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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 (
"bytes"
"encoding/binary"
"io"
"math"
"net/http"
"strconv"
"time"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/hack"
)
func parseNullTermString(b []byte) (str []byte, remain []byte) {
off := bytes.IndexByte(b, 0)
if off == -1 {
return nil, b
}
return b[:off], b[off+1:]
}
func parseLengthEncodedInt(b []byte) (num uint64, isNull bool, n int) {
switch b[0] {
// 251: NULL
case 0xfb:
n = 1
isNull = true
return
// 252: value of following 2
case 0xfc:
num = uint64(b[1]) | uint64(b[2])<<8
n = 3
return
// 253: value of following 3
case 0xfd:
num = uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16
n = 4
return
// 254: value of following 8
case 0xfe:
num = uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16 |
uint64(b[4])<<24 | uint64(b[5])<<32 | uint64(b[6])<<40 |
uint64(b[7])<<48 | uint64(b[8])<<56
n = 9
return
}
// https://dev.mysql.com/doc/internals/en/integer.html#length-encoded-integer: If the first byte of a packet is a length-encoded integer and its byte value is 0xfe, you must check the length of the packet to verify that it has enough space for a 8-byte integer.
// TODO: 0xff is undefined
// 0-250: value of first byte
num = uint64(b[0])
n = 1
return
}
func dumpLengthEncodedInt(buffer []byte, n uint64) []byte {
switch {
case n <= 250:
return append(buffer, tinyIntCache[n]...)
case n <= 0xffff:
return append(buffer, 0xfc, byte(n), byte(n>>8))
case n <= 0xffffff:
return append(buffer, 0xfd, byte(n), byte(n>>8), byte(n>>16))
case n <= 0xffffffffffffffff:
return append(buffer, 0xfe, byte(n), byte(n>>8), byte(n>>16), byte(n>>24),
byte(n>>32), byte(n>>40), byte(n>>48), byte(n>>56))
}
return buffer
}
func parseLengthEncodedBytes(b []byte) ([]byte, bool, int, error) {
// Get length
num, isNull, n := parseLengthEncodedInt(b)
if num < 1 {
return nil, isNull, n, nil
}
n += int(num)
// Check data length
if len(b) >= n {
return b[n-int(num) : n], false, n, nil
}
return nil, false, n, io.EOF
}
func dumpLengthEncodedString(buffer []byte, bytes []byte) []byte {
buffer = dumpLengthEncodedInt(buffer, uint64(len(bytes)))
buffer = append(buffer, bytes...)
return buffer
}
func dumpUint16(buffer []byte, n uint16) []byte {
buffer = append(buffer, byte(n))
buffer = append(buffer, byte(n>>8))
return buffer
}
func dumpUint32(buffer []byte, n uint32) []byte {
buffer = append(buffer, byte(n))
buffer = append(buffer, byte(n>>8))
buffer = append(buffer, byte(n>>16))
buffer = append(buffer, byte(n>>24))
return buffer
}
func dumpUint64(buffer []byte, n uint64) []byte {
buffer = append(buffer, byte(n))
buffer = append(buffer, byte(n>>8))
buffer = append(buffer, byte(n>>16))
buffer = append(buffer, byte(n>>24))
buffer = append(buffer, byte(n>>32))
buffer = append(buffer, byte(n>>40))
buffer = append(buffer, byte(n>>48))
buffer = append(buffer, byte(n>>56))
return buffer
}
var tinyIntCache [251][]byte
func init() {
for i := 0; i < len(tinyIntCache); i++ {
tinyIntCache[i] = []byte{byte(i)}
}
}
func dumpBinaryTime(dur time.Duration) (data []byte) {
if dur == 0 {
data = tinyIntCache[0]
return
}
data = make([]byte, 13)
data[0] = 12
if dur < 0 {
data[1] = 1
dur = -dur
}
days := dur / (24 * time.Hour)
dur -= days * 24 * time.Hour
data[2] = byte(days)
hours := dur / time.Hour
dur -= hours * time.Hour
data[6] = byte(hours)
minutes := dur / time.Minute
dur -= minutes * time.Minute
data[7] = byte(minutes)
seconds := dur / time.Second
dur -= seconds * time.Second
data[8] = byte(seconds)
if dur == 0 {
data[0] = 8
return data[:9]
}
binary.LittleEndian.PutUint32(data[9:13], uint32(dur/time.Microsecond))
return
}
func dumpBinaryDateTime(data []byte, t types.Time) []byte {
year, mon, day := t.Year(), t.Month(), t.Day()
switch t.Type() {
case mysql.TypeTimestamp, mysql.TypeDatetime:
if t.IsZero() {
// All zero.
data = append(data, 0)
} else if t.Microsecond() != 0 {
// Has micro seconds.
data = append(data, 11)
data = dumpUint16(data, uint16(year))
data = append(data, byte(mon), byte(day), byte(t.Hour()), byte(t.Minute()), byte(t.Second()))
data = dumpUint32(data, uint32(t.Microsecond()))
} else if t.Hour() != 0 || t.Minute() != 0 || t.Second() != 0 {
// Has HH:MM:SS
data = append(data, 7)
data = dumpUint16(data, uint16(year))
data = append(data, byte(mon), byte(day), byte(t.Hour()), byte(t.Minute()), byte(t.Second()))
} else {
// Only YY:MM:DD
data = append(data, 4)
data = dumpUint16(data, uint16(year))
data = append(data, byte(mon), byte(day))
}
case mysql.TypeDate:
if t.IsZero() {
data = append(data, 0)
} else {
data = append(data, 4)
data = dumpUint16(data, uint16(year)) //year
data = append(data, byte(mon), byte(day))
}
}
return data
}
func dumpBinaryRow(buffer []byte, columns []*ColumnInfo, row chunk.Row) ([]byte, error) {
buffer = append(buffer, mysql.OKHeader)
nullBitmapOff := len(buffer)
numBytes4Null := (len(columns) + 7 + 2) / 8
for i := 0; i < numBytes4Null; i++ {
buffer = append(buffer, 0)
}
for i := range columns {
if row.IsNull(i) {
bytePos := (i + 2) / 8
bitPos := byte((i + 2) % 8)
buffer[nullBitmapOff+bytePos] |= 1 << bitPos
continue
}
switch columns[i].Type {
case mysql.TypeTiny:
buffer = append(buffer, byte(row.GetInt64(i)))
case mysql.TypeShort, mysql.TypeYear:
buffer = dumpUint16(buffer, uint16(row.GetInt64(i)))
case mysql.TypeInt24, mysql.TypeLong:
buffer = dumpUint32(buffer, uint32(row.GetInt64(i)))
case mysql.TypeLonglong:
buffer = dumpUint64(buffer, row.GetUint64(i))
case mysql.TypeFloat:
buffer = dumpUint32(buffer, math.Float32bits(row.GetFloat32(i)))
case mysql.TypeDouble:
buffer = dumpUint64(buffer, math.Float64bits(row.GetFloat64(i)))
case mysql.TypeNewDecimal:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetMyDecimal(i).String()))
case mysql.TypeString, mysql.TypeVarString, mysql.TypeVarchar, mysql.TypeBit,
mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob, mysql.TypeBlob:
buffer = dumpLengthEncodedString(buffer, row.GetBytes(i))
case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
buffer = dumpBinaryDateTime(buffer, row.GetTime(i))
case mysql.TypeDuration:
buffer = append(buffer, dumpBinaryTime(row.GetDuration(i, 0).Duration)...)
case mysql.TypeEnum:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetEnum(i).String()))
case mysql.TypeSet:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetSet(i).String()))
case mysql.TypeJSON:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetJSON(i).String()))
default:
return nil, errInvalidType.GenWithStack("invalid type %v", columns[i].Type)
}
}
return buffer, nil
}
func dumpTextRow(buffer []byte, columns []*ColumnInfo, row chunk.Row) ([]byte, error) {
tmp := make([]byte, 0, 20)
for i, col := range columns {
if row.IsNull(i) {
buffer = append(buffer, 0xfb)
continue
}
switch col.Type {
case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong:
tmp = strconv.AppendInt(tmp[:0], row.GetInt64(i), 10)
buffer = dumpLengthEncodedString(buffer, tmp)
case mysql.TypeYear:
year := row.GetInt64(i)
tmp = tmp[:0]
if year == 0 {
tmp = append(tmp, '0', '0', '0', '0')
} else {
tmp = strconv.AppendInt(tmp, year, 10)
}
buffer = dumpLengthEncodedString(buffer, tmp)
case mysql.TypeLonglong:
if mysql.HasUnsignedFlag(uint(columns[i].Flag)) {
tmp = strconv.AppendUint(tmp[:0], row.GetUint64(i), 10)
} else {
tmp = strconv.AppendInt(tmp[:0], row.GetInt64(i), 10)
}
buffer = dumpLengthEncodedString(buffer, tmp)
case mysql.TypeFloat:
prec := -1
if columns[i].Decimal > 0 && int(col.Decimal) != mysql.NotFixedDec {
prec = int(col.Decimal)
}
tmp = appendFormatFloat(tmp[:0], float64(row.GetFloat32(i)), prec, 32)
buffer = dumpLengthEncodedString(buffer, tmp)
case mysql.TypeDouble:
prec := types.UnspecifiedLength
if col.Decimal > 0 && int(col.Decimal) != mysql.NotFixedDec {
prec = int(col.Decimal)
}
tmp = appendFormatFloat(tmp[:0], row.GetFloat64(i), prec, 64)
buffer = dumpLengthEncodedString(buffer, tmp)
case mysql.TypeNewDecimal:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetMyDecimal(i).String()))
case mysql.TypeString, mysql.TypeVarString, mysql.TypeVarchar, mysql.TypeBit,
mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob, mysql.TypeBlob:
buffer = dumpLengthEncodedString(buffer, row.GetBytes(i))
case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetTime(i).String()))
case mysql.TypeDuration:
dur := row.GetDuration(i, int(col.Decimal))
buffer = dumpLengthEncodedString(buffer, hack.Slice(dur.String()))
case mysql.TypeEnum:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetEnum(i).String()))
case mysql.TypeSet:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetSet(i).String()))
case mysql.TypeJSON:
buffer = dumpLengthEncodedString(buffer, hack.Slice(row.GetJSON(i).String()))
default:
return nil, errInvalidType.GenWithStack("invalid type %v", columns[i].Type)
}
}
return buffer, nil
}
func lengthEncodedIntSize(n uint64) int {
switch {
case n <= 250:
return 1
case n <= 0xffff:
return 3
case n <= 0xffffff:
return 4
}
return 9
}
const (
expFormatBig = 1e15
expFormatSmall = 1e-15
defaultMySQLPrec = 5
)
func appendFormatFloat(in []byte, fVal float64, prec, bitSize int) []byte {
absVal := math.Abs(fVal)
if absVal > math.MaxFloat64 || math.IsNaN(absVal) {
return []byte{'0'}
}
isEFormat := false
if bitSize == 32 {
isEFormat = (prec == types.UnspecifiedLength && (float32(absVal) >= expFormatBig || (float32(absVal) != 0 && float32(absVal) < expFormatSmall)))
} else {
isEFormat = (prec == types.UnspecifiedLength && (absVal >= expFormatBig || (absVal != 0 && absVal < expFormatSmall)))
}
var out []byte
if isEFormat {
if bitSize == 32 {
prec = defaultMySQLPrec
}
out = strconv.AppendFloat(in, fVal, 'e', prec, bitSize)
valStr := out[len(in):]
// remove the '+' from the string for compatibility.
plusPos := bytes.IndexByte(valStr, '+')
if plusPos > 0 {
plusPosInOut := len(in) + plusPos
out = append(out[:plusPosInOut], out[plusPosInOut+1:]...)
}
// remove extra '0'
ePos := bytes.IndexByte(valStr, 'e')
pointPos := bytes.IndexByte(valStr, '.')
ePosInOut := len(in) + ePos
pointPosInOut := len(in) + pointPos
validPos := ePosInOut
for i := ePosInOut - 1; i >= pointPosInOut; i-- {
if out[i] == '0' || out[i] == '.' {
validPos = i
} else {
break
}
}
out = append(out[:validPos], out[ePosInOut:]...)
} else {
out = strconv.AppendFloat(in, fVal, 'f', prec, bitSize)
}
return out
}
// CorsHandler adds Cors Header if `cors` config is set.
type CorsHandler struct {
handler http.Handler
cfg *config.Config
}
func (h CorsHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if h.cfg.Cors != "" {
w.Header().Set("Access-Control-Allow-Origin", h.cfg.Cors)
w.Header().Set("Access-Control-Allow-Methods", "GET")
}
h.handler.ServeHTTP(w, req)
}