forked from pingcap/tidb
/
bootstrap.go
222 lines (210 loc) · 8.1 KB
/
bootstrap.go
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// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package tidb
import (
"fmt"
"runtime/debug"
"strings"
"github.com/juju/errors"
"github.com/ngaut/log"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/terror"
)
const (
// CreateUserTable is the SQL statement creates User table in system db.
CreateUserTable = `CREATE TABLE if not exists mysql.user (
Host CHAR(64),
User CHAR(16),
Password CHAR(41),
Select_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Insert_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Update_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Delete_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Create_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Drop_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Grant_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Alter_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Show_db_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Execute_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Index_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
Create_user_priv ENUM('N','Y') NOT NULL DEFAULT 'N',
PRIMARY KEY (Host, User));`
// CreateDBPrivTable is the SQL statement creates DB scope privilege table in system db.
CreateDBPrivTable = `CREATE TABLE if not exists mysql.db (
Host CHAR(60),
DB CHAR(64),
User CHAR(16),
Select_priv ENUM('N','Y') Not Null DEFAULT 'N',
Insert_priv ENUM('N','Y') Not Null DEFAULT 'N',
Update_priv ENUM('N','Y') Not Null DEFAULT 'N',
Delete_priv ENUM('N','Y') Not Null DEFAULT 'N',
Create_priv ENUM('N','Y') Not Null DEFAULT 'N',
Drop_priv ENUM('N','Y') Not Null DEFAULT 'N',
Grant_priv ENUM('N','Y') Not Null DEFAULT 'N',
Index_priv ENUM('N','Y') Not Null DEFAULT 'N',
Alter_priv ENUM('N','Y') Not Null DEFAULT 'N',
Execute_priv ENUM('N','Y') Not Null DEFAULT 'N',
PRIMARY KEY (Host, DB, User));`
// CreateTablePrivTable is the SQL statement creates table scope privilege table in system db.
CreateTablePrivTable = `CREATE TABLE if not exists mysql.tables_priv (
Host CHAR(60),
DB CHAR(64),
User CHAR(16),
Table_name CHAR(64),
Grantor CHAR(77),
Timestamp Timestamp DEFAULT CURRENT_TIMESTAMP,
Table_priv SET('Select','Insert','Update','Delete','Create','Drop','Grant', 'Index','Alter'),
Column_priv SET('Select','Insert','Update'),
PRIMARY KEY (Host, DB, User, Table_name));`
// CreateColumnPrivTable is the SQL statement creates column scope privilege table in system db.
CreateColumnPrivTable = `CREATE TABLE if not exists mysql.columns_priv(
Host CHAR(60),
DB CHAR(64),
User CHAR(16),
Table_name CHAR(64),
Column_name CHAR(64),
Timestamp Timestamp DEFAULT CURRENT_TIMESTAMP,
Column_priv SET('Select','Insert','Update'),
PRIMARY KEY (Host, DB, User, Table_name, Column_name));`
// CreateGloablVariablesTable is the SQL statement creates global variable table in system db.
// TODO: MySQL puts GLOBAL_VARIABLES table in INFORMATION_SCHEMA db.
// INFORMATION_SCHEMA is a virtual db in TiDB. So we put this table in system db.
// Maybe we will put it back to INFORMATION_SCHEMA.
CreateGloablVariablesTable = `CREATE TABLE if not exists mysql.GLOBAL_VARIABLES(
VARIABLE_NAME VARCHAR(64) Not Null PRIMARY KEY,
VARIABLE_VALUE VARCHAR(1024) DEFAULT Null);`
// CreateGloablStatusTable is the SQL statement creates global status variable table in system db.
// TODO: MySQL puts GLOBAL_STATUS table in INFORMATION_SCHEMA db.
CreateGloablStatusTable = `CREATE TABLE if not exists mysql.GLOBAL_STATUS(
VARIABLE_NAME VARCHAR(64) Not Null PRIMARY KEY,
VARIABLE_VALUE VARCHAR(1024) DEFAULT Null);`
// CreateTiDBTable is the SQL statement creates a table in system db.
// This table is a key-value struct contains some information used by TiDB.
// Currently we only put bootstrapped in it which indicates if the system is already bootstrapped.
CreateTiDBTable = `CREATE TABLE if not exists mysql.tidb(
VARIABLE_NAME VARCHAR(64) Not Null PRIMARY KEY,
VARIABLE_VALUE VARCHAR(1024) DEFAULT Null,
COMMENT VARCHAR(1024));`
)
// Bootstrap initiates system DB for a store.
func bootstrap(s Session) {
b, err := checkBootstrapped(s)
if err != nil {
log.Fatal(err)
}
if b {
return
}
doDDLWorks(s)
doDMLWorks(s)
}
const (
bootstrappedVar = "bootstrapped"
bootstrappedVarTrue = "True"
)
func checkBootstrapped(s Session) (bool, error) {
// Check if system db exists.
_, err := s.Execute(fmt.Sprintf("USE %s;", mysql.SystemDB))
if err != nil && terror.DatabaseNotExists.NotEqual(err) {
log.Fatal(err)
}
// Check bootstrapped variable value in TiDB table.
v, err := checkBootstrappedVar(s)
if err != nil {
return false, errors.Trace(err)
}
return v, nil
}
func checkBootstrappedVar(s Session) (bool, error) {
sql := fmt.Sprintf(`SELECT VARIABLE_VALUE FROM %s.%s WHERE VARIABLE_NAME="%s"`,
mysql.SystemDB, mysql.TiDBTable, bootstrappedVar)
rs, err := s.Execute(sql)
if err != nil {
if terror.TableNotExists.Equal(err) {
return false, nil
}
return false, errors.Trace(err)
}
if len(rs) != 1 {
return false, errors.New("Wrong number of Recordset")
}
r := rs[0]
row, err := r.Next()
if err != nil || row == nil {
return false, errors.Trace(err)
}
return row.Data[0].(string) == bootstrappedVarTrue, nil
}
// Execute DDL statements in bootstrap stage.
func doDDLWorks(s Session) {
// Create a test database.
mustExecute(s, "CREATE DATABASE IF NOT EXISTS test")
// Create system db.
mustExecute(s, fmt.Sprintf("CREATE DATABASE IF NOT EXISTS %s;", mysql.SystemDB))
// Create user table.
mustExecute(s, CreateUserTable)
// Create privilege tables.
mustExecute(s, CreateDBPrivTable)
mustExecute(s, CreateTablePrivTable)
mustExecute(s, CreateColumnPrivTable)
// Create global systemt variable table.
mustExecute(s, CreateGloablVariablesTable)
// Create global status variable table.
mustExecute(s, CreateGloablStatusTable)
// Create TiDB table.
mustExecute(s, CreateTiDBTable)
}
// Execute DML statements in bootstrap stage.
// All the statements run in a single transaction.
func doDMLWorks(s Session) {
mustExecute(s, "BEGIN")
// Insert a default user with empty password.
mustExecute(s, `INSERT INTO mysql.user VALUES
("localhost", "root", "", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y"),
("127.0.0.1", "root", "", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y"),
("::1", "root", "", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y", "Y");`)
// Init global system variable table.
values := make([]string, 0, len(variable.SysVars))
for k, v := range variable.SysVars {
value := fmt.Sprintf(`("%s", "%s")`, strings.ToLower(k), v.Value)
values = append(values, value)
}
sql := fmt.Sprintf("INSERT INTO %s.%s VALUES %s;", mysql.SystemDB, mysql.GlobalVariablesTable,
strings.Join(values, ", "))
mustExecute(s, sql)
// Init global status variable table.
values = make([]string, 0, len(variable.StatusVars))
for k, v := range variable.StatusVars {
value := fmt.Sprintf(`("%s", "%s")`, strings.ToLower(k), v.Value)
values = append(values, value)
}
sql = fmt.Sprintf("INSERT INTO %s.%s VALUES %s;", mysql.SystemDB, mysql.GlobalStatusTable,
strings.Join(values, ", "))
mustExecute(s, sql)
sql = fmt.Sprintf(`INSERT INTO %s.%s VALUES("%s", "%s", "Bootstrap flag. Do not delete.")
ON DUPLICATE KEY UPDATE VARIABLE_VALUE="%s"`,
mysql.SystemDB, mysql.TiDBTable, bootstrappedVar, bootstrappedVarTrue, bootstrappedVarTrue)
mustExecute(s, sql)
mustExecute(s, "COMMIT")
}
func mustExecute(s Session, sql string) {
_, err := s.Execute(sql)
if err != nil {
debug.PrintStack()
log.Fatal(err)
}
}