mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-01 14:10:50 +00:00
426 lines
11 KiB
C++
426 lines
11 KiB
C++
#include <Poco/Net/NetException.h>
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#include <Yandex/Revision.h>
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#include <DB/Core/Defines.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/IO/CompressedReadBuffer.h>
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#include <DB/IO/CompressedWriteBuffer.h>
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#include <DB/IO/ReadBufferFromPocoSocket.h>
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#include <DB/IO/WriteBufferFromPocoSocket.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/DataStreams/NativeBlockInputStream.h>
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#include <DB/DataStreams/NativeBlockOutputStream.h>
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#include <DB/Client/Connection.h>
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namespace DB
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{
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void Connection::connect()
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{
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try
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{
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if (connected)
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disconnect();
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LOG_TRACE(log, "Connecting");
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socket.connect(Poco::Net::SocketAddress(host, port), connect_timeout);
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socket.setReceiveTimeout(receive_timeout);
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socket.setSendTimeout(send_timeout);
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in = new ReadBufferFromPocoSocket(socket);
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out = new WriteBufferFromPocoSocket(socket);
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connected = true;
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sendHello();
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receiveHello();
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LOG_TRACE(log, "Connected to " << server_name
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<< " server version " << server_version_major
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<< "." << server_version_minor
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<< "." << server_revision
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<< ".");
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}
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catch (Poco::Net::NetException & e)
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{
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disconnect();
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/// Добавляем в сообщение адрес сервера. Также объект Exception запомнит stack trace. Жаль, что более точный тип исключения теряется.
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throw Exception(e.displayText(), "(" + getServerAddress() + ")", ErrorCodes::NETWORK_ERROR);
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}
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catch (Poco::TimeoutException & e)
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{
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disconnect();
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/// Добавляем в сообщение адрес сервера. Также объект Exception запомнит stack trace. Жаль, что более точный тип исключения теряется.
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throw Exception(e.displayText(), "(" + getServerAddress() + ")", ErrorCodes::SOCKET_TIMEOUT);
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}
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}
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void Connection::disconnect()
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{
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//LOG_TRACE(log, "Disconnecting (" << getServerAddress() << ")");
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socket.close();
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in = NULL;
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out = NULL;
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connected = false;
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}
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void Connection::sendHello()
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{
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//LOG_TRACE(log, "Sending hello (" << getServerAddress() << ")");
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writeVarUInt(Protocol::Client::Hello, *out);
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writeStringBinary((DBMS_NAME " ") + client_name, *out);
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writeVarUInt(DBMS_VERSION_MAJOR, *out);
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writeVarUInt(DBMS_VERSION_MINOR, *out);
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writeVarUInt(Revision::get(), *out);
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writeStringBinary(default_database, *out);
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writeStringBinary(user, *out);
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writeStringBinary(password, *out);
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out->next();
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}
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void Connection::receiveHello()
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{
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//LOG_TRACE(log, "Receiving hello (" << getServerAddress() << ")");
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/// Получить hello пакет.
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UInt64 packet_type = 0;
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readVarUInt(packet_type, *in);
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if (packet_type == Protocol::Server::Hello)
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{
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readStringBinary(server_name, *in);
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readVarUInt(server_version_major, *in);
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readVarUInt(server_version_minor, *in);
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readVarUInt(server_revision, *in);
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/// Старые ревизии сервера не поддерживают имя пользователя и пароль, которые были отправлены в пакете hello.
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if (server_revision < DBMS_MIN_REVISION_WITH_USER_PASSWORD)
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throw Exception("Server revision is too old for this client. You must update server to at least " + toString(DBMS_MIN_REVISION_WITH_USER_PASSWORD) + ".",
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ErrorCodes::SERVER_REVISION_IS_TOO_OLD);
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}
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else if (packet_type == Protocol::Server::Exception)
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receiveException()->rethrow();
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else
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{
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/// Закроем соединение, чтобы не было рассинхронизации.
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disconnect();
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throw Exception("Unexpected packet from server " + getServerAddress() + " (expected Hello or Exception, got "
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+ String(Protocol::Server::toString(packet_type)) + ")", ErrorCodes::UNEXPECTED_PACKET_FROM_SERVER);
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}
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}
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void Connection::getServerVersion(String & name, UInt64 & version_major, UInt64 & version_minor, UInt64 & revision)
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{
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if (!connected)
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connect();
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name = server_name;
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version_major = server_version_major;
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version_minor = server_version_minor;
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revision = server_revision;
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}
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void Connection::forceConnected()
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{
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if (!connected)
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{
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connect();
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}
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else if (!ping())
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{
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LOG_TRACE(log, "Connection was closed, will reconnect.");
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connect();
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}
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}
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bool Connection::ping()
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{
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//LOG_TRACE(log, "Ping (" << getServerAddress() << ")");
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try
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{
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UInt64 pong = 0;
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writeVarUInt(Protocol::Client::Ping, *out);
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out->next();
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if (in->eof())
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return false;
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readVarUInt(pong, *in);
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/// Можем получить запоздалые пакеты прогресса. TODO: может быть, это можно исправить.
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while (pong == Protocol::Server::Progress)
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{
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receiveProgress();
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if (in->eof())
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return false;
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readVarUInt(pong, *in);
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}
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if (pong != Protocol::Server::Pong)
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{
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throw Exception("Unexpected packet from server " + getServerAddress() + " (expected Pong, got "
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+ String(Protocol::Server::toString(pong)) + ")",
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ErrorCodes::UNEXPECTED_PACKET_FROM_SERVER);
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}
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}
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catch (const Poco::Exception & e)
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{
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LOG_TRACE(log, e.displayText());
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return false;
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}
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return true;
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}
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void Connection::sendQuery(const String & query, const String & query_id_, UInt64 stage, const Settings * settings, bool with_pending_data)
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{
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forceConnected();
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query_id = query_id_;
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//LOG_TRACE(log, "Sending query (" << getServerAddress() << ")");
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writeVarUInt(Protocol::Client::Query, *out);
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if (server_revision >= DBMS_MIN_REVISION_WITH_STRING_QUERY_ID)
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writeStringBinary(query_id, *out);
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else
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writeIntBinary<UInt64>(1, *out);
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/// Настройки на отдельный запрос.
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if (server_revision >= DBMS_MIN_REVISION_WITH_PER_QUERY_SETTINGS)
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{
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if (settings)
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settings->serialize(*out);
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else
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writeStringBinary("", *out);
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}
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writeVarUInt(stage, *out);
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writeVarUInt(compression, *out);
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writeStringBinary(query, *out);
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maybe_compressed_in = NULL;
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maybe_compressed_out = NULL;
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block_in = NULL;
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block_out = NULL;
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/// Если версия сервера достаточно новая и стоит флаг, отправляем пустой блок, символизируя конец передачи данных.
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if (server_revision >= DBMS_MIN_REVISION_WITH_TEMPORARY_TABLES && !with_pending_data)
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{
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sendData(Block());
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out->next();
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}
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}
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void Connection::sendCancel()
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{
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//LOG_TRACE(log, "Sending cancel (" << getServerAddress() << ")");
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writeVarUInt(Protocol::Client::Cancel, *out);
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out->next();
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}
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void Connection::sendData(const Block & block, const String & name)
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{
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//LOG_TRACE(log, "Sending data (" << getServerAddress() << ")");
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if (!block_out)
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{
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if (compression == Protocol::Compression::Enable)
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maybe_compressed_out = new CompressedWriteBuffer(*out);
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else
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maybe_compressed_out = out;
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block_out = new NativeBlockOutputStream(*maybe_compressed_out);
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}
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writeVarUInt(Protocol::Client::Data, *out);
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if (server_revision >= DBMS_MIN_REVISION_WITH_TEMPORARY_TABLES)
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writeStringBinary(name, *out);
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block.checkNestedArraysOffsets();
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block_out->write(block);
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maybe_compressed_out->next();
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out->next();
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}
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void Connection::sendExternalTablesData(ExternalTablesData & data)
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{
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/// Если работаем со старым сервером, то никакой информации не отправляем
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if (server_revision < DBMS_MIN_REVISION_WITH_TEMPORARY_TABLES)
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return;
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for (size_t i = 0; i < data.size(); ++i)
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{
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data[i].first->readPrefix();
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while(Block block = data[i].first->read())
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sendData(block, data[i].second);
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data[i].first->readSuffix();
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}
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/// Отправляем пустой блок, символизируя конец передачи данных
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sendData(Block());
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}
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bool Connection::poll(size_t timeout_microseconds)
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{
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return static_cast<ReadBufferFromPocoSocket &>(*in).poll(timeout_microseconds);
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}
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Connection::Packet Connection::receivePacket()
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{
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//LOG_TRACE(log, "Receiving packet (" << getServerAddress() << ")");
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try
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{
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Packet res;
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readVarUInt(res.type, *in);
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switch (res.type)
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{
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case Protocol::Server::Data:
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res.block = receiveData();
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return res;
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case Protocol::Server::Exception:
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res.exception = receiveException();
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return res;
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case Protocol::Server::Progress:
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res.progress = receiveProgress();
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return res;
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case Protocol::Server::ProfileInfo:
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res.profile_info = receiveProfileInfo();
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return res;
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case Protocol::Server::Totals:
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/// Блок с тотальными значениями передаётся так же, как обычный блок данных. Разница только в идентификаторе пакета.
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res.block = receiveData();
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return res;
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case Protocol::Server::Extremes:
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/// Аналогично.
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res.block = receiveData();
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return res;
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case Protocol::Server::EndOfStream:
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return res;
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default:
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/// Закроем соединение, чтобы не было рассинхронизации.
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disconnect();
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throw Exception("Unknown packet "
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+ toString(res.type)
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+ " from server " + getServerAddress(), ErrorCodes::UNKNOWN_PACKET_FROM_SERVER);
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}
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}
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catch (Exception & e)
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{
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/// Дописываем в текст исключения адрес сервера, если надо.
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if (e.code() != ErrorCodes::UNKNOWN_PACKET_FROM_SERVER)
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e.addMessage("while receiving packet from " + getServerAddress());
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throw;
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}
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}
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Block Connection::receiveData()
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{
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//LOG_TRACE(log, "Receiving data (" << getServerAddress() << ")");
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initBlockInput();
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String external_table_name;
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if (server_revision >= DBMS_MIN_REVISION_WITH_TEMPORARY_TABLES)
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readStringBinary(external_table_name, *in);
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/// Прочитать из сети один блок
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return block_in->read();
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}
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void Connection::initBlockInput()
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{
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if (!block_in)
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{
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if (compression == Protocol::Compression::Enable)
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maybe_compressed_in = new CompressedReadBuffer(*in);
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else
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maybe_compressed_in = in;
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block_in = new NativeBlockInputStream(*maybe_compressed_in, data_type_factory);
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}
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}
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String Connection::getServerAddress() const
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{
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return Poco::Net::SocketAddress(host, port).toString();
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}
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SharedPtr<Exception> Connection::receiveException()
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{
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//LOG_TRACE(log, "Receiving exception (" << getServerAddress() << ")");
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Exception e;
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readException(e, *in, "Received from " + getServerAddress());
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return e.clone();
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}
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Progress Connection::receiveProgress()
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{
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//LOG_TRACE(log, "Receiving progress (" << getServerAddress() << ")");
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Progress progress;
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progress.read(*in);
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return progress;
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}
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BlockStreamProfileInfo Connection::receiveProfileInfo()
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{
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BlockStreamProfileInfo profile_info;
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profile_info.read(*in);
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return profile_info;
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}
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}
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