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.
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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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 "readwritesplit.hh"
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#include "rwsplit_internal.hh"
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#include <stdio.h>
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#include <strings.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <maxscale/router.h>
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/**
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* Functions for session command handling
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*/
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void process_sescmd_response(ROUTER_CLIENT_SES* rses, SRWBackend& bref, GWBUF** ppPacket, bool* reconnect)
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{
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if (bref->session_command_count())
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{
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/** We are executing a session command */
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if (GWBUF_IS_TYPE_SESCMD_RESPONSE((*ppPacket)))
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{
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uint8_t cmd;
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gwbuf_copy_data(*ppPacket, MYSQL_HEADER_LEN, 1, &cmd);
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uint64_t id = bref->complete_session_command();
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if (rses->recv_sescmd < rses->sent_sescmd &&
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id == rses->recv_sescmd + 1 &&
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(!rses->current_master || // Session doesn't have a master
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rses->current_master == bref)) // This is the master's response
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{
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/** First reply to this session command, route it to the client */
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++rses->recv_sescmd;
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/** Store the master's response so that the slave responses can
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* be compared to it */
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rses->sescmd_responses[id] = cmd;
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}
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else
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{
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/** The reply to this session command has already been sent to
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* the client, discard it */
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gwbuf_free(*ppPacket);
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*ppPacket = NULL;
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if (rses->sescmd_responses[id] != cmd)
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{
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MXS_ERROR("Slave server '%s': response differs from master's response. "
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"Closing connection due to inconsistent session state.",
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bref->server()->unique_name);
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bref->close(mxs::Backend::CLOSE_FATAL);
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*reconnect = true;
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}
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}
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}
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}
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}
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