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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.
#ifndef CAST_COMMON_PUBLIC_CAST_SOCKET_H_
#define CAST_COMMON_PUBLIC_CAST_SOCKET_H_
#include <array>
#include <memory>
#include <vector>
#include "platform/api/tls_connection.h"
#include "util/weak_ptr.h"
namespace cast {
namespace channel {
class CastMessage;
} // namespace channel
} // namespace cast
namespace openscreen {
namespace cast {
// Represents a simple message-oriented socket for communicating with the Cast
// V2 protocol. It isn't thread-safe, so it should only be used on the same
// TaskRunner thread as its TlsConnection.
class CastSocket : public TlsConnection::Client {
public:
class Client {
public:
// Called when a terminal error on |socket| has occurred.
virtual void OnError(CastSocket* socket, Error error) = 0;
virtual void OnMessage(CastSocket* socket,
::cast::channel::CastMessage message) = 0;
protected:
virtual ~Client();
};
CastSocket(std::unique_ptr<TlsConnection> connection, Client* client);
~CastSocket();
// Sends |message| immediately unless the underlying TLS connection is
// write-blocked, in which case |message| will be queued. An error will be
// returned if |message| cannot be serialized for any reason, even while
// write-blocked.
[[nodiscard]] Error Send(const ::cast::channel::CastMessage& message);
void SetClient(Client* client);
std::array<uint8_t, 2> GetSanitizedIpAddress();
int socket_id() const { return socket_id_; }
void set_audio_only(bool audio_only) { audio_only_ = audio_only; }
bool audio_only() const { return audio_only_; }
// TlsConnection::Client overrides.
void OnError(TlsConnection* connection, Error error) override;
void OnRead(TlsConnection* connection, std::vector<uint8_t> block) override;
WeakPtr<CastSocket> GetWeakPtr() const { return weak_factory_.GetWeakPtr(); }
private:
enum class State : bool {
kOpen = true,
kError = false,
};
static int g_next_socket_id_;
const std::unique_ptr<TlsConnection> connection_;
Client* client_; // May never be null.
const int socket_id_;
bool audio_only_ = false;
std::vector<uint8_t> read_buffer_;
State state_ = State::kOpen;
WeakPtrFactory<CastSocket> weak_factory_{this};
};
// Returns socket->socket_id() if |socket| is not null, otherwise 0.
constexpr int ToCastSocketId(CastSocket* socket) {
return socket ? socket->socket_id() : 0;
}
} // namespace cast
} // namespace openscreen
#endif // CAST_COMMON_PUBLIC_CAST_SOCKET_H_
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