forked from dolthub/go-mysql-server
-
Notifications
You must be signed in to change notification settings - Fork 0
/
json.go
192 lines (167 loc) · 4.85 KB
/
json.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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
// Copyright 2022 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"encoding/json"
"reflect"
"github.com/dolthub/vitess/go/sqltypes"
"github.com/dolthub/vitess/go/vt/proto/query"
"github.com/dolthub/go-mysql-server/sql"
)
var (
jsonValueType = reflect.TypeOf((*JSONValue)(nil)).Elem()
MaxJsonFieldByteLength = int64(1024) * int64(1024) * int64(1024)
)
var JSON sql.Type = JsonType{}
type JsonType struct{}
// Compare implements Type interface.
func (t JsonType) Compare(a interface{}, b interface{}) (int, error) {
if hasNulls, res := CompareNulls(a, b); hasNulls {
return res, nil
}
var err error
if a, err = t.Convert(a); err != nil {
return 0, err
}
if b, err = t.Convert(b); err != nil {
return 0, err
}
// todo: making a context here is expensive
return a.(JSONValue).Compare(sql.NewEmptyContext(), b.(JSONValue))
}
// Convert implements Type interface.
func (t JsonType) Convert(v interface{}) (doc interface{}, err error) {
switch v := v.(type) {
case JSONValue:
return v, nil
case []byte:
if int64(len(v)) > MaxJsonFieldByteLength {
return nil, ErrLengthTooLarge.New(len(v), MaxJsonFieldByteLength)
}
err = json.Unmarshal(v, &doc)
if err != nil {
return nil, sql.ErrInvalidJson.New(err.Error())
}
case string:
charsetMaxLength := sql.Collation_Default.CharacterSet().MaxLength()
length := int64(len(v)) * charsetMaxLength
if length > MaxJsonFieldByteLength {
return nil, ErrLengthTooLarge.New(length, MaxJsonFieldByteLength)
}
err = json.Unmarshal([]byte(v), &doc)
if err != nil {
return nil, sql.ErrInvalidJson.New(err.Error())
}
default:
// if |v| can be marshalled, it contains
// a valid JSON document representation
if b, berr := json.Marshal(v); berr == nil {
if int64(len(b)) > MaxJsonFieldByteLength {
return nil, ErrLengthTooLarge.New(len(b), MaxJsonFieldByteLength)
}
err = json.Unmarshal(b, &doc)
if err != nil {
return nil, sql.ErrInvalidJson.New(err.Error())
}
}
}
if err != nil {
return nil, err
}
return JSONDocument{Val: doc}, nil
}
// Equals implements the Type interface.
func (t JsonType) Equals(otherType sql.Type) bool {
_, ok := otherType.(JsonType)
return ok
}
// MaxTextResponseByteLength implements the Type interface
func (t JsonType) MaxTextResponseByteLength() uint32 {
return uint32(MaxJsonFieldByteLength*sql.Collation_Default.CharacterSet().MaxLength()) - 1
}
// Promote implements the Type interface.
func (t JsonType) Promote() sql.Type {
return t
}
// SQL implements Type interface.
func (t JsonType) SQL(ctx *sql.Context, dest []byte, v interface{}) (sqltypes.Value, error) {
if v == nil {
return sqltypes.NULL, nil
}
// Convert to jsonType
jsVal, err := t.Convert(v)
if err != nil {
return sqltypes.NULL, err
}
js := jsVal.(JSONValue)
s, err := js.ToString(ctx)
if err != nil {
return sqltypes.NULL, err
}
val := AppendAndSliceString(dest, s)
return sqltypes.MakeTrusted(sqltypes.TypeJSON, val), nil
}
// String implements Type interface.
func (t JsonType) String() string {
return "json"
}
// Type implements Type interface.
func (t JsonType) Type() query.Type {
return sqltypes.TypeJSON
}
// ValueType implements Type interface.
func (t JsonType) ValueType() reflect.Type {
return jsonValueType
}
// Zero implements Type interface.
func (t JsonType) Zero() interface{} {
// MySQL throws an error for INSERT IGNORE, UPDATE IGNORE, etc. when bad json is encountered:
// ERROR 3140 (22032): Invalid JSON text: "Invalid value." at position 0 in value for column 'table.column'.
return nil
}
// DeepCopyJson implements deep copy of JSON document
func DeepCopyJson(v interface{}) interface{} {
if v == nil {
return nil
}
switch v.(type) {
case map[string]interface{}:
m := v.(map[string]interface{})
newMap := make(map[string]interface{})
for k, value := range m {
newMap[k] = DeepCopyJson(value)
}
return newMap
case []interface{}:
arr := v.([]interface{})
newArray := make([]interface{}, len(arr))
for i, doc := range arr {
newArray[i] = DeepCopyJson(doc)
}
return newArray
case bool, string, float64, float32,
int, int8, int16, int32, int64,
uint, uint8, uint16, uint32, uint64:
return v
default:
return nil
}
}
func MustJSON(s string) JSONDocument {
var doc interface{}
if err := json.Unmarshal([]byte(s), &doc); err != nil {
panic(err)
}
return JSONDocument{Val: doc}
}