4dd6842447
KILL commands are now sent to the backends in an asynchronous manner. As the LocalClient class is used to connect to the servers, this will cause an extra connection to be created on top of the original connections created by the session. If the user does not have the permissions to execute the KILL, the error message is currently lost. This could be solved by adding a "result handler" into the LocalClient class which is called with the result.
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
#pragma once
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/*
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* Copyright (c) 2016 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: 2020-01-01
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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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#include <maxscale/cppdefs.hh>
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#include <deque>
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#include <maxscale/buffer.hh>
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#include <maxscale/service.h>
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#include <maxscale/protocol/mysql.h>
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/** A DCB-like client abstraction which ignores responses */
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class LocalClient: public MXS_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(MXS_SESSION* session, SERVICE* service);
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static LocalClient* create(MXS_SESSION* session, 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(MXS_SESSION* session, const char* ip, uint64_t port);
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LocalClient(MXS_SESSION* session, int fd);
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static uint32_t poll_handler(struct mxs_poll_data* data, int wid, 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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