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deserilizer.go
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/
deserilizer.go
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package serde
import (
"bytes"
"fmt"
"io"
"sort"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)
type Deserializer struct{}
func NewDeserializer() *Deserializer {
return &Deserializer{}
}
func (d *Deserializer) DeserializeAttribute(data []byte) (types.AttributeValue, error) {
if len(data) == 0 {
return nil, fmt.Errorf("empty serialized data")
}
r := bytes.NewReader(data)
return d.deserialize(r)
}
func (d *Deserializer) deserializeBinary(r io.Reader) (types.AttributeValue, error) {
value, err := decodeValue(r)
if err != nil {
return nil, err
}
return &types.AttributeValueMemberB{Value: value}, nil
}
func (d *Deserializer) deserializeNumber(r io.Reader) (types.AttributeValue, error) {
value, err := decodeValue(r)
if err != nil {
return nil, err
}
return &types.AttributeValueMemberN{Value: string(value)}, nil
}
func (d *Deserializer) deserializeString(r io.Reader) (types.AttributeValue, error) {
value, err := decodeValue(r)
if err != nil {
return nil, err
}
return &types.AttributeValueMemberS{Value: string(value)}, nil
}
func (d *Deserializer) deserializeBoolean(r io.Reader) (types.AttributeValue, error) {
value, err := decodeByte(r)
if err != nil {
return nil, err
}
return &types.AttributeValueMemberBOOL{Value: value != 0}, nil
}
func (d *Deserializer) deserializeNull(r io.Reader) (types.AttributeValue, error) {
return &types.AttributeValueMemberNULL{Value: true}, nil
}
func (d *Deserializer) deserializeList(r io.Reader) (types.AttributeValue, error) {
memberCount, err := decodeLength(r)
if err != nil {
return nil, err
}
members := make([]types.AttributeValue, memberCount)
for i := 0; i < memberCount; i++ {
member, err := d.deserialize(r)
if err != nil {
return nil, err
}
members[i] = member
}
return &types.AttributeValueMemberL{Value: members}, nil
}
func (d *Deserializer) deserializeMap(r io.Reader) (types.AttributeValue, error) {
memberCount, err := decodeLength(r)
if err != nil {
return nil, err
}
members := make(map[string]types.AttributeValue, memberCount)
for i := 0; i < memberCount; i++ {
key, err := d.deserialize(r)
if err != nil {
return nil, err
}
value, err := d.deserialize(r)
if err != nil {
return nil, err
}
keyStr, ok := key.(*types.AttributeValueMemberS)
if !ok {
return nil, fmt.Errorf("malformed serialized map: found %q as map key", key)
}
members[keyStr.Value] = value
}
return &types.AttributeValueMemberM{Value: members}, nil
}
func (d *Deserializer) deserializeBinarySet(r io.Reader) (types.AttributeValue, error) {
memberCount, err := decodeLength(r)
if err != nil {
return nil, err
}
members := make([][]byte, memberCount)
for i := 0; i < memberCount; i++ {
member, err := decodeValue(r)
if err != nil {
return nil, err
}
members[i] = member
}
sort.Slice(members, func(i, j int) bool {
return bytes.Compare(members[i], members[j]) < 0
})
return &types.AttributeValueMemberBS{Value: members}, nil
}
func (d *Deserializer) deserializeNumberSet(r io.Reader) (types.AttributeValue, error) {
memberCount, err := decodeLength(r)
if err != nil {
return nil, err
}
members := make([]string, memberCount)
for i := 0; i < memberCount; i++ {
member, err := decodeValue(r)
if err != nil {
return nil, err
}
members[i] = string(member)
}
sort.Strings(members)
return &types.AttributeValueMemberNS{Value: members}, nil
}
func (d *Deserializer) deserializeStringSet(r io.Reader) (types.AttributeValue, error) {
memberCount, err := decodeLength(r)
if err != nil {
return nil, err
}
members := make([]string, memberCount)
for i := 0; i < memberCount; i++ {
member, err := decodeValue(r)
if err != nil {
return nil, err
}
members[i] = string(member)
}
sort.Strings(members)
return &types.AttributeValueMemberSS{Value: members}, nil
}
func (d *Deserializer) deserializeFunction(tag Tag) (func(io.Reader) (types.AttributeValue, error), error) {
switch tag {
case tagBinary:
return d.deserializeBinary, nil
case tagNumber:
return d.deserializeNumber, nil
case tagString:
return d.deserializeString, nil
case tagBoolean:
return d.deserializeBoolean, nil
case tagNull:
return d.deserializeNull, nil
case tagList:
return d.deserializeList, nil
case tagMap:
return d.deserializeMap, nil
case tagBinarySet:
return d.deserializeBinarySet, nil
case tagNumberSet:
return d.deserializeNumberSet, nil
case tagStringSet:
return d.deserializeStringSet, nil
default:
return nil, fmt.Errorf("invalid tag: reserved byte is not null")
}
}
func (d *Deserializer) deserialize(r io.Reader) (types.AttributeValue, error) {
tag, err := decodeTag(r)
if err != nil {
return nil, err
}
deserializeFunc, err := d.deserializeFunction(tag)
if err != nil {
return nil, err
}
return deserializeFunc(r)
}