Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | // Copyright (C) MongoDB, Inc. 2017-present. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 4 | // not use this file except in compliance with the License. You may obtain |
| 5 | // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | |
| 7 | package bsoncodec |
| 8 | |
| 9 | import ( |
| 10 | "encoding/json" |
| 11 | "errors" |
| 12 | "fmt" |
| 13 | "math" |
| 14 | "net/url" |
| 15 | "reflect" |
| 16 | "strconv" |
| 17 | "time" |
| 18 | |
| 19 | "github.com/mongodb/mongo-go-driver/bson/bsonrw" |
| 20 | "github.com/mongodb/mongo-go-driver/bson/bsontype" |
| 21 | "github.com/mongodb/mongo-go-driver/bson/primitive" |
| 22 | "github.com/mongodb/mongo-go-driver/x/bsonx/bsoncore" |
| 23 | ) |
| 24 | |
| 25 | var defaultValueDecoders DefaultValueDecoders |
| 26 | |
| 27 | // DefaultValueDecoders is a namespace type for the default ValueDecoders used |
| 28 | // when creating a registry. |
| 29 | type DefaultValueDecoders struct{} |
| 30 | |
| 31 | // RegisterDefaultDecoders will register the decoder methods attached to DefaultValueDecoders with |
| 32 | // the provided RegistryBuilder. |
| 33 | // |
| 34 | // There is no support for decoding map[string]interface{} becuase there is no decoder for |
| 35 | // interface{}, so users must either register this decoder themselves or use the |
| 36 | // EmptyInterfaceDecoder avaialble in the bson package. |
| 37 | func (dvd DefaultValueDecoders) RegisterDefaultDecoders(rb *RegistryBuilder) { |
| 38 | if rb == nil { |
| 39 | panic(errors.New("argument to RegisterDefaultDecoders must not be nil")) |
| 40 | } |
| 41 | |
| 42 | rb. |
| 43 | RegisterDecoder(tBinary, ValueDecoderFunc(dvd.BinaryDecodeValue)). |
| 44 | RegisterDecoder(tUndefined, ValueDecoderFunc(dvd.UndefinedDecodeValue)). |
| 45 | RegisterDecoder(tDateTime, ValueDecoderFunc(dvd.DateTimeDecodeValue)). |
| 46 | RegisterDecoder(tNull, ValueDecoderFunc(dvd.NullDecodeValue)). |
| 47 | RegisterDecoder(tRegex, ValueDecoderFunc(dvd.RegexDecodeValue)). |
| 48 | RegisterDecoder(tDBPointer, ValueDecoderFunc(dvd.DBPointerDecodeValue)). |
| 49 | RegisterDecoder(tTimestamp, ValueDecoderFunc(dvd.TimestampDecodeValue)). |
| 50 | RegisterDecoder(tMinKey, ValueDecoderFunc(dvd.MinKeyDecodeValue)). |
| 51 | RegisterDecoder(tMaxKey, ValueDecoderFunc(dvd.MaxKeyDecodeValue)). |
| 52 | RegisterDecoder(tJavaScript, ValueDecoderFunc(dvd.JavaScriptDecodeValue)). |
| 53 | RegisterDecoder(tSymbol, ValueDecoderFunc(dvd.SymbolDecodeValue)). |
| 54 | RegisterDecoder(tByteSlice, ValueDecoderFunc(dvd.ByteSliceDecodeValue)). |
| 55 | RegisterDecoder(tTime, ValueDecoderFunc(dvd.TimeDecodeValue)). |
| 56 | RegisterDecoder(tEmpty, ValueDecoderFunc(dvd.EmptyInterfaceDecodeValue)). |
| 57 | RegisterDecoder(tOID, ValueDecoderFunc(dvd.ObjectIDDecodeValue)). |
| 58 | RegisterDecoder(tDecimal, ValueDecoderFunc(dvd.Decimal128DecodeValue)). |
| 59 | RegisterDecoder(tJSONNumber, ValueDecoderFunc(dvd.JSONNumberDecodeValue)). |
| 60 | RegisterDecoder(tURL, ValueDecoderFunc(dvd.URLDecodeValue)). |
| 61 | RegisterDecoder(tValueUnmarshaler, ValueDecoderFunc(dvd.ValueUnmarshalerDecodeValue)). |
| 62 | RegisterDecoder(tUnmarshaler, ValueDecoderFunc(dvd.UnmarshalerDecodeValue)). |
| 63 | RegisterDecoder(tCoreDocument, ValueDecoderFunc(dvd.CoreDocumentDecodeValue)). |
| 64 | RegisterDecoder(tCodeWithScope, ValueDecoderFunc(dvd.CodeWithScopeDecodeValue)). |
| 65 | RegisterDefaultDecoder(reflect.Bool, ValueDecoderFunc(dvd.BooleanDecodeValue)). |
| 66 | RegisterDefaultDecoder(reflect.Int, ValueDecoderFunc(dvd.IntDecodeValue)). |
| 67 | RegisterDefaultDecoder(reflect.Int8, ValueDecoderFunc(dvd.IntDecodeValue)). |
| 68 | RegisterDefaultDecoder(reflect.Int16, ValueDecoderFunc(dvd.IntDecodeValue)). |
| 69 | RegisterDefaultDecoder(reflect.Int32, ValueDecoderFunc(dvd.IntDecodeValue)). |
| 70 | RegisterDefaultDecoder(reflect.Int64, ValueDecoderFunc(dvd.IntDecodeValue)). |
| 71 | RegisterDefaultDecoder(reflect.Uint, ValueDecoderFunc(dvd.UintDecodeValue)). |
| 72 | RegisterDefaultDecoder(reflect.Uint8, ValueDecoderFunc(dvd.UintDecodeValue)). |
| 73 | RegisterDefaultDecoder(reflect.Uint16, ValueDecoderFunc(dvd.UintDecodeValue)). |
| 74 | RegisterDefaultDecoder(reflect.Uint32, ValueDecoderFunc(dvd.UintDecodeValue)). |
| 75 | RegisterDefaultDecoder(reflect.Uint64, ValueDecoderFunc(dvd.UintDecodeValue)). |
| 76 | RegisterDefaultDecoder(reflect.Float32, ValueDecoderFunc(dvd.FloatDecodeValue)). |
| 77 | RegisterDefaultDecoder(reflect.Float64, ValueDecoderFunc(dvd.FloatDecodeValue)). |
| 78 | RegisterDefaultDecoder(reflect.Array, ValueDecoderFunc(dvd.ArrayDecodeValue)). |
| 79 | RegisterDefaultDecoder(reflect.Map, ValueDecoderFunc(dvd.MapDecodeValue)). |
| 80 | RegisterDefaultDecoder(reflect.Slice, ValueDecoderFunc(dvd.SliceDecodeValue)). |
| 81 | RegisterDefaultDecoder(reflect.String, ValueDecoderFunc(dvd.StringDecodeValue)). |
| 82 | RegisterDefaultDecoder(reflect.Struct, &StructCodec{cache: make(map[reflect.Type]*structDescription), parser: DefaultStructTagParser}). |
| 83 | RegisterDefaultDecoder(reflect.Ptr, NewPointerCodec()). |
| 84 | RegisterTypeMapEntry(bsontype.Double, tFloat64). |
| 85 | RegisterTypeMapEntry(bsontype.String, tString). |
| 86 | RegisterTypeMapEntry(bsontype.Array, tA). |
| 87 | RegisterTypeMapEntry(bsontype.Binary, tBinary). |
| 88 | RegisterTypeMapEntry(bsontype.Undefined, tUndefined). |
| 89 | RegisterTypeMapEntry(bsontype.ObjectID, tOID). |
| 90 | RegisterTypeMapEntry(bsontype.Boolean, tBool). |
| 91 | RegisterTypeMapEntry(bsontype.DateTime, tDateTime). |
| 92 | RegisterTypeMapEntry(bsontype.Regex, tRegex). |
| 93 | RegisterTypeMapEntry(bsontype.DBPointer, tDBPointer). |
| 94 | RegisterTypeMapEntry(bsontype.JavaScript, tJavaScript). |
| 95 | RegisterTypeMapEntry(bsontype.Symbol, tSymbol). |
| 96 | RegisterTypeMapEntry(bsontype.CodeWithScope, tCodeWithScope). |
| 97 | RegisterTypeMapEntry(bsontype.Int32, tInt32). |
| 98 | RegisterTypeMapEntry(bsontype.Int64, tInt64). |
| 99 | RegisterTypeMapEntry(bsontype.Timestamp, tTimestamp). |
| 100 | RegisterTypeMapEntry(bsontype.Decimal128, tDecimal). |
| 101 | RegisterTypeMapEntry(bsontype.MinKey, tMinKey). |
| 102 | RegisterTypeMapEntry(bsontype.MaxKey, tMaxKey). |
| 103 | RegisterTypeMapEntry(bsontype.Type(0), tD) |
| 104 | } |
| 105 | |
| 106 | // BooleanDecodeValue is the ValueDecoderFunc for bool types. |
| 107 | func (dvd DefaultValueDecoders) BooleanDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 108 | if vr.Type() != bsontype.Boolean { |
| 109 | return fmt.Errorf("cannot decode %v into a boolean", vr.Type()) |
| 110 | } |
| 111 | if !val.IsValid() || !val.CanSet() || val.Kind() != reflect.Bool { |
| 112 | return ValueDecoderError{Name: "BooleanDecodeValue", Kinds: []reflect.Kind{reflect.Bool}, Received: val} |
| 113 | } |
| 114 | |
| 115 | b, err := vr.ReadBoolean() |
| 116 | val.SetBool(b) |
| 117 | return err |
| 118 | } |
| 119 | |
| 120 | // IntDecodeValue is the ValueDecoderFunc for bool types. |
| 121 | func (dvd DefaultValueDecoders) IntDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 122 | var i64 int64 |
| 123 | var err error |
| 124 | switch vr.Type() { |
| 125 | case bsontype.Int32: |
| 126 | i32, err := vr.ReadInt32() |
| 127 | if err != nil { |
| 128 | return err |
| 129 | } |
| 130 | i64 = int64(i32) |
| 131 | case bsontype.Int64: |
| 132 | i64, err = vr.ReadInt64() |
| 133 | if err != nil { |
| 134 | return err |
| 135 | } |
| 136 | case bsontype.Double: |
| 137 | f64, err := vr.ReadDouble() |
| 138 | if err != nil { |
| 139 | return err |
| 140 | } |
| 141 | if !dc.Truncate && math.Floor(f64) != f64 { |
| 142 | return errors.New("IntDecodeValue can only truncate float64 to an integer type when truncation is enabled") |
| 143 | } |
| 144 | if f64 > float64(math.MaxInt64) { |
| 145 | return fmt.Errorf("%g overflows int64", f64) |
| 146 | } |
| 147 | i64 = int64(f64) |
| 148 | default: |
| 149 | return fmt.Errorf("cannot decode %v into an integer type", vr.Type()) |
| 150 | } |
| 151 | |
| 152 | if !val.CanSet() { |
| 153 | return ValueDecoderError{ |
| 154 | Name: "IntDecodeValue", |
| 155 | Kinds: []reflect.Kind{reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int}, |
| 156 | Received: val, |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | switch val.Kind() { |
| 161 | case reflect.Int8: |
| 162 | if i64 < math.MinInt8 || i64 > math.MaxInt8 { |
| 163 | return fmt.Errorf("%d overflows int8", i64) |
| 164 | } |
| 165 | case reflect.Int16: |
| 166 | if i64 < math.MinInt16 || i64 > math.MaxInt16 { |
| 167 | return fmt.Errorf("%d overflows int16", i64) |
| 168 | } |
| 169 | case reflect.Int32: |
| 170 | if i64 < math.MinInt32 || i64 > math.MaxInt32 { |
| 171 | return fmt.Errorf("%d overflows int32", i64) |
| 172 | } |
| 173 | case reflect.Int64: |
| 174 | case reflect.Int: |
| 175 | if int64(int(i64)) != i64 { // Can we fit this inside of an int |
| 176 | return fmt.Errorf("%d overflows int", i64) |
| 177 | } |
| 178 | default: |
| 179 | return ValueDecoderError{ |
| 180 | Name: "IntDecodeValue", |
| 181 | Kinds: []reflect.Kind{reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int}, |
| 182 | Received: val, |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | val.SetInt(i64) |
| 187 | return nil |
| 188 | } |
| 189 | |
| 190 | // UintDecodeValue is the ValueDecoderFunc for uint types. |
| 191 | func (dvd DefaultValueDecoders) UintDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 192 | var i64 int64 |
| 193 | var err error |
| 194 | switch vr.Type() { |
| 195 | case bsontype.Int32: |
| 196 | i32, err := vr.ReadInt32() |
| 197 | if err != nil { |
| 198 | return err |
| 199 | } |
| 200 | i64 = int64(i32) |
| 201 | case bsontype.Int64: |
| 202 | i64, err = vr.ReadInt64() |
| 203 | if err != nil { |
| 204 | return err |
| 205 | } |
| 206 | case bsontype.Double: |
| 207 | f64, err := vr.ReadDouble() |
| 208 | if err != nil { |
| 209 | return err |
| 210 | } |
| 211 | if !dc.Truncate && math.Floor(f64) != f64 { |
| 212 | return errors.New("UintDecodeValue can only truncate float64 to an integer type when truncation is enabled") |
| 213 | } |
| 214 | if f64 > float64(math.MaxInt64) { |
| 215 | return fmt.Errorf("%g overflows int64", f64) |
| 216 | } |
| 217 | i64 = int64(f64) |
| 218 | default: |
| 219 | return fmt.Errorf("cannot decode %v into an integer type", vr.Type()) |
| 220 | } |
| 221 | |
| 222 | if !val.CanSet() { |
| 223 | return ValueDecoderError{ |
| 224 | Name: "UintDecodeValue", |
| 225 | Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint}, |
| 226 | Received: val, |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | switch val.Kind() { |
| 231 | case reflect.Uint8: |
| 232 | if i64 < 0 || i64 > math.MaxUint8 { |
| 233 | return fmt.Errorf("%d overflows uint8", i64) |
| 234 | } |
| 235 | case reflect.Uint16: |
| 236 | if i64 < 0 || i64 > math.MaxUint16 { |
| 237 | return fmt.Errorf("%d overflows uint16", i64) |
| 238 | } |
| 239 | case reflect.Uint32: |
| 240 | if i64 < 0 || i64 > math.MaxUint32 { |
| 241 | return fmt.Errorf("%d overflows uint32", i64) |
| 242 | } |
| 243 | case reflect.Uint64: |
| 244 | if i64 < 0 { |
| 245 | return fmt.Errorf("%d overflows uint64", i64) |
| 246 | } |
| 247 | case reflect.Uint: |
| 248 | if i64 < 0 || int64(uint(i64)) != i64 { // Can we fit this inside of an uint |
| 249 | return fmt.Errorf("%d overflows uint", i64) |
| 250 | } |
| 251 | default: |
| 252 | return ValueDecoderError{ |
| 253 | Name: "UintDecodeValue", |
| 254 | Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint}, |
| 255 | Received: val, |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | val.SetUint(uint64(i64)) |
| 260 | return nil |
| 261 | } |
| 262 | |
| 263 | // FloatDecodeValue is the ValueDecoderFunc for float types. |
| 264 | func (dvd DefaultValueDecoders) FloatDecodeValue(ec DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 265 | var f float64 |
| 266 | var err error |
| 267 | switch vr.Type() { |
| 268 | case bsontype.Int32: |
| 269 | i32, err := vr.ReadInt32() |
| 270 | if err != nil { |
| 271 | return err |
| 272 | } |
| 273 | f = float64(i32) |
| 274 | case bsontype.Int64: |
| 275 | i64, err := vr.ReadInt64() |
| 276 | if err != nil { |
| 277 | return err |
| 278 | } |
| 279 | f = float64(i64) |
| 280 | case bsontype.Double: |
| 281 | f, err = vr.ReadDouble() |
| 282 | if err != nil { |
| 283 | return err |
| 284 | } |
| 285 | default: |
| 286 | return fmt.Errorf("cannot decode %v into a float32 or float64 type", vr.Type()) |
| 287 | } |
| 288 | |
| 289 | if !val.CanSet() { |
| 290 | return ValueDecoderError{Name: "FloatDecodeValue", Kinds: []reflect.Kind{reflect.Float32, reflect.Float64}, Received: val} |
| 291 | } |
| 292 | |
| 293 | switch val.Kind() { |
| 294 | case reflect.Float32: |
| 295 | if !ec.Truncate && float64(float32(f)) != f { |
| 296 | return errors.New("FloatDecodeValue can only convert float64 to float32 when truncation is allowed") |
| 297 | } |
| 298 | case reflect.Float64: |
| 299 | default: |
| 300 | return ValueDecoderError{Name: "FloatDecodeValue", Kinds: []reflect.Kind{reflect.Float32, reflect.Float64}, Received: val} |
| 301 | } |
| 302 | |
| 303 | val.SetFloat(f) |
| 304 | return nil |
| 305 | } |
| 306 | |
| 307 | // StringDecodeValue is the ValueDecoderFunc for string types. |
| 308 | func (dvd DefaultValueDecoders) StringDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 309 | var str string |
| 310 | var err error |
| 311 | switch vr.Type() { |
| 312 | // TODO(GODRIVER-577): Handle JavaScript and Symbol BSON types when allowed. |
| 313 | case bsontype.String: |
| 314 | str, err = vr.ReadString() |
| 315 | if err != nil { |
| 316 | return err |
| 317 | } |
| 318 | default: |
| 319 | return fmt.Errorf("cannot decode %v into a string type", vr.Type()) |
| 320 | } |
| 321 | if !val.CanSet() || val.Kind() != reflect.String { |
| 322 | return ValueDecoderError{Name: "StringDecodeValue", Kinds: []reflect.Kind{reflect.String}, Received: val} |
| 323 | } |
| 324 | |
| 325 | val.SetString(str) |
| 326 | return nil |
| 327 | } |
| 328 | |
| 329 | // JavaScriptDecodeValue is the ValueDecoderFunc for the primitive.JavaScript type. |
| 330 | func (DefaultValueDecoders) JavaScriptDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 331 | if !val.CanSet() || val.Type() != tJavaScript { |
| 332 | return ValueDecoderError{Name: "BinaryDecodeValue", Types: []reflect.Type{tJavaScript}, Received: val} |
| 333 | } |
| 334 | |
| 335 | if vr.Type() != bsontype.JavaScript { |
| 336 | return fmt.Errorf("cannot decode %v into a primitive.JavaScript", vr.Type()) |
| 337 | } |
| 338 | |
| 339 | js, err := vr.ReadJavascript() |
| 340 | if err != nil { |
| 341 | return err |
| 342 | } |
| 343 | |
| 344 | val.SetString(js) |
| 345 | return nil |
| 346 | } |
| 347 | |
| 348 | // SymbolDecodeValue is the ValueDecoderFunc for the primitive.Symbol type. |
| 349 | func (DefaultValueDecoders) SymbolDecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 350 | if !val.CanSet() || val.Type() != tSymbol { |
| 351 | return ValueDecoderError{Name: "BinaryDecodeValue", Types: []reflect.Type{tSymbol}, Received: val} |
| 352 | } |
| 353 | |
| 354 | if vr.Type() != bsontype.Symbol { |
| 355 | return fmt.Errorf("cannot decode %v into a primitive.Symbol", vr.Type()) |
| 356 | } |
| 357 | |
| 358 | symbol, err := vr.ReadSymbol() |
| 359 | if err != nil { |
| 360 | return err |
| 361 | } |
| 362 | |
| 363 | val.SetString(symbol) |
| 364 | return nil |
| 365 | } |
| 366 | |
| 367 | // BinaryDecodeValue is the ValueDecoderFunc for Binary. |
| 368 | func (DefaultValueDecoders) BinaryDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 369 | if !val.CanSet() || val.Type() != tBinary { |
| 370 | return ValueDecoderError{Name: "BinaryDecodeValue", Types: []reflect.Type{tBinary}, Received: val} |
| 371 | } |
| 372 | |
| 373 | if vr.Type() != bsontype.Binary { |
| 374 | return fmt.Errorf("cannot decode %v into a Binary", vr.Type()) |
| 375 | } |
| 376 | |
| 377 | data, subtype, err := vr.ReadBinary() |
| 378 | if err != nil { |
| 379 | return err |
| 380 | } |
| 381 | |
| 382 | val.Set(reflect.ValueOf(primitive.Binary{Subtype: subtype, Data: data})) |
| 383 | return nil |
| 384 | } |
| 385 | |
| 386 | // UndefinedDecodeValue is the ValueDecoderFunc for Undefined. |
| 387 | func (DefaultValueDecoders) UndefinedDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 388 | if !val.CanSet() || val.Type() != tUndefined { |
| 389 | return ValueDecoderError{Name: "UndefinedDecodeValue", Types: []reflect.Type{tUndefined}, Received: val} |
| 390 | } |
| 391 | |
| 392 | if vr.Type() != bsontype.Undefined { |
| 393 | return fmt.Errorf("cannot decode %v into an Undefined", vr.Type()) |
| 394 | } |
| 395 | |
| 396 | val.Set(reflect.ValueOf(primitive.Undefined{})) |
| 397 | return vr.ReadUndefined() |
| 398 | } |
| 399 | |
| 400 | // ObjectIDDecodeValue is the ValueDecoderFunc for primitive.ObjectID. |
| 401 | func (dvd DefaultValueDecoders) ObjectIDDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 402 | if !val.CanSet() || val.Type() != tOID { |
| 403 | return ValueDecoderError{Name: "ObjectIDDecodeValue", Types: []reflect.Type{tOID}, Received: val} |
| 404 | } |
| 405 | |
| 406 | if vr.Type() != bsontype.ObjectID { |
| 407 | return fmt.Errorf("cannot decode %v into an ObjectID", vr.Type()) |
| 408 | } |
| 409 | oid, err := vr.ReadObjectID() |
| 410 | val.Set(reflect.ValueOf(oid)) |
| 411 | return err |
| 412 | } |
| 413 | |
| 414 | // DateTimeDecodeValue is the ValueDecoderFunc for DateTime. |
| 415 | func (DefaultValueDecoders) DateTimeDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 416 | if !val.CanSet() || val.Type() != tDateTime { |
| 417 | return ValueDecoderError{Name: "DateTimeDecodeValue", Types: []reflect.Type{tDateTime}, Received: val} |
| 418 | } |
| 419 | |
| 420 | if vr.Type() != bsontype.DateTime { |
| 421 | return fmt.Errorf("cannot decode %v into a DateTime", vr.Type()) |
| 422 | } |
| 423 | |
| 424 | dt, err := vr.ReadDateTime() |
| 425 | if err != nil { |
| 426 | return err |
| 427 | } |
| 428 | |
| 429 | val.Set(reflect.ValueOf(primitive.DateTime(dt))) |
| 430 | return nil |
| 431 | } |
| 432 | |
| 433 | // NullDecodeValue is the ValueDecoderFunc for Null. |
| 434 | func (DefaultValueDecoders) NullDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 435 | if !val.CanSet() || val.Type() != tNull { |
| 436 | return ValueDecoderError{Name: "NullDecodeValue", Types: []reflect.Type{tNull}, Received: val} |
| 437 | } |
| 438 | |
| 439 | if vr.Type() != bsontype.Null { |
| 440 | return fmt.Errorf("cannot decode %v into a Null", vr.Type()) |
| 441 | } |
| 442 | |
| 443 | val.Set(reflect.ValueOf(primitive.Null{})) |
| 444 | return vr.ReadNull() |
| 445 | } |
| 446 | |
| 447 | // RegexDecodeValue is the ValueDecoderFunc for Regex. |
| 448 | func (DefaultValueDecoders) RegexDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 449 | if !val.CanSet() || val.Type() != tRegex { |
| 450 | return ValueDecoderError{Name: "RegexDecodeValue", Types: []reflect.Type{tRegex}, Received: val} |
| 451 | } |
| 452 | |
| 453 | if vr.Type() != bsontype.Regex { |
| 454 | return fmt.Errorf("cannot decode %v into a Regex", vr.Type()) |
| 455 | } |
| 456 | |
| 457 | pattern, options, err := vr.ReadRegex() |
| 458 | if err != nil { |
| 459 | return err |
| 460 | } |
| 461 | |
| 462 | val.Set(reflect.ValueOf(primitive.Regex{Pattern: pattern, Options: options})) |
| 463 | return nil |
| 464 | } |
| 465 | |
| 466 | // DBPointerDecodeValue is the ValueDecoderFunc for DBPointer. |
| 467 | func (DefaultValueDecoders) DBPointerDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 468 | if !val.CanSet() || val.Type() != tDBPointer { |
| 469 | return ValueDecoderError{Name: "DBPointerDecodeValue", Types: []reflect.Type{tDBPointer}, Received: val} |
| 470 | } |
| 471 | |
| 472 | if vr.Type() != bsontype.DBPointer { |
| 473 | return fmt.Errorf("cannot decode %v into a DBPointer", vr.Type()) |
| 474 | } |
| 475 | |
| 476 | ns, pointer, err := vr.ReadDBPointer() |
| 477 | if err != nil { |
| 478 | return err |
| 479 | } |
| 480 | |
| 481 | val.Set(reflect.ValueOf(primitive.DBPointer{DB: ns, Pointer: pointer})) |
| 482 | return nil |
| 483 | } |
| 484 | |
| 485 | // TimestampDecodeValue is the ValueDecoderFunc for Timestamp. |
| 486 | func (DefaultValueDecoders) TimestampDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 487 | if !val.CanSet() || val.Type() != tTimestamp { |
| 488 | return ValueDecoderError{Name: "TimestampDecodeValue", Types: []reflect.Type{tTimestamp}, Received: val} |
| 489 | } |
| 490 | |
| 491 | if vr.Type() != bsontype.Timestamp { |
| 492 | return fmt.Errorf("cannot decode %v into a Timestamp", vr.Type()) |
| 493 | } |
| 494 | |
| 495 | t, incr, err := vr.ReadTimestamp() |
| 496 | if err != nil { |
| 497 | return err |
| 498 | } |
| 499 | |
| 500 | val.Set(reflect.ValueOf(primitive.Timestamp{T: t, I: incr})) |
| 501 | return nil |
| 502 | } |
| 503 | |
| 504 | // MinKeyDecodeValue is the ValueDecoderFunc for MinKey. |
| 505 | func (DefaultValueDecoders) MinKeyDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 506 | if !val.CanSet() || val.Type() != tMinKey { |
| 507 | return ValueDecoderError{Name: "MinKeyDecodeValue", Types: []reflect.Type{tMinKey}, Received: val} |
| 508 | } |
| 509 | |
| 510 | if vr.Type() != bsontype.MinKey { |
| 511 | return fmt.Errorf("cannot decode %v into a MinKey", vr.Type()) |
| 512 | } |
| 513 | |
| 514 | val.Set(reflect.ValueOf(primitive.MinKey{})) |
| 515 | return vr.ReadMinKey() |
| 516 | } |
| 517 | |
| 518 | // MaxKeyDecodeValue is the ValueDecoderFunc for MaxKey. |
| 519 | func (DefaultValueDecoders) MaxKeyDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 520 | if !val.CanSet() || val.Type() != tMaxKey { |
| 521 | return ValueDecoderError{Name: "MaxKeyDecodeValue", Types: []reflect.Type{tMaxKey}, Received: val} |
| 522 | } |
| 523 | |
| 524 | if vr.Type() != bsontype.MaxKey { |
| 525 | return fmt.Errorf("cannot decode %v into a MaxKey", vr.Type()) |
| 526 | } |
| 527 | |
| 528 | val.Set(reflect.ValueOf(primitive.MaxKey{})) |
| 529 | return vr.ReadMaxKey() |
| 530 | } |
| 531 | |
| 532 | // Decimal128DecodeValue is the ValueDecoderFunc for primitive.Decimal128. |
| 533 | func (dvd DefaultValueDecoders) Decimal128DecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 534 | if vr.Type() != bsontype.Decimal128 { |
| 535 | return fmt.Errorf("cannot decode %v into a primitive.Decimal128", vr.Type()) |
| 536 | } |
| 537 | |
| 538 | if !val.CanSet() || val.Type() != tDecimal { |
| 539 | return ValueDecoderError{Name: "Decimal128DecodeValue", Types: []reflect.Type{tDecimal}, Received: val} |
| 540 | } |
| 541 | d128, err := vr.ReadDecimal128() |
| 542 | val.Set(reflect.ValueOf(d128)) |
| 543 | return err |
| 544 | } |
| 545 | |
| 546 | // JSONNumberDecodeValue is the ValueDecoderFunc for json.Number. |
| 547 | func (dvd DefaultValueDecoders) JSONNumberDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 548 | if !val.CanSet() || val.Type() != tJSONNumber { |
| 549 | return ValueDecoderError{Name: "JSONNumberDecodeValue", Types: []reflect.Type{tJSONNumber}, Received: val} |
| 550 | } |
| 551 | |
| 552 | switch vr.Type() { |
| 553 | case bsontype.Double: |
| 554 | f64, err := vr.ReadDouble() |
| 555 | if err != nil { |
| 556 | return err |
| 557 | } |
| 558 | val.Set(reflect.ValueOf(json.Number(strconv.FormatFloat(f64, 'g', -1, 64)))) |
| 559 | case bsontype.Int32: |
| 560 | i32, err := vr.ReadInt32() |
| 561 | if err != nil { |
| 562 | return err |
| 563 | } |
| 564 | val.Set(reflect.ValueOf(json.Number(strconv.FormatInt(int64(i32), 10)))) |
| 565 | case bsontype.Int64: |
| 566 | i64, err := vr.ReadInt64() |
| 567 | if err != nil { |
| 568 | return err |
| 569 | } |
| 570 | val.Set(reflect.ValueOf(json.Number(strconv.FormatInt(i64, 10)))) |
| 571 | default: |
| 572 | return fmt.Errorf("cannot decode %v into a json.Number", vr.Type()) |
| 573 | } |
| 574 | |
| 575 | return nil |
| 576 | } |
| 577 | |
| 578 | // URLDecodeValue is the ValueDecoderFunc for url.URL. |
| 579 | func (dvd DefaultValueDecoders) URLDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 580 | if vr.Type() != bsontype.String { |
| 581 | return fmt.Errorf("cannot decode %v into a *url.URL", vr.Type()) |
| 582 | } |
| 583 | |
| 584 | str, err := vr.ReadString() |
| 585 | if err != nil { |
| 586 | return err |
| 587 | } |
| 588 | |
| 589 | u, err := url.Parse(str) |
| 590 | if err != nil { |
| 591 | return err |
| 592 | } |
| 593 | |
| 594 | if !val.CanSet() || val.Type() != tURL { |
| 595 | return ValueDecoderError{Name: "URLDecodeValue", Types: []reflect.Type{tURL}, Received: val} |
| 596 | } |
| 597 | |
| 598 | val.Set(reflect.ValueOf(u).Elem()) |
| 599 | return nil |
| 600 | } |
| 601 | |
| 602 | // TimeDecodeValue is the ValueDecoderFunc for time.Time. |
| 603 | func (dvd DefaultValueDecoders) TimeDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 604 | if vr.Type() != bsontype.DateTime { |
| 605 | return fmt.Errorf("cannot decode %v into a time.Time", vr.Type()) |
| 606 | } |
| 607 | |
| 608 | dt, err := vr.ReadDateTime() |
| 609 | if err != nil { |
| 610 | return err |
| 611 | } |
| 612 | |
| 613 | if !val.CanSet() || val.Type() != tTime { |
| 614 | return ValueDecoderError{Name: "TimeDecodeValue", Types: []reflect.Type{tTime}, Received: val} |
| 615 | } |
| 616 | |
| 617 | val.Set(reflect.ValueOf(time.Unix(dt/1000, dt%1000*1000000))) |
| 618 | return nil |
| 619 | } |
| 620 | |
| 621 | // ByteSliceDecodeValue is the ValueDecoderFunc for []byte. |
| 622 | func (dvd DefaultValueDecoders) ByteSliceDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 623 | if vr.Type() != bsontype.Binary && vr.Type() != bsontype.Null { |
| 624 | return fmt.Errorf("cannot decode %v into a []byte", vr.Type()) |
| 625 | } |
| 626 | |
| 627 | if !val.CanSet() || val.Type() != tByteSlice { |
| 628 | return ValueDecoderError{Name: "ByteSliceDecodeValue", Types: []reflect.Type{tByteSlice}, Received: val} |
| 629 | } |
| 630 | |
| 631 | if vr.Type() == bsontype.Null { |
| 632 | val.Set(reflect.Zero(val.Type())) |
| 633 | return vr.ReadNull() |
| 634 | } |
| 635 | |
| 636 | data, subtype, err := vr.ReadBinary() |
| 637 | if err != nil { |
| 638 | return err |
| 639 | } |
| 640 | if subtype != 0x00 { |
| 641 | return fmt.Errorf("ByteSliceDecodeValue can only be used to decode subtype 0x00 for %s, got %v", bsontype.Binary, subtype) |
| 642 | } |
| 643 | |
| 644 | val.Set(reflect.ValueOf(data)) |
| 645 | return nil |
| 646 | } |
| 647 | |
| 648 | // MapDecodeValue is the ValueDecoderFunc for map[string]* types. |
| 649 | func (dvd DefaultValueDecoders) MapDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 650 | if !val.CanSet() || val.Kind() != reflect.Map || val.Type().Key().Kind() != reflect.String { |
| 651 | return ValueDecoderError{Name: "MapDecodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val} |
| 652 | } |
| 653 | |
| 654 | switch vr.Type() { |
| 655 | case bsontype.Type(0), bsontype.EmbeddedDocument: |
| 656 | case bsontype.Null: |
| 657 | val.Set(reflect.Zero(val.Type())) |
| 658 | return vr.ReadNull() |
| 659 | default: |
| 660 | return fmt.Errorf("cannot decode %v into a %s", vr.Type(), val.Type()) |
| 661 | } |
| 662 | |
| 663 | dr, err := vr.ReadDocument() |
| 664 | if err != nil { |
| 665 | return err |
| 666 | } |
| 667 | |
| 668 | if val.IsNil() { |
| 669 | val.Set(reflect.MakeMap(val.Type())) |
| 670 | } |
| 671 | |
| 672 | eType := val.Type().Elem() |
| 673 | decoder, err := dc.LookupDecoder(eType) |
| 674 | if err != nil { |
| 675 | return err |
| 676 | } |
| 677 | |
| 678 | if eType == tEmpty { |
| 679 | dc.Ancestor = val.Type() |
| 680 | } |
| 681 | |
| 682 | keyType := val.Type().Key() |
| 683 | for { |
| 684 | key, vr, err := dr.ReadElement() |
| 685 | if err == bsonrw.ErrEOD { |
| 686 | break |
| 687 | } |
| 688 | if err != nil { |
| 689 | return err |
| 690 | } |
| 691 | |
| 692 | elem := reflect.New(eType).Elem() |
| 693 | |
| 694 | err = decoder.DecodeValue(dc, vr, elem) |
| 695 | if err != nil { |
| 696 | return err |
| 697 | } |
| 698 | |
| 699 | val.SetMapIndex(reflect.ValueOf(key).Convert(keyType), elem) |
| 700 | } |
| 701 | return nil |
| 702 | } |
| 703 | |
| 704 | // ArrayDecodeValue is the ValueDecoderFunc for array types. |
| 705 | func (dvd DefaultValueDecoders) ArrayDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 706 | if !val.IsValid() || val.Kind() != reflect.Array { |
| 707 | return ValueDecoderError{Name: "ArrayDecodeValue", Kinds: []reflect.Kind{reflect.Array}, Received: val} |
| 708 | } |
| 709 | |
| 710 | switch vr.Type() { |
| 711 | case bsontype.Array: |
| 712 | case bsontype.Type(0), bsontype.EmbeddedDocument: |
| 713 | if val.Type().Elem() != tE { |
| 714 | return fmt.Errorf("cannot decode document into %s", val.Type()) |
| 715 | } |
| 716 | default: |
| 717 | return fmt.Errorf("cannot decode %v into an array", vr.Type()) |
| 718 | } |
| 719 | |
| 720 | var elemsFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) ([]reflect.Value, error) |
| 721 | switch val.Type().Elem() { |
| 722 | case tE: |
| 723 | elemsFunc = dvd.decodeD |
| 724 | default: |
| 725 | elemsFunc = dvd.decodeDefault |
| 726 | } |
| 727 | |
| 728 | elems, err := elemsFunc(dc, vr, val) |
| 729 | if err != nil { |
| 730 | return err |
| 731 | } |
| 732 | |
| 733 | if len(elems) > val.Len() { |
| 734 | return fmt.Errorf("more elements returned in array than can fit inside %s", val.Type()) |
| 735 | } |
| 736 | |
| 737 | for idx, elem := range elems { |
| 738 | val.Index(idx).Set(elem) |
| 739 | } |
| 740 | |
| 741 | return nil |
| 742 | } |
| 743 | |
| 744 | // SliceDecodeValue is the ValueDecoderFunc for slice types. |
| 745 | func (dvd DefaultValueDecoders) SliceDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 746 | if !val.CanSet() || val.Kind() != reflect.Slice { |
| 747 | return ValueDecoderError{Name: "SliceDecodeValue", Kinds: []reflect.Kind{reflect.Slice}, Received: val} |
| 748 | } |
| 749 | |
| 750 | switch vr.Type() { |
| 751 | case bsontype.Array: |
| 752 | case bsontype.Null: |
| 753 | val.Set(reflect.Zero(val.Type())) |
| 754 | return vr.ReadNull() |
| 755 | case bsontype.Type(0), bsontype.EmbeddedDocument: |
| 756 | if val.Type().Elem() != tE { |
| 757 | return fmt.Errorf("cannot decode document into %s", val.Type()) |
| 758 | } |
| 759 | default: |
| 760 | return fmt.Errorf("cannot decode %v into a slice", vr.Type()) |
| 761 | } |
| 762 | |
| 763 | var elemsFunc func(DecodeContext, bsonrw.ValueReader, reflect.Value) ([]reflect.Value, error) |
| 764 | switch val.Type().Elem() { |
| 765 | case tE: |
| 766 | dc.Ancestor = val.Type() |
| 767 | elemsFunc = dvd.decodeD |
| 768 | default: |
| 769 | elemsFunc = dvd.decodeDefault |
| 770 | } |
| 771 | |
| 772 | elems, err := elemsFunc(dc, vr, val) |
| 773 | if err != nil { |
| 774 | return err |
| 775 | } |
| 776 | |
| 777 | if val.IsNil() { |
| 778 | val.Set(reflect.MakeSlice(val.Type(), 0, len(elems))) |
| 779 | } |
| 780 | |
| 781 | val.SetLen(0) |
| 782 | val.Set(reflect.Append(val, elems...)) |
| 783 | |
| 784 | return nil |
| 785 | } |
| 786 | |
| 787 | // ValueUnmarshalerDecodeValue is the ValueDecoderFunc for ValueUnmarshaler implementations. |
| 788 | func (dvd DefaultValueDecoders) ValueUnmarshalerDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 789 | if !val.IsValid() || (!val.Type().Implements(tValueUnmarshaler) && !reflect.PtrTo(val.Type()).Implements(tValueUnmarshaler)) { |
| 790 | return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val} |
| 791 | } |
| 792 | |
| 793 | if val.Kind() == reflect.Ptr && val.IsNil() { |
| 794 | if !val.CanSet() { |
| 795 | return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val} |
| 796 | } |
| 797 | val.Set(reflect.New(val.Type().Elem())) |
| 798 | } |
| 799 | |
| 800 | if !val.Type().Implements(tValueUnmarshaler) { |
| 801 | if !val.CanAddr() { |
| 802 | return ValueDecoderError{Name: "ValueUnmarshalerDecodeValue", Types: []reflect.Type{tValueUnmarshaler}, Received: val} |
| 803 | } |
| 804 | val = val.Addr() // If they type doesn't implement the interface, a pointer to it must. |
| 805 | } |
| 806 | |
| 807 | t, src, err := bsonrw.Copier{}.CopyValueToBytes(vr) |
| 808 | if err != nil { |
| 809 | return err |
| 810 | } |
| 811 | |
| 812 | fn := val.Convert(tValueUnmarshaler).MethodByName("UnmarshalBSONValue") |
| 813 | errVal := fn.Call([]reflect.Value{reflect.ValueOf(t), reflect.ValueOf(src)})[0] |
| 814 | if !errVal.IsNil() { |
| 815 | return errVal.Interface().(error) |
| 816 | } |
| 817 | return nil |
| 818 | } |
| 819 | |
| 820 | // UnmarshalerDecodeValue is the ValueDecoderFunc for Unmarshaler implementations. |
| 821 | func (dvd DefaultValueDecoders) UnmarshalerDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 822 | if !val.IsValid() || (!val.Type().Implements(tUnmarshaler) && !reflect.PtrTo(val.Type()).Implements(tUnmarshaler)) { |
| 823 | return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val} |
| 824 | } |
| 825 | |
| 826 | if val.Kind() == reflect.Ptr && val.IsNil() { |
| 827 | if !val.CanSet() { |
| 828 | return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val} |
| 829 | } |
| 830 | val.Set(reflect.New(val.Type().Elem())) |
| 831 | } |
| 832 | |
| 833 | if !val.Type().Implements(tUnmarshaler) { |
| 834 | if !val.CanAddr() { |
| 835 | return ValueDecoderError{Name: "UnmarshalerDecodeValue", Types: []reflect.Type{tUnmarshaler}, Received: val} |
| 836 | } |
| 837 | val = val.Addr() // If they type doesn't implement the interface, a pointer to it must. |
| 838 | } |
| 839 | |
| 840 | _, src, err := bsonrw.Copier{}.CopyValueToBytes(vr) |
| 841 | if err != nil { |
| 842 | return err |
| 843 | } |
| 844 | |
| 845 | fn := val.Convert(tUnmarshaler).MethodByName("UnmarshalBSON") |
| 846 | errVal := fn.Call([]reflect.Value{reflect.ValueOf(src)})[0] |
| 847 | if !errVal.IsNil() { |
| 848 | return errVal.Interface().(error) |
| 849 | } |
| 850 | return nil |
| 851 | } |
| 852 | |
| 853 | // EmptyInterfaceDecodeValue is the ValueDecoderFunc for interface{}. |
| 854 | func (dvd DefaultValueDecoders) EmptyInterfaceDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 855 | if !val.CanSet() || val.Type() != tEmpty { |
| 856 | return ValueDecoderError{Name: "EmptyInterfaceDecodeValue", Types: []reflect.Type{tEmpty}, Received: val} |
| 857 | } |
| 858 | |
| 859 | rtype, err := dc.LookupTypeMapEntry(vr.Type()) |
| 860 | if err != nil { |
| 861 | switch vr.Type() { |
| 862 | case bsontype.EmbeddedDocument: |
| 863 | if dc.Ancestor != nil { |
| 864 | rtype = dc.Ancestor |
| 865 | break |
| 866 | } |
| 867 | rtype = tD |
| 868 | case bsontype.Null: |
| 869 | val.Set(reflect.Zero(val.Type())) |
| 870 | return vr.ReadNull() |
| 871 | default: |
| 872 | return err |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | decoder, err := dc.LookupDecoder(rtype) |
| 877 | if err != nil { |
| 878 | return err |
| 879 | } |
| 880 | |
| 881 | elem := reflect.New(rtype).Elem() |
| 882 | err = decoder.DecodeValue(dc, vr, elem) |
| 883 | if err != nil { |
| 884 | return err |
| 885 | } |
| 886 | |
| 887 | val.Set(elem) |
| 888 | return nil |
| 889 | } |
| 890 | |
| 891 | // CoreDocumentDecodeValue is the ValueDecoderFunc for bsoncore.Document. |
| 892 | func (DefaultValueDecoders) CoreDocumentDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 893 | if !val.CanSet() || val.Type() != tCoreDocument { |
| 894 | return ValueDecoderError{Name: "CoreDocumentDecodeValue", Types: []reflect.Type{tCoreDocument}, Received: val} |
| 895 | } |
| 896 | |
| 897 | if val.IsNil() { |
| 898 | val.Set(reflect.MakeSlice(val.Type(), 0, 0)) |
| 899 | } |
| 900 | |
| 901 | val.SetLen(0) |
| 902 | |
| 903 | cdoc, err := bsonrw.Copier{}.AppendDocumentBytes(val.Interface().(bsoncore.Document), vr) |
| 904 | val.Set(reflect.ValueOf(cdoc)) |
| 905 | return err |
| 906 | } |
| 907 | |
| 908 | func (dvd DefaultValueDecoders) decodeDefault(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) ([]reflect.Value, error) { |
| 909 | elems := make([]reflect.Value, 0) |
| 910 | |
| 911 | ar, err := vr.ReadArray() |
| 912 | if err != nil { |
| 913 | return nil, err |
| 914 | } |
| 915 | |
| 916 | eType := val.Type().Elem() |
| 917 | |
| 918 | decoder, err := dc.LookupDecoder(eType) |
| 919 | if err != nil { |
| 920 | return nil, err |
| 921 | } |
| 922 | |
| 923 | for { |
| 924 | vr, err := ar.ReadValue() |
| 925 | if err == bsonrw.ErrEOA { |
| 926 | break |
| 927 | } |
| 928 | if err != nil { |
| 929 | return nil, err |
| 930 | } |
| 931 | |
| 932 | elem := reflect.New(eType).Elem() |
| 933 | |
| 934 | err = decoder.DecodeValue(dc, vr, elem) |
| 935 | if err != nil { |
| 936 | return nil, err |
| 937 | } |
| 938 | elems = append(elems, elem) |
| 939 | } |
| 940 | |
| 941 | return elems, nil |
| 942 | } |
| 943 | |
| 944 | // CodeWithScopeDecodeValue is the ValueDecoderFunc for CodeWithScope. |
| 945 | func (dvd DefaultValueDecoders) CodeWithScopeDecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 946 | if !val.CanSet() || val.Type() != tCodeWithScope { |
| 947 | return ValueDecoderError{Name: "CodeWithScopeDecodeValue", Types: []reflect.Type{tCodeWithScope}, Received: val} |
| 948 | } |
| 949 | |
| 950 | if vr.Type() != bsontype.CodeWithScope { |
| 951 | return fmt.Errorf("cannot decode %v into a primitive.CodeWithScope", vr.Type()) |
| 952 | } |
| 953 | |
| 954 | code, dr, err := vr.ReadCodeWithScope() |
| 955 | if err != nil { |
| 956 | return err |
| 957 | } |
| 958 | |
| 959 | scope := reflect.New(tD).Elem() |
| 960 | |
| 961 | elems, err := dvd.decodeElemsFromDocumentReader(dc, dr) |
| 962 | if err != nil { |
| 963 | return err |
| 964 | } |
| 965 | |
| 966 | scope.Set(reflect.MakeSlice(tD, 0, len(elems))) |
| 967 | scope.Set(reflect.Append(scope, elems...)) |
| 968 | |
| 969 | val.Set(reflect.ValueOf(primitive.CodeWithScope{Code: primitive.JavaScript(code), Scope: scope.Interface().(primitive.D)})) |
| 970 | return nil |
| 971 | } |
| 972 | |
| 973 | func (dvd DefaultValueDecoders) decodeD(dc DecodeContext, vr bsonrw.ValueReader, _ reflect.Value) ([]reflect.Value, error) { |
| 974 | switch vr.Type() { |
| 975 | case bsontype.Type(0), bsontype.EmbeddedDocument: |
| 976 | default: |
| 977 | return nil, fmt.Errorf("cannot decode %v into a D", vr.Type()) |
| 978 | } |
| 979 | |
| 980 | dr, err := vr.ReadDocument() |
| 981 | if err != nil { |
| 982 | return nil, err |
| 983 | } |
| 984 | |
| 985 | return dvd.decodeElemsFromDocumentReader(dc, dr) |
| 986 | } |
| 987 | |
| 988 | func (DefaultValueDecoders) decodeElemsFromDocumentReader(dc DecodeContext, dr bsonrw.DocumentReader) ([]reflect.Value, error) { |
| 989 | decoder, err := dc.LookupDecoder(tEmpty) |
| 990 | if err != nil { |
| 991 | return nil, err |
| 992 | } |
| 993 | |
| 994 | elems := make([]reflect.Value, 0) |
| 995 | for { |
| 996 | key, vr, err := dr.ReadElement() |
| 997 | if err == bsonrw.ErrEOD { |
| 998 | break |
| 999 | } |
| 1000 | if err != nil { |
| 1001 | return nil, err |
| 1002 | } |
| 1003 | |
| 1004 | val := reflect.New(tEmpty).Elem() |
| 1005 | err = decoder.DecodeValue(dc, vr, val) |
| 1006 | if err != nil { |
| 1007 | return nil, err |
| 1008 | } |
| 1009 | |
| 1010 | elems = append(elems, reflect.ValueOf(primitive.E{Key: key, Value: val.Interface()})) |
| 1011 | } |
| 1012 | |
| 1013 | return elems, nil |
| 1014 | } |