khenaidoo | 5fc5cea | 2021-08-11 17:39:16 -0400 | [diff] [blame] | 1 | // Copyright 2018 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package impl |
| 6 | |
| 7 | import ( |
| 8 | "fmt" |
| 9 | "reflect" |
| 10 | "strings" |
| 11 | "sync" |
| 12 | |
| 13 | "google.golang.org/protobuf/internal/descopts" |
| 14 | ptag "google.golang.org/protobuf/internal/encoding/tag" |
| 15 | "google.golang.org/protobuf/internal/errors" |
| 16 | "google.golang.org/protobuf/internal/filedesc" |
| 17 | "google.golang.org/protobuf/internal/strs" |
| 18 | "google.golang.org/protobuf/reflect/protoreflect" |
| 19 | pref "google.golang.org/protobuf/reflect/protoreflect" |
| 20 | "google.golang.org/protobuf/runtime/protoiface" |
| 21 | piface "google.golang.org/protobuf/runtime/protoiface" |
| 22 | ) |
| 23 | |
| 24 | // legacyWrapMessage wraps v as a protoreflect.Message, |
| 25 | // where v must be a *struct kind and not implement the v2 API already. |
| 26 | func legacyWrapMessage(v reflect.Value) pref.Message { |
| 27 | t := v.Type() |
| 28 | if t.Kind() != reflect.Ptr || t.Elem().Kind() != reflect.Struct { |
| 29 | return aberrantMessage{v: v} |
| 30 | } |
| 31 | mt := legacyLoadMessageInfo(t, "") |
| 32 | return mt.MessageOf(v.Interface()) |
| 33 | } |
| 34 | |
| 35 | // legacyLoadMessageType dynamically loads a protoreflect.Type for t, |
| 36 | // where t must be not implement the v2 API already. |
| 37 | // The provided name is used if it cannot be determined from the message. |
| 38 | func legacyLoadMessageType(t reflect.Type, name pref.FullName) protoreflect.MessageType { |
| 39 | if t.Kind() != reflect.Ptr || t.Elem().Kind() != reflect.Struct { |
| 40 | return aberrantMessageType{t} |
| 41 | } |
| 42 | return legacyLoadMessageInfo(t, name) |
| 43 | } |
| 44 | |
| 45 | var legacyMessageTypeCache sync.Map // map[reflect.Type]*MessageInfo |
| 46 | |
| 47 | // legacyLoadMessageInfo dynamically loads a *MessageInfo for t, |
| 48 | // where t must be a *struct kind and not implement the v2 API already. |
| 49 | // The provided name is used if it cannot be determined from the message. |
| 50 | func legacyLoadMessageInfo(t reflect.Type, name pref.FullName) *MessageInfo { |
| 51 | // Fast-path: check if a MessageInfo is cached for this concrete type. |
| 52 | if mt, ok := legacyMessageTypeCache.Load(t); ok { |
| 53 | return mt.(*MessageInfo) |
| 54 | } |
| 55 | |
| 56 | // Slow-path: derive message descriptor and initialize MessageInfo. |
| 57 | mi := &MessageInfo{ |
| 58 | Desc: legacyLoadMessageDesc(t, name), |
| 59 | GoReflectType: t, |
| 60 | } |
| 61 | |
| 62 | var hasMarshal, hasUnmarshal bool |
| 63 | v := reflect.Zero(t).Interface() |
| 64 | if _, hasMarshal = v.(legacyMarshaler); hasMarshal { |
| 65 | mi.methods.Marshal = legacyMarshal |
| 66 | |
| 67 | // We have no way to tell whether the type's Marshal method |
| 68 | // supports deterministic serialization or not, but this |
| 69 | // preserves the v1 implementation's behavior of always |
| 70 | // calling Marshal methods when present. |
| 71 | mi.methods.Flags |= piface.SupportMarshalDeterministic |
| 72 | } |
| 73 | if _, hasUnmarshal = v.(legacyUnmarshaler); hasUnmarshal { |
| 74 | mi.methods.Unmarshal = legacyUnmarshal |
| 75 | } |
| 76 | if _, hasMerge := v.(legacyMerger); hasMerge || (hasMarshal && hasUnmarshal) { |
| 77 | mi.methods.Merge = legacyMerge |
| 78 | } |
| 79 | |
| 80 | if mi, ok := legacyMessageTypeCache.LoadOrStore(t, mi); ok { |
| 81 | return mi.(*MessageInfo) |
| 82 | } |
| 83 | return mi |
| 84 | } |
| 85 | |
| 86 | var legacyMessageDescCache sync.Map // map[reflect.Type]protoreflect.MessageDescriptor |
| 87 | |
| 88 | // LegacyLoadMessageDesc returns an MessageDescriptor derived from the Go type, |
| 89 | // which should be a *struct kind and must not implement the v2 API already. |
| 90 | // |
| 91 | // This is exported for testing purposes. |
| 92 | func LegacyLoadMessageDesc(t reflect.Type) pref.MessageDescriptor { |
| 93 | return legacyLoadMessageDesc(t, "") |
| 94 | } |
| 95 | func legacyLoadMessageDesc(t reflect.Type, name pref.FullName) pref.MessageDescriptor { |
| 96 | // Fast-path: check if a MessageDescriptor is cached for this concrete type. |
| 97 | if mi, ok := legacyMessageDescCache.Load(t); ok { |
| 98 | return mi.(pref.MessageDescriptor) |
| 99 | } |
| 100 | |
| 101 | // Slow-path: initialize MessageDescriptor from the raw descriptor. |
| 102 | mv := reflect.Zero(t).Interface() |
| 103 | if _, ok := mv.(pref.ProtoMessage); ok { |
| 104 | panic(fmt.Sprintf("%v already implements proto.Message", t)) |
| 105 | } |
| 106 | mdV1, ok := mv.(messageV1) |
| 107 | if !ok { |
| 108 | return aberrantLoadMessageDesc(t, name) |
| 109 | } |
| 110 | |
| 111 | // If this is a dynamic message type where there isn't a 1-1 mapping between |
| 112 | // Go and protobuf types, calling the Descriptor method on the zero value of |
| 113 | // the message type isn't likely to work. If it panics, swallow the panic and |
| 114 | // continue as if the Descriptor method wasn't present. |
| 115 | b, idxs := func() ([]byte, []int) { |
| 116 | defer func() { |
| 117 | recover() |
| 118 | }() |
| 119 | return mdV1.Descriptor() |
| 120 | }() |
| 121 | if b == nil { |
| 122 | return aberrantLoadMessageDesc(t, name) |
| 123 | } |
| 124 | |
| 125 | // If the Go type has no fields, then this might be a proto3 empty message |
| 126 | // from before the size cache was added. If there are any fields, check to |
| 127 | // see that at least one of them looks like something we generated. |
| 128 | if t.Elem().Kind() == reflect.Struct { |
| 129 | if nfield := t.Elem().NumField(); nfield > 0 { |
| 130 | hasProtoField := false |
| 131 | for i := 0; i < nfield; i++ { |
| 132 | f := t.Elem().Field(i) |
| 133 | if f.Tag.Get("protobuf") != "" || f.Tag.Get("protobuf_oneof") != "" || strings.HasPrefix(f.Name, "XXX_") { |
| 134 | hasProtoField = true |
| 135 | break |
| 136 | } |
| 137 | } |
| 138 | if !hasProtoField { |
| 139 | return aberrantLoadMessageDesc(t, name) |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | md := legacyLoadFileDesc(b).Messages().Get(idxs[0]) |
| 145 | for _, i := range idxs[1:] { |
| 146 | md = md.Messages().Get(i) |
| 147 | } |
| 148 | if name != "" && md.FullName() != name { |
| 149 | panic(fmt.Sprintf("mismatching message name: got %v, want %v", md.FullName(), name)) |
| 150 | } |
| 151 | if md, ok := legacyMessageDescCache.LoadOrStore(t, md); ok { |
| 152 | return md.(protoreflect.MessageDescriptor) |
| 153 | } |
| 154 | return md |
| 155 | } |
| 156 | |
| 157 | var ( |
| 158 | aberrantMessageDescLock sync.Mutex |
| 159 | aberrantMessageDescCache map[reflect.Type]protoreflect.MessageDescriptor |
| 160 | ) |
| 161 | |
| 162 | // aberrantLoadMessageDesc returns an MessageDescriptor derived from the Go type, |
| 163 | // which must not implement protoreflect.ProtoMessage or messageV1. |
| 164 | // |
| 165 | // This is a best-effort derivation of the message descriptor using the protobuf |
| 166 | // tags on the struct fields. |
| 167 | func aberrantLoadMessageDesc(t reflect.Type, name pref.FullName) pref.MessageDescriptor { |
| 168 | aberrantMessageDescLock.Lock() |
| 169 | defer aberrantMessageDescLock.Unlock() |
| 170 | if aberrantMessageDescCache == nil { |
| 171 | aberrantMessageDescCache = make(map[reflect.Type]protoreflect.MessageDescriptor) |
| 172 | } |
| 173 | return aberrantLoadMessageDescReentrant(t, name) |
| 174 | } |
| 175 | func aberrantLoadMessageDescReentrant(t reflect.Type, name pref.FullName) pref.MessageDescriptor { |
| 176 | // Fast-path: check if an MessageDescriptor is cached for this concrete type. |
| 177 | if md, ok := aberrantMessageDescCache[t]; ok { |
| 178 | return md |
| 179 | } |
| 180 | |
| 181 | // Slow-path: construct a descriptor from the Go struct type (best-effort). |
| 182 | // Cache the MessageDescriptor early on so that we can resolve internal |
| 183 | // cyclic references. |
| 184 | md := &filedesc.Message{L2: new(filedesc.MessageL2)} |
| 185 | md.L0.FullName = aberrantDeriveMessageName(t, name) |
| 186 | md.L0.ParentFile = filedesc.SurrogateProto2 |
| 187 | aberrantMessageDescCache[t] = md |
| 188 | |
| 189 | if t.Kind() != reflect.Ptr || t.Elem().Kind() != reflect.Struct { |
| 190 | return md |
| 191 | } |
| 192 | |
| 193 | // Try to determine if the message is using proto3 by checking scalars. |
| 194 | for i := 0; i < t.Elem().NumField(); i++ { |
| 195 | f := t.Elem().Field(i) |
| 196 | if tag := f.Tag.Get("protobuf"); tag != "" { |
| 197 | switch f.Type.Kind() { |
| 198 | case reflect.Bool, reflect.Int32, reflect.Int64, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64, reflect.String: |
| 199 | md.L0.ParentFile = filedesc.SurrogateProto3 |
| 200 | } |
| 201 | for _, s := range strings.Split(tag, ",") { |
| 202 | if s == "proto3" { |
| 203 | md.L0.ParentFile = filedesc.SurrogateProto3 |
| 204 | } |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | // Obtain a list of oneof wrapper types. |
| 210 | var oneofWrappers []reflect.Type |
| 211 | for _, method := range []string{"XXX_OneofFuncs", "XXX_OneofWrappers"} { |
| 212 | if fn, ok := t.MethodByName(method); ok { |
| 213 | for _, v := range fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))}) { |
| 214 | if vs, ok := v.Interface().([]interface{}); ok { |
| 215 | for _, v := range vs { |
| 216 | oneofWrappers = append(oneofWrappers, reflect.TypeOf(v)) |
| 217 | } |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | // Obtain a list of the extension ranges. |
| 224 | if fn, ok := t.MethodByName("ExtensionRangeArray"); ok { |
| 225 | vs := fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))})[0] |
| 226 | for i := 0; i < vs.Len(); i++ { |
| 227 | v := vs.Index(i) |
| 228 | md.L2.ExtensionRanges.List = append(md.L2.ExtensionRanges.List, [2]pref.FieldNumber{ |
| 229 | pref.FieldNumber(v.FieldByName("Start").Int()), |
| 230 | pref.FieldNumber(v.FieldByName("End").Int() + 1), |
| 231 | }) |
| 232 | md.L2.ExtensionRangeOptions = append(md.L2.ExtensionRangeOptions, nil) |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | // Derive the message fields by inspecting the struct fields. |
| 237 | for i := 0; i < t.Elem().NumField(); i++ { |
| 238 | f := t.Elem().Field(i) |
| 239 | if tag := f.Tag.Get("protobuf"); tag != "" { |
| 240 | tagKey := f.Tag.Get("protobuf_key") |
| 241 | tagVal := f.Tag.Get("protobuf_val") |
| 242 | aberrantAppendField(md, f.Type, tag, tagKey, tagVal) |
| 243 | } |
| 244 | if tag := f.Tag.Get("protobuf_oneof"); tag != "" { |
| 245 | n := len(md.L2.Oneofs.List) |
| 246 | md.L2.Oneofs.List = append(md.L2.Oneofs.List, filedesc.Oneof{}) |
| 247 | od := &md.L2.Oneofs.List[n] |
| 248 | od.L0.FullName = md.FullName().Append(pref.Name(tag)) |
| 249 | od.L0.ParentFile = md.L0.ParentFile |
| 250 | od.L0.Parent = md |
| 251 | od.L0.Index = n |
| 252 | |
| 253 | for _, t := range oneofWrappers { |
| 254 | if t.Implements(f.Type) { |
| 255 | f := t.Elem().Field(0) |
| 256 | if tag := f.Tag.Get("protobuf"); tag != "" { |
| 257 | aberrantAppendField(md, f.Type, tag, "", "") |
| 258 | fd := &md.L2.Fields.List[len(md.L2.Fields.List)-1] |
| 259 | fd.L1.ContainingOneof = od |
| 260 | od.L1.Fields.List = append(od.L1.Fields.List, fd) |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | return md |
| 268 | } |
| 269 | |
| 270 | func aberrantDeriveMessageName(t reflect.Type, name pref.FullName) pref.FullName { |
| 271 | if name.IsValid() { |
| 272 | return name |
| 273 | } |
| 274 | func() { |
| 275 | defer func() { recover() }() // swallow possible nil panics |
| 276 | if m, ok := reflect.Zero(t).Interface().(interface{ XXX_MessageName() string }); ok { |
| 277 | name = pref.FullName(m.XXX_MessageName()) |
| 278 | } |
| 279 | }() |
| 280 | if name.IsValid() { |
| 281 | return name |
| 282 | } |
| 283 | if t.Kind() == reflect.Ptr { |
| 284 | t = t.Elem() |
| 285 | } |
| 286 | return AberrantDeriveFullName(t) |
| 287 | } |
| 288 | |
| 289 | func aberrantAppendField(md *filedesc.Message, goType reflect.Type, tag, tagKey, tagVal string) { |
| 290 | t := goType |
| 291 | isOptional := t.Kind() == reflect.Ptr && t.Elem().Kind() != reflect.Struct |
| 292 | isRepeated := t.Kind() == reflect.Slice && t.Elem().Kind() != reflect.Uint8 |
| 293 | if isOptional || isRepeated { |
| 294 | t = t.Elem() |
| 295 | } |
| 296 | fd := ptag.Unmarshal(tag, t, placeholderEnumValues{}).(*filedesc.Field) |
| 297 | |
| 298 | // Append field descriptor to the message. |
| 299 | n := len(md.L2.Fields.List) |
| 300 | md.L2.Fields.List = append(md.L2.Fields.List, *fd) |
| 301 | fd = &md.L2.Fields.List[n] |
| 302 | fd.L0.FullName = md.FullName().Append(fd.Name()) |
| 303 | fd.L0.ParentFile = md.L0.ParentFile |
| 304 | fd.L0.Parent = md |
| 305 | fd.L0.Index = n |
| 306 | |
| 307 | if fd.L1.IsWeak || fd.L1.HasPacked { |
| 308 | fd.L1.Options = func() pref.ProtoMessage { |
| 309 | opts := descopts.Field.ProtoReflect().New() |
| 310 | if fd.L1.IsWeak { |
| 311 | opts.Set(opts.Descriptor().Fields().ByName("weak"), protoreflect.ValueOfBool(true)) |
| 312 | } |
| 313 | if fd.L1.HasPacked { |
| 314 | opts.Set(opts.Descriptor().Fields().ByName("packed"), protoreflect.ValueOfBool(fd.L1.IsPacked)) |
| 315 | } |
| 316 | return opts.Interface() |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | // Populate Enum and Message. |
| 321 | if fd.Enum() == nil && fd.Kind() == pref.EnumKind { |
| 322 | switch v := reflect.Zero(t).Interface().(type) { |
| 323 | case pref.Enum: |
| 324 | fd.L1.Enum = v.Descriptor() |
| 325 | default: |
| 326 | fd.L1.Enum = LegacyLoadEnumDesc(t) |
| 327 | } |
| 328 | } |
| 329 | if fd.Message() == nil && (fd.Kind() == pref.MessageKind || fd.Kind() == pref.GroupKind) { |
| 330 | switch v := reflect.Zero(t).Interface().(type) { |
| 331 | case pref.ProtoMessage: |
| 332 | fd.L1.Message = v.ProtoReflect().Descriptor() |
| 333 | case messageV1: |
| 334 | fd.L1.Message = LegacyLoadMessageDesc(t) |
| 335 | default: |
| 336 | if t.Kind() == reflect.Map { |
| 337 | n := len(md.L1.Messages.List) |
| 338 | md.L1.Messages.List = append(md.L1.Messages.List, filedesc.Message{L2: new(filedesc.MessageL2)}) |
| 339 | md2 := &md.L1.Messages.List[n] |
| 340 | md2.L0.FullName = md.FullName().Append(pref.Name(strs.MapEntryName(string(fd.Name())))) |
| 341 | md2.L0.ParentFile = md.L0.ParentFile |
| 342 | md2.L0.Parent = md |
| 343 | md2.L0.Index = n |
| 344 | |
| 345 | md2.L1.IsMapEntry = true |
| 346 | md2.L2.Options = func() pref.ProtoMessage { |
| 347 | opts := descopts.Message.ProtoReflect().New() |
| 348 | opts.Set(opts.Descriptor().Fields().ByName("map_entry"), protoreflect.ValueOfBool(true)) |
| 349 | return opts.Interface() |
| 350 | } |
| 351 | |
| 352 | aberrantAppendField(md2, t.Key(), tagKey, "", "") |
| 353 | aberrantAppendField(md2, t.Elem(), tagVal, "", "") |
| 354 | |
| 355 | fd.L1.Message = md2 |
| 356 | break |
| 357 | } |
| 358 | fd.L1.Message = aberrantLoadMessageDescReentrant(t, "") |
| 359 | } |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | type placeholderEnumValues struct { |
| 364 | protoreflect.EnumValueDescriptors |
| 365 | } |
| 366 | |
| 367 | func (placeholderEnumValues) ByNumber(n pref.EnumNumber) pref.EnumValueDescriptor { |
| 368 | return filedesc.PlaceholderEnumValue(pref.FullName(fmt.Sprintf("UNKNOWN_%d", n))) |
| 369 | } |
| 370 | |
| 371 | // legacyMarshaler is the proto.Marshaler interface superseded by protoiface.Methoder. |
| 372 | type legacyMarshaler interface { |
| 373 | Marshal() ([]byte, error) |
| 374 | } |
| 375 | |
| 376 | // legacyUnmarshaler is the proto.Unmarshaler interface superseded by protoiface.Methoder. |
| 377 | type legacyUnmarshaler interface { |
| 378 | Unmarshal([]byte) error |
| 379 | } |
| 380 | |
| 381 | // legacyMerger is the proto.Merger interface superseded by protoiface.Methoder. |
| 382 | type legacyMerger interface { |
| 383 | Merge(protoiface.MessageV1) |
| 384 | } |
| 385 | |
| 386 | var aberrantProtoMethods = &piface.Methods{ |
| 387 | Marshal: legacyMarshal, |
| 388 | Unmarshal: legacyUnmarshal, |
| 389 | Merge: legacyMerge, |
| 390 | |
| 391 | // We have no way to tell whether the type's Marshal method |
| 392 | // supports deterministic serialization or not, but this |
| 393 | // preserves the v1 implementation's behavior of always |
| 394 | // calling Marshal methods when present. |
| 395 | Flags: piface.SupportMarshalDeterministic, |
| 396 | } |
| 397 | |
| 398 | func legacyMarshal(in piface.MarshalInput) (piface.MarshalOutput, error) { |
| 399 | v := in.Message.(unwrapper).protoUnwrap() |
| 400 | marshaler, ok := v.(legacyMarshaler) |
| 401 | if !ok { |
| 402 | return piface.MarshalOutput{}, errors.New("%T does not implement Marshal", v) |
| 403 | } |
| 404 | out, err := marshaler.Marshal() |
| 405 | if in.Buf != nil { |
| 406 | out = append(in.Buf, out...) |
| 407 | } |
| 408 | return piface.MarshalOutput{ |
| 409 | Buf: out, |
| 410 | }, err |
| 411 | } |
| 412 | |
| 413 | func legacyUnmarshal(in piface.UnmarshalInput) (piface.UnmarshalOutput, error) { |
| 414 | v := in.Message.(unwrapper).protoUnwrap() |
| 415 | unmarshaler, ok := v.(legacyUnmarshaler) |
| 416 | if !ok { |
| 417 | return piface.UnmarshalOutput{}, errors.New("%T does not implement Unmarshal", v) |
| 418 | } |
| 419 | return piface.UnmarshalOutput{}, unmarshaler.Unmarshal(in.Buf) |
| 420 | } |
| 421 | |
| 422 | func legacyMerge(in piface.MergeInput) piface.MergeOutput { |
| 423 | // Check whether this supports the legacy merger. |
| 424 | dstv := in.Destination.(unwrapper).protoUnwrap() |
| 425 | merger, ok := dstv.(legacyMerger) |
| 426 | if ok { |
| 427 | merger.Merge(Export{}.ProtoMessageV1Of(in.Source)) |
| 428 | return piface.MergeOutput{Flags: piface.MergeComplete} |
| 429 | } |
| 430 | |
| 431 | // If legacy merger is unavailable, implement merge in terms of |
| 432 | // a marshal and unmarshal operation. |
| 433 | srcv := in.Source.(unwrapper).protoUnwrap() |
| 434 | marshaler, ok := srcv.(legacyMarshaler) |
| 435 | if !ok { |
| 436 | return piface.MergeOutput{} |
| 437 | } |
| 438 | dstv = in.Destination.(unwrapper).protoUnwrap() |
| 439 | unmarshaler, ok := dstv.(legacyUnmarshaler) |
| 440 | if !ok { |
| 441 | return piface.MergeOutput{} |
| 442 | } |
| 443 | if !in.Source.IsValid() { |
| 444 | // Legacy Marshal methods may not function on nil messages. |
| 445 | // Check for a typed nil source only after we confirm that |
| 446 | // legacy Marshal/Unmarshal methods are present, for |
| 447 | // consistency. |
| 448 | return piface.MergeOutput{Flags: piface.MergeComplete} |
| 449 | } |
| 450 | b, err := marshaler.Marshal() |
| 451 | if err != nil { |
| 452 | return piface.MergeOutput{} |
| 453 | } |
| 454 | err = unmarshaler.Unmarshal(b) |
| 455 | if err != nil { |
| 456 | return piface.MergeOutput{} |
| 457 | } |
| 458 | return piface.MergeOutput{Flags: piface.MergeComplete} |
| 459 | } |
| 460 | |
| 461 | // aberrantMessageType implements MessageType for all types other than pointer-to-struct. |
| 462 | type aberrantMessageType struct { |
| 463 | t reflect.Type |
| 464 | } |
| 465 | |
| 466 | func (mt aberrantMessageType) New() pref.Message { |
| 467 | if mt.t.Kind() == reflect.Ptr { |
| 468 | return aberrantMessage{reflect.New(mt.t.Elem())} |
| 469 | } |
| 470 | return aberrantMessage{reflect.Zero(mt.t)} |
| 471 | } |
| 472 | func (mt aberrantMessageType) Zero() pref.Message { |
| 473 | return aberrantMessage{reflect.Zero(mt.t)} |
| 474 | } |
| 475 | func (mt aberrantMessageType) GoType() reflect.Type { |
| 476 | return mt.t |
| 477 | } |
| 478 | func (mt aberrantMessageType) Descriptor() pref.MessageDescriptor { |
| 479 | return LegacyLoadMessageDesc(mt.t) |
| 480 | } |
| 481 | |
| 482 | // aberrantMessage implements Message for all types other than pointer-to-struct. |
| 483 | // |
| 484 | // When the underlying type implements legacyMarshaler or legacyUnmarshaler, |
| 485 | // the aberrant Message can be marshaled or unmarshaled. Otherwise, there is |
| 486 | // not much that can be done with values of this type. |
| 487 | type aberrantMessage struct { |
| 488 | v reflect.Value |
| 489 | } |
| 490 | |
| 491 | // Reset implements the v1 proto.Message.Reset method. |
| 492 | func (m aberrantMessage) Reset() { |
| 493 | if mr, ok := m.v.Interface().(interface{ Reset() }); ok { |
| 494 | mr.Reset() |
| 495 | return |
| 496 | } |
| 497 | if m.v.Kind() == reflect.Ptr && !m.v.IsNil() { |
| 498 | m.v.Elem().Set(reflect.Zero(m.v.Type().Elem())) |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | func (m aberrantMessage) ProtoReflect() pref.Message { |
| 503 | return m |
| 504 | } |
| 505 | |
| 506 | func (m aberrantMessage) Descriptor() pref.MessageDescriptor { |
| 507 | return LegacyLoadMessageDesc(m.v.Type()) |
| 508 | } |
| 509 | func (m aberrantMessage) Type() pref.MessageType { |
| 510 | return aberrantMessageType{m.v.Type()} |
| 511 | } |
| 512 | func (m aberrantMessage) New() pref.Message { |
| 513 | if m.v.Type().Kind() == reflect.Ptr { |
| 514 | return aberrantMessage{reflect.New(m.v.Type().Elem())} |
| 515 | } |
| 516 | return aberrantMessage{reflect.Zero(m.v.Type())} |
| 517 | } |
| 518 | func (m aberrantMessage) Interface() pref.ProtoMessage { |
| 519 | return m |
| 520 | } |
| 521 | func (m aberrantMessage) Range(f func(pref.FieldDescriptor, pref.Value) bool) { |
| 522 | return |
| 523 | } |
| 524 | func (m aberrantMessage) Has(pref.FieldDescriptor) bool { |
| 525 | return false |
| 526 | } |
| 527 | func (m aberrantMessage) Clear(pref.FieldDescriptor) { |
| 528 | panic("invalid Message.Clear on " + string(m.Descriptor().FullName())) |
| 529 | } |
| 530 | func (m aberrantMessage) Get(fd pref.FieldDescriptor) pref.Value { |
| 531 | if fd.Default().IsValid() { |
| 532 | return fd.Default() |
| 533 | } |
| 534 | panic("invalid Message.Get on " + string(m.Descriptor().FullName())) |
| 535 | } |
| 536 | func (m aberrantMessage) Set(pref.FieldDescriptor, pref.Value) { |
| 537 | panic("invalid Message.Set on " + string(m.Descriptor().FullName())) |
| 538 | } |
| 539 | func (m aberrantMessage) Mutable(pref.FieldDescriptor) pref.Value { |
| 540 | panic("invalid Message.Mutable on " + string(m.Descriptor().FullName())) |
| 541 | } |
| 542 | func (m aberrantMessage) NewField(pref.FieldDescriptor) pref.Value { |
| 543 | panic("invalid Message.NewField on " + string(m.Descriptor().FullName())) |
| 544 | } |
| 545 | func (m aberrantMessage) WhichOneof(pref.OneofDescriptor) pref.FieldDescriptor { |
| 546 | panic("invalid Message.WhichOneof descriptor on " + string(m.Descriptor().FullName())) |
| 547 | } |
| 548 | func (m aberrantMessage) GetUnknown() pref.RawFields { |
| 549 | return nil |
| 550 | } |
| 551 | func (m aberrantMessage) SetUnknown(pref.RawFields) { |
| 552 | // SetUnknown discards its input on messages which don't support unknown field storage. |
| 553 | } |
| 554 | func (m aberrantMessage) IsValid() bool { |
| 555 | if m.v.Kind() == reflect.Ptr { |
| 556 | return !m.v.IsNil() |
| 557 | } |
| 558 | return false |
| 559 | } |
| 560 | func (m aberrantMessage) ProtoMethods() *piface.Methods { |
| 561 | return aberrantProtoMethods |
| 562 | } |
| 563 | func (m aberrantMessage) protoUnwrap() interface{} { |
| 564 | return m.v.Interface() |
| 565 | } |