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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.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_ADAPTERS_SCTP_TRANSPORT_PROXY_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_ADAPTERS_SCTP_TRANSPORT_PROXY_H_
#include <memory>
#include "base/memory/scoped_refptr.h"
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/renderer/platform/heap/cross_thread_handle.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/visitor.h"
#include "third_party/webrtc/api/sctp_transport_interface.h"
// The SctpTransportProxy class takes care of thread-jumping when
// connecting callbacks from a webrtc::SctpTransport to a
// blink::RTCSctpTransport object.
// Its design is modeled on the IceTransportProxy design,
// but does not use so many layers of indirection - there is
// no control, and all information is passed via callbacks on the Delegate.
// The proxy thread = the Blink main thread
// The host thread = the webrtc signalling thread (the one that gets callbacks)
namespace blink {
class LocalFrame;
class SctpTransportProxy : public webrtc::SctpTransportObserverInterface {
public:
// Delegate class for actions caused by the Proxy, but executed on the
// main thread. The Delegate must remain alive until it has observed
// the kClosed state, which is the last thing that can happen.
class Delegate : public blink::GarbageCollectedMixin {
public:
virtual ~Delegate() = default;
// Called when the Create() function is complete. Sends current state,
// but does not indicate a state change.
virtual void OnStartCompleted(webrtc::SctpTransportInformation info) = 0;
// Called when a state change is signalled from transport.
virtual void OnStateChange(webrtc::SctpTransportInformation info) = 0;
void Trace(Visitor* visitor) const override {}
};
// Constructs a SctpTransportProxy. The caller is responsible for keeping
// |sctp_transport| alive until after the SctpTransportProxy is deleted.
// The SctpTransportProxy takes a <CrossThreadPersistent> reference to the
// Delegate, preventing it from being garbage collected until the |kClosed|
// state is reached.
// The SctpTransportProxy can only be safely deleted after seeing the state
// |kClosed|, since this is the last event that can happen on the transport.
static std::unique_ptr<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);
~SctpTransportProxy() override {}
private:
SctpTransportProxy(
LocalFrame& frame,
scoped_refptr<base::SingleThreadTaskRunner> proxy_thread,
scoped_refptr<base::SingleThreadTaskRunner> host_thread,
webrtc::scoped_refptr<webrtc::SctpTransportInterface> sctp_transport,
Delegate* delegate);
// Implementation of webrtc::SctpTransportObserver
void OnStateChange(webrtc::SctpTransportInformation info) override;
// Internal helper for Create()
void StartOnHostThread();
const scoped_refptr<base::SingleThreadTaskRunner> proxy_thread_;
const scoped_refptr<base::SingleThreadTaskRunner> host_thread_;
const webrtc::scoped_refptr<webrtc::SctpTransportInterface> sctp_transport_;
UnwrappingCrossThreadHandle<Delegate> delegate_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_ADAPTERS_SCTP_TRANSPORT_PROXY_H_
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