diff options
author | Alex Pilon <apilon@hashicorp.com> | 2019-02-22 18:24:37 -0500 |
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committer | Alex Pilon <apilon@hashicorp.com> | 2019-02-22 18:24:37 -0500 |
commit | 15c0b25d011f37e7c20aeca9eaf461f78285b8d9 (patch) | |
tree | 255c250a5c9d4801c74092d33b7337d8c14438ff /vendor/github.com/golang/protobuf/proto/discard.go | |
parent | 07971ca38143c5faf951d152fba370ddcbe26ad5 (diff) | |
download | terraform-provider-statuscake-15c0b25d011f37e7c20aeca9eaf461f78285b8d9.tar.gz terraform-provider-statuscake-15c0b25d011f37e7c20aeca9eaf461f78285b8d9.tar.zst terraform-provider-statuscake-15c0b25d011f37e7c20aeca9eaf461f78285b8d9.zip |
deps: github.com/hashicorp/terraform@sdk-v0.11-with-go-modules
Updated via: go get github.com/hashicorp/terraform@sdk-v0.11-with-go-modules and go mod tidy
Diffstat (limited to 'vendor/github.com/golang/protobuf/proto/discard.go')
-rw-r--r-- | vendor/github.com/golang/protobuf/proto/discard.go | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/vendor/github.com/golang/protobuf/proto/discard.go b/vendor/github.com/golang/protobuf/proto/discard.go new file mode 100644 index 0000000..dea2617 --- /dev/null +++ b/vendor/github.com/golang/protobuf/proto/discard.go | |||
@@ -0,0 +1,350 @@ | |||
1 | // Go support for Protocol Buffers - Google's data interchange format | ||
2 | // | ||
3 | // Copyright 2017 The Go Authors. All rights reserved. | ||
4 | // https://github.com/golang/protobuf | ||
5 | // | ||
6 | // Redistribution and use in source and binary forms, with or without | ||
7 | // modification, are permitted provided that the following conditions are | ||
8 | // met: | ||
9 | // | ||
10 | // * Redistributions of source code must retain the above copyright | ||
11 | // notice, this list of conditions and the following disclaimer. | ||
12 | // * Redistributions in binary form must reproduce the above | ||
13 | // copyright notice, this list of conditions and the following disclaimer | ||
14 | // in the documentation and/or other materials provided with the | ||
15 | // distribution. | ||
16 | // * Neither the name of Google Inc. nor the names of its | ||
17 | // contributors may be used to endorse or promote products derived from | ||
18 | // this software without specific prior written permission. | ||
19 | // | ||
20 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
21 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
22 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
23 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
24 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
25 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
26 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
27 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
28 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
29 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
30 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
31 | |||
32 | package proto | ||
33 | |||
34 | import ( | ||
35 | "fmt" | ||
36 | "reflect" | ||
37 | "strings" | ||
38 | "sync" | ||
39 | "sync/atomic" | ||
40 | ) | ||
41 | |||
42 | type generatedDiscarder interface { | ||
43 | XXX_DiscardUnknown() | ||
44 | } | ||
45 | |||
46 | // DiscardUnknown recursively discards all unknown fields from this message | ||
47 | // and all embedded messages. | ||
48 | // | ||
49 | // When unmarshaling a message with unrecognized fields, the tags and values | ||
50 | // of such fields are preserved in the Message. This allows a later call to | ||
51 | // marshal to be able to produce a message that continues to have those | ||
52 | // unrecognized fields. To avoid this, DiscardUnknown is used to | ||
53 | // explicitly clear the unknown fields after unmarshaling. | ||
54 | // | ||
55 | // For proto2 messages, the unknown fields of message extensions are only | ||
56 | // discarded from messages that have been accessed via GetExtension. | ||
57 | func DiscardUnknown(m Message) { | ||
58 | if m, ok := m.(generatedDiscarder); ok { | ||
59 | m.XXX_DiscardUnknown() | ||
60 | return | ||
61 | } | ||
62 | // TODO: Dynamically populate a InternalMessageInfo for legacy messages, | ||
63 | // but the master branch has no implementation for InternalMessageInfo, | ||
64 | // so it would be more work to replicate that approach. | ||
65 | discardLegacy(m) | ||
66 | } | ||
67 | |||
68 | // DiscardUnknown recursively discards all unknown fields. | ||
69 | func (a *InternalMessageInfo) DiscardUnknown(m Message) { | ||
70 | di := atomicLoadDiscardInfo(&a.discard) | ||
71 | if di == nil { | ||
72 | di = getDiscardInfo(reflect.TypeOf(m).Elem()) | ||
73 | atomicStoreDiscardInfo(&a.discard, di) | ||
74 | } | ||
75 | di.discard(toPointer(&m)) | ||
76 | } | ||
77 | |||
78 | type discardInfo struct { | ||
79 | typ reflect.Type | ||
80 | |||
81 | initialized int32 // 0: only typ is valid, 1: everything is valid | ||
82 | lock sync.Mutex | ||
83 | |||
84 | fields []discardFieldInfo | ||
85 | unrecognized field | ||
86 | } | ||
87 | |||
88 | type discardFieldInfo struct { | ||
89 | field field // Offset of field, guaranteed to be valid | ||
90 | discard func(src pointer) | ||
91 | } | ||
92 | |||
93 | var ( | ||
94 | discardInfoMap = map[reflect.Type]*discardInfo{} | ||
95 | discardInfoLock sync.Mutex | ||
96 | ) | ||
97 | |||
98 | func getDiscardInfo(t reflect.Type) *discardInfo { | ||
99 | discardInfoLock.Lock() | ||
100 | defer discardInfoLock.Unlock() | ||
101 | di := discardInfoMap[t] | ||
102 | if di == nil { | ||
103 | di = &discardInfo{typ: t} | ||
104 | discardInfoMap[t] = di | ||
105 | } | ||
106 | return di | ||
107 | } | ||
108 | |||
109 | func (di *discardInfo) discard(src pointer) { | ||
110 | if src.isNil() { | ||
111 | return // Nothing to do. | ||
112 | } | ||
113 | |||
114 | if atomic.LoadInt32(&di.initialized) == 0 { | ||
115 | di.computeDiscardInfo() | ||
116 | } | ||
117 | |||
118 | for _, fi := range di.fields { | ||
119 | sfp := src.offset(fi.field) | ||
120 | fi.discard(sfp) | ||
121 | } | ||
122 | |||
123 | // For proto2 messages, only discard unknown fields in message extensions | ||
124 | // that have been accessed via GetExtension. | ||
125 | if em, err := extendable(src.asPointerTo(di.typ).Interface()); err == nil { | ||
126 | // Ignore lock since DiscardUnknown is not concurrency safe. | ||
127 | emm, _ := em.extensionsRead() | ||
128 | for _, mx := range emm { | ||
129 | if m, ok := mx.value.(Message); ok { | ||
130 | DiscardUnknown(m) | ||
131 | } | ||
132 | } | ||
133 | } | ||
134 | |||
135 | if di.unrecognized.IsValid() { | ||
136 | *src.offset(di.unrecognized).toBytes() = nil | ||
137 | } | ||
138 | } | ||
139 | |||
140 | func (di *discardInfo) computeDiscardInfo() { | ||
141 | di.lock.Lock() | ||
142 | defer di.lock.Unlock() | ||
143 | if di.initialized != 0 { | ||
144 | return | ||
145 | } | ||
146 | t := di.typ | ||
147 | n := t.NumField() | ||
148 | |||
149 | for i := 0; i < n; i++ { | ||
150 | f := t.Field(i) | ||
151 | if strings.HasPrefix(f.Name, "XXX_") { | ||
152 | continue | ||
153 | } | ||
154 | |||
155 | dfi := discardFieldInfo{field: toField(&f)} | ||
156 | tf := f.Type | ||
157 | |||
158 | // Unwrap tf to get its most basic type. | ||
159 | var isPointer, isSlice bool | ||
160 | if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 { | ||
161 | isSlice = true | ||
162 | tf = tf.Elem() | ||
163 | } | ||
164 | if tf.Kind() == reflect.Ptr { | ||
165 | isPointer = true | ||
166 | tf = tf.Elem() | ||
167 | } | ||
168 | if isPointer && isSlice && tf.Kind() != reflect.Struct { | ||
169 | panic(fmt.Sprintf("%v.%s cannot be a slice of pointers to primitive types", t, f.Name)) | ||
170 | } | ||
171 | |||
172 | switch tf.Kind() { | ||
173 | case reflect.Struct: | ||
174 | switch { | ||
175 | case !isPointer: | ||
176 | panic(fmt.Sprintf("%v.%s cannot be a direct struct value", t, f.Name)) | ||
177 | case isSlice: // E.g., []*pb.T | ||
178 | di := getDiscardInfo(tf) | ||
179 | dfi.discard = func(src pointer) { | ||
180 | sps := src.getPointerSlice() | ||
181 | for _, sp := range sps { | ||
182 | if !sp.isNil() { | ||
183 | di.discard(sp) | ||
184 | } | ||
185 | } | ||
186 | } | ||
187 | default: // E.g., *pb.T | ||
188 | di := getDiscardInfo(tf) | ||
189 | dfi.discard = func(src pointer) { | ||
190 | sp := src.getPointer() | ||
191 | if !sp.isNil() { | ||
192 | di.discard(sp) | ||
193 | } | ||
194 | } | ||
195 | } | ||
196 | case reflect.Map: | ||
197 | switch { | ||
198 | case isPointer || isSlice: | ||
199 | panic(fmt.Sprintf("%v.%s cannot be a pointer to a map or a slice of map values", t, f.Name)) | ||
200 | default: // E.g., map[K]V | ||
201 | if tf.Elem().Kind() == reflect.Ptr { // Proto struct (e.g., *T) | ||
202 | dfi.discard = func(src pointer) { | ||
203 | sm := src.asPointerTo(tf).Elem() | ||
204 | if sm.Len() == 0 { | ||
205 | return | ||
206 | } | ||
207 | for _, key := range sm.MapKeys() { | ||
208 | val := sm.MapIndex(key) | ||
209 | DiscardUnknown(val.Interface().(Message)) | ||
210 | } | ||
211 | } | ||
212 | } else { | ||
213 | dfi.discard = func(pointer) {} // Noop | ||
214 | } | ||
215 | } | ||
216 | case reflect.Interface: | ||
217 | // Must be oneof field. | ||
218 | switch { | ||
219 | case isPointer || isSlice: | ||
220 | panic(fmt.Sprintf("%v.%s cannot be a pointer to a interface or a slice of interface values", t, f.Name)) | ||
221 | default: // E.g., interface{} | ||
222 | // TODO: Make this faster? | ||
223 | dfi.discard = func(src pointer) { | ||
224 | su := src.asPointerTo(tf).Elem() | ||
225 | if !su.IsNil() { | ||
226 | sv := su.Elem().Elem().Field(0) | ||
227 | if sv.Kind() == reflect.Ptr && sv.IsNil() { | ||
228 | return | ||
229 | } | ||
230 | switch sv.Type().Kind() { | ||
231 | case reflect.Ptr: // Proto struct (e.g., *T) | ||
232 | DiscardUnknown(sv.Interface().(Message)) | ||
233 | } | ||
234 | } | ||
235 | } | ||
236 | } | ||
237 | default: | ||
238 | continue | ||
239 | } | ||
240 | di.fields = append(di.fields, dfi) | ||
241 | } | ||
242 | |||
243 | di.unrecognized = invalidField | ||
244 | if f, ok := t.FieldByName("XXX_unrecognized"); ok { | ||
245 | if f.Type != reflect.TypeOf([]byte{}) { | ||
246 | panic("expected XXX_unrecognized to be of type []byte") | ||
247 | } | ||
248 | di.unrecognized = toField(&f) | ||
249 | } | ||
250 | |||
251 | atomic.StoreInt32(&di.initialized, 1) | ||
252 | } | ||
253 | |||
254 | func discardLegacy(m Message) { | ||
255 | v := reflect.ValueOf(m) | ||
256 | if v.Kind() != reflect.Ptr || v.IsNil() { | ||
257 | return | ||
258 | } | ||
259 | v = v.Elem() | ||
260 | if v.Kind() != reflect.Struct { | ||
261 | return | ||
262 | } | ||
263 | t := v.Type() | ||
264 | |||
265 | for i := 0; i < v.NumField(); i++ { | ||
266 | f := t.Field(i) | ||
267 | if strings.HasPrefix(f.Name, "XXX_") { | ||
268 | continue | ||
269 | } | ||
270 | vf := v.Field(i) | ||
271 | tf := f.Type | ||
272 | |||
273 | // Unwrap tf to get its most basic type. | ||
274 | var isPointer, isSlice bool | ||
275 | if tf.Kind() == reflect.Slice && tf.Elem().Kind() != reflect.Uint8 { | ||
276 | isSlice = true | ||
277 | tf = tf.Elem() | ||
278 | } | ||
279 | if tf.Kind() == reflect.Ptr { | ||
280 | isPointer = true | ||
281 | tf = tf.Elem() | ||
282 | } | ||
283 | if isPointer && isSlice && tf.Kind() != reflect.Struct { | ||
284 | panic(fmt.Sprintf("%T.%s cannot be a slice of pointers to primitive types", m, f.Name)) | ||
285 | } | ||
286 | |||
287 | switch tf.Kind() { | ||
288 | case reflect.Struct: | ||
289 | switch { | ||
290 | case !isPointer: | ||
291 | panic(fmt.Sprintf("%T.%s cannot be a direct struct value", m, f.Name)) | ||
292 | case isSlice: // E.g., []*pb.T | ||
293 | for j := 0; j < vf.Len(); j++ { | ||
294 | discardLegacy(vf.Index(j).Interface().(Message)) | ||
295 | } | ||
296 | default: // E.g., *pb.T | ||
297 | discardLegacy(vf.Interface().(Message)) | ||
298 | } | ||
299 | case reflect.Map: | ||
300 | switch { | ||
301 | case isPointer || isSlice: | ||
302 | panic(fmt.Sprintf("%T.%s cannot be a pointer to a map or a slice of map values", m, f.Name)) | ||
303 | default: // E.g., map[K]V | ||
304 | tv := vf.Type().Elem() | ||
305 | if tv.Kind() == reflect.Ptr && tv.Implements(protoMessageType) { // Proto struct (e.g., *T) | ||
306 | for _, key := range vf.MapKeys() { | ||
307 | val := vf.MapIndex(key) | ||
308 | discardLegacy(val.Interface().(Message)) | ||
309 | } | ||
310 | } | ||
311 | } | ||
312 | case reflect.Interface: | ||
313 | // Must be oneof field. | ||
314 | switch { | ||
315 | case isPointer || isSlice: | ||
316 | panic(fmt.Sprintf("%T.%s cannot be a pointer to a interface or a slice of interface values", m, f.Name)) | ||
317 | default: // E.g., test_proto.isCommunique_Union interface | ||
318 | if !vf.IsNil() && f.Tag.Get("protobuf_oneof") != "" { | ||
319 | vf = vf.Elem() // E.g., *test_proto.Communique_Msg | ||
320 | if !vf.IsNil() { | ||
321 | vf = vf.Elem() // E.g., test_proto.Communique_Msg | ||
322 | vf = vf.Field(0) // E.g., Proto struct (e.g., *T) or primitive value | ||
323 | if vf.Kind() == reflect.Ptr { | ||
324 | discardLegacy(vf.Interface().(Message)) | ||
325 | } | ||
326 | } | ||
327 | } | ||
328 | } | ||
329 | } | ||
330 | } | ||
331 | |||
332 | if vf := v.FieldByName("XXX_unrecognized"); vf.IsValid() { | ||
333 | if vf.Type() != reflect.TypeOf([]byte{}) { | ||
334 | panic("expected XXX_unrecognized to be of type []byte") | ||
335 | } | ||
336 | vf.Set(reflect.ValueOf([]byte(nil))) | ||
337 | } | ||
338 | |||
339 | // For proto2 messages, only discard unknown fields in message extensions | ||
340 | // that have been accessed via GetExtension. | ||
341 | if em, err := extendable(m); err == nil { | ||
342 | // Ignore lock since discardLegacy is not concurrency safe. | ||
343 | emm, _ := em.extensionsRead() | ||
344 | for _, mx := range emm { | ||
345 | if m, ok := mx.value.(Message); ok { | ||
346 | discardLegacy(m) | ||
347 | } | ||
348 | } | ||
349 | } | ||
350 | } | ||