77f78c4b20
Mapping the handles returned to the client to a session command ID allows the mapping of client handle to the backend specific handle. Currently, the mapping is used for diagnostic output only.
88 lines
2.9 KiB
C++
88 lines
2.9 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& backend,
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GWBUF** ppPacket, bool* pReconnect)
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{
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if (backend->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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uint8_t command = backend->next_session_command()->get_command();
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uint64_t id = backend->complete_session_command();
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MXS_PS_RESPONSE resp = {};
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if (command == MYSQL_COM_STMT_PREPARE)
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{
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// This should never fail or the backend protocol is broken
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ss_debug(bool b = )mxs_mysql_extract_ps_response(*ppPacket, &resp);
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ss_dassert(b);
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backend->add_ps_handle(id, resp.id);
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}
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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 == backend)) // 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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if (command == MYSQL_COM_STMT_PREPARE)
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{
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/** Map the returned response to the internal ID */
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rses->ps_handles[resp.id] = id;
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}
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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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backend->name());
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backend->close(mxs::Backend::CLOSE_FATAL);
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*pReconnect = 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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