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#pragma once
#include <boost/noncopyable.hpp>
#include <IO/ReadBuffer.h>
#include <IO/WriteBuffer.h>
#include "IMySQLReadPacket.h"
#include "IMySQLWritePacket.h"
#include "IO/MySQLPacketPayloadReadBuffer.h"
namespace DB
{
namespace MySQLProtocol
{
/* Writes and reads packets, keeping sequence-id.
* Throws ProtocolError, if packet with incorrect sequence-id was received.
*/
class PacketEndpoint : boost::noncopyable
{
public:
uint8_t & sequence_id;
ReadBuffer * in;
WriteBuffer * out;
/// For writing.
PacketEndpoint(WriteBuffer & out_, uint8_t & sequence_id_);
/// For reading and writing.
PacketEndpoint(ReadBuffer & in_, WriteBuffer & out_, uint8_t & sequence_id_);
MySQLPacketPayloadReadBuffer getPayload();
void receivePacket(IMySQLReadPacket & packet);
bool tryReceivePacket(IMySQLReadPacket & packet, UInt64 millisecond = 0);
/// Sets sequence-id to 0. Must be called before each command phase.
void resetSequenceId();
template<class T>
void sendPacket(const T & packet, bool flush = false)
{
static_assert(std::is_base_of<IMySQLWritePacket, T>());
packet.writePayload(*out, sequence_id);
if (flush)
out->next();
}
/// Converts packet to text. Is used for debug output.
static String packetToText(const String & payload);
};
using PacketEndpointPtr = std::shared_ptr<PacketEndpoint>;
}
}
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