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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_
#define GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_
#include <memory>
#include "base/functional/callback.h"
#include "google_apis/gcm/base/gcm_export.h"
#include "mojo/public/cpp/system/data_pipe.h"
namespace net{
class StreamSocket;
} // namespace net
namespace google {
namespace protobuf {
class MessageLite;
} // namespace protobuf
} // namespace google
namespace mcs_proto {
class LoginRequest;
}
namespace gcm {
// Handles performing the protocol handshake and sending/receiving protobuf
// messages. Note that no retrying or queueing is enforced at this layer.
// Once a connection error is encountered, the ConnectionHandler will disconnect
// the socket and must be reinitialized with a new StreamSocket before
// messages can be sent/received again.
class GCM_EXPORT ConnectionHandler {
public:
using ProtoReceivedCallback = base::RepeatingCallback<void(
std::unique_ptr<google::protobuf::MessageLite>)>;
using ProtoSentCallback = base::RepeatingClosure;
using ConnectionChangedCallback = base::RepeatingCallback<void(int)>;
ConnectionHandler();
virtual ~ConnectionHandler();
// Starts a new MCS connection handshake (using |login_request|) and, upon
// success, begins listening for incoming/outgoing messages.
//
// Note: It is correct and expected to call Init more than once, as connection
// issues are encountered and new connections must be made.
virtual void Init(const mcs_proto::LoginRequest& login_request,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream) = 0;
// Resets the handler and any internal state. Should be called any time
// a connection reset happens externally to the handler.
virtual void Reset() = 0;
// Checks that a handshake has been completed and a message is not already
// in flight.
virtual bool CanSendMessage() const = 0;
// Send an MCS protobuf message. CanSendMessage() must be true.
virtual void SendMessage(const google::protobuf::MessageLite& message) = 0;
};
} // namespace gcm
#endif // GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_
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