1157 lines
34 KiB
C++
1157 lines
34 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: 2024-03-10
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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/queryclassifier.hh>
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#include <unordered_map>
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#include <maxbase/alloc.h>
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#include <maxscale/modutil.hh>
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#include <maxscale/query_classifier.hh>
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#include <maxscale/protocol/mysql.hh>
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namespace
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{
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using namespace maxscale;
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const int QC_TRACE_MSG_LEN = 1000;
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// Copy of mxs_mysql_extract_ps_id() in modules/protocol/MySQL/mysql_common.cc,
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// but we do not want to create a dependency from maxscale-common to that.
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uint32_t mysql_extract_ps_id(GWBUF* buffer)
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{
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uint32_t rval = 0;
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uint8_t id[MYSQL_PS_ID_SIZE];
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if (gwbuf_copy_data(buffer, MYSQL_PS_ID_OFFSET, sizeof(id), id) == sizeof(id))
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{
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rval = gw_mysql_get_byte4(id);
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}
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return rval;
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}
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// Copied from mysql_common.c
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// TODO: The current database should somehow be available in a generic fashion.
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const char* qc_mysql_get_current_db(MXS_SESSION* session)
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{
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MYSQL_session* data = (MYSQL_session*)session->client_dcb->data;
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return data->db;
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}
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// Copied from mysql_common.c
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bool qc_mysql_is_ps_command(uint8_t cmd)
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{
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return cmd == MXS_COM_STMT_EXECUTE
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|| cmd == MXS_COM_STMT_BULK_EXECUTE
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|| cmd == MXS_COM_STMT_SEND_LONG_DATA
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|| cmd == MXS_COM_STMT_CLOSE
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|| cmd == MXS_COM_STMT_FETCH
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|| cmd == MXS_COM_STMT_RESET;
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}
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// Copied from mysql_common.cc
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uint32_t qc_mysql_extract_ps_id(GWBUF* buffer)
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{
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uint32_t rval = 0;
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uint8_t id[MYSQL_PS_ID_SIZE];
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if (gwbuf_copy_data(buffer, MYSQL_PS_ID_OFFSET, sizeof(id), id) == sizeof(id))
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{
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rval = gw_mysql_get_byte4(id);
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}
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return rval;
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}
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uint16_t qc_extract_ps_param_count(GWBUF* buffer)
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{
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uint16_t rval = 0;
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uint8_t params[MYSQL_PS_PARAMS_SIZE];
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if (gwbuf_copy_data(buffer, MYSQL_PS_PARAMS_OFFSET, sizeof(params), params) == sizeof(params))
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{
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rval = gw_mysql_get_byte2(params);
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}
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return rval;
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}
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bool have_semicolon(const char* ptr, int len)
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{
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for (int i = 0; i < len; i++)
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{
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if (ptr[i] == ';')
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{
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return true;
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}
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}
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return false;
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}
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bool is_packet_a_query(int packet_type)
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{
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return packet_type == MXS_COM_QUERY;
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}
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bool check_for_sp_call(GWBUF* buf, uint8_t packet_type)
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{
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return packet_type == MXS_COM_QUERY && qc_get_operation(buf) == QUERY_OP_CALL;
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}
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bool are_multi_statements_allowed(MXS_SESSION* pSession)
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{
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MySQLProtocol* pPcol = static_cast<MySQLProtocol*>(pSession->client_dcb->protocol);
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if (pPcol->client_capabilities & GW_MYSQL_CAPABILITIES_MULTI_STATEMENTS)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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uint32_t get_prepare_type(GWBUF* buffer)
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{
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uint32_t type = QUERY_TYPE_UNKNOWN;
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if (mxs_mysql_get_command(buffer) == MXS_COM_STMT_PREPARE)
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{
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// TODO: This could be done inside the query classifier
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size_t packet_len = gwbuf_length(buffer);
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size_t payload_len = packet_len - MYSQL_HEADER_LEN;
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GWBUF* stmt = gwbuf_alloc(packet_len);
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uint8_t* ptr = GWBUF_DATA(stmt);
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// Payload length
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*ptr++ = payload_len;
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*ptr++ = (payload_len >> 8);
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*ptr++ = (payload_len >> 16);
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// Sequence id
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*ptr++ = 0x00;
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// Command
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*ptr++ = MXS_COM_QUERY;
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gwbuf_copy_data(buffer, MYSQL_HEADER_LEN + 1, payload_len - 1, ptr);
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type = qc_get_type_mask(stmt);
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gwbuf_free(stmt);
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}
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else
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{
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GWBUF* stmt = qc_get_preparable_stmt(buffer);
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if (stmt)
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{
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type = qc_get_type_mask(stmt);
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}
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}
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return type;
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}
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std::string get_text_ps_id(GWBUF* buffer)
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{
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std::string rval;
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char* name = qc_get_prepare_name(buffer);
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if (name)
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{
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rval = name;
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MXS_FREE(name);
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}
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return rval;
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}
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bool foreach_table(QueryClassifier& qc,
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MXS_SESSION* pSession,
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GWBUF* querybuf,
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bool (* func)(QueryClassifier& qc, const std::string&))
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{
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bool rval = true;
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int n_tables;
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char** tables = qc_get_table_names(querybuf, &n_tables, true);
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for (int i = 0; i < n_tables; i++)
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{
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const char* db = qc_mysql_get_current_db(pSession);
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std::string table;
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if (strchr(tables[i], '.') == NULL)
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{
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table += db;
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table += ".";
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}
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table += tables[i];
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if (!func(qc, table))
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{
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rval = false;
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break;
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}
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}
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if (tables)
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{
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for (int i = 0; i < n_tables; i++)
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{
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MXS_FREE(tables[i]);
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}
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MXS_FREE(tables);
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}
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return rval;
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}
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}
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namespace maxscale
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{
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QueryClassifier::RouteInfo::RouteInfo()
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: m_target(QueryClassifier::TARGET_UNDEFINED)
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, m_command(0xff)
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, m_type_mask(QUERY_TYPE_UNKNOWN)
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, m_stmt_id(0)
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{
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}
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QueryClassifier::RouteInfo::RouteInfo(uint32_t target,
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uint8_t command,
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uint32_t type_mask,
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uint32_t stmt_id)
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: m_target(target)
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, m_command(command)
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, m_type_mask(type_mask)
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, m_stmt_id(stmt_id)
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{
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}
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void QueryClassifier::RouteInfo::reset()
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{
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m_target = QueryClassifier::TARGET_UNDEFINED;
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m_command = 0xff;
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m_type_mask = QUERY_TYPE_UNKNOWN;
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m_stmt_id = 0;
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}
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class QueryClassifier::PSManager
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{
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PSManager(const PSManager&) = delete;
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PSManager& operator=(const PSManager&) = delete;
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public:
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PSManager()
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{
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}
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~PSManager()
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{
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}
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void store(GWBUF* buffer, uint32_t id)
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{
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mxb_assert(mxs_mysql_get_command(buffer) == MXS_COM_STMT_PREPARE
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|| qc_query_is_type(qc_get_type_mask(buffer),
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QUERY_TYPE_PREPARE_NAMED_STMT));
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switch (mxs_mysql_get_command(buffer))
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{
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case MXS_COM_QUERY:
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m_text_ps[get_text_ps_id(buffer)] = get_prepare_type(buffer);
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break;
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case MXS_COM_STMT_PREPARE:
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m_binary_ps[id].type = get_prepare_type(buffer);
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break;
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default:
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mxb_assert(!true);
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break;
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}
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}
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uint32_t get_type(uint32_t id) const
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{
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uint32_t rval = QUERY_TYPE_UNKNOWN;
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BinaryPSMap::const_iterator it = m_binary_ps.find(id);
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if (it != m_binary_ps.end())
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{
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rval = it->second.type;
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}
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else
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{
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MXS_WARNING("Using unknown prepared statement with ID %u", id);
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}
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return rval;
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}
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uint32_t get_type(std::string id) const
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{
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uint32_t rval = QUERY_TYPE_UNKNOWN;
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TextPSMap::const_iterator it = m_text_ps.find(id);
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if (it != m_text_ps.end())
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{
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rval = it->second;
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}
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else
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{
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MXS_WARNING("Using unknown prepared statement with ID '%s'", id.c_str());
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}
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return rval;
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}
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void erase(std::string id)
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{
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if (m_text_ps.erase(id) == 0)
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{
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MXS_WARNING("Closing unknown prepared statement with ID '%s'", id.c_str());
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}
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}
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void erase(uint32_t id)
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{
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if (m_binary_ps.erase(id) == 0)
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{
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MXS_WARNING("Closing unknown prepared statement with ID %u", id);
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}
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}
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void erase(GWBUF* buffer)
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{
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uint8_t cmd = mxs_mysql_get_command(buffer);
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if (cmd == MXS_COM_QUERY)
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{
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erase(get_text_ps_id(buffer));
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}
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else if (qc_mysql_is_ps_command(cmd))
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{
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erase(mysql_extract_ps_id(buffer));
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}
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else
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{
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mxb_assert_message(!true, "QueryClassifier::PSManager::erase called with invalid query");
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}
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}
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void set_param_count(uint32_t id, uint16_t param_count)
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{
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m_binary_ps[id].param_count = param_count;
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}
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uint16_t param_count(uint32_t id) const
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{
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uint16_t rval = 0;
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auto it = m_binary_ps.find(id);
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if (it != m_binary_ps.end())
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{
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rval = it->second.param_count;
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}
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return rval;
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}
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private:
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struct BinaryPS
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{
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uint32_t type = 0;
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uint16_t param_count = 0;
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};
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typedef std::unordered_map<uint32_t, BinaryPS> BinaryPSMap;
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typedef std::unordered_map<std::string, uint32_t> TextPSMap;
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private:
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BinaryPSMap m_binary_ps;
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TextPSMap m_text_ps;
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};
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//
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// QueryClassifier
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//
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QueryClassifier::QueryClassifier(Handler* pHandler,
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MXS_SESSION* pSession,
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mxs_target_t use_sql_variables_in)
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: m_pHandler(pHandler)
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, m_pSession(pSession)
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, m_use_sql_variables_in(use_sql_variables_in)
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, m_load_data_state(LOAD_DATA_INACTIVE)
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, m_load_data_sent(0)
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, m_have_tmp_tables(false)
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, m_large_query(false)
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, m_multi_statements_allowed(are_multi_statements_allowed(pSession))
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, m_sPs_manager(new PSManager)
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, m_trx_is_read_only(true)
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, m_ps_continuation(false)
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{
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}
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void QueryClassifier::ps_store(GWBUF* pBuffer, uint32_t id)
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{
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return m_sPs_manager->store(pBuffer, id);
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}
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uint32_t QueryClassifier::ps_get_type(uint32_t id) const
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{
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return m_sPs_manager->get_type(id);
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}
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uint32_t QueryClassifier::ps_get_type(std::string id) const
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{
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return m_sPs_manager->get_type(id);
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}
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void QueryClassifier::ps_erase(GWBUF* buffer)
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{
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if (qc_mysql_is_ps_command(mxs_mysql_get_command(buffer)))
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{
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// Erase the type of the statement stored with the internal ID
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m_sPs_manager->erase(ps_id_internal_get(buffer));
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// ... and then erase the external to internal ID mapping
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m_ps_handles.erase(qc_mysql_extract_ps_id(buffer));
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}
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else
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{
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// Not a PS command, we don't need the ID mapping
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m_sPs_manager->erase(buffer);
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}
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}
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bool QueryClassifier::query_type_is_read_only(uint32_t qtype) const
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{
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bool rval = false;
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if (!qc_query_is_type(qtype, QUERY_TYPE_MASTER_READ)
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&& !qc_query_is_type(qtype, QUERY_TYPE_WRITE)
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&& (qc_query_is_type(qtype, QUERY_TYPE_READ)
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|| qc_query_is_type(qtype, QUERY_TYPE_SHOW_TABLES)
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|| qc_query_is_type(qtype, QUERY_TYPE_SHOW_DATABASES)
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|| qc_query_is_type(qtype, QUERY_TYPE_USERVAR_READ)
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|| qc_query_is_type(qtype, QUERY_TYPE_SYSVAR_READ)
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|| qc_query_is_type(qtype, QUERY_TYPE_GSYSVAR_READ)))
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{
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if (qc_query_is_type(qtype, QUERY_TYPE_USERVAR_READ))
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{
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if (m_use_sql_variables_in == TYPE_ALL)
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{
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rval = true;
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}
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}
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else
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{
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rval = true;
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}
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}
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return rval;
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}
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void QueryClassifier::process_routing_hints(HINT* pHints, uint32_t* target)
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{
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HINT* pHint = pHints;
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while (pHint)
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{
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if (m_pHandler->supports_hint(pHint->type))
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{
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switch (pHint->type)
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{
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case HINT_ROUTE_TO_MASTER:
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// This means override, so we bail out immediately.
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*target = TARGET_MASTER;
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MXS_DEBUG("Hint: route to master");
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pHint = NULL;
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break;
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case HINT_ROUTE_TO_NAMED_SERVER:
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// The router is expected to look up the named server.
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*target |= TARGET_NAMED_SERVER;
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MXS_DEBUG("Hint: route to named server: %s", (char*)pHint->data);
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break;
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case HINT_ROUTE_TO_UPTODATE_SERVER:
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// TODO: Add generic target type, never to be seem by RWS.
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mxb_assert(false);
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break;
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case HINT_ROUTE_TO_ALL:
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// TODO: Add generic target type, never to be seem by RWS.
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mxb_assert(false);
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break;
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case HINT_ROUTE_TO_LAST_USED:
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MXS_DEBUG("Hint: route to last used");
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*target = TARGET_LAST_USED;
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break;
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case HINT_PARAMETER:
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if (strncasecmp((char*)pHint->data,
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"max_slave_replication_lag",
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strlen("max_slave_replication_lag")) == 0)
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{
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*target |= TARGET_RLAG_MAX;
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}
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else
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{
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MXS_ERROR("Unknown hint parameter '%s' when "
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"'max_slave_replication_lag' was expected.",
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(char*)pHint->data);
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}
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break;
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case HINT_ROUTE_TO_SLAVE:
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*target = TARGET_SLAVE;
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MXS_DEBUG("Hint: route to slave.");
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}
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}
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if (pHint)
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{
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pHint = pHint->next;
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}
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}
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}
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uint32_t QueryClassifier::get_route_target(uint8_t command, uint32_t qtype)
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{
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bool trx_active = session_trx_is_active(m_pSession);
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uint32_t target = TARGET_UNDEFINED;
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bool load_active = (m_load_data_state != LOAD_DATA_INACTIVE);
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/**
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* Prepared statements preparations should go to all servers
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*/
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if (qc_query_is_type(qtype, QUERY_TYPE_PREPARE_STMT)
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|| qc_query_is_type(qtype, QUERY_TYPE_PREPARE_NAMED_STMT)
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|| command == MXS_COM_STMT_CLOSE
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|| command == MXS_COM_STMT_RESET)
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{
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target = TARGET_ALL;
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}
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/**
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* These queries should be routed to all servers
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*/
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else if (!load_active
|
|
&& (qc_query_is_type(qtype, QUERY_TYPE_SESSION_WRITE)
|
|
|| /** Configured to allow writing user variables to all nodes */
|
|
(m_use_sql_variables_in == TYPE_ALL
|
|
&& qc_query_is_type(qtype, QUERY_TYPE_USERVAR_WRITE))
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_GSYSVAR_WRITE)
|
|
|| /** enable or disable autocommit are always routed to all */
|
|
qc_query_is_type(qtype, QUERY_TYPE_ENABLE_AUTOCOMMIT)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_DISABLE_AUTOCOMMIT)))
|
|
{
|
|
/**
|
|
* This is problematic query because it would be routed to all
|
|
* backends but since this is SELECT that is not possible:
|
|
* 1. response set is not handled correctly in clientReply and
|
|
* 2. multiple results can degrade performance.
|
|
*
|
|
* Prepared statements are an exception to this since they do not
|
|
* actually do anything but only prepare the statement to be used.
|
|
* They can be safely routed to all backends since the execution
|
|
* is done later.
|
|
*
|
|
* With prepared statement caching the task of routing
|
|
* the execution of the prepared statements to the right server would be
|
|
* an easy one. Currently this is not supported.
|
|
*/
|
|
if (qc_query_is_type(qtype, QUERY_TYPE_READ))
|
|
{
|
|
MXS_WARNING("The query can't be routed to all "
|
|
"backend servers because it includes SELECT and "
|
|
"SQL variable modifications which is not supported. "
|
|
"Set use_sql_variables_in=master or split the "
|
|
"query to two, where SQL variable modifications "
|
|
"are done in the first and the SELECT in the "
|
|
"second one.");
|
|
|
|
target = TARGET_MASTER;
|
|
}
|
|
target |= TARGET_ALL;
|
|
}
|
|
/**
|
|
* Hints may affect on routing of the following queries
|
|
*/
|
|
else if (!trx_active && !load_active && query_type_is_read_only(qtype))
|
|
{
|
|
target = TARGET_SLAVE;
|
|
}
|
|
else if (session_trx_is_read_only(m_pSession))
|
|
{
|
|
/* Force TARGET_SLAVE for READ ONLY transaction (active or ending) */
|
|
target = TARGET_SLAVE;
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(trx_active || load_active
|
|
|| (qc_query_is_type(qtype, QUERY_TYPE_WRITE)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_MASTER_READ)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_SESSION_WRITE)
|
|
|| (qc_query_is_type(qtype, QUERY_TYPE_USERVAR_READ)
|
|
&& m_use_sql_variables_in == TYPE_MASTER)
|
|
|| (qc_query_is_type(qtype, QUERY_TYPE_SYSVAR_READ)
|
|
&& m_use_sql_variables_in == TYPE_MASTER)
|
|
|| (qc_query_is_type(qtype, QUERY_TYPE_GSYSVAR_READ)
|
|
&& m_use_sql_variables_in == TYPE_MASTER)
|
|
|| (qc_query_is_type(qtype, QUERY_TYPE_GSYSVAR_WRITE)
|
|
&& m_use_sql_variables_in == TYPE_MASTER)
|
|
|| (qc_query_is_type(qtype, QUERY_TYPE_USERVAR_WRITE)
|
|
&& m_use_sql_variables_in == TYPE_MASTER)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_BEGIN_TRX)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_ENABLE_AUTOCOMMIT)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_DISABLE_AUTOCOMMIT)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_ROLLBACK)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_COMMIT)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_EXEC_STMT)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_CREATE_TMP_TABLE)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_READ_TMP_TABLE)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_UNKNOWN))
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_EXEC_STMT));
|
|
|
|
target = TARGET_MASTER;
|
|
}
|
|
|
|
return target;
|
|
}
|
|
|
|
uint32_t QueryClassifier::ps_id_internal_get(GWBUF* pBuffer)
|
|
{
|
|
uint32_t internal_id = 0;
|
|
|
|
// All COM_STMT type statements store the ID in the same place
|
|
uint32_t external_id = mysql_extract_ps_id(pBuffer);
|
|
|
|
if (external_id == 0xffffffff)
|
|
{
|
|
// "Direct execution" that refers to the latest prepared statement
|
|
external_id = m_prev_ps_id;
|
|
}
|
|
|
|
auto it = m_ps_handles.find(external_id);
|
|
|
|
if (it != m_ps_handles.end())
|
|
{
|
|
internal_id = it->second;
|
|
}
|
|
else
|
|
{
|
|
MXS_WARNING("Client requests unknown prepared statement ID '%u' that "
|
|
"does not map to an internal ID",
|
|
external_id);
|
|
}
|
|
|
|
return internal_id;
|
|
}
|
|
|
|
void QueryClassifier::ps_store_response(uint32_t internal_id, GWBUF* buffer)
|
|
{
|
|
auto external_id = qc_mysql_extract_ps_id(buffer);
|
|
m_prev_ps_id = external_id;
|
|
m_ps_handles[external_id] = internal_id;
|
|
|
|
if (auto param_count = qc_extract_ps_param_count(buffer))
|
|
{
|
|
m_sPs_manager->set_param_count(internal_id, param_count);
|
|
}
|
|
}
|
|
|
|
void QueryClassifier::log_transaction_status(GWBUF* querybuf, uint32_t qtype)
|
|
{
|
|
if (large_query())
|
|
{
|
|
MXS_INFO("> Processing large request with more than 2^24 bytes of data");
|
|
}
|
|
else if (load_data_state() == QueryClassifier::LOAD_DATA_INACTIVE)
|
|
{
|
|
uint8_t* packet = GWBUF_DATA(querybuf);
|
|
unsigned char command = packet[4];
|
|
int len = 0;
|
|
std::string sqldata;
|
|
char* sql = (char*)"<non-SQL>";
|
|
char* qtypestr = qc_typemask_to_string(qtype);
|
|
|
|
if (qc_mysql_is_ps_command(command))
|
|
{
|
|
sqldata = "ID: " + std::to_string(mysql_extract_ps_id(querybuf));
|
|
sql = (char*)sqldata.c_str();
|
|
len = sqldata.length();
|
|
}
|
|
else
|
|
{
|
|
modutil_extract_SQL(querybuf, &sql, &len);
|
|
}
|
|
|
|
if (len > QC_TRACE_MSG_LEN)
|
|
{
|
|
len = QC_TRACE_MSG_LEN;
|
|
}
|
|
|
|
MXS_SESSION* ses = session();
|
|
const char* autocommit = session_is_autocommit(ses) ? "[enabled]" : "[disabled]";
|
|
const char* transaction = session_trx_is_active(ses) ? "[open]" : "[not open]";
|
|
uint32_t plen = MYSQL_GET_PACKET_LEN(querybuf);
|
|
const char* querytype = qtypestr == NULL ? "N/A" : qtypestr;
|
|
const char* hint = querybuf->hint == NULL ? "" : ", Hint:";
|
|
const char* hint_type = querybuf->hint == NULL ? "" : STRHINTTYPE(querybuf->hint->type);
|
|
|
|
MXS_INFO("> Autocommit: %s, trx is %s, cmd: (0x%02x) %s, plen: %u, type: %s, stmt: %.*s%s %s",
|
|
autocommit,
|
|
transaction,
|
|
command,
|
|
STRPACKETTYPE(command),
|
|
plen,
|
|
querytype,
|
|
len,
|
|
sql,
|
|
hint,
|
|
hint_type);
|
|
|
|
MXS_FREE(qtypestr);
|
|
}
|
|
else
|
|
{
|
|
MXS_INFO("> Processing LOAD DATA LOCAL INFILE: %lu bytes sent.", load_data_sent());
|
|
}
|
|
}
|
|
|
|
uint32_t QueryClassifier::determine_query_type(GWBUF* querybuf, int command)
|
|
{
|
|
uint32_t type = QUERY_TYPE_UNKNOWN;
|
|
|
|
switch (command)
|
|
{
|
|
case MXS_COM_QUIT: /*< 1 QUIT will close all sessions */
|
|
case MXS_COM_INIT_DB: /*< 2 DDL must go to the master */
|
|
case MXS_COM_REFRESH: /*< 7 - I guess this is session but not sure */
|
|
case MXS_COM_DEBUG: /*< 0d all servers dump debug info to stdout */
|
|
case MXS_COM_PING: /*< 0e all servers are pinged */
|
|
case MXS_COM_CHANGE_USER: /*< 11 all servers change it accordingly */
|
|
case MXS_COM_SET_OPTION: /*< 1b send options to all servers */
|
|
case MXS_COM_RESET_CONNECTION: /*< 1f resets the state of all connections */
|
|
type = QUERY_TYPE_SESSION_WRITE;
|
|
break;
|
|
|
|
case MXS_COM_CREATE_DB: /**< 5 DDL must go to the master */
|
|
case MXS_COM_DROP_DB: /**< 6 DDL must go to the master */
|
|
case MXS_COM_STMT_CLOSE: /*< free prepared statement */
|
|
case MXS_COM_STMT_SEND_LONG_DATA: /*< send data to column */
|
|
case MXS_COM_STMT_RESET: /*< resets the data of a prepared statement */
|
|
type = QUERY_TYPE_WRITE;
|
|
break;
|
|
|
|
case MXS_COM_QUERY:
|
|
type = qc_get_type_mask(querybuf);
|
|
break;
|
|
|
|
case MXS_COM_STMT_PREPARE:
|
|
type = qc_get_type_mask(querybuf);
|
|
type |= QUERY_TYPE_PREPARE_STMT;
|
|
break;
|
|
|
|
case MXS_COM_STMT_EXECUTE:
|
|
/** Parsing is not needed for this type of packet */
|
|
type = QUERY_TYPE_EXEC_STMT;
|
|
break;
|
|
|
|
case MXS_COM_SHUTDOWN: /**< 8 where should shutdown be routed ? */
|
|
case MXS_COM_STATISTICS: /**< 9 ? */
|
|
case MXS_COM_PROCESS_INFO: /**< 0a ? */
|
|
case MXS_COM_CONNECT: /**< 0b ? */
|
|
case MXS_COM_PROCESS_KILL: /**< 0c ? */
|
|
case MXS_COM_TIME: /**< 0f should this be run in gateway ? */
|
|
case MXS_COM_DELAYED_INSERT:/**< 10 ? */
|
|
case MXS_COM_DAEMON: /**< 1d ? */
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
void QueryClassifier::check_create_tmp_table(GWBUF* querybuf, uint32_t type)
|
|
{
|
|
if (qc_query_is_type(type, QUERY_TYPE_CREATE_TMP_TABLE))
|
|
{
|
|
set_have_tmp_tables(true);
|
|
int size = 0;
|
|
char** tblname = qc_get_table_names(querybuf, &size, true);
|
|
std::string table;
|
|
|
|
for (int i = 0; i < size; i++)
|
|
{
|
|
if (tblname[i] && *tblname[i])
|
|
{
|
|
table = tblname[i];
|
|
|
|
if (strchr(tblname[i], '.') == NULL)
|
|
{
|
|
const char* db = qc_mysql_get_current_db(session());
|
|
table = db;
|
|
table += ".";
|
|
table += tblname[i];
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
MXS_INFO("Added temporary table %s", table.c_str());
|
|
|
|
/** Add the table to the set of temporary tables */
|
|
add_tmp_table(table);
|
|
|
|
for (int i = 0; i < size; i++)
|
|
{
|
|
MXS_FREE(tblname[i]);
|
|
}
|
|
MXS_FREE(tblname);
|
|
}
|
|
}
|
|
|
|
bool QueryClassifier::is_read_tmp_table(GWBUF* querybuf, uint32_t qtype)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (qc_query_is_type(qtype, QUERY_TYPE_READ)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_LOCAL_READ)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_USERVAR_READ)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_SYSVAR_READ)
|
|
|| qc_query_is_type(qtype, QUERY_TYPE_GSYSVAR_READ))
|
|
{
|
|
if (!foreach_table(*this, m_pSession, querybuf, &QueryClassifier::find_table))
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
void QueryClassifier::check_drop_tmp_table(GWBUF* querybuf)
|
|
{
|
|
if (qc_is_drop_table_query(querybuf))
|
|
{
|
|
foreach_table(*this, m_pSession, querybuf, &QueryClassifier::delete_table);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Detect multi-statement queries
|
|
*
|
|
* It is possible that the session state is modified inside a multi-statement
|
|
* query which would leave any slave sessions in an inconsistent state. Due to
|
|
* this, for the duration of this session, all queries will be sent to the
|
|
* master
|
|
* if the current query contains a multi-statement query.
|
|
* @param rses Router client session
|
|
* @param buf Buffer containing the full query
|
|
* @return True if the query contains multiple statements
|
|
*/
|
|
bool QueryClassifier::check_for_multi_stmt(GWBUF* buf, uint8_t packet_type)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (multi_statements_allowed() && packet_type == MXS_COM_QUERY)
|
|
{
|
|
char* ptr, * data = (char*)GWBUF_DATA(buf) + 5;
|
|
/** Payload size without command byte */
|
|
int buflen = gw_mysql_get_byte3((uint8_t*)GWBUF_DATA(buf)) - 1;
|
|
|
|
if (have_semicolon(data, buflen) && (ptr = strnchr_esc_mysql(data, ';', buflen)))
|
|
{
|
|
/** Skip stored procedures etc. */
|
|
while (ptr && is_mysql_sp_end(ptr, buflen - (ptr - data)))
|
|
{
|
|
ptr = strnchr_esc_mysql(ptr + 1, ';', buflen - (ptr - data) - 1);
|
|
}
|
|
|
|
if (ptr)
|
|
{
|
|
if (ptr < data + buflen
|
|
&& !is_mysql_statement_end(ptr, buflen - (ptr - data)))
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Handle multi statement queries and load statements
|
|
*
|
|
* One of the possible types of handling required when a request is routed
|
|
*
|
|
* @param qc The query classifier
|
|
* @param current_target The current target
|
|
* @param querybuf Buffer containing query to be routed
|
|
* @param packet_type Type of packet (database specific)
|
|
* @param qtype Query type
|
|
*
|
|
* @return QueryClassifier::CURRENT_TARGET_MASTER if the session should be fixed
|
|
* to the master, QueryClassifier::CURRENT_TARGET_UNDEFINED otherwise.
|
|
*/
|
|
QueryClassifier::current_target_t QueryClassifier::handle_multi_temp_and_load(
|
|
QueryClassifier::current_target_t current_target,
|
|
GWBUF* querybuf,
|
|
uint8_t packet_type,
|
|
uint32_t* qtype)
|
|
{
|
|
QueryClassifier::current_target_t rv = QueryClassifier::CURRENT_TARGET_UNDEFINED;
|
|
|
|
/** Check for multi-statement queries. If no master server is available
|
|
* and a multi-statement is issued, an error is returned to the client
|
|
* when the query is routed. */
|
|
if ((current_target != QueryClassifier::CURRENT_TARGET_MASTER)
|
|
&& (check_for_multi_stmt(querybuf, packet_type)
|
|
|| check_for_sp_call(querybuf, packet_type)))
|
|
{
|
|
MXS_INFO("Multi-statement query or stored procedure call, routing "
|
|
"all future queries to master.");
|
|
rv = QueryClassifier::CURRENT_TARGET_MASTER;
|
|
}
|
|
|
|
/**
|
|
* Check if the query has anything to do with temporary tables.
|
|
*/
|
|
if (have_tmp_tables() && is_packet_a_query(packet_type))
|
|
{
|
|
check_drop_tmp_table(querybuf);
|
|
if (is_read_tmp_table(querybuf, *qtype))
|
|
{
|
|
*qtype |= QUERY_TYPE_MASTER_READ;
|
|
}
|
|
}
|
|
|
|
check_create_tmp_table(querybuf, *qtype);
|
|
|
|
/**
|
|
* Check if this is a LOAD DATA LOCAL INFILE query. If so, send all queries
|
|
* to the master until the last, empty packet arrives.
|
|
*/
|
|
if (load_data_state() == QueryClassifier::LOAD_DATA_ACTIVE)
|
|
{
|
|
append_load_data_sent(querybuf);
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
bool QueryClassifier::query_continues_ps(uint8_t cmd, uint32_t stmt_id, GWBUF* buffer)
|
|
{
|
|
bool rval = false;
|
|
uint8_t prev_cmd = m_route_info.command();
|
|
|
|
if (prev_cmd == MXS_COM_STMT_SEND_LONG_DATA
|
|
&& (cmd == MXS_COM_STMT_EXECUTE || cmd == MXS_COM_STMT_SEND_LONG_DATA))
|
|
{
|
|
// PS execution must be sent to the same server where the data was sent
|
|
rval = true;
|
|
}
|
|
else if (cmd == COM_STMT_FETCH)
|
|
{
|
|
// COM_STMT_FETCH should always go to the same target as the COM_STMT_EXECUTE
|
|
rval = true;
|
|
}
|
|
else if (cmd == MXS_COM_STMT_EXECUTE)
|
|
{
|
|
if (auto params = m_sPs_manager->param_count(stmt_id))
|
|
{
|
|
size_t types_offset = MYSQL_HEADER_LEN + 1 + 4 + 1 + 4 + ((params + 7) / 8);
|
|
uint8_t have_types = 0;
|
|
|
|
if (gwbuf_copy_data(buffer, types_offset, 1, &have_types))
|
|
{
|
|
if (have_types == 0)
|
|
{
|
|
// A previous COM_STMT_EXECUTE provided the field types, and this one relies on the
|
|
// previous one. This means that this query must be routed to the same server where the
|
|
// previous COM_STMT_EXECUTE was routed.
|
|
rval = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
QueryClassifier::RouteInfo QueryClassifier::update_route_info(
|
|
QueryClassifier::current_target_t current_target,
|
|
GWBUF* pBuffer)
|
|
{
|
|
uint32_t route_target = TARGET_MASTER;
|
|
uint8_t command = 0xFF;
|
|
uint32_t type_mask = QUERY_TYPE_UNKNOWN;
|
|
uint32_t stmt_id = 0;
|
|
|
|
// Reset for every classification
|
|
m_ps_continuation = false;
|
|
|
|
// TODO: It may be sufficient to simply check whether we are in a read-only
|
|
// TODO: transaction.
|
|
bool in_read_only_trx =
|
|
(current_target != QueryClassifier::CURRENT_TARGET_UNDEFINED)
|
|
&& session_trx_is_read_only(session());
|
|
|
|
if (gwbuf_length(pBuffer) > MYSQL_HEADER_LEN)
|
|
{
|
|
command = mxs_mysql_get_command(pBuffer);
|
|
|
|
/**
|
|
* If the session is inside a read-only transaction, we trust that the
|
|
* server acts properly even when non-read-only queries are executed.
|
|
* For this reason, we can skip the parsing of the statement completely.
|
|
*/
|
|
if (in_read_only_trx)
|
|
{
|
|
type_mask = QUERY_TYPE_READ;
|
|
}
|
|
else
|
|
{
|
|
type_mask = QueryClassifier::determine_query_type(pBuffer, command);
|
|
|
|
current_target = handle_multi_temp_and_load(current_target,
|
|
pBuffer,
|
|
command,
|
|
&type_mask);
|
|
|
|
if (current_target == QueryClassifier::CURRENT_TARGET_MASTER)
|
|
{
|
|
/* If we do not have a master node, assigning the forced node is not
|
|
* effective since we don't have a node to force queries to. In this
|
|
* situation, assigning QUERY_TYPE_WRITE for the query will trigger
|
|
* the error processing. */
|
|
if (!m_pHandler->lock_to_master())
|
|
{
|
|
type_mask |= QUERY_TYPE_WRITE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mxs_log_is_priority_enabled(LOG_INFO))
|
|
{
|
|
log_transaction_status(pBuffer, type_mask);
|
|
}
|
|
/**
|
|
* Find out where to route the query. Result may not be clear; it is
|
|
* possible to have a hint for routing to a named server which can
|
|
* be either slave or master.
|
|
* If query would otherwise be routed to slave then the hint determines
|
|
* actual target server if it exists.
|
|
*
|
|
* route_target is a bitfield and may include :
|
|
* TARGET_ALL
|
|
* - route to all connected backend servers
|
|
* TARGET_SLAVE[|TARGET_NAMED_SERVER|TARGET_RLAG_MAX]
|
|
* - route primarily according to hints, then to slave and if those
|
|
* failed, eventually to master
|
|
* TARGET_MASTER[|TARGET_NAMED_SERVER|TARGET_RLAG_MAX]
|
|
* - route primarily according to the hints and if they failed,
|
|
* eventually to master
|
|
*/
|
|
|
|
if (m_pHandler->is_locked_to_master())
|
|
{
|
|
/** The session is locked to the master */
|
|
route_target = TARGET_MASTER;
|
|
|
|
if (qc_query_is_type(type_mask, QUERY_TYPE_PREPARE_NAMED_STMT)
|
|
|| qc_query_is_type(type_mask, QUERY_TYPE_PREPARE_STMT))
|
|
{
|
|
gwbuf_set_type(pBuffer, GWBUF_TYPE_COLLECT_RESULT);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (!in_read_only_trx
|
|
&& command == MXS_COM_QUERY
|
|
&& qc_get_operation(pBuffer) == QUERY_OP_EXECUTE)
|
|
{
|
|
std::string id = get_text_ps_id(pBuffer);
|
|
type_mask = ps_get_type(id);
|
|
}
|
|
else if (qc_mysql_is_ps_command(command))
|
|
{
|
|
stmt_id = ps_id_internal_get(pBuffer);
|
|
type_mask = ps_get_type(stmt_id);
|
|
m_ps_continuation = query_continues_ps(command, stmt_id, pBuffer);
|
|
}
|
|
|
|
route_target = get_route_target(command, type_mask);
|
|
}
|
|
|
|
process_routing_hints(pBuffer->hint, &route_target);
|
|
|
|
if (session_trx_is_ending(m_pSession)
|
|
|| qc_query_is_type(type_mask, QUERY_TYPE_BEGIN_TRX))
|
|
{
|
|
// Transaction is ending or starting
|
|
m_trx_is_read_only = true;
|
|
}
|
|
else if (session_trx_is_active(m_pSession)
|
|
&& !query_type_is_read_only(type_mask))
|
|
{
|
|
// Transaction is no longer read-only
|
|
m_trx_is_read_only = false;
|
|
}
|
|
}
|
|
else if (load_data_state() == QueryClassifier::LOAD_DATA_ACTIVE)
|
|
{
|
|
/** Empty packet signals end of LOAD DATA LOCAL INFILE, send it to master*/
|
|
set_load_data_state(QueryClassifier::LOAD_DATA_END);
|
|
append_load_data_sent(pBuffer);
|
|
MXS_INFO("> LOAD DATA LOCAL INFILE finished: %lu bytes sent.",
|
|
load_data_sent());
|
|
}
|
|
|
|
m_route_info = RouteInfo(route_target, command, type_mask, stmt_id);
|
|
|
|
return m_route_info;
|
|
}
|
|
|
|
// static
|
|
bool QueryClassifier::find_table(QueryClassifier& qc, const std::string& table)
|
|
{
|
|
if (qc.is_tmp_table(table))
|
|
{
|
|
MXS_INFO("Query targets a temporary table: %s", table.c_str());
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// static
|
|
bool QueryClassifier::delete_table(QueryClassifier& qc, const std::string& table)
|
|
{
|
|
qc.remove_tmp_table(table);
|
|
return true;
|
|
}
|
|
}
|