forked from go-gorm/gorm
/
serializer.go
170 lines (146 loc) · 4.61 KB
/
serializer.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
package schema
import (
"bytes"
"context"
"database/sql"
"database/sql/driver"
"encoding/gob"
"encoding/json"
"fmt"
"reflect"
"strings"
"sync"
"time"
)
var serializerMap = sync.Map{}
// RegisterSerializer register serializer
func RegisterSerializer(name string, serializer SerializerInterface) {
serializerMap.Store(strings.ToLower(name), serializer)
}
// GetSerializer get serializer
func GetSerializer(name string) (serializer SerializerInterface, ok bool) {
v, ok := serializerMap.Load(strings.ToLower(name))
if ok {
serializer, ok = v.(SerializerInterface)
}
return serializer, ok
}
func init() {
RegisterSerializer("json", JSONSerializer{})
RegisterSerializer("unixtime", UnixSecondSerializer{})
RegisterSerializer("gob", GobSerializer{})
}
// Serializer field value serializer
type serializer struct {
Field *Field
Serializer SerializerInterface
SerializeValuer SerializerValuerInterface
Destination reflect.Value
Context context.Context
value interface{}
fieldValue interface{}
}
// Scan implements sql.Scanner interface
func (s *serializer) Scan(value interface{}) error {
s.value = value
return nil
}
// Value implements driver.Valuer interface
func (s serializer) Value() (driver.Value, error) {
return s.SerializeValuer.Value(s.Context, s.Field, s.Destination, s.fieldValue)
}
// SerializerInterface serializer interface
type SerializerInterface interface {
Scan(ctx context.Context, field *Field, dst reflect.Value, dbValue interface{}) error
SerializerValuerInterface
}
// SerializerValuerInterface serializer valuer interface
type SerializerValuerInterface interface {
Value(ctx context.Context, field *Field, dst reflect.Value, fieldValue interface{}) (interface{}, error)
}
// JSONSerializer json serializer
type JSONSerializer struct{}
// Scan implements serializer interface
func (JSONSerializer) Scan(ctx context.Context, field *Field, dst reflect.Value, dbValue interface{}) (err error) {
fieldValue := reflect.New(field.FieldType)
if dbValue != nil {
var bytes []byte
switch v := dbValue.(type) {
case []byte:
bytes = v
case string:
bytes = []byte(v)
default:
return fmt.Errorf("failed to unmarshal JSONB value: %#v", dbValue)
}
if len(bytes) > 0 {
err = json.Unmarshal(bytes, fieldValue.Interface())
}
}
field.ReflectValueOf(ctx, dst).Set(fieldValue.Elem())
return
}
// Value implements serializer interface
func (JSONSerializer) Value(ctx context.Context, field *Field, dst reflect.Value, fieldValue interface{}) (interface{}, error) {
result, err := json.Marshal(fieldValue)
if string(result) == "null" {
if field.TagSettings["NOT NULL"] != "" {
return "", nil
}
return nil, err
}
return string(result), err
}
// UnixSecondSerializer json serializer
type UnixSecondSerializer struct{}
// Scan implements serializer interface
func (UnixSecondSerializer) Scan(ctx context.Context, field *Field, dst reflect.Value, dbValue interface{}) (err error) {
t := sql.NullTime{}
if err = t.Scan(dbValue); err == nil && t.Valid {
err = field.Set(ctx, dst, t.Time.Unix())
}
return
}
// Value implements serializer interface
func (UnixSecondSerializer) Value(ctx context.Context, field *Field, dst reflect.Value, fieldValue interface{}) (result interface{}, err error) {
rv := reflect.ValueOf(fieldValue)
switch v := fieldValue.(type) {
case int64, int, uint, uint64, int32, uint32, int16, uint16:
result = time.Unix(reflect.Indirect(rv).Int(), 0)
case *int64, *int, *uint, *uint64, *int32, *uint32, *int16, *uint16:
if rv.IsZero() {
return nil, nil
}
result = time.Unix(reflect.Indirect(rv).Int(), 0)
default:
err = fmt.Errorf("invalid field type %#v for UnixSecondSerializer, only int, uint supported", v)
}
return
}
// GobSerializer gob serializer
type GobSerializer struct{}
// Scan implements serializer interface
func (GobSerializer) Scan(ctx context.Context, field *Field, dst reflect.Value, dbValue interface{}) (err error) {
fieldValue := reflect.New(field.FieldType)
if dbValue != nil {
var bytesValue []byte
switch v := dbValue.(type) {
case []byte:
bytesValue = v
default:
return fmt.Errorf("failed to unmarshal gob value: %#v", dbValue)
}
if len(bytesValue) > 0 {
decoder := gob.NewDecoder(bytes.NewBuffer(bytesValue))
err = decoder.Decode(fieldValue.Interface())
}
}
field.ReflectValueOf(ctx, dst).Set(fieldValue.Elem())
return
}
// Value implements serializer interface
func (GobSerializer) Value(ctx context.Context, field *Field, dst reflect.Value, fieldValue interface{}) (interface{}, error) {
buf := new(bytes.Buffer)
err := gob.NewEncoder(buf).Encode(fieldValue)
return buf.Bytes(), err
}