker_thread) {
DCHECK(main_thread);
DCHECK(worker_thread);
LocalFrame* frame = To<LocalDOMWindow>(context)->GetFrame();
DCHECK(frame);
return SctpTransportProxy::Create(*frame, main_thread, worker_thread,
native_transport, delegate);
}
} // namespace
RTCSctpTransport::RTCSctpTransport(
ExecutionContext* context,
rtc::scoped_refptr<webrtc::SctpTransportInterface> native_transport)
: RTCSctpTransport(context,
native_transport,
context->GetTaskRunner(TaskType::kNetworking),
PeerConnectionDependencyFactory::GetInstance()
->GetWebRtcWorkerTaskRunner()) {}
RTCSctpTransport::RTCSctpTransport(
ExecutionContext* context,
rtc::scoped_refptr<webrtc::SctpTransportInterface> native_transport,
scoped_refptr<base::SingleThreadTaskRunner> main_thread,
scoped_refptr<base::SingleThreadTaskRunner> worker_thread)
: ExecutionContextClient(context),
current_state_(webrtc::SctpTransportState::kNew),
native_transport_(native_transport),
proxy_(CreateProxy(context,
native_transport,
this,
main_thread,
worker_thread)) {}
RTCSctpTransport::~RTCSctpTransport() {}
String RTCSctpTransport::state() const {
if (closed_from_owner_) {
return TransportStateToString(webrtc::SctpTransportState::kClosed);
}
return TransportStateToString(current_state_.state());
}
double RTCSctpTransport::maxMessageSize() const {
if (current_state_.MaxMessageSize()) {
return *current_state_.MaxMessageSize();
}
// Spec says:
// If local size is unlimited and remote side is unknown, return infinity.
// http://w3c.github.io/webrtc-pc/#dfn-update-the-data-max-message-size
return std::numeric_limits<double>::infinity();
}
base::Optional<int16_t> RTCSctpTransport::maxChannels() const {
if (!current_state_.MaxChannels())
return base::nullopt;
return current_state_.MaxChannels().value();
}
RTCDtlsTransport* RTCSctpTransport::transport() const {
return dtls_transport_;
}
rtc::scoped_refptr<webrtc::SctpTransportInterface>
RTCSctpTransport::native_transport() {
return native_transport_;
}
void RTCSctpTransport::ChangeState(webrtc::SctpTransportInformation info) {
DCHECK(current_state_.state() != webrtc::SctpTransportState::kClosed);
current_state_ = info;
}
void RTCSctpTransport::SetTransport(RTCDtlsTransport* transport) {
dtls_transport_ = transport;
}
// Implementation of SctpTransportProxy::Delegate
void RTCSctpTransport::OnStartCompleted(webrtc::SctpTransportInformation info) {
current_state_ = info;
start_completed_ = true;
}
void RTCSctpTransport::OnStateChange(webrtc::SctpTransportInformation info) {
// We depend on closed only happening once for safe garbage collection.
DCHECK(current_state_.state() != webrtc::SctpTransportState::kClosed);
current_state_ = info;
// When Close() has been called, we do not report the state change from the
// lower layer, but we keep the SctpTransport object alive until the
// lower layer has sent notice that the closing has been completed.
if (!closed_from_owner_) {
DispatchEvent(*Event::Create(event_type_names::kStatechange));
}
}
void RTCSctpTransport::Close() {
closed_from_owner_ = true;
if (current_state_.state() != webrtc::SctpTransportState::kClosed) {
DispatchEvent(*Event::Create(event_type_names::kStatechange));
}
}
const AtomicString& RTCSctpTransport::InterfaceName() const {
return event_target_names::kRTCSctpTransport;
}
ExecutionContext* RTCSctpTransport::GetExecutionContext() const {
return ExecutionContextClient::GetExecutionContext();
}
void RTCSctpTransport::Trace(Visitor* visitor) {
visitor->Trace(dtls_transport_);
EventTargetWithInlineData::Trace(visitor);
ExecutionContextClient::Trace(visitor);
SctpTransportProxy::Delegate::Trace(visitor);
}
} // namespace blink
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