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decode.go
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decode.go
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package rdb
// Copyright 2014 Wandoujia Inc. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
import (
"bytes"
"fmt"
"strconv"
"github.com/cupcake/rdb"
"github.com/cupcake/rdb/nopdecoder"
"github.com/weedge/pkg/rdb/structure"
"github.com/weedge/pkg/rdb/types"
"github.com/weedge/pkg/utils"
)
func DecodeDump(p []byte) (interface{}, error) {
rd := bytes.NewReader(p)
typeByte := structure.ReadByte(rd)
//key := structure.ReadString(rd)
o := types.ParseObject(rd, typeByte, "")
switch item := o.(type) {
case *types.StringObject:
return String(item.Value), nil
case *types.HashObject:
data := make(Hash, len(item.Value))
i := 0
for f, v := range item.Value {
data[i].Field = utils.String2Bytes(f)
data[i].Value = utils.String2Bytes(v)
i++
}
return data, nil
case *types.ListObject:
data := make(List, len(item.Elements))
for i := range item.Elements {
data[i] = utils.String2Bytes(item.Elements[i])
data[i] = utils.String2Bytes(item.Elements[i])
}
return data, nil
case *types.SetObject:
data := make(Set, len(item.Elements))
for i := range item.Elements {
data[i] = utils.String2Bytes(item.Elements[i])
data[i] = utils.String2Bytes(item.Elements[i])
}
return data, nil
case *types.ZsetObject:
data := make(ZSet, len(item.Elements))
for i := range item.Elements {
data[i].Member = utils.String2Bytes(item.Elements[i].Member)
if s, err := strconv.ParseFloat(item.Elements[i].Score, 64); err == nil {
return nil, err
} else {
data[i].Score = s
}
}
return data, nil
}
return nil, nil
}
func decodeDump(p []byte) (interface{}, error) {
d := &decoder{}
if err := rdb.DecodeDump(p, 0, nil, 0, d); err != nil {
return nil, err
}
return d.obj, d.err
}
type decoder struct {
nopdecoder.NopDecoder
obj interface{}
err error
}
func (d *decoder) initObject(obj interface{}) {
if d.err != nil {
return
}
if d.obj != nil {
d.err = fmt.Errorf("invalid object, init again")
} else {
d.obj = obj
}
}
func (d *decoder) Set(key, value []byte, expiry int64) {
d.initObject(String(value))
}
func (d *decoder) StartHash(key []byte, length, expiry int64) {
d.initObject(Hash(nil))
}
func (d *decoder) Hset(key, field, value []byte) {
if d.err != nil {
return
}
switch h := d.obj.(type) {
default:
d.err = fmt.Errorf("invalid object, not a hashmap")
case Hash:
v := struct {
Field, Value []byte
}{
field,
value,
}
d.obj = append(h, v)
}
}
func (d *decoder) StartSet(key []byte, cardinality, expiry int64) {
d.initObject(Set(nil))
}
func (d *decoder) Sadd(key, member []byte) {
if d.err != nil {
return
}
switch s := d.obj.(type) {
default:
d.err = fmt.Errorf("invalid object, not a set")
case Set:
d.obj = append(s, member)
}
}
func (d *decoder) StartList(key []byte, length, expiry int64) {
d.initObject(List(nil))
}
func (d *decoder) Rpush(key, value []byte) {
if d.err != nil {
return
}
switch l := d.obj.(type) {
default:
d.err = fmt.Errorf("invalid object, not a list")
case List:
d.obj = append(l, value)
}
}
func (d *decoder) StartZSet(key []byte, cardinality, expiry int64) {
d.initObject(ZSet(nil))
}
func (d *decoder) Zadd(key []byte, score float64, member []byte) {
if d.err != nil {
return
}
switch z := d.obj.(type) {
default:
d.err = fmt.Errorf("invalid object, not a zset")
case ZSet:
v := struct {
Member []byte
Score float64
}{
member,
score,
}
d.obj = append(z, v)
}
}