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76 lines
2.1 KiB
76 lines
2.1 KiB
// Copyright 2016 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 perfschema
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import (
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"fmt"
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"sync"
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"github.com/pingcap/parser"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/parser/model"
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"github.com/pingcap/parser/mysql"
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"github.com/pingcap/tidb/ddl"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/meta/autoid"
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"github.com/pingcap/tidb/util"
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)
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var once sync.Once
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// Init register the PERFORMANCE_SCHEMA virtual tables.
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// It should be init(), and the ideal usage should be:
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//
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// import _ "github.com/pingcap/tidb/perfschema"
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//
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// This function depends on plan/core.init(), which initialize the expression.EvalAstExpr function.
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// The initialize order is a problem if init() is used as the function name.
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func Init() {
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initOnce := func() {
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p := parser.New()
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tbls := make([]*model.TableInfo, 0)
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dbID := autoid.PerformanceSchemaDBID
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for _, sql := range perfSchemaTables {
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stmt, err := p.ParseOneStmt(sql, "", "")
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if err != nil {
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panic(err)
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}
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meta, err := ddl.BuildTableInfoFromAST(stmt.(*ast.CreateTableStmt))
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if err != nil {
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panic(err)
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}
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tbls = append(tbls, meta)
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var ok bool
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meta.ID, ok = tableIDMap[meta.Name.O]
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if !ok {
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panic(fmt.Sprintf("get performance_schema table id failed, unknown system table `%v`", meta.Name.O))
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}
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for i, c := range meta.Columns {
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c.ID = int64(i) + 1
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}
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}
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dbInfo := &model.DBInfo{
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ID: dbID,
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Name: util.PerformanceSchemaName,
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Charset: mysql.DefaultCharset,
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Collate: mysql.DefaultCollationName,
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Tables: tbls,
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}
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infoschema.RegisterVirtualTable(dbInfo, tableFromMeta)
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}
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if expression.EvalAstExpr != nil {
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once.Do(initOnce)
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}
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}
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