87 lines
2.4 KiB
C++
87 lines
2.4 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: 2024-06-02
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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 "cat.hh"
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#include <maxscale/protocol/rwbackend.hh>
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class Cat;
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/**
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* The client session structure used within this router.
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*/
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class CatSession : public mxs::RouterSession
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{
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CatSession(const CatSession&) = delete;
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CatSession& operator=(const CatSession&) = delete;
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public:
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CatSession(MXS_SESSION* session, Cat* router, mxs::SRWBackendList& backends);
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/**
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* The RouterSession instance will be deleted when a client session
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* has terminated. Will be called only after @c close() has been called.
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*/
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~CatSession();
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/**
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* Called when a client session has been closed.
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*/
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void close();
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/**
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* Called when a packet being is routed to the backend. The router should
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* forward the packet to the appropriate server(s).
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*
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* @param pPacket A client packet.
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*/
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int32_t routeQuery(GWBUF* pPacket);
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/**
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* Called when a packet is routed to the client. The router should
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* forward the packet to the client using `MXS_SESSION_ROUTE_REPLY`.
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*
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* @param pPacket A client packet.
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* @param pBackend The backend the packet is coming from.
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*/
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void clientReply(GWBUF* pPacket, DCB* pBackend);
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/**
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*
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* @param pMessage The error message.
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* @param pProblem The DCB on which the error occurred.
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* @param action The context.
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* @param pSuccess On output, if false, the session will be terminated.
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*/
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void handleError(GWBUF* pMessage,
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DCB* pProblem,
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mxs_error_action_t action,
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bool* pSuccess);
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private:
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MXS_SESSION* m_session;
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mxs::SRWBackendList m_backends;
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uint64_t m_completed;
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uint8_t m_packet_num;
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mxs::SRWBackendList::iterator m_current;
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GWBUF* m_query;
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/**
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* Iterate to next backend
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*
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* @return True if m_current points to a valid backend that is in use
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*/
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bool next_backend();
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};
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