-
Notifications
You must be signed in to change notification settings - Fork 4.7k
/
access.go
294 lines (237 loc) · 6.86 KB
/
access.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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/*
Copyright 2020 The Kubernetes Authors.
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 reflectutils
import (
"fmt"
"reflect"
"strconv"
"strings"
"time"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/kops/pkg/apis/kops"
)
func SetString(target interface{}, targetPath string, newValue string) error {
targetValue := reflect.ValueOf(target)
targetFieldPath, err := ParseFieldPath(targetPath)
if err != nil {
return fmt.Errorf("cannot parse field path %q: %w", targetPath, err)
}
fieldSet := false
visitor := func(path *FieldPath, field *reflect.StructField, v reflect.Value) error {
if !targetFieldPath.HasPrefixMatch(path) {
return nil
}
if targetFieldPath.Matches(path) {
if !v.CanSet() {
return fmt.Errorf("cannot set field %q (marked immutable)", path)
}
if err := setType(v, newValue); err != nil {
return fmt.Errorf("cannot set field %q: %v", path, err)
}
fieldSet = true
return nil
}
// Partial match, check for nil struct and auto-populate
if v.Kind() == reflect.Ptr && v.IsNil() {
if !v.CanSet() {
return fmt.Errorf("cannot set field %q (marked immutable)", path)
}
t := v.Type().String()
var newV reflect.Value
switch v.Type().Elem().Kind() {
case reflect.Struct:
newV = reflect.New(v.Type().Elem())
default:
return fmt.Errorf("unhandled type %v %q", v.Type().Elem().Kind(), t)
}
v.Set(newV)
return nil
}
return nil
}
err = ReflectRecursive(targetValue, visitor, &ReflectOptions{JSONNames: true})
if err != nil {
return err
}
if !fieldSet {
return fmt.Errorf("field %s not found in %s", targetPath, BuildTypeName(reflect.TypeOf(target)))
}
return nil
}
func setType(v reflect.Value, newValue string) error {
if !v.CanSet() {
return fmt.Errorf("cannot set value")
}
if v.Type().Kind() == reflect.Slice {
// To support multiple values, we split on commas.
// We have no way to escape a comma currently; but in general we prefer having a slice in the schema,
// rather than having values that need to be parsed, so we may not need it.
tokens := strings.Split(newValue, ",")
valueArray := reflect.MakeSlice(v.Type(), 0, v.Len()+len(tokens))
valueArray = reflect.AppendSlice(valueArray, v)
for _, s := range tokens {
valueItem := reflect.New(v.Type().Elem())
if err := setType(valueItem.Elem(), s); err != nil {
return err
}
valueArray = reflect.Append(valueArray, valueItem.Elem())
}
reflect.New(v.Type().Elem())
v.Set(valueArray)
return nil
}
if newValue == "" && (v.Type().Kind() == reflect.Map || v.Type().Kind() == reflect.Struct) {
return nil
}
if v.Type().Kind() == reflect.Ptr {
val := reflect.New(v.Type().Elem())
if err := setType(val.Elem(), newValue); err != nil {
return err
}
v.Set(val)
return nil
}
t := v.Type().String()
if v.Type().Kind() == reflect.Map {
if v.IsNil() {
v.Set(reflect.MakeMap(v.Type()))
}
switch t {
case "map[string]string":
name, value, _ := strings.Cut(newValue, "=")
v.SetMapIndex(reflect.ValueOf(name), reflect.ValueOf(value))
case "map[string]intstr.IntOrString":
name, value, _ := strings.Cut(newValue, "=")
v.SetMapIndex(reflect.ValueOf(name), reflect.ValueOf(intstr.Parse(value)))
default:
return fmt.Errorf("unhandled type %q", t)
}
return nil
}
var newV reflect.Value
switch t {
case "string":
newV = reflect.ValueOf(newValue)
case "bool":
b, err := strconv.ParseBool(newValue)
if err != nil {
return fmt.Errorf("cannot interpret %q value as bool", newValue)
}
newV = reflect.ValueOf(b)
case "int64", "int32", "int16", "int":
v, err := strconv.Atoi(newValue)
if err != nil {
return fmt.Errorf("cannot interpret %q value as integer", newValue)
}
switch t {
case "int":
newV = reflect.ValueOf(v)
case "int16":
v16 := int16(v)
newV = reflect.ValueOf(v16)
case "int32":
v32 := int32(v)
newV = reflect.ValueOf(v32)
case "int64":
v64 := int64(v)
newV = reflect.ValueOf(v64)
default:
panic("missing case in int switch")
}
case "uint64", "uint32", "uint16", "uint":
v, err := strconv.Atoi(newValue)
if err != nil {
return fmt.Errorf("cannot interpret %q value as unsigned integer", newValue)
}
switch t {
case "uint":
newV = reflect.ValueOf(v)
case "uint16":
v16 := uint16(v)
newV = reflect.ValueOf(v16)
case "uint32":
v32 := uint32(v)
newV = reflect.ValueOf(v32)
case "uint64":
v64 := uint64(v)
newV = reflect.ValueOf(v64)
default:
panic("missing case in uint switch")
}
case "intstr.IntOrString":
newV = reflect.ValueOf(intstr.Parse(newValue))
case "kops.EnvVar":
name, value, found := strings.Cut(newValue, "=")
envVar := kops.EnvVar{
Name: name,
}
if found {
envVar.Value = value
}
newV = reflect.ValueOf(envVar)
case "v1.Duration":
duration, err := time.ParseDuration(newValue)
if err != nil {
return fmt.Errorf("cannot interpret %q value as v1.Duration", newValue)
}
newV = reflect.ValueOf(metav1.Duration{Duration: duration})
case "resource.Quantity":
quantity, err := resource.ParseQuantity(newValue)
if err != nil {
return fmt.Errorf("cannot interpret %q value as resource.Quantity", newValue)
}
newV = reflect.ValueOf(quantity)
default:
// This handles enums and other simple conversions
newV = reflect.ValueOf(newValue)
if newV.Type().ConvertibleTo(v.Type()) {
newV = newV.Convert(v.Type())
} else {
return fmt.Errorf("unhandled type %q", t)
}
}
v.Set(newV)
return nil
}
func Unset(target interface{}, targetPath string) error {
targetValue := reflect.ValueOf(target)
targetFieldPath, err := ParseFieldPath(targetPath)
if err != nil {
return fmt.Errorf("cannot parse field path %q: %w", targetPath, err)
}
fieldUnset := false
visitor := func(path *FieldPath, field *reflect.StructField, v reflect.Value) error {
if !targetFieldPath.HasPrefixMatch(path) {
return nil
}
if targetFieldPath.Matches(path) {
if !v.CanSet() {
return fmt.Errorf("cannot unset field %q (marked immutable)", path)
}
v.Set(reflect.Zero(v.Type()))
fieldUnset = true
return nil
}
return nil
}
err = ReflectRecursive(targetValue, visitor, &ReflectOptions{JSONNames: true})
if err != nil {
return err
}
if !fieldUnset {
return fmt.Errorf("field %s not found in %s", targetPath, BuildTypeName(reflect.TypeOf(target)))
}
return nil
}