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// Copyright 2019 The Chromium Authors
// 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/adapters/sctp_transport_proxy.h"
#include <memory>
#include <utility>
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/modules/peerconnection/adapters/web_rtc_cross_thread_copier.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
namespace blink {
// static
std::unique_ptr<SctpTransportProxy> SctpTransportProxy::Create(
LocalFrame& frame,
scoped_refptr<base::SingleThreadTaskRunner> proxy_thread,
scoped_refptr<base::SingleThreadTaskRunner> host_thread,
webrtc::scoped_refptr<webrtc::SctpTransportInterface> sctp_transport,
Delegate* delegate) {
DCHECK(proxy_thread->BelongsToCurrentThread());
std::unique_ptr<SctpTransportProxy> proxy =
base::WrapUnique(new SctpTransportProxy(frame, proxy_thread, host_thread,
sctp_transport, delegate));
PostCrossThreadTask(
*host_thread, FROM_HERE,
CrossThreadBindOnce(&SctpTransportProxy::StartOnHostThread,
CrossThreadUnretained(proxy.get())));
return proxy;
}
SctpTransportProxy::SctpTransportProxy(
LocalFrame& frame,
scoped_refptr<base::SingleThreadTaskRunner> proxy_thread,
scoped_refptr<base::SingleThreadTaskRunner> host_thread,
webrtc::scoped_refptr<webrtc::SctpTransportInterface> sctp_transport,
Delegate* delegate)
: proxy_thread_(std::move(proxy_thread)),
host_thread_(std::move(host_thread)),
sctp_transport_(std::move(sctp_transport)),
delegate_(MakeUnwrappingCrossThreadHandle(delegate)) {}
void SctpTransportProxy::StartOnHostThread() {
DCHECK(host_thread_->BelongsToCurrentThread());
sctp_transport_->RegisterObserver(this);
PostCrossThreadTask(
*proxy_thread_, FROM_HERE,
CrossThreadBindOnce(&Delegate::OnStartCompleted,
MakeUnwrappingCrossThreadHandle(delegate_),
sctp_transport_->Information()));
}
void SctpTransportProxy::OnStateChange(webrtc::SctpTransportInformation info) {
DCHECK(host_thread_->BelongsToCurrentThread());
// Closed is the last state that can happen, so unregister when we see this.
// Unregistering allows us to safely delete the proxy independent of the
// state of the webrtc::SctpTransport.
if (info.state() == webrtc::SctpTransportState::kClosed) {
sctp_transport_->UnregisterObserver();
}
PostCrossThreadTask(
*proxy_thread_, FROM_HERE,
CrossThreadBindOnce(&Delegate::OnStateChange,
MakeUnwrappingCrossThreadHandle(delegate_), info));
if (info.state() == webrtc::SctpTransportState::kClosed) {
// Don't hold on to |delegate| any more.
delegate_.Clear();
}
}
} // namespace blink
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