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bson.go
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bson.go
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// Copyright 2023 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mongo
import (
"fmt"
"reflect"
"github.com/google/uuid"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/bsoncodec"
"go.mongodb.org/mongo-driver/bson/bsonrw"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
var (
tUUID = reflect.TypeOf(uuid.UUID{})
)
func init() {
bson.DefaultRegistry = bson.NewRegistryBuilder().
RegisterCodec(tUUID, UUIDCodec{}).
Build()
}
type UUIDCodec struct{}
func (codec UUIDCodec) RegisterCodec(rb *bsoncodec.RegistryBuilder) *bsoncodec.RegistryBuilder {
return rb.RegisterCodec(tUUID, codec)
}
func (UUIDCodec) EncodeValue(
ec bsoncodec.EncodeContext,
w bsonrw.ValueWriter,
val reflect.Value,
) error {
if !val.IsValid() || val.Type() != tUUID {
return bsoncodec.ValueEncoderError{
Name: "UUIDCodec",
Types: []reflect.Type{tUUID},
Received: val,
}
}
uid := val.Interface().(uuid.UUID)
return w.WriteBinaryWithSubtype(uid[:], bsontype.BinaryUUID)
}
func (UUIDCodec) DecodeValue(
ec bsoncodec.DecodeContext,
r bsonrw.ValueReader,
val reflect.Value,
) error {
if !val.CanSet() || val.Type() != tUUID {
return bsoncodec.ValueDecoderError{
Name: "UUIDCodec",
Types: []reflect.Type{tUUID},
Received: val,
}
}
var (
data []byte
err error
subtype byte
uid uuid.UUID = uuid.Nil
)
switch rType := r.Type(); rType {
case bsontype.Binary:
data, subtype, err = r.ReadBinary()
switch subtype {
case bsontype.BinaryGeneric:
if len(data) != 16 {
return fmt.Errorf(
"cannot decode %v as a UUID: "+
"incorrect length: %d",
data, len(data),
)
}
fallthrough
case bsontype.BinaryUUID, bsontype.BinaryUUIDOld:
copy(uid[:], data)
default:
err = fmt.Errorf(
"cannot decode %v as a UUID: "+
"incorrect subtype 0x%02x",
data, subtype,
)
}
case bsontype.Undefined:
err = r.ReadUndefined()
case bsontype.Null:
err = r.ReadNull()
default:
err = fmt.Errorf("cannot decode %v as a UUID", rType)
}
if err != nil {
return err
}
val.Set(reflect.ValueOf(uid))
return nil
}