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misc.go
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// 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 ast
import (
"bytes"
"fmt"
"strings"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/util/auth"
)
var (
_ StmtNode = &AdminStmt{}
_ StmtNode = &AlterUserStmt{}
_ StmtNode = &BeginStmt{}
_ StmtNode = &BinlogStmt{}
_ StmtNode = &CommitStmt{}
_ StmtNode = &CreateUserStmt{}
_ StmtNode = &DeallocateStmt{}
_ StmtNode = &DoStmt{}
_ StmtNode = &ExecuteStmt{}
_ StmtNode = &ExplainStmt{}
_ StmtNode = &GrantStmt{}
_ StmtNode = &PrepareStmt{}
_ StmtNode = &RollbackStmt{}
_ StmtNode = &SetPwdStmt{}
_ StmtNode = &SetStmt{}
_ StmtNode = &UseStmt{}
_ StmtNode = &FlushStmt{}
_ StmtNode = &KillStmt{}
_ Node = &PrivElem{}
_ Node = &VariableAssignment{}
)
// Isolation level constants.
const (
ReadCommitted = "READ-COMMITTED"
ReadUncommitted = "READ-UNCOMMITTED"
Serializable = "SERIALIZABLE"
RepeatableRead = "REPEATABLE-READ"
// Valid formats for explain statement.
ExplainFormatROW = "row"
ExplainFormatDOT = "dot"
)
var (
// ExplainFormats stores the valid formats for explain statement, used by validator.
ExplainFormats = []string{
ExplainFormatROW,
ExplainFormatDOT,
}
)
// TypeOpt is used for parsing data type option from SQL.
type TypeOpt struct {
IsUnsigned bool
IsZerofill bool
}
// FloatOpt is used for parsing floating-point type option from SQL.
// See http://dev.mysql.com/doc/refman/5.7/en/floating-point-types.html
type FloatOpt struct {
Flen int
Decimal int
}
// AuthOption is used for parsing create use statement.
type AuthOption struct {
// ByAuthString set as true, if AuthString is used for authorization. Otherwise, authorization is done by HashString.
ByAuthString bool
AuthString string
HashString string
// TODO: support auth_plugin
}
// TraceStmt is a statement to trace what sql actually does at background.
type TraceStmt struct {
stmtNode
Stmt StmtNode
Format string
}
// Accept implements Node Accept interface.
func (n *TraceStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*TraceStmt)
node, ok := n.Stmt.Accept(v)
if !ok {
return n, false
}
n.Stmt = node.(DMLNode)
return v.Leave(n)
}
// ExplainStmt is a statement to provide information about how is SQL statement executed
// or get columns information in a table.
// See https://dev.mysql.com/doc/refman/5.7/en/explain.html
type ExplainStmt struct {
stmtNode
Stmt StmtNode
Format string
}
// Accept implements Node Accept interface.
func (n *ExplainStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*ExplainStmt)
node, ok := n.Stmt.Accept(v)
if !ok {
return n, false
}
n.Stmt = node.(DMLNode)
return v.Leave(n)
}
// PrepareStmt is a statement to prepares a SQL statement which contains placeholders,
// and it is executed with ExecuteStmt and released with DeallocateStmt.
// See https://dev.mysql.com/doc/refman/5.7/en/prepare.html
type PrepareStmt struct {
stmtNode
Name string
SQLText string
SQLVar *VariableExpr
}
// Accept implements Node Accept interface.
func (n *PrepareStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*PrepareStmt)
if n.SQLVar != nil {
node, ok := n.SQLVar.Accept(v)
if !ok {
return n, false
}
n.SQLVar = node.(*VariableExpr)
}
return v.Leave(n)
}
// DeallocateStmt is a statement to release PreparedStmt.
// See https://dev.mysql.com/doc/refman/5.7/en/deallocate-prepare.html
type DeallocateStmt struct {
stmtNode
Name string
}
// Accept implements Node Accept interface.
func (n *DeallocateStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*DeallocateStmt)
return v.Leave(n)
}
// ExecuteStmt is a statement to execute PreparedStmt.
// See https://dev.mysql.com/doc/refman/5.7/en/execute.html
type ExecuteStmt struct {
stmtNode
Name string
UsingVars []ExprNode
ExecID uint32
}
// Accept implements Node Accept interface.
func (n *ExecuteStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*ExecuteStmt)
for i, val := range n.UsingVars {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.UsingVars[i] = node.(ExprNode)
}
return v.Leave(n)
}
// BeginStmt is a statement to start a new transaction.
// See https://dev.mysql.com/doc/refman/5.7/en/commit.html
type BeginStmt struct {
stmtNode
}
// Accept implements Node Accept interface.
func (n *BeginStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*BeginStmt)
return v.Leave(n)
}
// BinlogStmt is an internal-use statement.
// We just parse and ignore it.
// See http://dev.mysql.com/doc/refman/5.7/en/binlog.html
type BinlogStmt struct {
stmtNode
Str string
}
// Accept implements Node Accept interface.
func (n *BinlogStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*BinlogStmt)
return v.Leave(n)
}
// CommitStmt is a statement to commit the current transaction.
// See https://dev.mysql.com/doc/refman/5.7/en/commit.html
type CommitStmt struct {
stmtNode
}
// Accept implements Node Accept interface.
func (n *CommitStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*CommitStmt)
return v.Leave(n)
}
// RollbackStmt is a statement to roll back the current transaction.
// See https://dev.mysql.com/doc/refman/5.7/en/commit.html
type RollbackStmt struct {
stmtNode
}
// Accept implements Node Accept interface.
func (n *RollbackStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*RollbackStmt)
return v.Leave(n)
}
// UseStmt is a statement to use the DBName database as the current database.
// See https://dev.mysql.com/doc/refman/5.7/en/use.html
type UseStmt struct {
stmtNode
DBName string
}
// Accept implements Node Accept interface.
func (n *UseStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*UseStmt)
return v.Leave(n)
}
const (
// SetNames is the const for set names/charset stmt.
// If VariableAssignment.Name == Names, it should be set names/charset stmt.
SetNames = "SetNAMES"
)
// VariableAssignment is a variable assignment struct.
type VariableAssignment struct {
node
Name string
Value ExprNode
IsGlobal bool
IsSystem bool
// ExtendValue is a way to store extended info.
// VariableAssignment should be able to store information for SetCharset/SetPWD Stmt.
// For SetCharsetStmt, Value is charset, ExtendValue is collation.
// TODO: Use SetStmt to implement set password statement.
ExtendValue *ValueExpr
}
// Accept implements Node interface.
func (n *VariableAssignment) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*VariableAssignment)
node, ok := n.Value.Accept(v)
if !ok {
return n, false
}
n.Value = node.(ExprNode)
return v.Leave(n)
}
// FlushStmtType is the type for FLUSH statement.
type FlushStmtType int
// Flush statement types.
const (
FlushNone FlushStmtType = iota
FlushTables
FlushPrivileges
)
// FlushStmt is a statement to flush tables/privileges/optimizer costs and so on.
type FlushStmt struct {
stmtNode
Tp FlushStmtType // Privileges/Tables/...
NoWriteToBinLog bool
Tables []*TableName // For FlushTableStmt, if Tables is empty, it means flush all tables.
ReadLock bool
}
// Accept implements Node Accept interface.
func (n *FlushStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*FlushStmt)
return v.Leave(n)
}
// KillStmt is a statement to kill a query or connection.
type KillStmt struct {
stmtNode
// Query indicates whether terminate a single query on this connection or the whole connection.
// If Query is true, terminates the statement the connection is currently executing, but leaves the connection itself intact.
// If Query is false, terminates the connection associated with the given ConnectionID, after terminating any statement the connection is executing.
Query bool
ConnectionID uint64
// TiDBExtension is used to indicate whether the user knows he is sending kill statement to the right tidb-server.
// When the SQL grammar is "KILL TIDB [CONNECTION | QUERY] connectionID", TiDBExtension will be set.
// It's a special grammar extension in TiDB. This extension exists because, when the connection is:
// client -> LVS proxy -> TiDB, and type Ctrl+C in client, the following action will be executed:
// new a connection; kill xxx;
// kill command may send to the wrong TiDB, because the exists of LVS proxy, and kill the wrong session.
// So, "KILL TIDB" grammar is introduced, and it REQUIRES DIRECT client -> TiDB TOPOLOGY.
// TODO: The standard KILL grammar will be supported once we have global connectionID.
TiDBExtension bool
}
// Accept implements Node Accept interface.
func (n *KillStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*KillStmt)
return v.Leave(n)
}
// SetStmt is the statement to set variables.
type SetStmt struct {
stmtNode
// Variables is the list of variable assignment.
Variables []*VariableAssignment
}
// Accept implements Node Accept interface.
func (n *SetStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*SetStmt)
for i, val := range n.Variables {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.Variables[i] = node.(*VariableAssignment)
}
return v.Leave(n)
}
/*
// SetCharsetStmt is a statement to assign values to character and collation variables.
// See https://dev.mysql.com/doc/refman/5.7/en/set-statement.html
type SetCharsetStmt struct {
stmtNode
Charset string
Collate string
}
// Accept implements Node Accept interface.
func (n *SetCharsetStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*SetCharsetStmt)
return v.Leave(n)
}
*/
// SetPwdStmt is a statement to assign a password to user account.
// See https://dev.mysql.com/doc/refman/5.7/en/set-password.html
type SetPwdStmt struct {
stmtNode
User *auth.UserIdentity
Password string
}
// SecureText implements SensitiveStatement interface.
func (n *SetPwdStmt) SecureText() string {
return fmt.Sprintf("set password for user %s", n.User)
}
// Accept implements Node Accept interface.
func (n *SetPwdStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*SetPwdStmt)
return v.Leave(n)
}
// UserSpec is used for parsing create user statement.
type UserSpec struct {
User *auth.UserIdentity
AuthOpt *AuthOption
}
// SecurityString formats the UserSpec without password information.
func (u *UserSpec) SecurityString() string {
withPassword := false
if opt := u.AuthOpt; opt != nil {
if len(opt.AuthString) > 0 || len(opt.HashString) > 0 {
withPassword = true
}
}
if withPassword {
return fmt.Sprintf("{%s password = ***}", u.User)
}
return u.User.String()
}
// EncodedPassword returns the encoded password (which is the real data mysql.user).
// The boolean value indicates input's password format is legal or not.
func (u *UserSpec) EncodedPassword() (string, bool) {
if u.AuthOpt == nil {
return "", true
}
opt := u.AuthOpt
if opt.ByAuthString {
return auth.EncodePassword(opt.AuthString), true
}
// Not a legal password string.
if len(opt.HashString) != 41 || !strings.HasPrefix(opt.HashString, "*") {
return "", false
}
return opt.HashString, true
}
// CreateUserStmt creates user account.
// See https://dev.mysql.com/doc/refman/5.7/en/create-user.html
type CreateUserStmt struct {
stmtNode
IfNotExists bool
Specs []*UserSpec
}
// Accept implements Node Accept interface.
func (n *CreateUserStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*CreateUserStmt)
return v.Leave(n)
}
// SecureText implements SensitiveStatement interface.
func (n *CreateUserStmt) SecureText() string {
var buf bytes.Buffer
buf.WriteString("create user")
for _, user := range n.Specs {
buf.WriteString(" ")
buf.WriteString(user.SecurityString())
}
return buf.String()
}
// AlterUserStmt modifies user account.
// See https://dev.mysql.com/doc/refman/5.7/en/alter-user.html
type AlterUserStmt struct {
stmtNode
IfExists bool
CurrentAuth *AuthOption
Specs []*UserSpec
}
// SecureText implements SensitiveStatement interface.
func (n *AlterUserStmt) SecureText() string {
var buf bytes.Buffer
buf.WriteString("alter user")
for _, user := range n.Specs {
buf.WriteString(" ")
buf.WriteString(user.SecurityString())
}
return buf.String()
}
// Accept implements Node Accept interface.
func (n *AlterUserStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*AlterUserStmt)
return v.Leave(n)
}
// DropUserStmt creates user account.
// See http://dev.mysql.com/doc/refman/5.7/en/drop-user.html
type DropUserStmt struct {
stmtNode
IfExists bool
UserList []*auth.UserIdentity
}
// Accept implements Node Accept interface.
func (n *DropUserStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*DropUserStmt)
return v.Leave(n)
}
// DoStmt is the struct for DO statement.
type DoStmt struct {
stmtNode
Exprs []ExprNode
}
// Accept implements Node Accept interface.
func (n *DoStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*DoStmt)
for i, val := range n.Exprs {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.Exprs[i] = node.(ExprNode)
}
return v.Leave(n)
}
// AdminStmtType is the type for admin statement.
type AdminStmtType int
// Admin statement types.
const (
AdminShowDDL = iota + 1
AdminCheckTable
AdminShowDDLJobs
AdminCancelDDLJobs
AdminCheckIndex
AdminRecoverIndex
AdminCleanupIndex
AdminCheckIndexRange
AdminShowDDLJobQueries
AdminChecksumTable
)
// HandleRange represents a range where handle value >= Begin and < End.
type HandleRange struct {
Begin int64
End int64
}
// AdminStmt is the struct for Admin statement.
type AdminStmt struct {
stmtNode
Tp AdminStmtType
Index string
Tables []*TableName
JobIDs []int64
HandleRanges []HandleRange
}
// Accept implements Node Accept interface.
func (n *AdminStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*AdminStmt)
for i, val := range n.Tables {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.Tables[i] = node.(*TableName)
}
return v.Leave(n)
}
// PrivElem is the privilege type and optional column list.
type PrivElem struct {
node
Priv mysql.PrivilegeType
Cols []*ColumnName
}
// Accept implements Node Accept interface.
func (n *PrivElem) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*PrivElem)
for i, val := range n.Cols {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.Cols[i] = node.(*ColumnName)
}
return v.Leave(n)
}
// ObjectTypeType is the type for object type.
type ObjectTypeType int
const (
// ObjectTypeNone is for empty object type.
ObjectTypeNone ObjectTypeType = iota + 1
// ObjectTypeTable means the following object is a table.
ObjectTypeTable
)
// GrantLevelType is the type for grant level.
type GrantLevelType int
const (
// GrantLevelNone is the dummy const for default value.
GrantLevelNone GrantLevelType = iota + 1
// GrantLevelGlobal means the privileges are administrative or apply to all databases on a given server.
GrantLevelGlobal
// GrantLevelDB means the privileges apply to all objects in a given database.
GrantLevelDB
// GrantLevelTable means the privileges apply to all columns in a given table.
GrantLevelTable
)
// GrantLevel is used for store the privilege scope.
type GrantLevel struct {
Level GrantLevelType
DBName string
TableName string
}
// RevokeStmt is the struct for REVOKE statement.
type RevokeStmt struct {
stmtNode
Privs []*PrivElem
ObjectType ObjectTypeType
Level *GrantLevel
Users []*UserSpec
}
// Accept implements Node Accept interface.
func (n *RevokeStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*RevokeStmt)
for i, val := range n.Privs {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.Privs[i] = node.(*PrivElem)
}
return v.Leave(n)
}
// GrantStmt is the struct for GRANT statement.
type GrantStmt struct {
stmtNode
Privs []*PrivElem
ObjectType ObjectTypeType
Level *GrantLevel
Users []*UserSpec
WithGrant bool
}
// SecureText implements SensitiveStatement interface.
func (n *GrantStmt) SecureText() string {
text := n.text
// Filter "identified by xxx" because it would expose password information.
idx := strings.Index(strings.ToLower(text), "identified")
if idx > 0 {
text = text[:idx]
}
return text
}
// Accept implements Node Accept interface.
func (n *GrantStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*GrantStmt)
for i, val := range n.Privs {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.Privs[i] = node.(*PrivElem)
}
return v.Leave(n)
}
// Ident is the table identifier composed of schema name and table name.
type Ident struct {
Schema model.CIStr
Name model.CIStr
}
// Full returns an Ident which set schema to the current schema if it is empty.
func (i Ident) Full(ctx sessionctx.Context) (full Ident) {
full.Name = i.Name
if i.Schema.O != "" {
full.Schema = i.Schema
} else {
full.Schema = model.NewCIStr(ctx.GetSessionVars().CurrentDB)
}
return
}
// String implements fmt.Stringer interface.
func (i Ident) String() string {
if i.Schema.O == "" {
return i.Name.O
}
return fmt.Sprintf("%s.%s", i.Schema, i.Name)
}
// SelectStmtOpts wrap around select hints and switches
type SelectStmtOpts struct {
Distinct bool
SQLCache bool
CalcFoundRows bool
StraightJoin bool
Priority mysql.PriorityEnum
TableHints []*TableOptimizerHint
}
// TableOptimizerHint is Table level optimizer hint
type TableOptimizerHint struct {
node
// HintName is the name or alias of the table(s) which the hint will affect.
// Table hints has no schema info
// It allows only table name or alias (if table has an alias)
HintName model.CIStr
Tables []model.CIStr
}
// Accept implements Node Accept interface.
func (n *TableOptimizerHint) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*TableOptimizerHint)
return v.Leave(n)
}