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163 lines
4.1 KiB
163 lines
4.1 KiB
// Copyright 2020 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stmtsummary
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import (
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"fmt"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/config"
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)
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const (
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typeEnable = iota
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typeEnableInternalQuery
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typeRefreshInterval
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typeHistorySize
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typeMaxStmtCount
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typeMaxSQLLength
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typesNum
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)
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type systemVars struct {
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sync.Mutex
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// This array itself won't be modified once created. Only its elements may be modified.
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variables []variable
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}
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type variable struct {
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sessionValue string
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globalValue string
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finalValue int64
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}
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func newSysVars() *systemVars {
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s := &systemVars{
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variables: make([]variable, typesNum),
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}
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// Initialize these configurations by values in the config file.
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// They may be overwritten by system variables later.
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for varType := range s.variables {
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atomic.StoreInt64(&s.variables[varType].finalValue, getConfigValue(varType))
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}
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return s
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}
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func (s *systemVars) getVariable(varType int) int64 {
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return atomic.LoadInt64(&s.variables[varType].finalValue)
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}
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func (s *systemVars) setVariable(varType int, valueStr string, isSession bool) error {
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s.Lock()
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defer s.Unlock()
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v := &s.variables[varType]
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if isSession {
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v.sessionValue = valueStr
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} else {
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v.globalValue = valueStr
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}
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sessionValue := v.sessionValue
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globalValue := v.globalValue
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var valueInt int64
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switch varType {
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case typeEnable, typeEnableInternalQuery:
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valueInt = getBoolFinalVariable(varType, sessionValue, globalValue)
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case typeHistorySize, typeMaxSQLLength:
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valueInt = getIntFinalVariable(varType, sessionValue, globalValue, 0)
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case typeRefreshInterval, typeMaxStmtCount:
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valueInt = getIntFinalVariable(varType, sessionValue, globalValue, 1)
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default:
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return errors.New(fmt.Sprintf("no such type of variable: %d", varType))
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}
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atomic.StoreInt64(&v.finalValue, valueInt)
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return nil
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}
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func getBoolFinalVariable(varType int, sessionValue, globalValue string) int64 {
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var valueInt int64
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if len(sessionValue) > 0 {
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valueInt = normalizeEnableValue(sessionValue)
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} else if len(globalValue) > 0 {
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valueInt = normalizeEnableValue(globalValue)
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} else {
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valueInt = getConfigValue(varType)
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}
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return valueInt
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}
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// normalizeEnableValue converts 'ON' or '1' to 1 and 'OFF' or '0' to 0.
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func normalizeEnableValue(value string) int64 {
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switch {
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case strings.EqualFold(value, "ON"):
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return 1
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case value == "1":
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return 1
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default:
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return 0
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}
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}
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func getIntFinalVariable(varType int, sessionValue, globalValue string, minValue int64) int64 {
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valueInt := minValue - 1
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var err error
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if len(sessionValue) > 0 {
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valueInt, err = strconv.ParseInt(sessionValue, 10, 64)
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if err != nil {
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valueInt = minValue - 1
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}
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}
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if valueInt < minValue {
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valueInt, err = strconv.ParseInt(globalValue, 10, 64)
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if err != nil {
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valueInt = minValue - 1
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}
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}
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// If session and global variables are both '', use the value in config.
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if valueInt < minValue {
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valueInt = getConfigValue(varType)
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}
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return valueInt
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}
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func getConfigValue(varType int) int64 {
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var valueInt int64
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stmtSummaryConfig := config.GetGlobalConfig().StmtSummary
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switch varType {
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case typeEnable:
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if stmtSummaryConfig.Enable {
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valueInt = 1
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}
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case typeEnableInternalQuery:
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if stmtSummaryConfig.EnableInternalQuery {
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valueInt = 1
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}
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case typeRefreshInterval:
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valueInt = int64(stmtSummaryConfig.RefreshInterval)
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case typeHistorySize:
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valueInt = int64(stmtSummaryConfig.HistorySize)
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case typeMaxStmtCount:
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valueInt = int64(stmtSummaryConfig.MaxStmtCount)
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case typeMaxSQLLength:
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valueInt = int64(stmtSummaryConfig.MaxSQLLength)
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default:
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panic(fmt.Sprintf("No such type of variable: %d", varType))
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}
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return valueInt
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}
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