88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2025-03-08
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#pragma once
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#include <maxscale/ccdefs.hh>
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#include <deque>
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#include <maxbase/poll.h>
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#include <maxscale/buffer.hh>
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#include <maxscale/service.hh>
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#include <maxscale/protocol/mysql.hh>
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/** A DCB-like client abstraction which ignores responses */
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class LocalClient : public MXB_POLL_DATA
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{
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LocalClient(const LocalClient&);
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LocalClient& operator=(const LocalClient&);
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public:
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~LocalClient();
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/**
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* Create a local client for a service
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*
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* @param session Client session
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* @param service Service to connect to
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*
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* @return New virtual client or NULL on error
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*/
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static LocalClient* create(MYSQL_session* session, MySQLProtocol* proto, SERVICE* service);
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static LocalClient* create(MYSQL_session* session, MySQLProtocol* proto, SERVER* server);
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/**
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* Queue a new query for execution
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*
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* @param buffer Buffer containing the query
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*
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* @return True if query was successfully queued
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*/
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bool queue_query(GWBUF* buffer);
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/**
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* Destroy the client by sending a COM_QUIT to the backend
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*
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* @note After calling this function, object must be treated as a deleted object
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*/
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void self_destruct();
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private:
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static LocalClient* create(MYSQL_session* session, MySQLProtocol* proto, const char* ip, uint64_t port);
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LocalClient(MYSQL_session* session, MySQLProtocol* proto, int fd);
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static uint32_t poll_handler(MXB_POLL_DATA* data, MXB_WORKER* worker, uint32_t events);
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void process(uint32_t events);
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GWBUF* read_complete_packet();
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void drain_queue();
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void error();
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void close();
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/** Client states */
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enum vc_state
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{
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VC_WAITING_HANDSHAKE, // Initial state
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VC_RESPONSE_SENT, // Handshake received and response sent
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VC_OK, // Authentication is complete, ready for queries
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VC_ERROR // Something went wrong
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};
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vc_state m_state;
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int m_sock;
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mxs::Buffer m_partial;
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size_t m_expected_bytes;
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std::deque<mxs::Buffer> m_queue;
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MYSQL_session m_client;
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MySQLProtocol m_protocol;
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bool m_self_destruct;
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};
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