28609a2c77
With the removal of the old session command implementation, the code that used it can be removed or replaced with newer constructs. As a result, the backend protocol no longer does any session command processing. The three buffer types, GWBUF_TYPE_SESCMD_RESPONSE, GWBUF_TYPE_RESPONSE_END and GWBUF_TYPE_SESCMD as well as their related macros are no longer used and can be removed.
148 lines
4.9 KiB
C++
148 lines
4.9 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: 2022-01-01
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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 "rwsplitsession.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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using namespace maxscale;
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/**
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* Functions for session command handling
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*/
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static std::string extract_error(GWBUF* buffer)
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{
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std::string rval;
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if (MYSQL_IS_ERROR_PACKET(((uint8_t *)GWBUF_DATA(buffer))))
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{
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size_t replylen = MYSQL_GET_PAYLOAD_LEN(GWBUF_DATA(buffer));
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char replybuf[replylen];
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gwbuf_copy_data(buffer, 0, gwbuf_length(buffer), (uint8_t*)replybuf);
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std::string err;
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std::string msg;
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err.append(replybuf + 8, 5);
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msg.append(replybuf + 13, replylen - 4 - 5);
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rval = err + ": " + msg;
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}
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return rval;
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}
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/**
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* Discards the slave connection if its response differs from the master's response
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*
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* @param backend The slave Backend
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* @param master_cmd Master's reply
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* @param slave_cmd Slave's reply
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*/
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static void discard_if_response_differs(SRWBackend backend, uint8_t master_response,
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uint8_t slave_response, SSessionCommand sescmd)
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{
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if (master_response != slave_response)
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{
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uint8_t cmd = sescmd->get_command();
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std::string query = sescmd->to_string();
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MXS_WARNING("Slave server '%s': response (0x%02hhx) differs "
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"from master's response (0x%02hhx) to %s: `%s`. "
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"Closing slave connection due to inconsistent session state.",
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backend->name(), slave_response, master_response, STRPACKETTYPE(cmd),
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query.empty() ? "<no query>" : query.c_str());
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backend->close(mxs::Backend::CLOSE_FATAL);
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}
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}
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void RWSplitSession::process_sescmd_response(SRWBackend& backend, GWBUF** ppPacket)
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{
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if (backend->has_session_commands())
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{
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ss_dassert(GWBUF_IS_COLLECTED_RESULT(*ppPacket));
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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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mxs::SSessionCommand sescmd = backend->next_session_command();
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uint64_t id = backend->complete_session_command();
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MXS_PS_RESPONSE resp = {};
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bool discard = true;
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if (command == MXS_COM_STMT_PREPARE && cmd != MYSQL_REPLY_ERR)
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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 (m_recv_sescmd < m_sent_sescmd && id == m_recv_sescmd + 1)
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{
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if (!m_current_master || !m_current_master->in_use() || // Session doesn't have a master
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m_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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++m_recv_sescmd;
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discard = false;
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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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m_sescmd_responses[id] = cmd;
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if (cmd == MYSQL_REPLY_ERR)
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{
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MXS_INFO("Session command no. %lu failed: %s",
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id, extract_error(*ppPacket).c_str());
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}
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else if (command == MXS_COM_STMT_PREPARE)
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{
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/** Map the returned response to the internal ID */
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MXS_INFO("PS ID %u maps to internal ID %lu", resp.id, id);
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m_qc.ps_id_internal_put(resp.id, id);
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}
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// Discard any slave connections that did not return the same result
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for (SlaveResponseList::iterator it = m_slave_responses.begin();
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it != m_slave_responses.end(); it++)
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{
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discard_if_response_differs(it->first, cmd, it->second, sescmd);
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}
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m_slave_responses.clear();
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}
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else
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{
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/** Record slave command so that the response can be validated
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* against the master's response when it arrives. */
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m_slave_responses.push_back(std::make_pair(backend, cmd));
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}
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}
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else
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{
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discard_if_response_differs(backend, m_sescmd_responses[id], cmd, sescmd);
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}
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if (discard)
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{
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gwbuf_free(*ppPacket);
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*ppPacket = NULL;
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}
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}
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}
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