forked from vitessio/vitess
/
binlog_event_rbr.go
1088 lines (996 loc) · 31.1 KB
/
binlog_event_rbr.go
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package replication
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"strconv"
"time"
"github.com/youtube/vitess/go/sqltypes"
querypb "github.com/youtube/vitess/go/vt/proto/query"
)
// ZeroTimestamp is the special value 0 for a timestamp.
var ZeroTimestamp = []byte("0000-00-00 00:00:00")
// TableMap implements BinlogEvent.TableMap().
//
// Expected format (L = total length of event data):
// # bytes field
// 4/6 table id
// 2 flags
// 1 schema name length sl
// sl schema name
// 1 [00]
// 1 table name length tl
// tl table name
// 1 [00]
// <var> column count cc (var-len encoded)
// cc column-def, one byte per column
// <var> column-meta-def (var-len encoded string)
// n NULL-bitmask, length: (cc + 7) / 8
func (ev binlogEvent) TableMap(f BinlogFormat) (*TableMap, error) {
data := ev.Bytes()[f.HeaderLength:]
result := &TableMap{}
pos := 6
if f.HeaderSize(eTableMapEvent) == 6 {
pos = 4
}
result.Flags = binary.LittleEndian.Uint16(data[pos : pos+2])
pos += 2
l := int(data[pos])
result.Database = string(data[pos+1 : pos+1+l])
pos += 1 + l + 1
l = int(data[pos])
result.Name = string(data[pos+1 : pos+1+l])
pos += 1 + l + 1
// FIXME(alainjobart) this is varlength encoded.
columnCount := int(data[pos])
pos++
result.Types = data[pos : pos+columnCount]
pos += columnCount
// FIXME(alainjobart) this is a var-len-string.
l = int(data[pos])
pos++
// Allocate and parse / copy Metadata.
result.Metadata = make([]uint16, columnCount)
expectedEnd := pos + l
for c := 0; c < columnCount; c++ {
var err error
result.Metadata[c], pos, err = metadataRead(data, pos, result.Types[c])
if err != nil {
return nil, err
}
}
if pos != expectedEnd {
return nil, fmt.Errorf("unexpected metadata end: got %v was expecting %v (data=%v)", pos, expectedEnd, data)
}
// A bit array that says if each colum can be NULL.
result.CanBeNull, _ = newBitmap(data, pos, columnCount)
return result, nil
}
// metadataLength returns how many bytes are used for metadata, based on a type.
func metadataLength(typ byte) int {
switch typ {
case TypeDecimal, TypeTiny, TypeShort, TypeLong, TypeNull, TypeTimestamp, TypeLongLong, TypeInt24, TypeDate, TypeTime, TypeDateTime, TypeYear, TypeNewDate:
// No data here.
return 0
case TypeFloat, TypeDouble, TypeTimestamp2, TypeDateTime2, TypeTime2, TypeJSON, TypeTinyBlob, TypeMediumBlob, TypeLongBlob, TypeBlob, TypeGeometry:
// One byte.
return 1
case TypeNewDecimal, TypeEnum, TypeSet, TypeString:
// Two bytes, Big Endian because of crazy encoding.
return 2
case TypeVarchar, TypeBit, TypeVarString:
// Two bytes, Little Endian
return 2
default:
// Unknown type. This is used in tests only, so panic.
panic(fmt.Errorf("metadataLength: unhandled data type: %v", typ))
}
}
// metadataTotalLength returns the total size of the metadata for an
// array of types.
func metadataTotalLength(types []byte) int {
sum := 0
for _, t := range types {
sum += metadataLength(t)
}
return sum
}
// metadataRead reads a single value from the metadata string.
func metadataRead(data []byte, pos int, typ byte) (uint16, int, error) {
switch typ {
case TypeDecimal, TypeTiny, TypeShort, TypeLong, TypeNull, TypeTimestamp, TypeLongLong, TypeInt24, TypeDate, TypeTime, TypeDateTime, TypeYear, TypeNewDate:
// No data here.
return 0, pos, nil
case TypeFloat, TypeDouble, TypeTimestamp2, TypeDateTime2, TypeTime2, TypeJSON, TypeTinyBlob, TypeMediumBlob, TypeLongBlob, TypeBlob, TypeGeometry:
// One byte.
return uint16(data[pos]), pos + 1, nil
case TypeNewDecimal, TypeEnum, TypeSet, TypeString:
// Two bytes, Big Endian because of crazy encoding.
return uint16(data[pos])<<8 + uint16(data[pos+1]), pos + 2, nil
case TypeVarchar, TypeBit, TypeVarString:
// Two bytes, Little Endian
return uint16(data[pos]) + uint16(data[pos+1])<<8, pos + 2, nil
default:
// Unknown types, we can't go on.
return 0, 0, fmt.Errorf("metadataRead: unhandled data type: %v", typ)
}
}
// metadataWrite writes a single value into the metadata string.
func metadataWrite(data []byte, pos int, typ byte, value uint16) int {
switch typ {
case TypeDecimal, TypeTiny, TypeShort, TypeLong, TypeNull, TypeTimestamp, TypeLongLong, TypeInt24, TypeDate, TypeTime, TypeDateTime, TypeYear, TypeNewDate:
// No data here.
return pos
case TypeFloat, TypeDouble, TypeTimestamp2, TypeDateTime2, TypeTime2, TypeJSON, TypeTinyBlob, TypeMediumBlob, TypeLongBlob, TypeBlob, TypeGeometry:
// One byte.
data[pos] = byte(value)
return pos + 1
case TypeNewDecimal, TypeEnum, TypeSet, TypeString:
// Two bytes, Big Endian because of crazy encoding.
data[pos] = byte(value >> 8)
data[pos+1] = byte(value)
return pos + 2
case TypeVarchar, TypeBit, TypeVarString:
// Two bytes, Little Endian
data[pos] = byte(value)
data[pos+1] = byte(value >> 8)
return pos + 2
default:
// Unknown type. This is used in tests only, so panic.
panic(fmt.Errorf("metadataRead: unhandled data type: %v", typ))
}
}
var dig2bytes = []int{0, 1, 1, 2, 2, 3, 3, 4, 4, 4}
// cellLength returns the new position after the field with the given
// type is read.
func cellLength(data []byte, pos int, typ byte, metadata uint16) (int, error) {
switch typ {
case TypeNull:
return 0, nil
case TypeTiny, TypeYear:
return 1, nil
case TypeShort:
return 2, nil
case TypeInt24:
return 3, nil
case TypeLong, TypeFloat, TypeTimestamp:
return 4, nil
case TypeLongLong, TypeDouble:
return 8, nil
case TypeDate, TypeTime, TypeNewDate:
return 3, nil
case TypeDateTime:
return 8, nil
case TypeVarchar, TypeVarString:
// Length is encoded in 1 or 2 bytes.
if metadata > 255 {
l := int(uint64(data[pos]) |
uint64(data[pos+1])<<8)
return l + 2, nil
}
l := int(data[pos])
return l + 1, nil
case TypeBit:
// bitmap length is in metadata, as:
// upper 8 bits: bytes length
// lower 8 bits: bit length
nbits := ((metadata >> 8) * 8) + (metadata & 0xFF)
return (int(nbits) + 7) / 8, nil
case TypeTimestamp2:
// metadata has number of decimals. One byte encodes
// two decimals.
return 4 + (int(metadata)+1)/2, nil
case TypeDateTime2:
// metadata has number of decimals. One byte encodes
// two decimals.
return 5 + (int(metadata)+1)/2, nil
case TypeTime2:
// metadata has number of decimals. One byte encodes
// two decimals.
return 3 + (int(metadata)+1)/2, nil
case TypeJSON:
// length in encoded in 'meta' bytes, but at least 2,
// and the value cannot be > 64k, so just read 2 bytes.
// (meta also should have '2' as value).
// (this weird logic is what event printing does).
l := int(uint64(data[pos]) |
uint64(data[pos+1])<<8)
return l + int(metadata), nil
case TypeNewDecimal:
precision := int(metadata >> 8)
scale := int(metadata & 0xff)
// Example:
// NNNNNNNNNNNN.MMMMMM
// 12 bytes 6 bytes
// precision is 18
// scale is 6
// storage is done by groups of 9 digits:
// - 32 bits are used to store groups of 9 digits.
// - any leftover digit is stored in:
// - 1 byte for 1 and 2 digits
// - 2 bytes for 3 and 4 digits
// - 3 bytes for 5 and 6 digits
// - 4 bytes for 7 and 8 digits (would also work for 9)
// both sides of the dot are stored separately.
// In this example, we'd have:
// - 2 bytes to store the first 3 full digits.
// - 4 bytes to store the next 9 full digits.
// - 3 bytes to store the 6 fractional digits.
intg := precision - scale
intg0 := intg / 9
frac0 := scale / 9
intg0x := intg - intg0*9
frac0x := scale - frac0*9
return intg0*4 + dig2bytes[intg0x] + frac0*4 + dig2bytes[frac0x], nil
case TypeEnum, TypeSet:
return int(metadata & 0xff), nil
case TypeTinyBlob, TypeMediumBlob, TypeLongBlob, TypeBlob, TypeGeometry:
// of the Blobs, only TypeBlob is used in binary logs,
// but supports others just in case.
switch metadata {
case 1:
return 1 + int(uint32(data[pos])), nil
case 2:
return 2 + int(uint32(data[pos])|
uint32(data[pos+1])<<8), nil
case 3:
return 3 + int(uint32(data[pos])|
uint32(data[pos+1])<<8|
uint32(data[pos+2])<<16), nil
case 4:
return 4 + int(uint32(data[pos])|
uint32(data[pos+1])<<8|
uint32(data[pos+2])<<16|
uint32(data[pos+3])<<24), nil
default:
return 0, fmt.Errorf("unsupported blob/geometry metadata value %v (data: %v pos: %v)", metadata, data, pos)
}
case TypeString:
// This may do String, Enum, and Set. The type is in
// metadata. If it's a string, then there will be more bits.
// This will give us the maximum length of the field.
t := metadata >> 8
if t == TypeEnum || t == TypeSet {
return int(metadata & 0xff), nil
}
max := int((((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0xff))
// Length is encoded in 1 or 2 bytes.
if max > 255 {
l := int(uint64(data[pos]) |
uint64(data[pos+1])<<8)
return l + 2, nil
}
l := int(data[pos])
return l + 1, nil
default:
return 0, fmt.Errorf("unsupported type %v (data: %v pos: %v)", typ, data, pos)
}
}
// printTimestamp is a helper method to append a timestamp into a bytes.Buffer,
// and return the Buffer.
func printTimestamp(v uint32) *bytes.Buffer {
if v == 0 {
return bytes.NewBuffer(ZeroTimestamp)
}
t := time.Unix(int64(v), 0).UTC()
year, month, day := t.Date()
hour, minute, second := t.Clock()
result := &bytes.Buffer{}
fmt.Fprintf(result, "%04d-%02d-%02d %02d:%02d:%02d", year, int(month), day, hour, minute, second)
return result
}
// CellValue returns the data for a cell as a sqltypes.Value, and how
// many bytes it takes. It only uses the querypb.Type value for the
// signed flag.
func CellValue(data []byte, pos int, typ byte, metadata uint16, styp querypb.Type) (sqltypes.Value, int, error) {
switch typ {
case TypeTiny:
if sqltypes.IsSigned(styp) {
return sqltypes.MakeTrusted(querypb.Type_INT8,
strconv.AppendInt(nil, int64(int8(data[pos])), 10)), 1, nil
}
return sqltypes.MakeTrusted(querypb.Type_UINT8,
strconv.AppendUint(nil, uint64(data[pos]), 10)), 1, nil
case TypeYear:
val := data[pos]
if val == 0 {
return sqltypes.MakeTrusted(querypb.Type_YEAR,
[]byte{'0', '0', '0', '0'}), 1, nil
}
return sqltypes.MakeTrusted(querypb.Type_YEAR,
strconv.AppendUint(nil, uint64(data[pos])+1900, 10)), 1, nil
case TypeShort:
val := binary.LittleEndian.Uint16(data[pos : pos+2])
if sqltypes.IsSigned(styp) {
return sqltypes.MakeTrusted(querypb.Type_INT16,
strconv.AppendInt(nil, int64(int16(val)), 10)), 2, nil
}
return sqltypes.MakeTrusted(querypb.Type_UINT16,
strconv.AppendUint(nil, uint64(val), 10)), 2, nil
case TypeInt24:
if sqltypes.IsSigned(styp) && data[pos+2]&128 > 0 {
// Negative number, have to extend the sign.
val := int32(uint32(data[pos]) +
uint32(data[pos+1])<<8 +
uint32(data[pos+2])<<16 +
uint32(255)<<24)
return sqltypes.MakeTrusted(querypb.Type_INT24,
strconv.AppendInt(nil, int64(val), 10)), 3, nil
}
// Positive number.
val := uint64(data[pos]) +
uint64(data[pos+1])<<8 +
uint64(data[pos+2])<<16
return sqltypes.MakeTrusted(querypb.Type_UINT24,
strconv.AppendUint(nil, val, 10)), 3, nil
case TypeLong:
val := binary.LittleEndian.Uint32(data[pos : pos+4])
if sqltypes.IsSigned(styp) {
return sqltypes.MakeTrusted(querypb.Type_INT32,
strconv.AppendInt(nil, int64(int32(val)), 10)), 4, nil
}
return sqltypes.MakeTrusted(querypb.Type_UINT32,
strconv.AppendUint(nil, uint64(val), 10)), 4, nil
case TypeFloat:
val := binary.LittleEndian.Uint32(data[pos : pos+4])
fval := math.Float32frombits(val)
return sqltypes.MakeTrusted(querypb.Type_FLOAT32,
strconv.AppendFloat(nil, float64(fval), 'E', -1, 32)), 4, nil
case TypeDouble:
val := binary.LittleEndian.Uint64(data[pos : pos+8])
fval := math.Float64frombits(val)
return sqltypes.MakeTrusted(querypb.Type_FLOAT64,
strconv.AppendFloat(nil, fval, 'E', -1, 64)), 8, nil
case TypeTimestamp:
val := binary.LittleEndian.Uint32(data[pos : pos+4])
txt := printTimestamp(val)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 4, nil
case TypeLongLong:
val := binary.LittleEndian.Uint64(data[pos : pos+8])
if sqltypes.IsSigned(styp) {
return sqltypes.MakeTrusted(querypb.Type_INT64,
strconv.AppendInt(nil, int64(val), 10)), 8, nil
}
return sqltypes.MakeTrusted(querypb.Type_UINT64,
strconv.AppendUint(nil, val, 10)), 8, nil
case TypeDate, TypeNewDate:
val := uint32(data[pos]) +
uint32(data[pos+1])<<8 +
uint32(data[pos+2])<<16
day := val & 31
month := val >> 5 & 15
year := val >> 9
return sqltypes.MakeTrusted(querypb.Type_DATE,
[]byte(fmt.Sprintf("%04d-%02d-%02d", year, month, day))), 3, nil
case TypeTime:
var hour, minute, second int32
if data[pos+2]&128 > 0 {
// Negative number, have to extend the sign.
val := int32(uint32(data[pos]) +
uint32(data[pos+1])<<8 +
uint32(data[pos+2])<<16 +
uint32(255)<<24)
hour = val / 10000
minute = -((val % 10000) / 100)
second = -(val % 100)
} else {
val := int32(data[pos]) +
int32(data[pos+1])<<8 +
int32(data[pos+2])<<16
hour = val / 10000
minute = (val % 10000) / 100
second = val % 100
}
return sqltypes.MakeTrusted(querypb.Type_TIME,
[]byte(fmt.Sprintf("%02d:%02d:%02d", hour, minute, second))), 3, nil
case TypeDateTime:
val := binary.LittleEndian.Uint64(data[pos : pos+8])
d := val / 1000000
t := val % 1000000
year := d / 10000
month := (d % 10000) / 100
day := d % 100
hour := t / 10000
minute := (t % 10000) / 100
second := t % 100
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
[]byte(fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second))), 8, nil
case TypeVarchar, TypeVarString:
// Length is encoded in 1 or 2 bytes.
if metadata > 255 {
l := int(uint64(data[pos]) |
uint64(data[pos+1])<<8)
return sqltypes.MakeTrusted(querypb.Type_VARCHAR,
data[pos+2:pos+2+l]), l + 2, nil
}
l := int(data[pos])
return sqltypes.MakeTrusted(querypb.Type_VARCHAR,
data[pos+1:pos+1+l]), l + 1, nil
case TypeBit:
// The contents is just the bytes, quoted.
nbits := ((metadata >> 8) * 8) + (metadata & 0xFF)
l := (int(nbits) + 7) / 8
return sqltypes.MakeTrusted(querypb.Type_BIT,
data[pos:pos+l]), l, nil
case TypeTimestamp2:
second := binary.BigEndian.Uint32(data[pos : pos+4])
txt := printTimestamp(second)
switch metadata {
case 1:
decimals := int(data[pos+4])
fmt.Fprintf(txt, ".%01d", decimals/10)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 5, nil
case 2:
decimals := int(data[pos+4])
fmt.Fprintf(txt, ".%02d", decimals)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 5, nil
case 3:
decimals := int(data[pos+4])<<8 +
int(data[pos+5])
fmt.Fprintf(txt, ".%03d", decimals/10)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 6, nil
case 4:
decimals := int(data[pos+4])<<8 +
int(data[pos+5])
fmt.Fprintf(txt, ".%04d", decimals)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 6, nil
case 5:
decimals := int(data[pos+4])<<16 +
int(data[pos+5])<<8 +
int(data[pos+6])
fmt.Fprintf(txt, ".%05d", decimals/10)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 7, nil
case 6:
decimals := int(data[pos+4])<<16 +
int(data[pos+5])<<8 +
int(data[pos+6])
fmt.Fprintf(txt, ".%06d", decimals)
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 7, nil
}
return sqltypes.MakeTrusted(querypb.Type_TIMESTAMP,
txt.Bytes()), 4, nil
case TypeDateTime2:
ymdhms := (uint64(data[pos])<<32 |
uint64(data[pos+1])<<24 |
uint64(data[pos+2])<<16 |
uint64(data[pos+3])<<8 |
uint64(data[pos+4])) - uint64(0x8000000000)
ymd := ymdhms >> 17
ym := ymd >> 5
hms := ymdhms % (1 << 17)
day := ymd % (1 << 5)
month := ym % 13
year := ym / 13
second := hms % (1 << 6)
minute := (hms >> 6) % (1 << 6)
hour := hms >> 12
txt := &bytes.Buffer{}
fmt.Fprintf(txt, "%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second)
switch metadata {
case 1:
decimals := int(data[pos+5])
fmt.Fprintf(txt, ".%01d", decimals/10)
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 6, nil
case 2:
decimals := int(data[pos+5])
fmt.Fprintf(txt, ".%02d", decimals)
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 6, nil
case 3:
decimals := int(data[pos+5])<<8 +
int(data[pos+6])
fmt.Fprintf(txt, ".%03d", decimals/10)
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 7, nil
case 4:
decimals := int(data[pos+5])<<8 +
int(data[pos+6])
fmt.Fprintf(txt, ".%04d", decimals)
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 7, nil
case 5:
decimals := int(data[pos+5])<<16 +
int(data[pos+6])<<8 +
int(data[pos+7])
fmt.Fprintf(txt, ".%05d", decimals/10)
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 8, nil
case 6:
decimals := int(data[pos+5])<<16 +
int(data[pos+6])<<8 +
int(data[pos+7])
fmt.Fprintf(txt, ".%06d", decimals)
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 8, nil
}
return sqltypes.MakeTrusted(querypb.Type_DATETIME,
txt.Bytes()), 5, nil
case TypeTime2:
hms := (int64(data[pos])<<16 |
int64(data[pos+1])<<8 |
int64(data[pos+2])) - 0x800000
sign := ""
if hms < 0 {
hms = -hms
sign = "-"
}
fracStr := ""
switch metadata {
case 1:
frac := int(data[pos+3])
if sign == "-" && frac != 0 {
hms--
frac = 0x100 - frac
}
fracStr = fmt.Sprintf(".%.1d", frac/10)
case 2:
frac := int(data[pos+3])
if sign == "-" && frac != 0 {
hms--
frac = 0x100 - frac
}
fracStr = fmt.Sprintf(".%.2d", frac)
case 3:
frac := int(data[pos+3])<<8 |
int(data[pos+4])
if sign == "-" && frac != 0 {
hms--
frac = 0x10000 - frac
}
fracStr = fmt.Sprintf(".%.3d", frac/10)
case 4:
frac := int(data[pos+3])<<8 |
int(data[pos+4])
if sign == "-" && frac != 0 {
hms--
frac = 0x10000 - frac
}
fracStr = fmt.Sprintf(".%.4d", frac)
case 5:
frac := int(data[pos+3])<<16 |
int(data[pos+4])<<8 |
int(data[pos+5])
if sign == "-" && frac != 0 {
hms--
frac = 0x1000000 - frac
}
fracStr = fmt.Sprintf(".%.5d", frac/10)
case 6:
frac := int(data[pos+3])<<16 |
int(data[pos+4])<<8 |
int(data[pos+5])
if sign == "-" && frac != 0 {
hms--
frac = 0x1000000 - frac
}
fracStr = fmt.Sprintf(".%.6d", frac)
}
hour := (hms >> 12) % (1 << 10)
minute := (hms >> 6) % (1 << 6)
second := hms % (1 << 6)
return sqltypes.MakeTrusted(querypb.Type_TIME,
[]byte(fmt.Sprintf("%v%02d:%02d:%02d%v", sign, hour, minute, second, fracStr))), 3 + (int(metadata)+1)/2, nil
case TypeJSON:
l := int(uint64(data[pos]) |
uint64(data[pos+1])<<8)
// length in encoded in 'meta' bytes, but at least 2,
// and the value cannot be > 64k, so just read 2 bytes.
// (meta also should have '2' as value).
// (this weird logic is what event printing does).
// TODO(alainjobart) the binary data for JSON should
// be parsed, and re-printed as JSON. This is a large
// project, as the binary version of the data is
// somewhat complex. For now, just return NULL.
return sqltypes.NULL, l + int(metadata), nil
case TypeNewDecimal:
precision := int(metadata >> 8) // total digits number
scale := int(metadata & 0xff) // number of fractional digits
intg := precision - scale // number of full digits
intg0 := intg / 9 // number of 32-bits digits
intg0x := intg - intg0*9 // leftover full digits
frac0 := scale / 9 // number of 32 bits fractionals
frac0x := scale - frac0*9 // leftover fractionals
l := intg0*4 + dig2bytes[intg0x] + frac0*4 + dig2bytes[frac0x]
// Copy the data so we can change it. Otherwise
// decoding is just too hard.
d := make([]byte, l)
copy(d, data[pos:pos+l])
txt := &bytes.Buffer{}
isNegative := (d[0] & 0x80) == 0
d[0] ^= 0x80 // First bit is inverted.
if isNegative {
// Negative numbers are just inverted bytes.
txt.WriteByte('-')
for i := range d {
d[i] ^= 0xff
}
}
// first we have the leftover full digits
var val uint32
switch dig2bytes[intg0x] {
case 0:
// nothing to do
case 1:
// one byte, up to two digits
val = uint32(d[0])
case 2:
// two bytes, up to 4 digits
val = uint32(d[0])<<8 +
uint32(d[1])
case 3:
// 3 bytes, up to 6 digits
val = uint32(d[0])<<16 +
uint32(d[1])<<8 +
uint32(d[2])
case 4:
// 4 bytes, up to 8 digits (9 digits would be a full)
val = uint32(d[0])<<24 +
uint32(d[1])<<16 +
uint32(d[2])<<8 +
uint32(d[3])
}
pos = dig2bytes[intg0x]
if val > 0 {
txt.Write(strconv.AppendUint(nil, uint64(val), 10))
}
// now the full digits, 32 bits each, 9 digits
for i := 0; i < intg0; i++ {
val = binary.BigEndian.Uint32(d[pos : pos+4])
fmt.Fprintf(txt, "%9d", val)
pos += 4
}
// now see if we have a fraction
if scale == 0 {
return sqltypes.MakeTrusted(querypb.Type_DECIMAL,
txt.Bytes()), l, nil
}
txt.WriteByte('.')
// now the full fractional digits
for i := 0; i < frac0; i++ {
val = binary.BigEndian.Uint32(d[pos : pos+4])
fmt.Fprintf(txt, "%9d", val)
pos += 4
}
// then the partial fractional digits
switch dig2bytes[frac0x] {
case 0:
// Nothing to do
return sqltypes.MakeTrusted(querypb.Type_DECIMAL,
txt.Bytes()), l, nil
case 1:
// one byte, 1 or 2 digits
val = uint32(d[pos])
if frac0x == 1 {
fmt.Fprintf(txt, "%1d", val)
} else {
fmt.Fprintf(txt, "%2d", val)
}
case 2:
// two bytes, 3 or 4 digits
val = uint32(d[pos])<<8 +
uint32(d[pos+1])
if frac0x == 3 {
fmt.Fprintf(txt, "%3d", val)
} else {
fmt.Fprintf(txt, "%4d", val)
}
case 3:
// 3 bytes, 5 or 6 digits
val = uint32(d[pos])<<16 +
uint32(d[pos+1])<<8 +
uint32(d[pos+2])
if frac0x == 5 {
fmt.Fprintf(txt, "%5d", val)
} else {
fmt.Fprintf(txt, "%6d", val)
}
case 4:
// 4 bytes, 7 or 8 digits (9 digits would be a full)
val = uint32(d[pos])<<24 +
uint32(d[pos+1])<<16 +
uint32(d[pos+2])<<8 +
uint32(d[pos+3])
if frac0x == 7 {
fmt.Fprintf(txt, "%7d", val)
} else {
fmt.Fprintf(txt, "%8d", val)
}
}
return sqltypes.MakeTrusted(querypb.Type_DECIMAL,
txt.Bytes()), l, nil
case TypeEnum:
switch metadata & 0xff {
case 1:
// One byte storage.
return sqltypes.MakeTrusted(querypb.Type_ENUM,
strconv.AppendUint(nil, uint64(data[pos]), 10)), 1, nil
case 2:
// Two bytes storage.
val := binary.LittleEndian.Uint16(data[pos : pos+2])
return sqltypes.MakeTrusted(querypb.Type_ENUM,
strconv.AppendUint(nil, uint64(val), 10)), 2, nil
default:
return sqltypes.NULL, 0, fmt.Errorf("unexpected enum size: %v", metadata&0xff)
}
case TypeSet:
l := int(metadata & 0xff)
return sqltypes.MakeTrusted(querypb.Type_SET,
data[pos:pos+l]), l, nil
case TypeTinyBlob, TypeMediumBlob, TypeLongBlob, TypeBlob:
// Only TypeBlob is used in binary logs,
// but supports others just in case.
l := 0
switch metadata {
case 1:
l = int(uint32(data[pos]))
case 2:
l = int(uint32(data[pos]) |
uint32(data[pos+1])<<8)
case 3:
l = int(uint32(data[pos]) |
uint32(data[pos+1])<<8 |
uint32(data[pos+2])<<16)
case 4:
l = int(uint32(data[pos]) |
uint32(data[pos+1])<<8 |
uint32(data[pos+2])<<16 |
uint32(data[pos+3])<<24)
default:
return sqltypes.NULL, 0, fmt.Errorf("unsupported blob metadata value %v (data: %v pos: %v)", metadata, data, pos)
}
pos += int(metadata)
return sqltypes.MakeTrusted(querypb.Type_VARBINARY,
data[pos:pos+l]), l + int(metadata), nil
case TypeString:
// This may do String, Enum, and Set. The type is in
// metadata. If it's a string, then there will be more bits.
t := metadata >> 8
if t == TypeEnum {
// We don't know the string values. So just use the
// numbers.
switch metadata & 0xff {
case 1:
// One byte storage.
return sqltypes.MakeTrusted(querypb.Type_UINT8,
strconv.AppendUint(nil, uint64(data[pos]), 10)), 1, nil
case 2:
// Two bytes storage.
val := binary.LittleEndian.Uint16(data[pos : pos+2])
return sqltypes.MakeTrusted(querypb.Type_UINT16,
strconv.AppendUint(nil, uint64(val), 10)), 2, nil
default:
return sqltypes.NULL, 0, fmt.Errorf("unexpected enum size: %v", metadata&0xff)
}
}
if t == TypeSet {
// We don't know the set values. So just use the
// numbers.
l := int(metadata & 0xff)
var val uint64
for i := 0; i < l; i++ {
val += uint64(data[pos+i]) << (uint(i) * 8)
}
return sqltypes.MakeTrusted(querypb.Type_UINT64,
strconv.AppendUint(nil, uint64(val), 10)), l, nil
}
// This is a real string. The length is weird.
max := int((((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0xff))
// Length is encoded in 1 or 2 bytes.
if max > 255 {
l := int(uint64(data[pos]) |
uint64(data[pos+1])<<8)
return sqltypes.MakeTrusted(querypb.Type_VARCHAR,
data[pos+2:pos+2+l]), l + 2, nil
}
l := int(data[pos])
return sqltypes.MakeTrusted(querypb.Type_VARCHAR,
data[pos+1:pos+1+l]), l + 1, nil
case TypeGeometry:
l := 0
switch metadata {
case 1:
l = int(uint32(data[pos]))
case 2:
l = int(uint32(data[pos]) |
uint32(data[pos+1])<<8)
case 3:
l = int(uint32(data[pos]) |
uint32(data[pos+1])<<8 |
uint32(data[pos+2])<<16)
case 4:
l = int(uint32(data[pos]) |
uint32(data[pos+1])<<8 |
uint32(data[pos+2])<<16 |
uint32(data[pos+3])<<24)
default:
return sqltypes.NULL, 0, fmt.Errorf("unsupported geometry metadata value %v (data: %v pos: %v)", metadata, data, pos)
}
pos += int(metadata)
return sqltypes.MakeTrusted(querypb.Type_GEOMETRY,
data[pos:pos+l]), l + int(metadata), nil
default:
return sqltypes.NULL, 0, fmt.Errorf("unsupported type %v", typ)
}
}
// Rows implements BinlogEvent.TableMap().
//
// Expected format (L = total length of event data):
// # bytes field
// 4/6 table id
// 2 flags
// -- if version == 2
// 2 extra data length edl
// edl extra data
// -- endif
// <var> number of columns (var-len encoded)
// <var> identify bitmap
// <var> data bitmap
// -- for each row
// <var> null bitmap for identify for present rows
// <var> values for each identify field
// <var> null bitmap for data for present rows
// <var> values for each data field
// --
func (ev binlogEvent) Rows(f BinlogFormat, tm *TableMap) (Rows, error) {
typ := ev.Type()
data := ev.Bytes()[f.HeaderLength:]
hasIdentify := typ == eUpdateRowsEventV1 || typ == eUpdateRowsEventV2 ||
typ == eDeleteRowsEventV1 || typ == eDeleteRowsEventV2
hasData := typ == eWriteRowsEventV1 || typ == eWriteRowsEventV2 ||
typ == eUpdateRowsEventV1 || typ == eUpdateRowsEventV2
result := Rows{}
pos := 6
if f.HeaderSize(typ) == 6 {
pos = 4
}
result.Flags = binary.LittleEndian.Uint16(data[pos : pos+2])
pos += 2
// version=2 have extra data here.
if typ == eWriteRowsEventV2 || typ == eUpdateRowsEventV2 || typ == eDeleteRowsEventV2 {
// This extraDataLength contains the 2 bytes length.
extraDataLength := binary.LittleEndian.Uint16(data[pos : pos+2])
pos += int(extraDataLength)
}
// FIXME(alainjobart) this is var len encoded.
columnCount := int(data[pos])
pos++
numIdentifyColumns := 0
numDataColumns := 0
if hasIdentify {
// Bitmap of the columns used for identify.
result.IdentifyColumns, pos = newBitmap(data, pos, columnCount)
numIdentifyColumns = result.IdentifyColumns.BitCount()
}
if hasData {
// Bitmap of columns that are present.
result.DataColumns, pos = newBitmap(data, pos, columnCount)
numDataColumns = result.DataColumns.BitCount()
}
// One row at a time.
for pos < len(data) {
row := Row{}
if hasIdentify {
// Bitmap of identify columns that are null (amongst the ones that are present).
row.NullIdentifyColumns, pos = newBitmap(data, pos, numIdentifyColumns)
// Get the identify values.
startPos := pos
valueIndex := 0
for c := 0; c < columnCount; c++ {
if !result.IdentifyColumns.Bit(c) {
// This column is not represented.
continue
}
if row.NullIdentifyColumns.Bit(valueIndex) {
// This column is represented, but its value is NULL.
valueIndex++
continue
}
// This column is represented now. We need to skip its length.
l, err := cellLength(data, pos, tm.Types[c], tm.Metadata[c])
if err != nil {
return result, err
}
pos += l
valueIndex++
}
row.Identify = data[startPos:pos]
}
if hasData {
// Bitmap of columns that are null (amongst the ones that are present).
row.NullColumns, pos = newBitmap(data, pos, numDataColumns)
// Get the values.
startPos := pos
valueIndex := 0
for c := 0; c < columnCount; c++ {
if !result.DataColumns.Bit(c) {
// This column is not represented.
continue
}
if row.NullColumns.Bit(valueIndex) {
// This column is represented, but its value is NULL.
valueIndex++
continue