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codec.go
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codec.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 codec
import (
"encoding/binary"
"time"
"github.com/hanchuanchuan/goInception/mysql"
"github.com/hanchuanchuan/goInception/sessionctx/stmtctx"
"github.com/hanchuanchuan/goInception/terror"
"github.com/hanchuanchuan/goInception/types"
"github.com/hanchuanchuan/goInception/types/json"
"github.com/hanchuanchuan/goInception/util/chunk"
"github.com/pingcap/errors"
)
// First byte in the encoded value which specifies the encoding type.
const (
NilFlag byte = 0
bytesFlag byte = 1
compactBytesFlag byte = 2
intFlag byte = 3
uintFlag byte = 4
floatFlag byte = 5
decimalFlag byte = 6
durationFlag byte = 7
varintFlag byte = 8
uvarintFlag byte = 9
jsonFlag byte = 10
maxFlag byte = 250
)
// encode will encode a datum and append it to a byte slice. If comparable is true, the encoded bytes can be sorted as it's original order.
// If hash is true, the encoded bytes can be checked equal as it's original value.
func encode(sc *stmtctx.StatementContext, b []byte, vals []types.Datum, comparable bool, hash bool) (_ []byte, err error) {
for i, length := 0, len(vals); i < length; i++ {
switch vals[i].Kind() {
case types.KindInt64:
b = encodeSignedInt(b, vals[i].GetInt64(), comparable)
case types.KindUint64:
if hash {
integer := vals[i].GetInt64()
if integer < 0 {
b = encodeUnsignedInt(b, uint64(integer), comparable)
} else {
b = encodeSignedInt(b, integer, comparable)
}
} else {
b = encodeUnsignedInt(b, vals[i].GetUint64(), comparable)
}
case types.KindFloat32, types.KindFloat64:
b = append(b, floatFlag)
b = EncodeFloat(b, vals[i].GetFloat64())
case types.KindString, types.KindBytes:
b = encodeBytes(b, vals[i].GetBytes(), comparable)
case types.KindMysqlTime:
b = append(b, uintFlag)
t := vals[i].GetMysqlTime()
// Encoding timestamp need to consider timezone.
// If it's not in UTC, transform to UTC first.
if t.Type == mysql.TypeTimestamp && sc.TimeZone != time.UTC {
err = t.ConvertTimeZone(sc.TimeZone, time.UTC)
if err != nil {
return nil, errors.Trace(err)
}
}
var v uint64
v, err = t.ToPackedUint()
if err != nil {
return nil, errors.Trace(err)
}
b = EncodeUint(b, v)
case types.KindMysqlDuration:
// duration may have negative value, so we cannot use String to encode directly.
b = append(b, durationFlag)
b = EncodeInt(b, int64(vals[i].GetMysqlDuration().Duration))
case types.KindMysqlDecimal:
b = append(b, decimalFlag)
if hash {
// If hash is true, we only consider the original value of this decimal and ignore it's precision.
dec := vals[i].GetMysqlDecimal()
precision, frac := dec.PrecisionAndFrac()
var bin []byte
bin, err = dec.ToBin(precision, frac)
if err != nil {
return nil, errors.Trace(err)
}
b = append(b, bin...)
} else {
b, err = EncodeDecimal(b, vals[i].GetMysqlDecimal(), vals[i].Length(), vals[i].Frac())
if terror.ErrorEqual(err, types.ErrTruncated) {
err = sc.HandleTruncate(err)
} else if terror.ErrorEqual(err, types.ErrOverflow) {
err = sc.HandleOverflow(err, err)
}
}
case types.KindMysqlEnum:
b = encodeUnsignedInt(b, uint64(vals[i].GetMysqlEnum().ToNumber()), comparable)
case types.KindMysqlSet:
b = encodeUnsignedInt(b, uint64(vals[i].GetMysqlSet().ToNumber()), comparable)
case types.KindMysqlBit, types.KindBinaryLiteral:
// We don't need to handle errors here since the literal is ensured to be able to store in uint64 in convertToMysqlBit.
var val uint64
val, err = vals[i].GetBinaryLiteral().ToInt(sc)
terror.Log(errors.Trace(err))
b = encodeUnsignedInt(b, val, comparable)
case types.KindMysqlJSON:
b = append(b, jsonFlag)
j := vals[i].GetMysqlJSON()
b = append(b, j.TypeCode)
b = append(b, j.Value...)
case types.KindNull:
b = append(b, NilFlag)
case types.KindMinNotNull:
b = append(b, bytesFlag)
case types.KindMaxValue:
b = append(b, maxFlag)
default:
return nil, errors.Errorf("unsupport encode type %d", vals[i].Kind())
}
}
return b, errors.Trace(err)
}
func encodeBytes(b []byte, v []byte, comparable bool) []byte {
if comparable {
b = append(b, bytesFlag)
b = EncodeBytes(b, v)
} else {
b = append(b, compactBytesFlag)
b = EncodeCompactBytes(b, v)
}
return b
}
func encodeSignedInt(b []byte, v int64, comparable bool) []byte {
if comparable {
b = append(b, intFlag)
b = EncodeInt(b, v)
} else {
b = append(b, varintFlag)
b = EncodeVarint(b, v)
}
return b
}
func encodeUnsignedInt(b []byte, v uint64, comparable bool) []byte {
if comparable {
b = append(b, uintFlag)
b = EncodeUint(b, v)
} else {
b = append(b, uvarintFlag)
b = EncodeUvarint(b, v)
}
return b
}
// EncodeKey appends the encoded values to byte slice b, returns the appended
// slice. It guarantees the encoded value is in ascending order for comparison.
// For Decimal type, datum must set datum's length and frac.
func EncodeKey(sc *stmtctx.StatementContext, b []byte, v ...types.Datum) ([]byte, error) {
return encode(sc, b, v, true, false)
}
// EncodeValue appends the encoded values to byte slice b, returning the appended
// slice. It does not guarantee the order for comparison.
func EncodeValue(sc *stmtctx.StatementContext, b []byte, v ...types.Datum) ([]byte, error) {
return encode(sc, b, v, false, false)
}
func encodeChunkRow(sc *stmtctx.StatementContext, b []byte, row chunk.Row, allTypes []*types.FieldType, colIdx []int, comparable, hash bool) (_ []byte, err error) {
for _, i := range colIdx {
if row.IsNull(i) {
b = append(b, NilFlag)
continue
}
switch allTypes[i].Tp {
case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeYear:
if !mysql.HasUnsignedFlag(allTypes[i].Flag) {
b = encodeSignedInt(b, row.GetInt64(i), comparable)
break
}
// encode unsigned integers.
if hash {
integer := row.GetInt64(i)
if integer < 0 {
b = encodeUnsignedInt(b, uint64(integer), comparable)
} else {
b = encodeSignedInt(b, integer, comparable)
}
} else {
b = encodeUnsignedInt(b, row.GetUint64(i), comparable)
}
case mysql.TypeFloat:
b = append(b, floatFlag)
b = EncodeFloat(b, float64(row.GetFloat32(i)))
case mysql.TypeDouble:
b = append(b, floatFlag)
b = EncodeFloat(b, row.GetFloat64(i))
case mysql.TypeVarchar, mysql.TypeVarString, mysql.TypeString, mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob:
b = encodeBytes(b, row.GetBytes(i), comparable)
case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
b = append(b, uintFlag)
t := row.GetTime(i)
// Encoding timestamp need to consider timezone.
// If it's not in UTC, transform to UTC first.
if t.Type == mysql.TypeTimestamp && sc.TimeZone != time.UTC {
err = t.ConvertTimeZone(sc.TimeZone, time.UTC)
if err != nil {
return nil, errors.Trace(err)
}
}
var v uint64
v, err = t.ToPackedUint()
if err != nil {
return nil, errors.Trace(err)
}
b = EncodeUint(b, v)
case mysql.TypeDuration:
// duration may have negative value, so we cannot use String to encode directly.
b = append(b, durationFlag)
b = EncodeInt(b, int64(row.GetDuration(i, 0).Duration))
case mysql.TypeNewDecimal:
b = append(b, decimalFlag)
if hash {
// If hash is true, we only consider the original value of this decimal and ignore it's precision.
dec := row.GetMyDecimal(i)
precision, frac := dec.PrecisionAndFrac()
var bin []byte
bin, err = dec.ToBin(precision, frac)
if err != nil {
return nil, errors.Trace(err)
}
b = append(b, bin...)
} else {
b, err = EncodeDecimal(b, row.GetMyDecimal(i), allTypes[i].Flen, allTypes[i].Decimal)
if terror.ErrorEqual(err, types.ErrTruncated) {
err = sc.HandleTruncate(err)
}
}
case mysql.TypeEnum:
b = encodeUnsignedInt(b, uint64(row.GetEnum(i).ToNumber()), comparable)
case mysql.TypeSet:
b = encodeUnsignedInt(b, uint64(row.GetSet(i).ToNumber()), comparable)
case mysql.TypeBit:
// We don't need to handle errors here since the literal is ensured to be able to store in uint64 in convertToMysqlBit.
var val uint64
val, err = types.BinaryLiteral(row.GetBytes(i)).ToInt(sc)
terror.Log(errors.Trace(err))
b = encodeUnsignedInt(b, val, comparable)
case mysql.TypeJSON:
b = append(b, jsonFlag)
j := row.GetJSON(i)
b = append(b, j.TypeCode)
b = append(b, j.Value...)
default:
return nil, errors.Errorf("unsupport column type for encode %d", allTypes[i].Tp)
}
}
return b, errors.Trace(err)
}
// HashValues appends the encoded values to byte slice b, returning the appended
// slice. If two datums are equal, they will generate the same bytes.
func HashValues(sc *stmtctx.StatementContext, b []byte, v ...types.Datum) ([]byte, error) {
return encode(sc, b, v, false, true)
}
// HashChunkRow appends the encoded values to byte slice "b", returning the appended slice.
// If two rows are equal, it will generate the same bytes.
func HashChunkRow(sc *stmtctx.StatementContext, b []byte, row chunk.Row, allTypes []*types.FieldType, colIdx []int) ([]byte, error) {
return encodeChunkRow(sc, b, row, allTypes, colIdx, false, true)
}
// Decode decodes values from a byte slice generated with EncodeKey or EncodeValue
// before.
// size is the size of decoded datum slice.
func Decode(b []byte, size int) ([]types.Datum, error) {
if len(b) < 1 {
return nil, errors.New("invalid encoded key")
}
var (
err error
values = make([]types.Datum, 0, size)
)
for len(b) > 0 {
var d types.Datum
b, d, err = DecodeOne(b)
if err != nil {
return nil, errors.Trace(err)
}
values = append(values, d)
}
return values, nil
}
// DecodeRange decodes the range values from a byte slice that generated by EncodeKey.
// It handles some special values like `MinNotNull` and `MaxValueDatum`.
func DecodeRange(b []byte, size int) ([]types.Datum, error) {
if len(b) < 1 {
return nil, errors.New("invalid encoded key: length of key is zero")
}
var (
err error
values = make([]types.Datum, 0, size)
)
for len(b) > 1 {
var d types.Datum
b, d, err = DecodeOne(b)
if err != nil {
return nil, errors.Trace(err)
}
values = append(values, d)
}
if len(b) == 1 {
switch b[0] {
case NilFlag:
values = append(values, types.Datum{})
case bytesFlag:
values = append(values, types.MinNotNullDatum())
// `maxFlag + 1` for PrefixNext
case maxFlag, maxFlag + 1:
values = append(values, types.MaxValueDatum())
default:
return nil, errors.Errorf("invalid encoded key flag %v", b[0])
}
}
return values, nil
}
// DecodeOne decodes on datum from a byte slice generated with EncodeKey or EncodeValue.
func DecodeOne(b []byte) (remain []byte, d types.Datum, err error) {
if len(b) < 1 {
return nil, d, errors.New("invalid encoded key")
}
flag := b[0]
b = b[1:]
switch flag {
case intFlag:
var v int64
b, v, err = DecodeInt(b)
d.SetInt64(v)
case uintFlag:
var v uint64
b, v, err = DecodeUint(b)
d.SetUint64(v)
case varintFlag:
var v int64
b, v, err = DecodeVarint(b)
d.SetInt64(v)
case uvarintFlag:
var v uint64
b, v, err = DecodeUvarint(b)
d.SetUint64(v)
case floatFlag:
var v float64
b, v, err = DecodeFloat(b)
d.SetFloat64(v)
case bytesFlag:
var v []byte
b, v, err = DecodeBytes(b, nil)
d.SetBytes(v)
case compactBytesFlag:
var v []byte
b, v, err = DecodeCompactBytes(b)
d.SetBytes(v)
case decimalFlag:
var (
dec *types.MyDecimal
precision, frac int
)
b, dec, precision, frac, err = DecodeDecimal(b)
if err == nil {
d.SetMysqlDecimal(dec)
d.SetLength(precision)
d.SetFrac(frac)
}
case durationFlag:
var r int64
b, r, err = DecodeInt(b)
if err == nil {
// use max fsp, let outer to do round manually.
v := types.Duration{Duration: time.Duration(r), Fsp: types.MaxFsp}
d.SetValue(v)
}
case jsonFlag:
var size int
size, err = json.PeekBytesAsJSON(b)
if err != nil {
return b, d, err
}
j := json.BinaryJSON{TypeCode: b[0], Value: b[1:size]}
d.SetMysqlJSON(j)
b = b[size:]
case NilFlag:
default:
return b, d, errors.Errorf("invalid encoded key flag %v", flag)
}
if err != nil {
return b, d, errors.Trace(err)
}
return b, d, nil
}
// CutOne cuts the first encoded value from b.
// It will return the first encoded item and the remains as byte slice.
func CutOne(b []byte) (data []byte, remain []byte, err error) {
l, err := peek(b)
if err != nil {
return nil, nil, errors.Trace(err)
}
return b[:l], b[l:], nil
}
// SetRawValues set raw datum values from a row data.
func SetRawValues(data []byte, values []types.Datum) error {
for i := 0; i < len(values); i++ {
l, err := peek(data)
if err != nil {
return errors.Trace(err)
}
values[i].SetRaw(data[:l:l])
data = data[l:]
}
return nil
}
// peek peeks the first encoded value from b and returns its length.
func peek(b []byte) (length int, err error) {
if len(b) < 1 {
return 0, errors.New("invalid encoded key")
}
flag := b[0]
length++
b = b[1:]
var l int
switch flag {
case NilFlag:
case intFlag, uintFlag, floatFlag, durationFlag:
// Those types are stored in 8 bytes.
l = 8
case bytesFlag:
l, err = peekBytes(b, false)
case compactBytesFlag:
l, err = peekCompactBytes(b)
case decimalFlag:
l, err = types.DecimalPeak(b)
case varintFlag:
l, err = peekVarint(b)
case uvarintFlag:
l, err = peekUvarint(b)
case jsonFlag:
l, err = json.PeekBytesAsJSON(b)
default:
return 0, errors.Errorf("invalid encoded key flag %v", flag)
}
if err != nil {
return 0, errors.Trace(err)
}
length += l
return
}
func peekBytes(b []byte, reverse bool) (int, error) {
offset := 0
for {
if len(b) < offset+encGroupSize+1 {
return 0, errors.New("insufficient bytes to decode value")
}
// The byte slice is encoded into many groups.
// For each group, there are 8 bytes for data and 1 byte for marker.
marker := b[offset+encGroupSize]
var padCount byte
if reverse {
padCount = marker
} else {
padCount = encMarker - marker
}
offset += encGroupSize + 1
// When padCount is not zero, it means we get the end of the byte slice.
if padCount != 0 {
break
}
}
return offset, nil
}
func peekCompactBytes(b []byte) (int, error) {
// Get length.
v, n := binary.Varint(b)
vi := int(v)
if n < 0 {
return 0, errors.New("value larger than 64 bits")
} else if n == 0 {
return 0, errors.New("insufficient bytes to decode value")
}
if len(b) < vi+n {
return 0, errors.Errorf("insufficient bytes to decode value, expected length: %v", n)
}
return n + vi, nil
}
func peekVarint(b []byte) (int, error) {
_, n := binary.Varint(b)
if n < 0 {
return 0, errors.New("value larger than 64 bits")
}
return n, nil
}
func peekUvarint(b []byte) (int, error) {
_, n := binary.Uvarint(b)
if n < 0 {
return 0, errors.New("value larger than 64 bits")
}
return n, nil
}
// Decoder is used to decode value to chunk.
type Decoder struct {
chk *chunk.Chunk
timezone *time.Location
// buf is only used for DecodeBytes to avoid the cost of makeslice.
buf []byte
}
// NewDecoder creates a Decoder.
func NewDecoder(chk *chunk.Chunk, timezone *time.Location) *Decoder {
return &Decoder{
chk: chk,
timezone: timezone,
}
}
// DecodeOne decodes one value to chunk and returns the remained bytes.
func (decoder *Decoder) DecodeOne(b []byte, colIdx int, ft *types.FieldType) (remain []byte, err error) {
if len(b) < 1 {
return nil, errors.New("invalid encoded key")
}
chk := decoder.chk
flag := b[0]
b = b[1:]
switch flag {
case intFlag:
var v int64
b, v, err = DecodeInt(b)
if err != nil {
return nil, errors.Trace(err)
}
appendIntToChunk(v, chk, colIdx, ft)
case uintFlag:
var v uint64
b, v, err = DecodeUint(b)
if err != nil {
return nil, errors.Trace(err)
}
err = appendUintToChunk(v, chk, colIdx, ft, decoder.timezone)
case varintFlag:
var v int64
b, v, err = DecodeVarint(b)
if err != nil {
return nil, errors.Trace(err)
}
appendIntToChunk(v, chk, colIdx, ft)
case uvarintFlag:
var v uint64
b, v, err = DecodeUvarint(b)
if err != nil {
return nil, errors.Trace(err)
}
err = appendUintToChunk(v, chk, colIdx, ft, decoder.timezone)
case floatFlag:
var v float64
b, v, err = DecodeFloat(b)
if err != nil {
return nil, errors.Trace(err)
}
appendFloatToChunk(v, chk, colIdx, ft)
case bytesFlag:
b, decoder.buf, err = DecodeBytes(b, decoder.buf)
if err != nil {
return nil, errors.Trace(err)
}
chk.AppendBytes(colIdx, decoder.buf)
case compactBytesFlag:
var v []byte
b, v, err = DecodeCompactBytes(b)
if err != nil {
return nil, errors.Trace(err)
}
chk.AppendBytes(colIdx, v)
case decimalFlag:
var dec *types.MyDecimal
b, dec, _, _, err = DecodeDecimal(b)
if err != nil {
return nil, errors.Trace(err)
}
chk.AppendMyDecimal(colIdx, dec)
case durationFlag:
var r int64
b, r, err = DecodeInt(b)
if err != nil {
return nil, errors.Trace(err)
}
v := types.Duration{Duration: time.Duration(r), Fsp: ft.Decimal}
chk.AppendDuration(colIdx, v)
case jsonFlag:
var size int
size, err = json.PeekBytesAsJSON(b)
if err != nil {
return nil, errors.Trace(err)
}
chk.AppendJSON(colIdx, json.BinaryJSON{TypeCode: b[0], Value: b[1:size]})
b = b[size:]
case NilFlag:
chk.AppendNull(colIdx)
default:
return nil, errors.Errorf("invalid encoded key flag %v", flag)
}
if err != nil {
return nil, errors.Trace(err)
}
return b, nil
}
func appendIntToChunk(val int64, chk *chunk.Chunk, colIdx int, ft *types.FieldType) {
switch ft.Tp {
case mysql.TypeDuration:
v := types.Duration{Duration: time.Duration(val), Fsp: ft.Decimal}
chk.AppendDuration(colIdx, v)
default:
chk.AppendInt64(colIdx, val)
}
}
func appendUintToChunk(val uint64, chk *chunk.Chunk, colIdx int, ft *types.FieldType, loc *time.Location) error {
switch ft.Tp {
case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
var t types.Time
t.Type = ft.Tp
t.Fsp = ft.Decimal
var err error
err = t.FromPackedUint(val)
if err != nil {
return errors.Trace(err)
}
if ft.Tp == mysql.TypeTimestamp && !t.IsZero() {
err = t.ConvertTimeZone(time.UTC, loc)
if err != nil {
return errors.Trace(err)
}
}
chk.AppendTime(colIdx, t)
case mysql.TypeEnum:
// ignore error deliberately, to read empty enum value.
enum, err := types.ParseEnumValue(ft.Elems, val)
if err != nil {
enum = types.Enum{}
}
chk.AppendEnum(colIdx, enum)
case mysql.TypeSet:
set, err := types.ParseSetValue(ft.Elems, val)
if err != nil {
return errors.Trace(err)
}
chk.AppendSet(colIdx, set)
case mysql.TypeBit:
byteSize := (ft.Flen + 7) >> 3
chk.AppendBytes(colIdx, types.NewBinaryLiteralFromUint(val, byteSize))
default:
chk.AppendUint64(colIdx, val)
}
return nil
}
func appendFloatToChunk(val float64, chk *chunk.Chunk, colIdx int, ft *types.FieldType) {
if ft.Tp == mysql.TypeFloat {
chk.AppendFloat32(colIdx, float32(val))
} else {
chk.AppendFloat64(colIdx, val)
}
}