Scott Baker | 1fe7273 | 2019-10-21 10:58:51 -0700 | [diff] [blame] | 1 | package dynamic |
| 2 | |
| 3 | // JSON marshalling and unmarshalling for dynamic messages |
| 4 | |
| 5 | import ( |
| 6 | "bytes" |
| 7 | "encoding/base64" |
| 8 | "encoding/json" |
| 9 | "fmt" |
| 10 | "io" |
| 11 | "io/ioutil" |
| 12 | "math" |
| 13 | "reflect" |
| 14 | "sort" |
| 15 | "strconv" |
| 16 | "strings" |
| 17 | |
| 18 | "github.com/golang/protobuf/jsonpb" |
| 19 | "github.com/golang/protobuf/proto" |
| 20 | "github.com/golang/protobuf/protoc-gen-go/descriptor" |
| 21 | // link in the well-known-types that have a special JSON format |
| 22 | _ "github.com/golang/protobuf/ptypes/any" |
| 23 | _ "github.com/golang/protobuf/ptypes/duration" |
| 24 | _ "github.com/golang/protobuf/ptypes/empty" |
| 25 | _ "github.com/golang/protobuf/ptypes/struct" |
| 26 | _ "github.com/golang/protobuf/ptypes/timestamp" |
| 27 | _ "github.com/golang/protobuf/ptypes/wrappers" |
| 28 | |
| 29 | "github.com/jhump/protoreflect/desc" |
| 30 | ) |
| 31 | |
| 32 | var wellKnownTypeNames = map[string]struct{}{ |
| 33 | "google.protobuf.Any": {}, |
| 34 | "google.protobuf.Empty": {}, |
| 35 | "google.protobuf.Duration": {}, |
| 36 | "google.protobuf.Timestamp": {}, |
| 37 | // struct.proto |
| 38 | "google.protobuf.Struct": {}, |
| 39 | "google.protobuf.Value": {}, |
| 40 | "google.protobuf.ListValue": {}, |
| 41 | // wrappers.proto |
| 42 | "google.protobuf.DoubleValue": {}, |
| 43 | "google.protobuf.FloatValue": {}, |
| 44 | "google.protobuf.Int64Value": {}, |
| 45 | "google.protobuf.UInt64Value": {}, |
| 46 | "google.protobuf.Int32Value": {}, |
| 47 | "google.protobuf.UInt32Value": {}, |
| 48 | "google.protobuf.BoolValue": {}, |
| 49 | "google.protobuf.StringValue": {}, |
| 50 | "google.protobuf.BytesValue": {}, |
| 51 | } |
| 52 | |
| 53 | // MarshalJSON serializes this message to bytes in JSON format, returning an |
| 54 | // error if the operation fails. The resulting bytes will be a valid UTF8 |
| 55 | // string. |
| 56 | // |
| 57 | // This method uses a compact form: no newlines, and spaces between fields and |
| 58 | // between field identifiers and values are elided. |
| 59 | // |
| 60 | // This method is convenient shorthand for invoking MarshalJSONPB with a default |
| 61 | // (zero value) marshaler: |
| 62 | // |
| 63 | // m.MarshalJSONPB(&jsonpb.Marshaler{}) |
| 64 | // |
| 65 | // So enums are serialized using enum value name strings, and values that are |
| 66 | // not present (including those with default/zero value for messages defined in |
| 67 | // "proto3" syntax) are omitted. |
| 68 | func (m *Message) MarshalJSON() ([]byte, error) { |
| 69 | return m.MarshalJSONPB(&jsonpb.Marshaler{}) |
| 70 | } |
| 71 | |
| 72 | // MarshalJSONIndent serializes this message to bytes in JSON format, returning |
| 73 | // an error if the operation fails. The resulting bytes will be a valid UTF8 |
| 74 | // string. |
| 75 | // |
| 76 | // This method uses a "pretty-printed" form, with each field on its own line and |
| 77 | // spaces between field identifiers and values. Indentation of two spaces is |
| 78 | // used. |
| 79 | // |
| 80 | // This method is convenient shorthand for invoking MarshalJSONPB with a default |
| 81 | // (zero value) marshaler: |
| 82 | // |
| 83 | // m.MarshalJSONPB(&jsonpb.Marshaler{Indent: " "}) |
| 84 | // |
| 85 | // So enums are serialized using enum value name strings, and values that are |
| 86 | // not present (including those with default/zero value for messages defined in |
| 87 | // "proto3" syntax) are omitted. |
| 88 | func (m *Message) MarshalJSONIndent() ([]byte, error) { |
| 89 | return m.MarshalJSONPB(&jsonpb.Marshaler{Indent: " "}) |
| 90 | } |
| 91 | |
| 92 | // MarshalJSONPB serializes this message to bytes in JSON format, returning an |
| 93 | // error if the operation fails. The resulting bytes will be a valid UTF8 |
| 94 | // string. The given marshaler is used to convey options used during marshaling. |
| 95 | // |
| 96 | // If this message contains nested messages that are generated message types (as |
| 97 | // opposed to dynamic messages), the given marshaler is used to marshal it. |
| 98 | // |
| 99 | // When marshaling any nested messages, any jsonpb.AnyResolver configured in the |
| 100 | // given marshaler is augmented with knowledge of message types known to this |
| 101 | // message's descriptor (and its enclosing file and set of transitive |
| 102 | // dependencies). |
| 103 | func (m *Message) MarshalJSONPB(opts *jsonpb.Marshaler) ([]byte, error) { |
| 104 | var b indentBuffer |
| 105 | b.indent = opts.Indent |
| 106 | if len(opts.Indent) == 0 { |
| 107 | b.indentCount = -1 |
| 108 | } |
| 109 | b.comma = true |
| 110 | if err := m.marshalJSON(&b, opts); err != nil { |
| 111 | return nil, err |
| 112 | } |
| 113 | return b.Bytes(), nil |
| 114 | } |
| 115 | |
| 116 | func (m *Message) marshalJSON(b *indentBuffer, opts *jsonpb.Marshaler) error { |
| 117 | if r, changed := wrapResolver(opts.AnyResolver, m.mf, m.md.GetFile()); changed { |
| 118 | newOpts := *opts |
| 119 | newOpts.AnyResolver = r |
| 120 | opts = &newOpts |
| 121 | } |
| 122 | |
| 123 | if ok, err := marshalWellKnownType(m, b, opts); ok { |
| 124 | return err |
| 125 | } |
| 126 | |
| 127 | err := b.WriteByte('{') |
| 128 | if err != nil { |
| 129 | return err |
| 130 | } |
| 131 | err = b.start() |
| 132 | if err != nil { |
| 133 | return err |
| 134 | } |
| 135 | |
| 136 | var tags []int |
| 137 | if opts.EmitDefaults { |
| 138 | tags = m.allKnownFieldTags() |
| 139 | } else { |
| 140 | tags = m.knownFieldTags() |
| 141 | } |
| 142 | |
| 143 | first := true |
| 144 | |
| 145 | for _, tag := range tags { |
| 146 | itag := int32(tag) |
| 147 | fd := m.FindFieldDescriptor(itag) |
| 148 | |
| 149 | v, ok := m.values[itag] |
| 150 | if !ok { |
| 151 | if fd.GetOneOf() != nil { |
| 152 | // don't print defaults for fields in a oneof |
| 153 | continue |
| 154 | } |
| 155 | v = fd.GetDefaultValue() |
| 156 | } |
| 157 | |
| 158 | err := b.maybeNext(&first) |
| 159 | if err != nil { |
| 160 | return err |
| 161 | } |
| 162 | err = marshalKnownFieldJSON(b, fd, v, opts) |
| 163 | if err != nil { |
| 164 | return err |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | err = b.end() |
| 169 | if err != nil { |
| 170 | return err |
| 171 | } |
| 172 | err = b.WriteByte('}') |
| 173 | if err != nil { |
| 174 | return err |
| 175 | } |
| 176 | |
| 177 | return nil |
| 178 | } |
| 179 | |
| 180 | func marshalWellKnownType(m *Message, b *indentBuffer, opts *jsonpb.Marshaler) (bool, error) { |
| 181 | fqn := m.md.GetFullyQualifiedName() |
| 182 | if _, ok := wellKnownTypeNames[fqn]; !ok { |
| 183 | return false, nil |
| 184 | } |
| 185 | |
| 186 | msgType := proto.MessageType(fqn) |
| 187 | if msgType == nil { |
| 188 | // wtf? |
| 189 | panic(fmt.Sprintf("could not find registered message type for %q", fqn)) |
| 190 | } |
| 191 | |
| 192 | // convert dynamic message to well-known type and let jsonpb marshal it |
| 193 | msg := reflect.New(msgType.Elem()).Interface().(proto.Message) |
| 194 | if err := m.MergeInto(msg); err != nil { |
| 195 | return true, err |
| 196 | } |
| 197 | return true, opts.Marshal(b, msg) |
| 198 | } |
| 199 | |
| 200 | func marshalKnownFieldJSON(b *indentBuffer, fd *desc.FieldDescriptor, v interface{}, opts *jsonpb.Marshaler) error { |
| 201 | var jsonName string |
| 202 | if opts.OrigName { |
| 203 | jsonName = fd.GetName() |
| 204 | } else { |
| 205 | jsonName = fd.AsFieldDescriptorProto().GetJsonName() |
| 206 | if jsonName == "" { |
| 207 | jsonName = fd.GetName() |
| 208 | } |
| 209 | } |
| 210 | if fd.IsExtension() { |
| 211 | var scope string |
| 212 | switch parent := fd.GetParent().(type) { |
| 213 | case *desc.FileDescriptor: |
| 214 | scope = parent.GetPackage() |
| 215 | default: |
| 216 | scope = parent.GetFullyQualifiedName() |
| 217 | } |
| 218 | if scope == "" { |
| 219 | jsonName = fmt.Sprintf("[%s]", jsonName) |
| 220 | } else { |
| 221 | jsonName = fmt.Sprintf("[%s.%s]", scope, jsonName) |
| 222 | } |
| 223 | } |
| 224 | err := writeJsonString(b, jsonName) |
| 225 | if err != nil { |
| 226 | return err |
| 227 | } |
| 228 | err = b.sep() |
| 229 | if err != nil { |
| 230 | return err |
| 231 | } |
| 232 | |
| 233 | if isNil(v) { |
| 234 | _, err := b.WriteString("null") |
| 235 | return err |
| 236 | } |
| 237 | |
| 238 | if fd.IsMap() { |
| 239 | err = b.WriteByte('{') |
| 240 | if err != nil { |
| 241 | return err |
| 242 | } |
| 243 | err = b.start() |
| 244 | if err != nil { |
| 245 | return err |
| 246 | } |
| 247 | |
| 248 | md := fd.GetMessageType() |
| 249 | vfd := md.FindFieldByNumber(2) |
| 250 | |
| 251 | mp := v.(map[interface{}]interface{}) |
| 252 | keys := make([]interface{}, 0, len(mp)) |
| 253 | for k := range mp { |
| 254 | keys = append(keys, k) |
| 255 | } |
| 256 | sort.Sort(sortable(keys)) |
| 257 | first := true |
| 258 | for _, mk := range keys { |
| 259 | mv := mp[mk] |
| 260 | err := b.maybeNext(&first) |
| 261 | if err != nil { |
| 262 | return err |
| 263 | } |
| 264 | |
| 265 | err = marshalKnownFieldMapEntryJSON(b, mk, vfd, mv, opts) |
| 266 | if err != nil { |
| 267 | return err |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | err = b.end() |
| 272 | if err != nil { |
| 273 | return err |
| 274 | } |
| 275 | return b.WriteByte('}') |
| 276 | |
| 277 | } else if fd.IsRepeated() { |
| 278 | err = b.WriteByte('[') |
| 279 | if err != nil { |
| 280 | return err |
| 281 | } |
| 282 | err = b.start() |
| 283 | if err != nil { |
| 284 | return err |
| 285 | } |
| 286 | |
| 287 | sl := v.([]interface{}) |
| 288 | first := true |
| 289 | for _, slv := range sl { |
| 290 | err := b.maybeNext(&first) |
| 291 | if err != nil { |
| 292 | return err |
| 293 | } |
| 294 | err = marshalKnownFieldValueJSON(b, fd, slv, opts) |
| 295 | if err != nil { |
| 296 | return err |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | err = b.end() |
| 301 | if err != nil { |
| 302 | return err |
| 303 | } |
| 304 | return b.WriteByte(']') |
| 305 | |
| 306 | } else { |
| 307 | return marshalKnownFieldValueJSON(b, fd, v, opts) |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | // sortable is used to sort map keys. Values will be integers (int32, int64, uint32, and uint64), |
| 312 | // bools, or strings. |
| 313 | type sortable []interface{} |
| 314 | |
| 315 | func (s sortable) Len() int { |
| 316 | return len(s) |
| 317 | } |
| 318 | |
| 319 | func (s sortable) Less(i, j int) bool { |
| 320 | vi := s[i] |
| 321 | vj := s[j] |
| 322 | switch reflect.TypeOf(vi).Kind() { |
| 323 | case reflect.Int32: |
| 324 | return vi.(int32) < vj.(int32) |
| 325 | case reflect.Int64: |
| 326 | return vi.(int64) < vj.(int64) |
| 327 | case reflect.Uint32: |
| 328 | return vi.(uint32) < vj.(uint32) |
| 329 | case reflect.Uint64: |
| 330 | return vi.(uint64) < vj.(uint64) |
| 331 | case reflect.String: |
| 332 | return vi.(string) < vj.(string) |
| 333 | case reflect.Bool: |
| 334 | return !vi.(bool) && vj.(bool) |
| 335 | default: |
| 336 | panic(fmt.Sprintf("cannot compare keys of type %v", reflect.TypeOf(vi))) |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | func (s sortable) Swap(i, j int) { |
| 341 | s[i], s[j] = s[j], s[i] |
| 342 | } |
| 343 | |
| 344 | func isNil(v interface{}) bool { |
| 345 | if v == nil { |
| 346 | return true |
| 347 | } |
| 348 | rv := reflect.ValueOf(v) |
| 349 | return rv.Kind() == reflect.Ptr && rv.IsNil() |
| 350 | } |
| 351 | |
| 352 | func marshalKnownFieldMapEntryJSON(b *indentBuffer, mk interface{}, vfd *desc.FieldDescriptor, mv interface{}, opts *jsonpb.Marshaler) error { |
| 353 | rk := reflect.ValueOf(mk) |
| 354 | var strkey string |
| 355 | switch rk.Kind() { |
| 356 | case reflect.Bool: |
| 357 | strkey = strconv.FormatBool(rk.Bool()) |
| 358 | case reflect.Int32, reflect.Int64: |
| 359 | strkey = strconv.FormatInt(rk.Int(), 10) |
| 360 | case reflect.Uint32, reflect.Uint64: |
| 361 | strkey = strconv.FormatUint(rk.Uint(), 10) |
| 362 | case reflect.String: |
| 363 | strkey = rk.String() |
| 364 | default: |
| 365 | return fmt.Errorf("invalid map key value: %v (%v)", mk, rk.Type()) |
| 366 | } |
| 367 | err := writeString(b, strkey) |
| 368 | if err != nil { |
| 369 | return err |
| 370 | } |
| 371 | err = b.sep() |
| 372 | if err != nil { |
| 373 | return err |
| 374 | } |
| 375 | return marshalKnownFieldValueJSON(b, vfd, mv, opts) |
| 376 | } |
| 377 | |
| 378 | func marshalKnownFieldValueJSON(b *indentBuffer, fd *desc.FieldDescriptor, v interface{}, opts *jsonpb.Marshaler) error { |
| 379 | rv := reflect.ValueOf(v) |
| 380 | switch rv.Kind() { |
| 381 | case reflect.Int64: |
| 382 | return writeJsonString(b, strconv.FormatInt(rv.Int(), 10)) |
| 383 | case reflect.Int32: |
| 384 | ed := fd.GetEnumType() |
| 385 | if !opts.EnumsAsInts && ed != nil { |
| 386 | n := int32(rv.Int()) |
| 387 | vd := ed.FindValueByNumber(n) |
| 388 | if vd == nil { |
| 389 | _, err := b.WriteString(strconv.FormatInt(rv.Int(), 10)) |
| 390 | return err |
| 391 | } else { |
| 392 | return writeJsonString(b, vd.GetName()) |
| 393 | } |
| 394 | } else { |
| 395 | _, err := b.WriteString(strconv.FormatInt(rv.Int(), 10)) |
| 396 | return err |
| 397 | } |
| 398 | case reflect.Uint64: |
| 399 | return writeJsonString(b, strconv.FormatUint(rv.Uint(), 10)) |
| 400 | case reflect.Uint32: |
| 401 | _, err := b.WriteString(strconv.FormatUint(rv.Uint(), 10)) |
| 402 | return err |
| 403 | case reflect.Float32, reflect.Float64: |
| 404 | f := rv.Float() |
| 405 | var str string |
| 406 | if math.IsNaN(f) { |
| 407 | str = `"NaN"` |
| 408 | } else if math.IsInf(f, 1) { |
| 409 | str = `"Infinity"` |
| 410 | } else if math.IsInf(f, -1) { |
| 411 | str = `"-Infinity"` |
| 412 | } else { |
| 413 | var bits int |
| 414 | if rv.Kind() == reflect.Float32 { |
| 415 | bits = 32 |
| 416 | } else { |
| 417 | bits = 64 |
| 418 | } |
| 419 | str = strconv.FormatFloat(rv.Float(), 'g', -1, bits) |
| 420 | } |
| 421 | _, err := b.WriteString(str) |
| 422 | return err |
| 423 | case reflect.Bool: |
| 424 | _, err := b.WriteString(strconv.FormatBool(rv.Bool())) |
| 425 | return err |
| 426 | case reflect.Slice: |
| 427 | bstr := base64.StdEncoding.EncodeToString(rv.Bytes()) |
| 428 | return writeJsonString(b, bstr) |
| 429 | case reflect.String: |
| 430 | return writeJsonString(b, rv.String()) |
| 431 | default: |
| 432 | // must be a message |
| 433 | if dm, ok := v.(*Message); ok { |
| 434 | return dm.marshalJSON(b, opts) |
| 435 | } else { |
| 436 | var err error |
| 437 | if b.indentCount <= 0 || len(b.indent) == 0 { |
| 438 | err = opts.Marshal(b, v.(proto.Message)) |
| 439 | } else { |
| 440 | str, err := opts.MarshalToString(v.(proto.Message)) |
| 441 | if err != nil { |
| 442 | return err |
| 443 | } |
| 444 | indent := strings.Repeat(b.indent, b.indentCount) |
| 445 | pos := 0 |
| 446 | // add indention prefix to each line |
| 447 | for pos < len(str) { |
| 448 | start := pos |
| 449 | nextPos := strings.Index(str[pos:], "\n") |
| 450 | if nextPos == -1 { |
| 451 | nextPos = len(str) |
| 452 | } else { |
| 453 | nextPos = pos + nextPos + 1 // include newline |
| 454 | } |
| 455 | line := str[start:nextPos] |
| 456 | if pos > 0 { |
| 457 | _, err = b.WriteString(indent) |
| 458 | if err != nil { |
| 459 | return err |
| 460 | } |
| 461 | } |
| 462 | _, err = b.WriteString(line) |
| 463 | if err != nil { |
| 464 | return err |
| 465 | } |
| 466 | pos = nextPos |
| 467 | } |
| 468 | } |
| 469 | return err |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | func writeJsonString(b *indentBuffer, s string) error { |
| 475 | if sbytes, err := json.Marshal(s); err != nil { |
| 476 | return err |
| 477 | } else { |
| 478 | _, err := b.Write(sbytes) |
| 479 | return err |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | // UnmarshalJSON de-serializes the message that is present, in JSON format, in |
| 484 | // the given bytes into this message. It first resets the current message. It |
| 485 | // returns an error if the given bytes do not contain a valid encoding of this |
| 486 | // message type in JSON format. |
| 487 | // |
| 488 | // This method is shorthand for invoking UnmarshalJSONPB with a default (zero |
| 489 | // value) unmarshaler: |
| 490 | // |
| 491 | // m.UnmarshalMergeJSONPB(&jsonpb.Unmarshaler{}, js) |
| 492 | // |
| 493 | // So unknown fields will result in an error, and no provided jsonpb.AnyResolver |
| 494 | // will be used when parsing google.protobuf.Any messages. |
| 495 | func (m *Message) UnmarshalJSON(js []byte) error { |
| 496 | return m.UnmarshalJSONPB(&jsonpb.Unmarshaler{}, js) |
| 497 | } |
| 498 | |
| 499 | // UnmarshalMergeJSON de-serializes the message that is present, in JSON format, |
| 500 | // in the given bytes into this message. Unlike UnmarshalJSON, it does not first |
| 501 | // reset the message, instead merging the data in the given bytes into the |
| 502 | // existing data in this message. |
| 503 | func (m *Message) UnmarshalMergeJSON(js []byte) error { |
| 504 | return m.UnmarshalMergeJSONPB(&jsonpb.Unmarshaler{}, js) |
| 505 | } |
| 506 | |
| 507 | // UnmarshalJSONPB de-serializes the message that is present, in JSON format, in |
| 508 | // the given bytes into this message. The given unmarshaler conveys options used |
| 509 | // when parsing the JSON. This function first resets the current message. It |
| 510 | // returns an error if the given bytes do not contain a valid encoding of this |
| 511 | // message type in JSON format. |
| 512 | // |
| 513 | // The decoding is lenient: |
| 514 | // 1. The JSON can refer to fields either by their JSON name or by their |
| 515 | // declared name. |
| 516 | // 2. The JSON can use either numeric values or string names for enum values. |
| 517 | // |
| 518 | // When instantiating nested messages, if this message's associated factory |
| 519 | // returns a generated message type (as opposed to a dynamic message), the given |
| 520 | // unmarshaler is used to unmarshal it. |
| 521 | // |
| 522 | // When unmarshaling any nested messages, any jsonpb.AnyResolver configured in |
| 523 | // the given unmarshaler is augmented with knowledge of message types known to |
| 524 | // this message's descriptor (and its enclosing file and set of transitive |
| 525 | // dependencies). |
| 526 | func (m *Message) UnmarshalJSONPB(opts *jsonpb.Unmarshaler, js []byte) error { |
| 527 | m.Reset() |
| 528 | if err := m.UnmarshalMergeJSONPB(opts, js); err != nil { |
| 529 | return err |
| 530 | } |
| 531 | return m.Validate() |
| 532 | } |
| 533 | |
| 534 | // UnmarshalMergeJSONPB de-serializes the message that is present, in JSON |
| 535 | // format, in the given bytes into this message. The given unmarshaler conveys |
| 536 | // options used when parsing the JSON. Unlike UnmarshalJSONPB, it does not first |
| 537 | // reset the message, instead merging the data in the given bytes into the |
| 538 | // existing data in this message. |
| 539 | func (m *Message) UnmarshalMergeJSONPB(opts *jsonpb.Unmarshaler, js []byte) error { |
| 540 | r := newJsReader(js) |
| 541 | err := m.unmarshalJson(r, opts) |
| 542 | if err != nil { |
| 543 | return err |
| 544 | } |
| 545 | if t, err := r.poll(); err != io.EOF { |
| 546 | b, _ := ioutil.ReadAll(r.unread()) |
| 547 | s := fmt.Sprintf("%v%s", t, string(b)) |
| 548 | return fmt.Errorf("superfluous data found after JSON object: %q", s) |
| 549 | } |
| 550 | return nil |
| 551 | } |
| 552 | |
| 553 | func unmarshalWellKnownType(m *Message, r *jsReader, opts *jsonpb.Unmarshaler) (bool, error) { |
| 554 | fqn := m.md.GetFullyQualifiedName() |
| 555 | if _, ok := wellKnownTypeNames[fqn]; !ok { |
| 556 | return false, nil |
| 557 | } |
| 558 | |
| 559 | msgType := proto.MessageType(fqn) |
| 560 | if msgType == nil { |
| 561 | // wtf? |
| 562 | panic(fmt.Sprintf("could not find registered message type for %q", fqn)) |
| 563 | } |
| 564 | |
| 565 | // extract json value from r |
| 566 | var js json.RawMessage |
| 567 | if err := json.NewDecoder(r.unread()).Decode(&js); err != nil { |
| 568 | return true, err |
| 569 | } |
| 570 | if err := r.skip(); err != nil { |
| 571 | return true, err |
| 572 | } |
| 573 | |
| 574 | // unmarshal into well-known type and then convert to dynamic message |
| 575 | msg := reflect.New(msgType.Elem()).Interface().(proto.Message) |
| 576 | if err := opts.Unmarshal(bytes.NewReader(js), msg); err != nil { |
| 577 | return true, err |
| 578 | } |
| 579 | return true, m.MergeFrom(msg) |
| 580 | } |
| 581 | |
| 582 | func (m *Message) unmarshalJson(r *jsReader, opts *jsonpb.Unmarshaler) error { |
| 583 | if r, changed := wrapResolver(opts.AnyResolver, m.mf, m.md.GetFile()); changed { |
| 584 | newOpts := *opts |
| 585 | newOpts.AnyResolver = r |
| 586 | opts = &newOpts |
| 587 | } |
| 588 | |
| 589 | if ok, err := unmarshalWellKnownType(m, r, opts); ok { |
| 590 | return err |
| 591 | } |
| 592 | |
| 593 | t, err := r.peek() |
| 594 | if err != nil { |
| 595 | return err |
| 596 | } |
| 597 | if t == nil { |
| 598 | // if json is simply "null" we do nothing |
| 599 | r.poll() |
| 600 | return nil |
| 601 | } |
| 602 | |
| 603 | if err := r.beginObject(); err != nil { |
| 604 | return err |
| 605 | } |
| 606 | |
| 607 | for r.hasNext() { |
| 608 | f, err := r.nextObjectKey() |
| 609 | if err != nil { |
| 610 | return err |
| 611 | } |
| 612 | fd := m.FindFieldDescriptorByJSONName(f) |
| 613 | if fd == nil { |
| 614 | if opts.AllowUnknownFields { |
| 615 | r.skip() |
| 616 | continue |
| 617 | } |
| 618 | return fmt.Errorf("message type %s has no known field named %s", m.md.GetFullyQualifiedName(), f) |
| 619 | } |
| 620 | v, err := unmarshalJsField(fd, r, m.mf, opts) |
| 621 | if err != nil { |
| 622 | return err |
| 623 | } |
| 624 | if v != nil { |
| 625 | if err := mergeField(m, fd, v); err != nil { |
| 626 | return err |
| 627 | } |
| 628 | } else if fd.GetOneOf() != nil { |
| 629 | // preserve explicit null for oneof fields (this is a little odd but |
| 630 | // mimics the behavior of jsonpb with oneofs in generated message types) |
| 631 | if fd.GetMessageType() != nil { |
| 632 | typ := m.mf.GetKnownTypeRegistry().GetKnownType(fd.GetMessageType().GetFullyQualifiedName()) |
| 633 | if typ != nil { |
| 634 | // typed nil |
| 635 | if typ.Kind() != reflect.Ptr { |
| 636 | typ = reflect.PtrTo(typ) |
| 637 | } |
| 638 | v = reflect.Zero(typ).Interface() |
| 639 | } else { |
| 640 | // can't use nil dynamic message, so we just use empty one instead |
| 641 | v = m.mf.NewDynamicMessage(fd.GetMessageType()) |
| 642 | } |
| 643 | if err := m.setField(fd, v); err != nil { |
| 644 | return err |
| 645 | } |
| 646 | } else { |
| 647 | // not a message... explicit null makes no sense |
| 648 | return fmt.Errorf("message type %s cannot set field %s to null: it is not a message type", m.md.GetFullyQualifiedName(), f) |
| 649 | } |
| 650 | } else { |
| 651 | m.clearField(fd) |
| 652 | } |
| 653 | } |
| 654 | |
| 655 | if err := r.endObject(); err != nil { |
| 656 | return err |
| 657 | } |
| 658 | |
| 659 | return nil |
| 660 | } |
| 661 | |
| 662 | func isWellKnownValue(fd *desc.FieldDescriptor) bool { |
| 663 | return !fd.IsRepeated() && fd.GetType() == descriptor.FieldDescriptorProto_TYPE_MESSAGE && |
| 664 | fd.GetMessageType().GetFullyQualifiedName() == "google.protobuf.Value" |
| 665 | } |
| 666 | |
| 667 | func isWellKnownListValue(fd *desc.FieldDescriptor) bool { |
| 668 | return !fd.IsRepeated() && fd.GetType() == descriptor.FieldDescriptorProto_TYPE_MESSAGE && |
| 669 | fd.GetMessageType().GetFullyQualifiedName() == "google.protobuf.ListValue" |
| 670 | } |
| 671 | |
| 672 | func unmarshalJsField(fd *desc.FieldDescriptor, r *jsReader, mf *MessageFactory, opts *jsonpb.Unmarshaler) (interface{}, error) { |
| 673 | t, err := r.peek() |
| 674 | if err != nil { |
| 675 | return nil, err |
| 676 | } |
| 677 | if t == nil && !isWellKnownValue(fd) { |
| 678 | // if value is null, just return nil |
| 679 | // (unless field is google.protobuf.Value, in which case |
| 680 | // we fall through to parse it as an instance where its |
| 681 | // underlying value is set to a NullValue) |
| 682 | r.poll() |
| 683 | return nil, nil |
| 684 | } |
| 685 | |
| 686 | if t == json.Delim('{') && fd.IsMap() { |
| 687 | entryType := fd.GetMessageType() |
| 688 | keyType := entryType.FindFieldByNumber(1) |
| 689 | valueType := entryType.FindFieldByNumber(2) |
| 690 | mp := map[interface{}]interface{}{} |
| 691 | |
| 692 | // TODO: if there are just two map keys "key" and "value" and they have the right type of values, |
| 693 | // treat this JSON object as a single map entry message. (In keeping with support of map fields as |
| 694 | // if they were normal repeated field of entry messages as well as supporting a transition from |
| 695 | // optional to repeated...) |
| 696 | |
| 697 | if err := r.beginObject(); err != nil { |
| 698 | return nil, err |
| 699 | } |
| 700 | for r.hasNext() { |
| 701 | kk, err := unmarshalJsFieldElement(keyType, r, mf, opts) |
| 702 | if err != nil { |
| 703 | return nil, err |
| 704 | } |
| 705 | vv, err := unmarshalJsFieldElement(valueType, r, mf, opts) |
| 706 | if err != nil { |
| 707 | return nil, err |
| 708 | } |
| 709 | mp[kk] = vv |
| 710 | } |
| 711 | if err := r.endObject(); err != nil { |
| 712 | return nil, err |
| 713 | } |
| 714 | |
| 715 | return mp, nil |
| 716 | } else if t == json.Delim('[') && !isWellKnownListValue(fd) { |
| 717 | // We support parsing an array, even if field is not repeated, to mimic support in proto |
| 718 | // binary wire format that supports changing an optional field to repeated and vice versa. |
| 719 | // If the field is not repeated, we only keep the last value in the array. |
| 720 | |
| 721 | if err := r.beginArray(); err != nil { |
| 722 | return nil, err |
| 723 | } |
| 724 | var sl []interface{} |
| 725 | var v interface{} |
| 726 | for r.hasNext() { |
| 727 | var err error |
| 728 | v, err = unmarshalJsFieldElement(fd, r, mf, opts) |
| 729 | if err != nil { |
| 730 | return nil, err |
| 731 | } |
| 732 | if fd.IsRepeated() && v != nil { |
| 733 | sl = append(sl, v) |
| 734 | } |
| 735 | } |
| 736 | if err := r.endArray(); err != nil { |
| 737 | return nil, err |
| 738 | } |
| 739 | if fd.IsMap() { |
| 740 | mp := map[interface{}]interface{}{} |
| 741 | for _, m := range sl { |
| 742 | msg := m.(*Message) |
| 743 | kk, err := msg.TryGetFieldByNumber(1) |
| 744 | if err != nil { |
| 745 | return nil, err |
| 746 | } |
| 747 | vv, err := msg.TryGetFieldByNumber(2) |
| 748 | if err != nil { |
| 749 | return nil, err |
| 750 | } |
| 751 | mp[kk] = vv |
| 752 | } |
| 753 | return mp, nil |
| 754 | } else if fd.IsRepeated() { |
| 755 | return sl, nil |
| 756 | } else { |
| 757 | return v, nil |
| 758 | } |
| 759 | } else { |
| 760 | // We support parsing a singular value, even if field is repeated, to mimic support in proto |
| 761 | // binary wire format that supports changing an optional field to repeated and vice versa. |
| 762 | // If the field is repeated, we store value as singleton slice of that one value. |
| 763 | |
| 764 | v, err := unmarshalJsFieldElement(fd, r, mf, opts) |
| 765 | if err != nil { |
| 766 | return nil, err |
| 767 | } |
| 768 | if v == nil { |
| 769 | return nil, nil |
| 770 | } |
| 771 | if fd.IsRepeated() { |
| 772 | return []interface{}{v}, nil |
| 773 | } else { |
| 774 | return v, nil |
| 775 | } |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | func unmarshalJsFieldElement(fd *desc.FieldDescriptor, r *jsReader, mf *MessageFactory, opts *jsonpb.Unmarshaler) (interface{}, error) { |
| 780 | t, err := r.peek() |
| 781 | if err != nil { |
| 782 | return nil, err |
| 783 | } |
| 784 | |
| 785 | switch fd.GetType() { |
| 786 | case descriptor.FieldDescriptorProto_TYPE_MESSAGE, |
| 787 | descriptor.FieldDescriptorProto_TYPE_GROUP: |
| 788 | m := mf.NewMessage(fd.GetMessageType()) |
| 789 | if dm, ok := m.(*Message); ok { |
| 790 | if err := dm.unmarshalJson(r, opts); err != nil { |
| 791 | return nil, err |
| 792 | } |
| 793 | } else { |
| 794 | var msg json.RawMessage |
| 795 | if err := json.NewDecoder(r.unread()).Decode(&msg); err != nil { |
| 796 | return nil, err |
| 797 | } |
| 798 | if err := r.skip(); err != nil { |
| 799 | return nil, err |
| 800 | } |
| 801 | if err := opts.Unmarshal(bytes.NewReader([]byte(msg)), m); err != nil { |
| 802 | return nil, err |
| 803 | } |
| 804 | } |
| 805 | return m, nil |
| 806 | |
| 807 | case descriptor.FieldDescriptorProto_TYPE_ENUM: |
| 808 | if e, err := r.nextNumber(); err != nil { |
| 809 | return nil, err |
| 810 | } else { |
| 811 | // value could be string or number |
| 812 | if i, err := e.Int64(); err != nil { |
| 813 | // number cannot be parsed, so see if it's an enum value name |
| 814 | vd := fd.GetEnumType().FindValueByName(string(e)) |
| 815 | if vd != nil { |
| 816 | return vd.GetNumber(), nil |
| 817 | } else { |
| 818 | return nil, fmt.Errorf("enum %q does not have value named %q", fd.GetEnumType().GetFullyQualifiedName(), e) |
| 819 | } |
| 820 | } else if i > math.MaxInt32 || i < math.MinInt32 { |
| 821 | return nil, NumericOverflowError |
| 822 | } else { |
| 823 | return int32(i), err |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | case descriptor.FieldDescriptorProto_TYPE_INT32, |
| 828 | descriptor.FieldDescriptorProto_TYPE_SINT32, |
| 829 | descriptor.FieldDescriptorProto_TYPE_SFIXED32: |
| 830 | if i, err := r.nextInt(); err != nil { |
| 831 | return nil, err |
| 832 | } else if i > math.MaxInt32 || i < math.MinInt32 { |
| 833 | return nil, NumericOverflowError |
| 834 | } else { |
| 835 | return int32(i), err |
| 836 | } |
| 837 | |
| 838 | case descriptor.FieldDescriptorProto_TYPE_INT64, |
| 839 | descriptor.FieldDescriptorProto_TYPE_SINT64, |
| 840 | descriptor.FieldDescriptorProto_TYPE_SFIXED64: |
| 841 | return r.nextInt() |
| 842 | |
| 843 | case descriptor.FieldDescriptorProto_TYPE_UINT32, |
| 844 | descriptor.FieldDescriptorProto_TYPE_FIXED32: |
| 845 | if i, err := r.nextUint(); err != nil { |
| 846 | return nil, err |
| 847 | } else if i > math.MaxUint32 { |
| 848 | return nil, NumericOverflowError |
| 849 | } else { |
| 850 | return uint32(i), err |
| 851 | } |
| 852 | |
| 853 | case descriptor.FieldDescriptorProto_TYPE_UINT64, |
| 854 | descriptor.FieldDescriptorProto_TYPE_FIXED64: |
| 855 | return r.nextUint() |
| 856 | |
| 857 | case descriptor.FieldDescriptorProto_TYPE_BOOL: |
| 858 | if str, ok := t.(string); ok { |
| 859 | if str == "true" { |
| 860 | r.poll() // consume token |
| 861 | return true, err |
| 862 | } else if str == "false" { |
| 863 | r.poll() // consume token |
| 864 | return false, err |
| 865 | } |
| 866 | } |
| 867 | return r.nextBool() |
| 868 | |
| 869 | case descriptor.FieldDescriptorProto_TYPE_FLOAT: |
| 870 | if f, err := r.nextFloat(); err != nil { |
| 871 | return nil, err |
| 872 | } else { |
| 873 | return float32(f), nil |
| 874 | } |
| 875 | |
| 876 | case descriptor.FieldDescriptorProto_TYPE_DOUBLE: |
| 877 | return r.nextFloat() |
| 878 | |
| 879 | case descriptor.FieldDescriptorProto_TYPE_BYTES: |
| 880 | return r.nextBytes() |
| 881 | |
| 882 | case descriptor.FieldDescriptorProto_TYPE_STRING: |
| 883 | return r.nextString() |
| 884 | |
| 885 | default: |
| 886 | return nil, fmt.Errorf("unknown field type: %v", fd.GetType()) |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | type jsReader struct { |
| 891 | reader *bytes.Reader |
| 892 | dec *json.Decoder |
| 893 | current json.Token |
| 894 | peeked bool |
| 895 | } |
| 896 | |
| 897 | func newJsReader(b []byte) *jsReader { |
| 898 | reader := bytes.NewReader(b) |
| 899 | dec := json.NewDecoder(reader) |
| 900 | dec.UseNumber() |
| 901 | return &jsReader{reader: reader, dec: dec} |
| 902 | } |
| 903 | |
| 904 | func (r *jsReader) unread() io.Reader { |
| 905 | bufs := make([]io.Reader, 3) |
| 906 | var peeked []byte |
| 907 | if r.peeked { |
| 908 | if _, ok := r.current.(json.Delim); ok { |
| 909 | peeked = []byte(fmt.Sprintf("%v", r.current)) |
| 910 | } else { |
| 911 | peeked, _ = json.Marshal(r.current) |
| 912 | } |
| 913 | } |
| 914 | readerCopy := *r.reader |
| 915 | decCopy := *r.dec |
| 916 | |
| 917 | bufs[0] = bytes.NewReader(peeked) |
| 918 | bufs[1] = decCopy.Buffered() |
| 919 | bufs[2] = &readerCopy |
| 920 | return &concatReader{bufs: bufs} |
| 921 | } |
| 922 | |
| 923 | func (r *jsReader) hasNext() bool { |
| 924 | return r.dec.More() |
| 925 | } |
| 926 | |
| 927 | func (r *jsReader) peek() (json.Token, error) { |
| 928 | if r.peeked { |
| 929 | return r.current, nil |
| 930 | } |
| 931 | t, err := r.dec.Token() |
| 932 | if err != nil { |
| 933 | return nil, err |
| 934 | } |
| 935 | r.peeked = true |
| 936 | r.current = t |
| 937 | return t, nil |
| 938 | } |
| 939 | |
| 940 | func (r *jsReader) poll() (json.Token, error) { |
| 941 | if r.peeked { |
| 942 | ret := r.current |
| 943 | r.current = nil |
| 944 | r.peeked = false |
| 945 | return ret, nil |
| 946 | } |
| 947 | return r.dec.Token() |
| 948 | } |
| 949 | |
| 950 | func (r *jsReader) beginObject() error { |
| 951 | _, err := r.expect(func(t json.Token) bool { return t == json.Delim('{') }, nil, "start of JSON object: '{'") |
| 952 | return err |
| 953 | } |
| 954 | |
| 955 | func (r *jsReader) endObject() error { |
| 956 | _, err := r.expect(func(t json.Token) bool { return t == json.Delim('}') }, nil, "end of JSON object: '}'") |
| 957 | return err |
| 958 | } |
| 959 | |
| 960 | func (r *jsReader) beginArray() error { |
| 961 | _, err := r.expect(func(t json.Token) bool { return t == json.Delim('[') }, nil, "start of array: '['") |
| 962 | return err |
| 963 | } |
| 964 | |
| 965 | func (r *jsReader) endArray() error { |
| 966 | _, err := r.expect(func(t json.Token) bool { return t == json.Delim(']') }, nil, "end of array: ']'") |
| 967 | return err |
| 968 | } |
| 969 | |
| 970 | func (r *jsReader) nextObjectKey() (string, error) { |
| 971 | return r.nextString() |
| 972 | } |
| 973 | |
| 974 | func (r *jsReader) nextString() (string, error) { |
| 975 | t, err := r.expect(func(t json.Token) bool { _, ok := t.(string); return ok }, "", "string") |
| 976 | if err != nil { |
| 977 | return "", err |
| 978 | } |
| 979 | return t.(string), nil |
| 980 | } |
| 981 | |
| 982 | func (r *jsReader) nextBytes() ([]byte, error) { |
| 983 | str, err := r.nextString() |
| 984 | if err != nil { |
| 985 | return nil, err |
| 986 | } |
| 987 | return base64.StdEncoding.DecodeString(str) |
| 988 | } |
| 989 | |
| 990 | func (r *jsReader) nextBool() (bool, error) { |
| 991 | t, err := r.expect(func(t json.Token) bool { _, ok := t.(bool); return ok }, false, "boolean") |
| 992 | if err != nil { |
| 993 | return false, err |
| 994 | } |
| 995 | return t.(bool), nil |
| 996 | } |
| 997 | |
| 998 | func (r *jsReader) nextInt() (int64, error) { |
| 999 | n, err := r.nextNumber() |
| 1000 | if err != nil { |
| 1001 | return 0, err |
| 1002 | } |
| 1003 | return n.Int64() |
| 1004 | } |
| 1005 | |
| 1006 | func (r *jsReader) nextUint() (uint64, error) { |
| 1007 | n, err := r.nextNumber() |
| 1008 | if err != nil { |
| 1009 | return 0, err |
| 1010 | } |
| 1011 | return strconv.ParseUint(string(n), 10, 64) |
| 1012 | } |
| 1013 | |
| 1014 | func (r *jsReader) nextFloat() (float64, error) { |
| 1015 | n, err := r.nextNumber() |
| 1016 | if err != nil { |
| 1017 | return 0, err |
| 1018 | } |
| 1019 | return n.Float64() |
| 1020 | } |
| 1021 | |
| 1022 | func (r *jsReader) nextNumber() (json.Number, error) { |
| 1023 | t, err := r.expect(func(t json.Token) bool { return reflect.TypeOf(t).Kind() == reflect.String }, "0", "number") |
| 1024 | if err != nil { |
| 1025 | return "", err |
| 1026 | } |
| 1027 | switch t := t.(type) { |
| 1028 | case json.Number: |
| 1029 | return t, nil |
| 1030 | case string: |
| 1031 | return json.Number(t), nil |
| 1032 | } |
| 1033 | return "", fmt.Errorf("expecting a number but got %v", t) |
| 1034 | } |
| 1035 | |
| 1036 | func (r *jsReader) skip() error { |
| 1037 | t, err := r.poll() |
| 1038 | if err != nil { |
| 1039 | return err |
| 1040 | } |
| 1041 | if t == json.Delim('[') { |
| 1042 | if err := r.skipArray(); err != nil { |
| 1043 | return err |
| 1044 | } |
| 1045 | } else if t == json.Delim('{') { |
| 1046 | if err := r.skipObject(); err != nil { |
| 1047 | return err |
| 1048 | } |
| 1049 | } |
| 1050 | return nil |
| 1051 | } |
| 1052 | |
| 1053 | func (r *jsReader) skipArray() error { |
| 1054 | for r.hasNext() { |
| 1055 | if err := r.skip(); err != nil { |
| 1056 | return err |
| 1057 | } |
| 1058 | } |
| 1059 | if err := r.endArray(); err != nil { |
| 1060 | return err |
| 1061 | } |
| 1062 | return nil |
| 1063 | } |
| 1064 | |
| 1065 | func (r *jsReader) skipObject() error { |
| 1066 | for r.hasNext() { |
| 1067 | // skip object key |
| 1068 | if err := r.skip(); err != nil { |
| 1069 | return err |
| 1070 | } |
| 1071 | // and value |
| 1072 | if err := r.skip(); err != nil { |
| 1073 | return err |
| 1074 | } |
| 1075 | } |
| 1076 | if err := r.endObject(); err != nil { |
| 1077 | return err |
| 1078 | } |
| 1079 | return nil |
| 1080 | } |
| 1081 | |
| 1082 | func (r *jsReader) expect(predicate func(json.Token) bool, ifNil interface{}, expected string) (interface{}, error) { |
| 1083 | t, err := r.poll() |
| 1084 | if err != nil { |
| 1085 | return nil, err |
| 1086 | } |
| 1087 | if t == nil && ifNil != nil { |
| 1088 | return ifNil, nil |
| 1089 | } |
| 1090 | if !predicate(t) { |
| 1091 | return t, fmt.Errorf("bad input: expecting %s ; instead got %v", expected, t) |
| 1092 | } |
| 1093 | return t, nil |
| 1094 | } |
| 1095 | |
| 1096 | type concatReader struct { |
| 1097 | bufs []io.Reader |
| 1098 | curr int |
| 1099 | } |
| 1100 | |
| 1101 | func (r *concatReader) Read(p []byte) (n int, err error) { |
| 1102 | for { |
| 1103 | if r.curr >= len(r.bufs) { |
| 1104 | err = io.EOF |
| 1105 | return |
| 1106 | } |
| 1107 | var c int |
| 1108 | c, err = r.bufs[r.curr].Read(p) |
| 1109 | n += c |
| 1110 | if err != io.EOF { |
| 1111 | return |
| 1112 | } |
| 1113 | r.curr++ |
| 1114 | p = p[c:] |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | // AnyResolver returns a jsonpb.AnyResolver that uses the given file descriptors |
| 1119 | // to resolve message names. It uses the given factory, which may be nil, to |
| 1120 | // instantiate messages. The messages that it returns when resolving a type name |
| 1121 | // may often be dynamic messages. |
| 1122 | func AnyResolver(mf *MessageFactory, files ...*desc.FileDescriptor) jsonpb.AnyResolver { |
| 1123 | return &anyResolver{mf: mf, files: files} |
| 1124 | } |
| 1125 | |
| 1126 | type anyResolver struct { |
| 1127 | mf *MessageFactory |
| 1128 | files []*desc.FileDescriptor |
| 1129 | ignored map[*desc.FileDescriptor]struct{} |
| 1130 | other jsonpb.AnyResolver |
| 1131 | } |
| 1132 | |
| 1133 | func wrapResolver(r jsonpb.AnyResolver, mf *MessageFactory, f *desc.FileDescriptor) (jsonpb.AnyResolver, bool) { |
| 1134 | if r, ok := r.(*anyResolver); ok { |
| 1135 | if _, ok := r.ignored[f]; ok { |
| 1136 | // if the current resolver is ignoring this file, it's because another |
| 1137 | // (upstream) resolver is already handling it, so nothing to do |
| 1138 | return r, false |
| 1139 | } |
| 1140 | for _, file := range r.files { |
| 1141 | if file == f { |
| 1142 | // no need to wrap! |
| 1143 | return r, false |
| 1144 | } |
| 1145 | } |
| 1146 | // ignore files that will be checked by the resolver we're wrapping |
| 1147 | // (we'll just delegate and let it search those files) |
| 1148 | ignored := map[*desc.FileDescriptor]struct{}{} |
| 1149 | for i := range r.ignored { |
| 1150 | ignored[i] = struct{}{} |
| 1151 | } |
| 1152 | ignore(r.files, ignored) |
| 1153 | return &anyResolver{mf: mf, files: []*desc.FileDescriptor{f}, ignored: ignored, other: r}, true |
| 1154 | } |
| 1155 | return &anyResolver{mf: mf, files: []*desc.FileDescriptor{f}, other: r}, true |
| 1156 | } |
| 1157 | |
| 1158 | func ignore(files []*desc.FileDescriptor, ignored map[*desc.FileDescriptor]struct{}) { |
| 1159 | for _, f := range files { |
| 1160 | if _, ok := ignored[f]; ok { |
| 1161 | continue |
| 1162 | } |
| 1163 | ignored[f] = struct{}{} |
| 1164 | ignore(f.GetDependencies(), ignored) |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | func (r *anyResolver) Resolve(typeUrl string) (proto.Message, error) { |
| 1169 | mname := typeUrl |
| 1170 | if slash := strings.LastIndex(mname, "/"); slash >= 0 { |
| 1171 | mname = mname[slash+1:] |
| 1172 | } |
| 1173 | |
| 1174 | // see if the user-specified resolver is able to do the job |
| 1175 | if r.other != nil { |
| 1176 | msg, err := r.other.Resolve(typeUrl) |
| 1177 | if err == nil { |
| 1178 | return msg, nil |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | // try to find the message in our known set of files |
| 1183 | checked := map[*desc.FileDescriptor]struct{}{} |
| 1184 | for _, f := range r.files { |
| 1185 | md := r.findMessage(f, mname, checked) |
| 1186 | if md != nil { |
| 1187 | return r.mf.NewMessage(md), nil |
| 1188 | } |
| 1189 | } |
| 1190 | // failing that, see if the message factory knows about this type |
| 1191 | var ktr *KnownTypeRegistry |
| 1192 | if r.mf != nil { |
| 1193 | ktr = r.mf.ktr |
| 1194 | } else { |
| 1195 | ktr = (*KnownTypeRegistry)(nil) |
| 1196 | } |
| 1197 | m := ktr.CreateIfKnown(mname) |
| 1198 | if m != nil { |
| 1199 | return m, nil |
| 1200 | } |
| 1201 | |
| 1202 | // no other resolver to fallback to? mimic default behavior |
| 1203 | mt := proto.MessageType(mname) |
| 1204 | if mt == nil { |
| 1205 | return nil, fmt.Errorf("unknown message type %q", mname) |
| 1206 | } |
| 1207 | return reflect.New(mt.Elem()).Interface().(proto.Message), nil |
| 1208 | } |
| 1209 | |
| 1210 | func (r *anyResolver) findMessage(fd *desc.FileDescriptor, msgName string, checked map[*desc.FileDescriptor]struct{}) *desc.MessageDescriptor { |
| 1211 | // if this is an ignored descriptor, skip |
| 1212 | if _, ok := r.ignored[fd]; ok { |
| 1213 | return nil |
| 1214 | } |
| 1215 | |
| 1216 | // bail if we've already checked this file |
| 1217 | if _, ok := checked[fd]; ok { |
| 1218 | return nil |
| 1219 | } |
| 1220 | checked[fd] = struct{}{} |
| 1221 | |
| 1222 | // see if this file has the message |
| 1223 | md := fd.FindMessage(msgName) |
| 1224 | if md != nil { |
| 1225 | return md |
| 1226 | } |
| 1227 | |
| 1228 | // if not, recursively search the file's imports |
| 1229 | for _, dep := range fd.GetDependencies() { |
| 1230 | md = r.findMessage(dep, msgName, checked) |
| 1231 | if md != nil { |
| 1232 | return md |
| 1233 | } |
| 1234 | } |
| 1235 | return nil |
| 1236 | } |
| 1237 | |
| 1238 | var _ jsonpb.AnyResolver = (*anyResolver)(nil) |