Prince Pereira | c1c21d6 | 2021-04-22 08:38:15 +0000 | [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 protoregistry provides data structures to register and lookup |
| 6 | // protobuf descriptor types. |
| 7 | // |
| 8 | // The Files registry contains file descriptors and provides the ability |
| 9 | // to iterate over the files or lookup a specific descriptor within the files. |
| 10 | // Files only contains protobuf descriptors and has no understanding of Go |
| 11 | // type information that may be associated with each descriptor. |
| 12 | // |
| 13 | // The Types registry contains descriptor types for which there is a known |
| 14 | // Go type associated with that descriptor. It provides the ability to iterate |
| 15 | // over the registered types or lookup a type by name. |
| 16 | package protoregistry |
| 17 | |
| 18 | import ( |
| 19 | "fmt" |
| 20 | "log" |
| 21 | "strings" |
| 22 | "sync" |
| 23 | |
| 24 | "google.golang.org/protobuf/internal/errors" |
| 25 | "google.golang.org/protobuf/reflect/protoreflect" |
| 26 | ) |
| 27 | |
| 28 | // ignoreConflict reports whether to ignore a registration conflict |
| 29 | // given the descriptor being registered and the error. |
| 30 | // It is a variable so that the behavior is easily overridden in another file. |
| 31 | var ignoreConflict = func(d protoreflect.Descriptor, err error) bool { |
| 32 | log.Printf(""+ |
| 33 | "WARNING: %v\n"+ |
| 34 | "A future release will panic on registration conflicts. See:\n"+ |
| 35 | "https://developers.google.com/protocol-buffers/docs/reference/go/faq#namespace-conflict\n"+ |
| 36 | "\n", err) |
| 37 | return true |
| 38 | } |
| 39 | |
| 40 | var globalMutex sync.RWMutex |
| 41 | |
| 42 | // GlobalFiles is a global registry of file descriptors. |
| 43 | var GlobalFiles *Files = new(Files) |
| 44 | |
| 45 | // GlobalTypes is the registry used by default for type lookups |
| 46 | // unless a local registry is provided by the user. |
| 47 | var GlobalTypes *Types = new(Types) |
| 48 | |
| 49 | // NotFound is a sentinel error value to indicate that the type was not found. |
| 50 | // |
| 51 | // Since registry lookup can happen in the critical performance path, resolvers |
| 52 | // must return this exact error value, not an error wrapping it. |
| 53 | var NotFound = errors.New("not found") |
| 54 | |
| 55 | // Files is a registry for looking up or iterating over files and the |
| 56 | // descriptors contained within them. |
| 57 | // The Find and Range methods are safe for concurrent use. |
| 58 | type Files struct { |
| 59 | // The map of descsByName contains: |
| 60 | // EnumDescriptor |
| 61 | // EnumValueDescriptor |
| 62 | // MessageDescriptor |
| 63 | // ExtensionDescriptor |
| 64 | // ServiceDescriptor |
| 65 | // *packageDescriptor |
| 66 | // |
| 67 | // Note that files are stored as a slice, since a package may contain |
| 68 | // multiple files. Only top-level declarations are registered. |
| 69 | // Note that enum values are in the top-level since that are in the same |
| 70 | // scope as the parent enum. |
| 71 | descsByName map[protoreflect.FullName]interface{} |
| 72 | filesByPath map[string]protoreflect.FileDescriptor |
| 73 | } |
| 74 | |
| 75 | type packageDescriptor struct { |
| 76 | files []protoreflect.FileDescriptor |
| 77 | } |
| 78 | |
| 79 | // RegisterFile registers the provided file descriptor. |
| 80 | // |
| 81 | // If any descriptor within the file conflicts with the descriptor of any |
| 82 | // previously registered file (e.g., two enums with the same full name), |
| 83 | // then the file is not registered and an error is returned. |
| 84 | // |
| 85 | // It is permitted for multiple files to have the same file path. |
| 86 | func (r *Files) RegisterFile(file protoreflect.FileDescriptor) error { |
| 87 | if r == GlobalFiles { |
| 88 | globalMutex.Lock() |
| 89 | defer globalMutex.Unlock() |
| 90 | } |
| 91 | if r.descsByName == nil { |
| 92 | r.descsByName = map[protoreflect.FullName]interface{}{ |
| 93 | "": &packageDescriptor{}, |
| 94 | } |
| 95 | r.filesByPath = make(map[string]protoreflect.FileDescriptor) |
| 96 | } |
| 97 | path := file.Path() |
| 98 | if prev := r.filesByPath[path]; prev != nil { |
| 99 | err := errors.New("file %q is already registered", file.Path()) |
| 100 | err = amendErrorWithCaller(err, prev, file) |
| 101 | if r == GlobalFiles && ignoreConflict(file, err) { |
| 102 | err = nil |
| 103 | } |
| 104 | return err |
| 105 | } |
| 106 | |
| 107 | for name := file.Package(); name != ""; name = name.Parent() { |
| 108 | switch prev := r.descsByName[name]; prev.(type) { |
| 109 | case nil, *packageDescriptor: |
| 110 | default: |
| 111 | err := errors.New("file %q has a package name conflict over %v", file.Path(), name) |
| 112 | err = amendErrorWithCaller(err, prev, file) |
| 113 | if r == GlobalFiles && ignoreConflict(file, err) { |
| 114 | err = nil |
| 115 | } |
| 116 | return err |
| 117 | } |
| 118 | } |
| 119 | var err error |
| 120 | var hasConflict bool |
| 121 | rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) { |
| 122 | if prev := r.descsByName[d.FullName()]; prev != nil { |
| 123 | hasConflict = true |
| 124 | err = errors.New("file %q has a name conflict over %v", file.Path(), d.FullName()) |
| 125 | err = amendErrorWithCaller(err, prev, file) |
| 126 | if r == GlobalFiles && ignoreConflict(d, err) { |
| 127 | err = nil |
| 128 | } |
| 129 | } |
| 130 | }) |
| 131 | if hasConflict { |
| 132 | return err |
| 133 | } |
| 134 | |
| 135 | for name := file.Package(); name != ""; name = name.Parent() { |
| 136 | if r.descsByName[name] == nil { |
| 137 | r.descsByName[name] = &packageDescriptor{} |
| 138 | } |
| 139 | } |
| 140 | p := r.descsByName[file.Package()].(*packageDescriptor) |
| 141 | p.files = append(p.files, file) |
| 142 | rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) { |
| 143 | r.descsByName[d.FullName()] = d |
| 144 | }) |
| 145 | r.filesByPath[path] = file |
| 146 | return nil |
| 147 | } |
| 148 | |
| 149 | // FindDescriptorByName looks up a descriptor by the full name. |
| 150 | // |
| 151 | // This returns (nil, NotFound) if not found. |
| 152 | func (r *Files) FindDescriptorByName(name protoreflect.FullName) (protoreflect.Descriptor, error) { |
| 153 | if r == nil { |
| 154 | return nil, NotFound |
| 155 | } |
| 156 | if r == GlobalFiles { |
| 157 | globalMutex.RLock() |
| 158 | defer globalMutex.RUnlock() |
| 159 | } |
| 160 | prefix := name |
| 161 | suffix := nameSuffix("") |
| 162 | for prefix != "" { |
| 163 | if d, ok := r.descsByName[prefix]; ok { |
| 164 | switch d := d.(type) { |
| 165 | case protoreflect.EnumDescriptor: |
| 166 | if d.FullName() == name { |
| 167 | return d, nil |
| 168 | } |
| 169 | case protoreflect.EnumValueDescriptor: |
| 170 | if d.FullName() == name { |
| 171 | return d, nil |
| 172 | } |
| 173 | case protoreflect.MessageDescriptor: |
| 174 | if d.FullName() == name { |
| 175 | return d, nil |
| 176 | } |
| 177 | if d := findDescriptorInMessage(d, suffix); d != nil && d.FullName() == name { |
| 178 | return d, nil |
| 179 | } |
| 180 | case protoreflect.ExtensionDescriptor: |
| 181 | if d.FullName() == name { |
| 182 | return d, nil |
| 183 | } |
| 184 | case protoreflect.ServiceDescriptor: |
| 185 | if d.FullName() == name { |
| 186 | return d, nil |
| 187 | } |
| 188 | if d := d.Methods().ByName(suffix.Pop()); d != nil && d.FullName() == name { |
| 189 | return d, nil |
| 190 | } |
| 191 | } |
| 192 | return nil, NotFound |
| 193 | } |
| 194 | prefix = prefix.Parent() |
| 195 | suffix = nameSuffix(name[len(prefix)+len("."):]) |
| 196 | } |
| 197 | return nil, NotFound |
| 198 | } |
| 199 | |
| 200 | func findDescriptorInMessage(md protoreflect.MessageDescriptor, suffix nameSuffix) protoreflect.Descriptor { |
| 201 | name := suffix.Pop() |
| 202 | if suffix == "" { |
| 203 | if ed := md.Enums().ByName(name); ed != nil { |
| 204 | return ed |
| 205 | } |
| 206 | for i := md.Enums().Len() - 1; i >= 0; i-- { |
| 207 | if vd := md.Enums().Get(i).Values().ByName(name); vd != nil { |
| 208 | return vd |
| 209 | } |
| 210 | } |
| 211 | if xd := md.Extensions().ByName(name); xd != nil { |
| 212 | return xd |
| 213 | } |
| 214 | if fd := md.Fields().ByName(name); fd != nil { |
| 215 | return fd |
| 216 | } |
| 217 | if od := md.Oneofs().ByName(name); od != nil { |
| 218 | return od |
| 219 | } |
| 220 | } |
| 221 | if md := md.Messages().ByName(name); md != nil { |
| 222 | if suffix == "" { |
| 223 | return md |
| 224 | } |
| 225 | return findDescriptorInMessage(md, suffix) |
| 226 | } |
| 227 | return nil |
| 228 | } |
| 229 | |
| 230 | type nameSuffix string |
| 231 | |
| 232 | func (s *nameSuffix) Pop() (name protoreflect.Name) { |
| 233 | if i := strings.IndexByte(string(*s), '.'); i >= 0 { |
| 234 | name, *s = protoreflect.Name((*s)[:i]), (*s)[i+1:] |
| 235 | } else { |
| 236 | name, *s = protoreflect.Name((*s)), "" |
| 237 | } |
| 238 | return name |
| 239 | } |
| 240 | |
| 241 | // FindFileByPath looks up a file by the path. |
| 242 | // |
| 243 | // This returns (nil, NotFound) if not found. |
| 244 | func (r *Files) FindFileByPath(path string) (protoreflect.FileDescriptor, error) { |
| 245 | if r == nil { |
| 246 | return nil, NotFound |
| 247 | } |
| 248 | if r == GlobalFiles { |
| 249 | globalMutex.RLock() |
| 250 | defer globalMutex.RUnlock() |
| 251 | } |
| 252 | if fd, ok := r.filesByPath[path]; ok { |
| 253 | return fd, nil |
| 254 | } |
| 255 | return nil, NotFound |
| 256 | } |
| 257 | |
| 258 | // NumFiles reports the number of registered files. |
| 259 | func (r *Files) NumFiles() int { |
| 260 | if r == nil { |
| 261 | return 0 |
| 262 | } |
| 263 | if r == GlobalFiles { |
| 264 | globalMutex.RLock() |
| 265 | defer globalMutex.RUnlock() |
| 266 | } |
| 267 | return len(r.filesByPath) |
| 268 | } |
| 269 | |
| 270 | // RangeFiles iterates over all registered files while f returns true. |
| 271 | // The iteration order is undefined. |
| 272 | func (r *Files) RangeFiles(f func(protoreflect.FileDescriptor) bool) { |
| 273 | if r == nil { |
| 274 | return |
| 275 | } |
| 276 | if r == GlobalFiles { |
| 277 | globalMutex.RLock() |
| 278 | defer globalMutex.RUnlock() |
| 279 | } |
| 280 | for _, file := range r.filesByPath { |
| 281 | if !f(file) { |
| 282 | return |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | // NumFilesByPackage reports the number of registered files in a proto package. |
| 288 | func (r *Files) NumFilesByPackage(name protoreflect.FullName) int { |
| 289 | if r == nil { |
| 290 | return 0 |
| 291 | } |
| 292 | if r == GlobalFiles { |
| 293 | globalMutex.RLock() |
| 294 | defer globalMutex.RUnlock() |
| 295 | } |
| 296 | p, ok := r.descsByName[name].(*packageDescriptor) |
| 297 | if !ok { |
| 298 | return 0 |
| 299 | } |
| 300 | return len(p.files) |
| 301 | } |
| 302 | |
| 303 | // RangeFilesByPackage iterates over all registered files in a given proto package |
| 304 | // while f returns true. The iteration order is undefined. |
| 305 | func (r *Files) RangeFilesByPackage(name protoreflect.FullName, f func(protoreflect.FileDescriptor) bool) { |
| 306 | if r == nil { |
| 307 | return |
| 308 | } |
| 309 | if r == GlobalFiles { |
| 310 | globalMutex.RLock() |
| 311 | defer globalMutex.RUnlock() |
| 312 | } |
| 313 | p, ok := r.descsByName[name].(*packageDescriptor) |
| 314 | if !ok { |
| 315 | return |
| 316 | } |
| 317 | for _, file := range p.files { |
| 318 | if !f(file) { |
| 319 | return |
| 320 | } |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | // rangeTopLevelDescriptors iterates over all top-level descriptors in a file |
| 325 | // which will be directly entered into the registry. |
| 326 | func rangeTopLevelDescriptors(fd protoreflect.FileDescriptor, f func(protoreflect.Descriptor)) { |
| 327 | eds := fd.Enums() |
| 328 | for i := eds.Len() - 1; i >= 0; i-- { |
| 329 | f(eds.Get(i)) |
| 330 | vds := eds.Get(i).Values() |
| 331 | for i := vds.Len() - 1; i >= 0; i-- { |
| 332 | f(vds.Get(i)) |
| 333 | } |
| 334 | } |
| 335 | mds := fd.Messages() |
| 336 | for i := mds.Len() - 1; i >= 0; i-- { |
| 337 | f(mds.Get(i)) |
| 338 | } |
| 339 | xds := fd.Extensions() |
| 340 | for i := xds.Len() - 1; i >= 0; i-- { |
| 341 | f(xds.Get(i)) |
| 342 | } |
| 343 | sds := fd.Services() |
| 344 | for i := sds.Len() - 1; i >= 0; i-- { |
| 345 | f(sds.Get(i)) |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | // MessageTypeResolver is an interface for looking up messages. |
| 350 | // |
| 351 | // A compliant implementation must deterministically return the same type |
| 352 | // if no error is encountered. |
| 353 | // |
| 354 | // The Types type implements this interface. |
| 355 | type MessageTypeResolver interface { |
| 356 | // FindMessageByName looks up a message by its full name. |
| 357 | // E.g., "google.protobuf.Any" |
| 358 | // |
| 359 | // This return (nil, NotFound) if not found. |
| 360 | FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) |
| 361 | |
| 362 | // FindMessageByURL looks up a message by a URL identifier. |
| 363 | // See documentation on google.protobuf.Any.type_url for the URL format. |
| 364 | // |
| 365 | // This returns (nil, NotFound) if not found. |
| 366 | FindMessageByURL(url string) (protoreflect.MessageType, error) |
| 367 | } |
| 368 | |
| 369 | // ExtensionTypeResolver is an interface for looking up extensions. |
| 370 | // |
| 371 | // A compliant implementation must deterministically return the same type |
| 372 | // if no error is encountered. |
| 373 | // |
| 374 | // The Types type implements this interface. |
| 375 | type ExtensionTypeResolver interface { |
| 376 | // FindExtensionByName looks up a extension field by the field's full name. |
| 377 | // Note that this is the full name of the field as determined by |
| 378 | // where the extension is declared and is unrelated to the full name of the |
| 379 | // message being extended. |
| 380 | // |
| 381 | // This returns (nil, NotFound) if not found. |
| 382 | FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) |
| 383 | |
| 384 | // FindExtensionByNumber looks up a extension field by the field number |
| 385 | // within some parent message, identified by full name. |
| 386 | // |
| 387 | // This returns (nil, NotFound) if not found. |
| 388 | FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) |
| 389 | } |
| 390 | |
| 391 | var ( |
| 392 | _ MessageTypeResolver = (*Types)(nil) |
| 393 | _ ExtensionTypeResolver = (*Types)(nil) |
| 394 | ) |
| 395 | |
| 396 | // Types is a registry for looking up or iterating over descriptor types. |
| 397 | // The Find and Range methods are safe for concurrent use. |
| 398 | type Types struct { |
| 399 | typesByName typesByName |
| 400 | extensionsByMessage extensionsByMessage |
| 401 | |
| 402 | numEnums int |
| 403 | numMessages int |
| 404 | numExtensions int |
| 405 | } |
| 406 | |
| 407 | type ( |
| 408 | typesByName map[protoreflect.FullName]interface{} |
| 409 | extensionsByMessage map[protoreflect.FullName]extensionsByNumber |
| 410 | extensionsByNumber map[protoreflect.FieldNumber]protoreflect.ExtensionType |
| 411 | ) |
| 412 | |
| 413 | // RegisterMessage registers the provided message type. |
| 414 | // |
| 415 | // If a naming conflict occurs, the type is not registered and an error is returned. |
| 416 | func (r *Types) RegisterMessage(mt protoreflect.MessageType) error { |
| 417 | // Under rare circumstances getting the descriptor might recursively |
| 418 | // examine the registry, so fetch it before locking. |
| 419 | md := mt.Descriptor() |
| 420 | |
| 421 | if r == GlobalTypes { |
| 422 | globalMutex.Lock() |
| 423 | defer globalMutex.Unlock() |
| 424 | } |
| 425 | |
| 426 | if err := r.register("message", md, mt); err != nil { |
| 427 | return err |
| 428 | } |
| 429 | r.numMessages++ |
| 430 | return nil |
| 431 | } |
| 432 | |
| 433 | // RegisterEnum registers the provided enum type. |
| 434 | // |
| 435 | // If a naming conflict occurs, the type is not registered and an error is returned. |
| 436 | func (r *Types) RegisterEnum(et protoreflect.EnumType) error { |
| 437 | // Under rare circumstances getting the descriptor might recursively |
| 438 | // examine the registry, so fetch it before locking. |
| 439 | ed := et.Descriptor() |
| 440 | |
| 441 | if r == GlobalTypes { |
| 442 | globalMutex.Lock() |
| 443 | defer globalMutex.Unlock() |
| 444 | } |
| 445 | |
| 446 | if err := r.register("enum", ed, et); err != nil { |
| 447 | return err |
| 448 | } |
| 449 | r.numEnums++ |
| 450 | return nil |
| 451 | } |
| 452 | |
| 453 | // RegisterExtension registers the provided extension type. |
| 454 | // |
| 455 | // If a naming conflict occurs, the type is not registered and an error is returned. |
| 456 | func (r *Types) RegisterExtension(xt protoreflect.ExtensionType) error { |
| 457 | // Under rare circumstances getting the descriptor might recursively |
| 458 | // examine the registry, so fetch it before locking. |
| 459 | // |
| 460 | // A known case where this can happen: Fetching the TypeDescriptor for a |
| 461 | // legacy ExtensionDesc can consult the global registry. |
| 462 | xd := xt.TypeDescriptor() |
| 463 | |
| 464 | if r == GlobalTypes { |
| 465 | globalMutex.Lock() |
| 466 | defer globalMutex.Unlock() |
| 467 | } |
| 468 | |
| 469 | field := xd.Number() |
| 470 | message := xd.ContainingMessage().FullName() |
| 471 | if prev := r.extensionsByMessage[message][field]; prev != nil { |
| 472 | err := errors.New("extension number %d is already registered on message %v", field, message) |
| 473 | err = amendErrorWithCaller(err, prev, xt) |
| 474 | if !(r == GlobalTypes && ignoreConflict(xd, err)) { |
| 475 | return err |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | if err := r.register("extension", xd, xt); err != nil { |
| 480 | return err |
| 481 | } |
| 482 | if r.extensionsByMessage == nil { |
| 483 | r.extensionsByMessage = make(extensionsByMessage) |
| 484 | } |
| 485 | if r.extensionsByMessage[message] == nil { |
| 486 | r.extensionsByMessage[message] = make(extensionsByNumber) |
| 487 | } |
| 488 | r.extensionsByMessage[message][field] = xt |
| 489 | r.numExtensions++ |
| 490 | return nil |
| 491 | } |
| 492 | |
| 493 | func (r *Types) register(kind string, desc protoreflect.Descriptor, typ interface{}) error { |
| 494 | name := desc.FullName() |
| 495 | prev := r.typesByName[name] |
| 496 | if prev != nil { |
| 497 | err := errors.New("%v %v is already registered", kind, name) |
| 498 | err = amendErrorWithCaller(err, prev, typ) |
| 499 | if !(r == GlobalTypes && ignoreConflict(desc, err)) { |
| 500 | return err |
| 501 | } |
| 502 | } |
| 503 | if r.typesByName == nil { |
| 504 | r.typesByName = make(typesByName) |
| 505 | } |
| 506 | r.typesByName[name] = typ |
| 507 | return nil |
| 508 | } |
| 509 | |
| 510 | // FindEnumByName looks up an enum by its full name. |
| 511 | // E.g., "google.protobuf.Field.Kind". |
| 512 | // |
| 513 | // This returns (nil, NotFound) if not found. |
| 514 | func (r *Types) FindEnumByName(enum protoreflect.FullName) (protoreflect.EnumType, error) { |
| 515 | if r == nil { |
| 516 | return nil, NotFound |
| 517 | } |
| 518 | if r == GlobalTypes { |
| 519 | globalMutex.RLock() |
| 520 | defer globalMutex.RUnlock() |
| 521 | } |
| 522 | if v := r.typesByName[enum]; v != nil { |
| 523 | if et, _ := v.(protoreflect.EnumType); et != nil { |
| 524 | return et, nil |
| 525 | } |
| 526 | return nil, errors.New("found wrong type: got %v, want enum", typeName(v)) |
| 527 | } |
| 528 | return nil, NotFound |
| 529 | } |
| 530 | |
| 531 | // FindMessageByName looks up a message by its full name. |
| 532 | // E.g., "google.protobuf.Any" |
| 533 | // |
| 534 | // This return (nil, NotFound) if not found. |
| 535 | func (r *Types) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) { |
| 536 | // The full name by itself is a valid URL. |
| 537 | return r.FindMessageByURL(string(message)) |
| 538 | } |
| 539 | |
| 540 | // FindMessageByURL looks up a message by a URL identifier. |
| 541 | // See documentation on google.protobuf.Any.type_url for the URL format. |
| 542 | // |
| 543 | // This returns (nil, NotFound) if not found. |
| 544 | func (r *Types) FindMessageByURL(url string) (protoreflect.MessageType, error) { |
| 545 | if r == nil { |
| 546 | return nil, NotFound |
| 547 | } |
| 548 | if r == GlobalTypes { |
| 549 | globalMutex.RLock() |
| 550 | defer globalMutex.RUnlock() |
| 551 | } |
| 552 | message := protoreflect.FullName(url) |
| 553 | if i := strings.LastIndexByte(url, '/'); i >= 0 { |
| 554 | message = message[i+len("/"):] |
| 555 | } |
| 556 | |
| 557 | if v := r.typesByName[message]; v != nil { |
| 558 | if mt, _ := v.(protoreflect.MessageType); mt != nil { |
| 559 | return mt, nil |
| 560 | } |
| 561 | return nil, errors.New("found wrong type: got %v, want message", typeName(v)) |
| 562 | } |
| 563 | return nil, NotFound |
| 564 | } |
| 565 | |
| 566 | // FindExtensionByName looks up a extension field by the field's full name. |
| 567 | // Note that this is the full name of the field as determined by |
| 568 | // where the extension is declared and is unrelated to the full name of the |
| 569 | // message being extended. |
| 570 | // |
| 571 | // This returns (nil, NotFound) if not found. |
| 572 | func (r *Types) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) { |
| 573 | if r == nil { |
| 574 | return nil, NotFound |
| 575 | } |
| 576 | if r == GlobalTypes { |
| 577 | globalMutex.RLock() |
| 578 | defer globalMutex.RUnlock() |
| 579 | } |
| 580 | if v := r.typesByName[field]; v != nil { |
| 581 | if xt, _ := v.(protoreflect.ExtensionType); xt != nil { |
| 582 | return xt, nil |
| 583 | } |
| 584 | return nil, errors.New("found wrong type: got %v, want extension", typeName(v)) |
| 585 | } |
| 586 | return nil, NotFound |
| 587 | } |
| 588 | |
| 589 | // FindExtensionByNumber looks up a extension field by the field number |
| 590 | // within some parent message, identified by full name. |
| 591 | // |
| 592 | // This returns (nil, NotFound) if not found. |
| 593 | func (r *Types) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) { |
| 594 | if r == nil { |
| 595 | return nil, NotFound |
| 596 | } |
| 597 | if r == GlobalTypes { |
| 598 | globalMutex.RLock() |
| 599 | defer globalMutex.RUnlock() |
| 600 | } |
| 601 | if xt, ok := r.extensionsByMessage[message][field]; ok { |
| 602 | return xt, nil |
| 603 | } |
| 604 | return nil, NotFound |
| 605 | } |
| 606 | |
| 607 | // NumEnums reports the number of registered enums. |
| 608 | func (r *Types) NumEnums() int { |
| 609 | if r == nil { |
| 610 | return 0 |
| 611 | } |
| 612 | if r == GlobalTypes { |
| 613 | globalMutex.RLock() |
| 614 | defer globalMutex.RUnlock() |
| 615 | } |
| 616 | return r.numEnums |
| 617 | } |
| 618 | |
| 619 | // RangeEnums iterates over all registered enums while f returns true. |
| 620 | // Iteration order is undefined. |
| 621 | func (r *Types) RangeEnums(f func(protoreflect.EnumType) bool) { |
| 622 | if r == nil { |
| 623 | return |
| 624 | } |
| 625 | if r == GlobalTypes { |
| 626 | globalMutex.RLock() |
| 627 | defer globalMutex.RUnlock() |
| 628 | } |
| 629 | for _, typ := range r.typesByName { |
| 630 | if et, ok := typ.(protoreflect.EnumType); ok { |
| 631 | if !f(et) { |
| 632 | return |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | // NumMessages reports the number of registered messages. |
| 639 | func (r *Types) NumMessages() int { |
| 640 | if r == nil { |
| 641 | return 0 |
| 642 | } |
| 643 | if r == GlobalTypes { |
| 644 | globalMutex.RLock() |
| 645 | defer globalMutex.RUnlock() |
| 646 | } |
| 647 | return r.numMessages |
| 648 | } |
| 649 | |
| 650 | // RangeMessages iterates over all registered messages while f returns true. |
| 651 | // Iteration order is undefined. |
| 652 | func (r *Types) RangeMessages(f func(protoreflect.MessageType) bool) { |
| 653 | if r == nil { |
| 654 | return |
| 655 | } |
| 656 | if r == GlobalTypes { |
| 657 | globalMutex.RLock() |
| 658 | defer globalMutex.RUnlock() |
| 659 | } |
| 660 | for _, typ := range r.typesByName { |
| 661 | if mt, ok := typ.(protoreflect.MessageType); ok { |
| 662 | if !f(mt) { |
| 663 | return |
| 664 | } |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | // NumExtensions reports the number of registered extensions. |
| 670 | func (r *Types) NumExtensions() int { |
| 671 | if r == nil { |
| 672 | return 0 |
| 673 | } |
| 674 | if r == GlobalTypes { |
| 675 | globalMutex.RLock() |
| 676 | defer globalMutex.RUnlock() |
| 677 | } |
| 678 | return r.numExtensions |
| 679 | } |
| 680 | |
| 681 | // RangeExtensions iterates over all registered extensions while f returns true. |
| 682 | // Iteration order is undefined. |
| 683 | func (r *Types) RangeExtensions(f func(protoreflect.ExtensionType) bool) { |
| 684 | if r == nil { |
| 685 | return |
| 686 | } |
| 687 | if r == GlobalTypes { |
| 688 | globalMutex.RLock() |
| 689 | defer globalMutex.RUnlock() |
| 690 | } |
| 691 | for _, typ := range r.typesByName { |
| 692 | if xt, ok := typ.(protoreflect.ExtensionType); ok { |
| 693 | if !f(xt) { |
| 694 | return |
| 695 | } |
| 696 | } |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | // NumExtensionsByMessage reports the number of registered extensions for |
| 701 | // a given message type. |
| 702 | func (r *Types) NumExtensionsByMessage(message protoreflect.FullName) int { |
| 703 | if r == nil { |
| 704 | return 0 |
| 705 | } |
| 706 | if r == GlobalTypes { |
| 707 | globalMutex.RLock() |
| 708 | defer globalMutex.RUnlock() |
| 709 | } |
| 710 | return len(r.extensionsByMessage[message]) |
| 711 | } |
| 712 | |
| 713 | // RangeExtensionsByMessage iterates over all registered extensions filtered |
| 714 | // by a given message type while f returns true. Iteration order is undefined. |
| 715 | func (r *Types) RangeExtensionsByMessage(message protoreflect.FullName, f func(protoreflect.ExtensionType) bool) { |
| 716 | if r == nil { |
| 717 | return |
| 718 | } |
| 719 | if r == GlobalTypes { |
| 720 | globalMutex.RLock() |
| 721 | defer globalMutex.RUnlock() |
| 722 | } |
| 723 | for _, xt := range r.extensionsByMessage[message] { |
| 724 | if !f(xt) { |
| 725 | return |
| 726 | } |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | func typeName(t interface{}) string { |
| 731 | switch t.(type) { |
| 732 | case protoreflect.EnumType: |
| 733 | return "enum" |
| 734 | case protoreflect.MessageType: |
| 735 | return "message" |
| 736 | case protoreflect.ExtensionType: |
| 737 | return "extension" |
| 738 | default: |
| 739 | return fmt.Sprintf("%T", t) |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | func amendErrorWithCaller(err error, prev, curr interface{}) error { |
| 744 | prevPkg := goPackage(prev) |
| 745 | currPkg := goPackage(curr) |
| 746 | if prevPkg == "" || currPkg == "" || prevPkg == currPkg { |
| 747 | return err |
| 748 | } |
| 749 | return errors.New("%s\n\tpreviously from: %q\n\tcurrently from: %q", err, prevPkg, currPkg) |
| 750 | } |
| 751 | |
| 752 | func goPackage(v interface{}) string { |
| 753 | switch d := v.(type) { |
| 754 | case protoreflect.EnumType: |
| 755 | v = d.Descriptor() |
| 756 | case protoreflect.MessageType: |
| 757 | v = d.Descriptor() |
| 758 | case protoreflect.ExtensionType: |
| 759 | v = d.TypeDescriptor() |
| 760 | } |
| 761 | if d, ok := v.(protoreflect.Descriptor); ok { |
| 762 | v = d.ParentFile() |
| 763 | } |
| 764 | if d, ok := v.(interface{ GoPackagePath() string }); ok { |
| 765 | return d.GoPackagePath() |
| 766 | } |
| 767 | return "" |
| 768 | } |