ClickHouse/dbms/include/DB/IO/InterserverWriteBuffer.h

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#pragma once
#include <DB/IO/WriteBuffer.h>
#include <DB/IO/HashingWriteBuffer.h>
#include <Poco/Net/HTTPClientSession.h>
namespace DB
{
namespace
{
constexpr auto DEFAULT_REMOTE_WRITE_BUFFER_CONNECTION_TIMEOUT = 1;
constexpr auto DEFAULT_REMOTE_WRITE_BUFFER_RECEIVE_TIMEOUT = 1800;
constexpr auto DEFAULT_REMOTE_WRITE_BUFFER_SEND_TIMEOUT = 1800;
}
/** Позволяет писать файл на удалённый сервер.
*/
class InterserverWriteBuffer final : public WriteBuffer
{
public:
InterserverWriteBuffer(const std::string & host_, int port_,
const std::string & endpoint_,
const std::string & path_,
bool compress_ = false,
size_t buffer_size_ = DBMS_DEFAULT_BUFFER_SIZE,
const Poco::Timespan & connection_timeout = Poco::Timespan(DEFAULT_REMOTE_WRITE_BUFFER_CONNECTION_TIMEOUT, 0),
const Poco::Timespan & send_timeout = Poco::Timespan(DEFAULT_REMOTE_WRITE_BUFFER_SEND_TIMEOUT, 0),
const Poco::Timespan & receive_timeout = Poco::Timespan(DEFAULT_REMOTE_WRITE_BUFFER_RECEIVE_TIMEOUT, 0));
~InterserverWriteBuffer();
void finalize();
void cancel();
private:
void nextImpl() override;
private:
std::string host;
int port;
std::string path;
Poco::Net::HTTPClientSession session;
std::ostream * ostr; /// этим владеет session
std::unique_ptr<WriteBuffer> impl;
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/// Отправили все данные и переименовали файл
bool finalized = false;
};
}