0c45eb5d17
Readwritesplit now uses the SessionCommand class as a "master list" of executed session commands. This allows the session commands to be easily copied over to slaves that are taken into use after session commands have already been executed. Currently, the code doesn't execute the session command history when a mid-session reconnection occurs. A method to cleanly copy the session commands needs to be exposed by the Backend class.
106 lines
4.5 KiB
C++
106 lines
4.5 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 <maxscale/query_classifier.h>
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#include <maxscale/protocol/mysql.h>
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#include "readwritesplit.hh"
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#define RW_CHK_DCB(b, d) \
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do{ \
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if(d->state == DCB_STATE_DISCONNECTED){ \
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MXS_NOTICE("DCB was closed on line %d and another attempt to close it is made on line %d." , \
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(b) ? (b)->closed_at : -1, __LINE__); \
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} \
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}while (false)
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#define RW_CLOSE_BREF(b) do{ if (b){ (b)->closed_at = __LINE__; } } while (false)
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/*
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* The following are implemented in rwsplit_mysql.c
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*/
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bool route_single_stmt(ROUTER_INSTANCE *inst, ROUTER_CLIENT_SES *rses,
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GWBUF *querybuf);
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void closed_session_reply(GWBUF *querybuf);
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void print_error_packet(ROUTER_CLIENT_SES *rses, GWBUF *buf, DCB *dcb);
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void check_session_command_reply(GWBUF *writebuf, SRWBackend bref);
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bool execute_sescmd_in_backend(SRWBackend& backend_ref);
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bool handle_target_is_all(route_target_t route_target,
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ROUTER_INSTANCE *inst, ROUTER_CLIENT_SES *rses,
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GWBUF *querybuf, int packet_type, uint32_t qtype);
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uint8_t determine_packet_type(GWBUF *querybuf, bool *non_empty_packet);
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void log_transaction_status(ROUTER_CLIENT_SES *rses, GWBUF *querybuf, uint32_t qtype);
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bool command_will_respond(uint8_t packet_type);
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bool is_packet_a_query(int packet_type);
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bool send_readonly_error(DCB *dcb);
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/*
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* The following are implemented in readwritesplit.c
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*/
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int router_handle_state_switch(DCB *dcb, DCB_REASON reason, void *data);
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SRWBackend& get_bref_from_dcb(ROUTER_CLIENT_SES *rses, DCB *dcb);
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int rses_get_max_slavecount(ROUTER_CLIENT_SES *rses);
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int rses_get_max_replication_lag(ROUTER_CLIENT_SES *rses);
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/*
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* The following are implemented in rwsplit_route_stmt.c
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*/
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bool route_single_stmt(ROUTER_INSTANCE *inst, ROUTER_CLIENT_SES *rses,
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GWBUF *querybuf);
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bool get_target_backend(ROUTER_CLIENT_SES *rses, backend_type_t btype,
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char *name, int max_rlag, SRWBackend& target);
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route_target_t get_route_target(ROUTER_CLIENT_SES *rses,
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uint32_t qtype, HINT *hint);
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void handle_multi_temp_and_load(ROUTER_CLIENT_SES *rses, GWBUF *querybuf,
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uint8_t packet_type, uint32_t *qtype);
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bool handle_hinted_target(ROUTER_CLIENT_SES *rses, GWBUF *querybuf,
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route_target_t route_target, SRWBackend& target);
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bool handle_slave_is_target(ROUTER_INSTANCE *inst, ROUTER_CLIENT_SES *rses,
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SRWBackend& target);
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bool handle_master_is_target(ROUTER_INSTANCE *inst, ROUTER_CLIENT_SES *rses,
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SRWBackend& target);
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bool handle_got_target(ROUTER_INSTANCE *inst, ROUTER_CLIENT_SES *rses,
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GWBUF *querybuf, SRWBackend& target, bool store);
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bool route_session_write(ROUTER_CLIENT_SES *rses, GWBUF *querybuf, uint8_t command);
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void process_sescmd_response(ROUTER_CLIENT_SES* rses, SRWBackend& bref,
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GWBUF** ppPacket, bool* reconnect);
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/*
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* The following are implemented in rwsplit_select_backends.c
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*/
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bool select_connect_backend_servers(int router_nservers,
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int max_nslaves,
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select_criteria_t select_criteria,
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MXS_SESSION *session,
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ROUTER_INSTANCE *router,
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ROUTER_CLIENT_SES *rses,
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bool active_session);
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/*
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* The following are implemented in rwsplit_tmp_table_multi.c
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*/
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void check_drop_tmp_table(ROUTER_CLIENT_SES *router_cli_ses, GWBUF *querybuf);
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bool is_read_tmp_table(ROUTER_CLIENT_SES *router_cli_ses,
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GWBUF *querybuf,
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uint32_t type);
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void check_create_tmp_table(ROUTER_CLIENT_SES *router_cli_ses,
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GWBUF *querybuf, uint32_t type);
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bool check_for_multi_stmt(GWBUF *buf, void *protocol, uint8_t packet_type);
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uint32_t determine_query_type(GWBUF *querybuf, int packet_type, bool non_empty_packet);
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void close_all_connections(ROUTER_CLIENT_SES* rses);
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