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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_TETHER_MESSAGE_WRAPPER_H_
#define CHROMEOS_ASH_COMPONENTS_TETHER_MESSAGE_WRAPPER_H_
#include <google/protobuf/message_lite.h>
#include <memory>
#include "chromeos/ash/components/tether/proto/tether.pb.h"
namespace ash {
namespace tether {
// Wraps a message sent between devices. To send a message over the wire,
// construct a MessageWrapper by passing the message's proto as a constructor
// parameter, then call |ToRawMessage()| and send the resulting string. When a
// message has been received, pass it to |FromRawMessage()| to create a
// MessageWrapper object, then use |GetMessageType()| to determine the type of
// message that has been received. To access the wrapped proto for a received
// message, call |GetProto()| and cast the result to the associated message
// class.
class MessageWrapper {
public:
// Creates a MessageWrapper from a raw string received from a remote device.
// Returns |nullptr| if the received message is not a valid tethering message.
static std::unique_ptr<MessageWrapper> FromRawMessage(
const std::string& message);
MessageWrapper(const ConnectTetheringRequest& request);
MessageWrapper(const ConnectTetheringResponse& response);
MessageWrapper(const DisconnectTetheringRequest& request);
MessageWrapper(const KeepAliveTickle& tickle);
MessageWrapper(const KeepAliveTickleResponse& response);
MessageWrapper(const TetherAvailabilityRequest& request);
MessageWrapper(const TetherAvailabilityResponse& response);
MessageWrapper(const MessageWrapper&) = delete;
MessageWrapper& operator=(const MessageWrapper&) = delete;
~MessageWrapper();
google::protobuf::MessageLite* GetProto() const;
MessageType GetMessageType() const;
// To send a message to a remote device, use ToRawMessage() and send the
// result over the wire.
std::string ToRawMessage() const;
protected:
MessageWrapper(const MessageType& type,
std::unique_ptr<google::protobuf::MessageLite> proto);
private:
MessageType type_;
std::unique_ptr<google::protobuf::MessageLite> proto_;
};
} // namespace tether
} // namespace ash
#endif // CHROMEOS_ASH_COMPONENTS_TETHER_MESSAGE_WRAPPER_H_
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