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|
package nodb
import (
"encoding/binary"
"errors"
"fmt"
"strconv"
)
var (
errBinLogDeleteType = errors.New("invalid bin log delete type")
errBinLogPutType = errors.New("invalid bin log put type")
errBinLogCommandType = errors.New("invalid bin log command type")
)
func encodeBinLogDelete(key []byte) []byte {
buf := make([]byte, 1+len(key))
buf[0] = BinLogTypeDeletion
copy(buf[1:], key)
return buf
}
func decodeBinLogDelete(sz []byte) ([]byte, error) {
if len(sz) < 1 || sz[0] != BinLogTypeDeletion {
return nil, errBinLogDeleteType
}
return sz[1:], nil
}
func encodeBinLogPut(key []byte, value []byte) []byte {
buf := make([]byte, 3+len(key)+len(value))
buf[0] = BinLogTypePut
pos := 1
binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
pos += 2
copy(buf[pos:], key)
pos += len(key)
copy(buf[pos:], value)
return buf
}
func decodeBinLogPut(sz []byte) ([]byte, []byte, error) {
if len(sz) < 3 || sz[0] != BinLogTypePut {
return nil, nil, errBinLogPutType
}
keyLen := int(binary.BigEndian.Uint16(sz[1:]))
if 3+keyLen > len(sz) {
return nil, nil, errBinLogPutType
}
return sz[3 : 3+keyLen], sz[3+keyLen:], nil
}
func FormatBinLogEvent(event []byte) (string, error) {
logType := uint8(event[0])
var err error
var k []byte
var v []byte
var buf []byte = make([]byte, 0, 1024)
switch logType {
case BinLogTypePut:
k, v, err = decodeBinLogPut(event)
buf = append(buf, "PUT "...)
case BinLogTypeDeletion:
k, err = decodeBinLogDelete(event)
buf = append(buf, "DELETE "...)
default:
err = errInvalidBinLogEvent
}
if err != nil {
return "", err
}
if buf, err = formatDataKey(buf, k); err != nil {
return "", err
}
if v != nil && len(v) != 0 {
buf = append(buf, fmt.Sprintf(" %q", v)...)
}
return String(buf), nil
}
func formatDataKey(buf []byte, k []byte) ([]byte, error) {
if len(k) < 2 {
return nil, errInvalidBinLogEvent
}
buf = append(buf, fmt.Sprintf("DB:%2d ", k[0])...)
buf = append(buf, fmt.Sprintf("%s ", TypeName[k[1]])...)
db := new(DB)
db.index = k[0]
//to do format at respective place
switch k[1] {
case KVType:
if key, err := db.decodeKVKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
}
case HashType:
if key, field, err := db.hDecodeHashKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendQuote(buf, String(field))
}
case HSizeType:
if key, err := db.hDecodeSizeKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
}
case ListType:
if key, seq, err := db.lDecodeListKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendInt(buf, int64(seq), 10)
}
case LMetaType:
if key, err := db.lDecodeMetaKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
}
case ZSetType:
if key, m, err := db.zDecodeSetKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendQuote(buf, String(m))
}
case ZSizeType:
if key, err := db.zDecodeSizeKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
}
case ZScoreType:
if key, m, score, err := db.zDecodeScoreKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendQuote(buf, String(m))
buf = append(buf, ' ')
buf = strconv.AppendInt(buf, score, 10)
}
case BitType:
if key, seq, err := db.bDecodeBinKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendUint(buf, uint64(seq), 10)
}
case BitMetaType:
if key, err := db.bDecodeMetaKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
}
case SetType:
if key, member, err := db.sDecodeSetKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendQuote(buf, String(member))
}
case SSizeType:
if key, err := db.sDecodeSizeKey(k); err != nil {
return nil, err
} else {
buf = strconv.AppendQuote(buf, String(key))
}
case ExpTimeType:
if tp, key, t, err := db.expDecodeTimeKey(k); err != nil {
return nil, err
} else {
buf = append(buf, TypeName[tp]...)
buf = append(buf, ' ')
buf = strconv.AppendQuote(buf, String(key))
buf = append(buf, ' ')
buf = strconv.AppendInt(buf, t, 10)
}
case ExpMetaType:
if tp, key, err := db.expDecodeMetaKey(k); err != nil {
return nil, err
} else {
buf = append(buf, TypeName[tp]...)
buf = append(buf, ' ')
buf = strconv.AppendQuote(buf, String(key))
}
default:
return nil, errInvalidBinLogEvent
}
return buf, nil
}
|
