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// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
// The MIT License (MIT)
//
// Copyright (c) 2014 wandoulabs
// Copyright (c) 2014 siddontang
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 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 server
import (
"context"
"encoding/binary"
"fmt"
"math"
"runtime/trace"
"strconv"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/parser/mysql"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/sessionctx/stmtctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/execdetails"
"github.com/pingcap/tidb/util/hack"
)
func (cc *clientConn) handleStmtPrepare(ctx context.Context, sql string) error {
stmt, columns, params, err := cc.ctx.Prepare(sql)
if err != nil {
return err
}
data := make([]byte, 4, 128)
//status ok
data = append(data, 0)
//stmt id
data = dumpUint32(data, uint32(stmt.ID()))
//number columns
data = dumpUint16(data, uint16(len(columns)))
//number params
data = dumpUint16(data, uint16(len(params)))
//filter [00]
data = append(data, 0)
//warning count
data = append(data, 0, 0) //TODO support warning count
if err := cc.writePacket(data); err != nil {
return err
}
if len(params) > 0 {
for i := 0; i < len(params); i++ {
data = data[0:4]
data = params[i].Dump(data)
if err := cc.writePacket(data); err != nil {
return err
}
}
if err := cc.writeEOF(0); err != nil {
return err
}
}
if len(columns) > 0 {
for i := 0; i < len(columns); i++ {
data = data[0:4]
data = columns[i].Dump(data)
if err := cc.writePacket(data); err != nil {
return err
}
}
if err := cc.writeEOF(0); err != nil {
return err
}
}
return cc.flush(ctx)
}
func (cc *clientConn) handleStmtExecute(ctx context.Context, data []byte) (err error) {
defer trace.StartRegion(ctx, "HandleStmtExecute").End()
if len(data) < 9 {
return mysql.ErrMalformPacket
}
pos := 0
stmtID := binary.LittleEndian.Uint32(data[0:4])
pos += 4
stmt := cc.ctx.GetStatement(int(stmtID))
if stmt == nil {
return mysql.NewErr(mysql.ErrUnknownStmtHandler,
strconv.FormatUint(uint64(stmtID), 10), "stmt_execute")
}
flag := data[pos]
pos++
// Please refer to https://dev.mysql.com/doc/internals/en/com-stmt-execute.html
// The client indicates that it wants to use cursor by setting this flag.
// 0x00 CURSOR_TYPE_NO_CURSOR
// 0x01 CURSOR_TYPE_READ_ONLY
// 0x02 CURSOR_TYPE_FOR_UPDATE
// 0x04 CURSOR_TYPE_SCROLLABLE
// Now we only support forward-only, read-only cursor.
var useCursor bool
switch flag {
case 0:
useCursor = false
case 1:
useCursor = true
default:
return mysql.NewErrf(mysql.ErrUnknown, "unsupported flag %d", nil, flag)
}
// skip iteration-count, always 1
pos += 4
var (
nullBitmaps []byte
paramTypes []byte
paramValues []byte
)
numParams := stmt.NumParams()
args := make([]types.Datum, numParams)
if numParams > 0 {
nullBitmapLen := (numParams + 7) >> 3
if len(data) < (pos + nullBitmapLen + 1) {
return mysql.ErrMalformPacket
}
nullBitmaps = data[pos : pos+nullBitmapLen]
pos += nullBitmapLen
// new param bound flag
if data[pos] == 1 {
pos++
if len(data) < (pos + (numParams << 1)) {
return mysql.ErrMalformPacket
}
paramTypes = data[pos : pos+(numParams<<1)]
pos += numParams << 1
paramValues = data[pos:]
// Just the first StmtExecute packet contain parameters type,
// we need save it for further use.
stmt.SetParamsType(paramTypes)
} else {
paramValues = data[pos+1:]
}
err = parseExecArgs(cc.ctx.GetSessionVars().StmtCtx, args, stmt.BoundParams(), nullBitmaps, stmt.GetParamsType(), paramValues)
stmt.Reset()
if err != nil {
return errors.Annotate(err, cc.preparedStmt2String(stmtID))
}
}
ctx = context.WithValue(ctx, execdetails.StmtExecDetailKey, &execdetails.StmtExecDetails{})
rs, err := stmt.Execute(ctx, args)
if err != nil {
return errors.Annotate(err, cc.preparedStmt2String(stmtID))
}
if rs == nil {
return cc.writeOK(ctx)
}
// if the client wants to use cursor
// we should hold the ResultSet in PreparedStatement for next stmt_fetch, and only send back ColumnInfo.
// Tell the client cursor exists in server by setting proper serverStatus.
if useCursor {
stmt.StoreResultSet(rs)
err = cc.writeColumnInfo(rs.Columns(), mysql.ServerStatusCursorExists)
if err != nil {
return err
}
if cl, ok := rs.(fetchNotifier); ok {
cl.OnFetchReturned()
}
// explicitly flush columnInfo to client.
return cc.flush(ctx)
}
err = cc.writeResultset(ctx, rs, true, 0, 0)
if err != nil {
return errors.Annotate(err, cc.preparedStmt2String(stmtID))
}
return nil
}
// maxFetchSize constants
const (
maxFetchSize = 1024
)
func (cc *clientConn) handleStmtFetch(ctx context.Context, data []byte) (err error) {
cc.ctx.GetSessionVars().StartTime = time.Now()
stmtID, fetchSize, err := parseStmtFetchCmd(data)
if err != nil {
return err
}
stmt := cc.ctx.GetStatement(int(stmtID))
if stmt == nil {
return errors.Annotate(mysql.NewErr(mysql.ErrUnknownStmtHandler,
strconv.FormatUint(uint64(stmtID), 10), "stmt_fetch"), cc.preparedStmt2String(stmtID))
}
sql := ""
if prepared, ok := cc.ctx.GetStatement(int(stmtID)).(*TiDBStatement); ok {
sql = prepared.sql
}
cc.ctx.SetProcessInfo(sql, time.Now(), mysql.ComStmtExecute, 0)
rs := stmt.GetResultSet()
if rs == nil {
return errors.Annotate(mysql.NewErr(mysql.ErrUnknownStmtHandler,
strconv.FormatUint(uint64(stmtID), 10), "stmt_fetch_rs"), cc.preparedStmt2String(stmtID))
}
err = cc.writeResultset(ctx, rs, true, mysql.ServerStatusCursorExists, int(fetchSize))
if err != nil {
return errors.Annotate(err, cc.preparedStmt2String(stmtID))
}
return nil
}
func parseStmtFetchCmd(data []byte) (uint32, uint32, error) {
if len(data) != 8 {
return 0, 0, mysql.ErrMalformPacket
}
// Please refer to https://dev.mysql.com/doc/internals/en/com-stmt-fetch.html
stmtID := binary.LittleEndian.Uint32(data[0:4])
fetchSize := binary.LittleEndian.Uint32(data[4:8])
if fetchSize > maxFetchSize {
fetchSize = maxFetchSize
}
return stmtID, fetchSize, nil
}
func parseExecArgs(sc *stmtctx.StatementContext, args []types.Datum, boundParams [][]byte, nullBitmap, paramTypes, paramValues []byte) (err error) {
pos := 0
var (
tmp interface{}
v []byte
n int
isNull bool
)
for i := 0; i < len(args); i++ {
// if params had received via ComStmtSendLongData, use them directly.
// ref https://dev.mysql.com/doc/internals/en/com-stmt-send-long-data.html
// see clientConn#handleStmtSendLongData
if boundParams[i] != nil {
args[i] = types.NewBytesDatum(boundParams[i])
continue
}
// check nullBitMap to determine the NULL arguments.
// ref https://dev.mysql.com/doc/internals/en/com-stmt-execute.html
// notice: some client(e.g. mariadb) will set nullBitMap even if data had be sent via ComStmtSendLongData,
// so this check need place after boundParam's check.
if nullBitmap[i>>3]&(1<<(uint(i)%8)) > 0 {
var nilDatum types.Datum
nilDatum.SetNull()
args[i] = nilDatum
continue
}
if (i<<1)+1 >= len(paramTypes) {
return mysql.ErrMalformPacket
}
tp := paramTypes[i<<1]
isUnsigned := (paramTypes[(i<<1)+1] & 0x80) > 0
switch tp {
case mysql.TypeNull:
var nilDatum types.Datum
nilDatum.SetNull()
args[i] = nilDatum
continue
case mysql.TypeTiny:
if len(paramValues) < (pos + 1) {
err = mysql.ErrMalformPacket
return
}
if isUnsigned {
args[i] = types.NewUintDatum(uint64(uint8(paramValues[pos])))
} else {
args[i] = types.NewIntDatum(int64(int8(paramValues[pos])))
}
pos++
continue
case mysql.TypeShort, mysql.TypeYear:
if len(paramValues) < (pos + 2) {
err = mysql.ErrMalformPacket
return
}
valU16 := binary.LittleEndian.Uint16(paramValues[pos : pos+2])
if isUnsigned {
args[i] = types.NewUintDatum(uint64(uint16(valU16)))
} else {
args[i] = types.NewIntDatum(int64(int16(valU16)))
}
pos += 2
continue
case mysql.TypeInt24, mysql.TypeLong:
if len(paramValues) < (pos + 4) {
err = mysql.ErrMalformPacket
return
}
valU32 := binary.LittleEndian.Uint32(paramValues[pos : pos+4])
if isUnsigned {
args[i] = types.NewUintDatum(uint64(uint32(valU32)))
} else {
args[i] = types.NewIntDatum(int64(int32(valU32)))
}
pos += 4
continue
case mysql.TypeLonglong:
if len(paramValues) < (pos + 8) {
err = mysql.ErrMalformPacket
return
}
valU64 := binary.LittleEndian.Uint64(paramValues[pos : pos+8])
if isUnsigned {
args[i] = types.NewUintDatum(valU64)
} else {
args[i] = types.NewIntDatum(int64(valU64))
}
pos += 8
continue
case mysql.TypeFloat:
if len(paramValues) < (pos + 4) {
err = mysql.ErrMalformPacket
return
}
args[i] = types.NewFloat32Datum(math.Float32frombits(binary.LittleEndian.Uint32(paramValues[pos : pos+4])))
pos += 4
continue
case mysql.TypeDouble:
if len(paramValues) < (pos + 8) {
err = mysql.ErrMalformPacket
return
}
args[i] = types.NewFloat64Datum(math.Float64frombits(binary.LittleEndian.Uint64(paramValues[pos : pos+8])))
pos += 8
continue
case mysql.TypeDate, mysql.TypeTimestamp, mysql.TypeDatetime:
if len(paramValues) < (pos + 1) {
err = mysql.ErrMalformPacket
return
}
// See https://dev.mysql.com/doc/internals/en/binary-protocol-value.html
// for more details.
length := uint8(paramValues[pos])
pos++
switch length {
case 0:
tmp = types.ZeroDatetimeStr
case 4:
pos, tmp = parseBinaryDate(pos, paramValues)
case 7:
pos, tmp = parseBinaryDateTime(pos, paramValues)
case 11:
pos, tmp = parseBinaryTimestamp(pos, paramValues)
default:
err = mysql.ErrMalformPacket
return
}
args[i] = types.NewDatum(tmp) // FIXME: After check works!!!!!!
continue
case mysql.TypeDuration:
if len(paramValues) < (pos + 1) {
err = mysql.ErrMalformPacket
return
}
// See https://dev.mysql.com/doc/internals/en/binary-protocol-value.html
// for more details.
length := uint8(paramValues[pos])
pos++
switch length {
case 0:
tmp = "0"
case 8:
isNegative := uint8(paramValues[pos])
if isNegative > 1 {
err = mysql.ErrMalformPacket
return
}
pos++
pos, tmp = parseBinaryDuration(pos, paramValues, isNegative)
case 12:
isNegative := uint8(paramValues[pos])
if isNegative > 1 {
err = mysql.ErrMalformPacket
return
}
pos++
pos, tmp = parseBinaryDurationWithMS(pos, paramValues, isNegative)
default:
err = mysql.ErrMalformPacket
return
}
args[i] = types.NewDatum(tmp)
continue
case mysql.TypeNewDecimal:
if len(paramValues) < (pos + 1) {
err = mysql.ErrMalformPacket
return
}
v, isNull, n, err = parseLengthEncodedBytes(paramValues[pos:])
pos += n
if err != nil {
return
}
if isNull {
args[i] = types.NewDecimalDatum(nil)
} else {
var dec types.MyDecimal
err = sc.HandleTruncate(dec.FromString(v))
if err != nil {
return err
}
args[i] = types.NewDecimalDatum(&dec)
}
continue
case mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob:
if len(paramValues) < (pos + 1) {
err = mysql.ErrMalformPacket
return
}
v, isNull, n, err = parseLengthEncodedBytes(paramValues[pos:])
pos += n
if err != nil {
return
}
if isNull {
args[i] = types.NewBytesDatum(nil)
} else {
args[i] = types.NewBytesDatum(v)
}
continue
case mysql.TypeUnspecified, mysql.TypeVarchar, mysql.TypeVarString, mysql.TypeString,
mysql.TypeEnum, mysql.TypeSet, mysql.TypeGeometry, mysql.TypeBit:
if len(paramValues) < (pos + 1) {
err = mysql.ErrMalformPacket
return
}
v, isNull, n, err = parseLengthEncodedBytes(paramValues[pos:])
pos += n
if err != nil {
return
}
if !isNull {
tmp = string(hack.String(v))
} else {
tmp = nil
}
args[i] = types.NewDatum(tmp)
continue
default:
err = errUnknownFieldType.GenWithStack("stmt unknown field type %d", tp)
return
}
}
return
}
func parseBinaryDate(pos int, paramValues []byte) (int, string) {
year := binary.LittleEndian.Uint16(paramValues[pos : pos+2])
pos += 2
month := uint8(paramValues[pos])
pos++
day := uint8(paramValues[pos])
pos++
return pos, fmt.Sprintf("%04d-%02d-%02d", year, month, day)
}
func parseBinaryDateTime(pos int, paramValues []byte) (int, string) {
pos, date := parseBinaryDate(pos, paramValues)
hour := uint8(paramValues[pos])
pos++
minute := uint8(paramValues[pos])
pos++
second := uint8(paramValues[pos])
pos++
return pos, fmt.Sprintf("%s %02d:%02d:%02d", date, hour, minute, second)
}
func parseBinaryTimestamp(pos int, paramValues []byte) (int, string) {
pos, dateTime := parseBinaryDateTime(pos, paramValues)
microSecond := binary.LittleEndian.Uint32(paramValues[pos : pos+4])
pos += 4
return pos, fmt.Sprintf("%s.%06d", dateTime, microSecond)
}
func parseBinaryDuration(pos int, paramValues []byte, isNegative uint8) (int, string) {
sign := ""
if isNegative == 1 {
sign = "-"
}
days := binary.LittleEndian.Uint32(paramValues[pos : pos+4])
pos += 4
hours := uint8(paramValues[pos])
pos++
minutes := uint8(paramValues[pos])
pos++
seconds := uint8(paramValues[pos])
pos++
return pos, fmt.Sprintf("%s%d %02d:%02d:%02d", sign, days, hours, minutes, seconds)
}
func parseBinaryDurationWithMS(pos int, paramValues []byte,
isNegative uint8) (int, string) {
pos, dur := parseBinaryDuration(pos, paramValues, isNegative)
microSecond := binary.LittleEndian.Uint32(paramValues[pos : pos+4])
pos += 4
return pos, fmt.Sprintf("%s.%06d", dur, microSecond)
}
func (cc *clientConn) handleStmtClose(data []byte) (err error) {
if len(data) < 4 {
return
}
stmtID := int(binary.LittleEndian.Uint32(data[0:4]))
stmt := cc.ctx.GetStatement(stmtID)
if stmt != nil {
return stmt.Close()
}
return
}
func (cc *clientConn) handleStmtSendLongData(data []byte) (err error) {
if len(data) < 6 {
return mysql.ErrMalformPacket
}
stmtID := int(binary.LittleEndian.Uint32(data[0:4]))
stmt := cc.ctx.GetStatement(stmtID)
if stmt == nil {
return mysql.NewErr(mysql.ErrUnknownStmtHandler,
strconv.Itoa(stmtID), "stmt_send_longdata")
}
paramID := int(binary.LittleEndian.Uint16(data[4:6]))
return stmt.AppendParam(paramID, data[6:])
}
func (cc *clientConn) handleStmtReset(ctx context.Context, data []byte) (err error) {
if len(data) < 4 {
return mysql.ErrMalformPacket
}
stmtID := int(binary.LittleEndian.Uint32(data[0:4]))
stmt := cc.ctx.GetStatement(stmtID)
if stmt == nil {
return mysql.NewErr(mysql.ErrUnknownStmtHandler,
strconv.Itoa(stmtID), "stmt_reset")
}
stmt.Reset()
stmt.StoreResultSet(nil)
return cc.writeOK(ctx)
}
// handleSetOption refer to https://dev.mysql.com/doc/internals/en/com-set-option.html
func (cc *clientConn) handleSetOption(ctx context.Context, data []byte) (err error) {
if len(data) < 2 {
return mysql.ErrMalformPacket
}
switch binary.LittleEndian.Uint16(data[:2]) {
case 0:
cc.capability |= mysql.ClientMultiStatements
cc.ctx.SetClientCapability(cc.capability)
case 1:
cc.capability &^= mysql.ClientMultiStatements
cc.ctx.SetClientCapability(cc.capability)
default:
return mysql.ErrMalformPacket
}
if err = cc.writeEOF(0); err != nil {
return err
}
return cc.flush(ctx)
}
func (cc *clientConn) preparedStmt2String(stmtID uint32) string {
sv := cc.ctx.GetSessionVars()
if sv == nil {
return ""
}
if sv.EnableRedactLog {
return cc.preparedStmt2StringNoArgs(stmtID)
}
return cc.preparedStmt2StringNoArgs(stmtID) + sv.PreparedParams.String()
}
func (cc *clientConn) preparedStmt2StringNoArgs(stmtID uint32) string {
sv := cc.ctx.GetSessionVars()
if sv == nil {
return ""
}
preparedPointer, ok := sv.PreparedStmts[stmtID]
if !ok {
return "prepared statement not found, ID: " + strconv.FormatUint(uint64(stmtID), 10)
}
preparedObj, ok := preparedPointer.(*plannercore.CachedPrepareStmt)
if !ok {
return "invalidate CachedPrepareStmt type, ID: " + strconv.FormatUint(uint64(stmtID), 10)
}
preparedAst := preparedObj.PreparedAst
return preparedAst.Stmt.Text()
}