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// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package mgocompat
import (
"errors"
"reflect"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/bsoncodec"
"go.mongodb.org/mongo-driver/bson/bsonoptions"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
var (
// ErrSetZero may be returned from a SetBSON method to have the value set to its respective zero value.
ErrSetZero = errors.New("set to zero")
tInt = reflect.TypeOf(int(0))
tTime = reflect.TypeOf(time.Time{})
tM = reflect.TypeOf(bson.M{})
tInterfaceSlice = reflect.TypeOf([]interface{}{})
tByteSlice = reflect.TypeOf([]byte{})
tEmpty = reflect.TypeOf((*interface{})(nil)).Elem()
tGetter = reflect.TypeOf((*Getter)(nil)).Elem()
tSetter = reflect.TypeOf((*Setter)(nil)).Elem()
)
// Registry is the mgo compatible bsoncodec.Registry. It contains the default and
// primitive codecs with mgo compatible options.
var Registry = NewRegistryBuilder().Build()
// RegistryRespectNilValues is the bsoncodec.Registry compatible with mgo withSetRespectNilValues set to true.
var RegistryRespectNilValues = NewRespectNilValuesRegistryBuilder().Build()
// NewRegistryBuilder creates a new bsoncodec.RegistryBuilder configured with the default encoders and
// deocders from the bsoncodec.DefaultValueEncoders and bsoncodec.DefaultValueDecoders types and the
// PrimitiveCodecs type in this package.
func NewRegistryBuilder() *bsoncodec.RegistryBuilder {
rb := bsoncodec.NewRegistryBuilder()
bsoncodec.DefaultValueEncoders{}.RegisterDefaultEncoders(rb)
bsoncodec.DefaultValueDecoders{}.RegisterDefaultDecoders(rb)
bson.PrimitiveCodecs{}.RegisterPrimitiveCodecs(rb)
structcodec, _ := bsoncodec.NewStructCodec(bsoncodec.DefaultStructTagParser,
bsonoptions.StructCodec().
SetDecodeZeroStruct(true).
SetEncodeOmitDefaultStruct(true).
SetOverwriteDuplicatedInlinedFields(false).
SetAllowUnexportedFields(true))
emptyInterCodec := bsoncodec.NewEmptyInterfaceCodec(
bsonoptions.EmptyInterfaceCodec().
SetDecodeBinaryAsSlice(true))
mapCodec := bsoncodec.NewMapCodec(
bsonoptions.MapCodec().
SetDecodeZerosMap(true).
SetEncodeNilAsEmpty(true).
SetEncodeKeysWithStringer(true))
uintcodec := bsoncodec.NewUIntCodec(bsonoptions.UIntCodec().SetEncodeToMinSize(true))
rb.RegisterTypeDecoder(tEmpty, emptyInterCodec).
RegisterDefaultDecoder(reflect.String, bsoncodec.NewStringCodec(bsonoptions.StringCodec().SetDecodeObjectIDAsHex(false))).
RegisterDefaultDecoder(reflect.Struct, structcodec).
RegisterDefaultDecoder(reflect.Map, mapCodec).
RegisterTypeEncoder(tByteSlice, bsoncodec.NewByteSliceCodec(bsonoptions.ByteSliceCodec().SetEncodeNilAsEmpty(true))).
RegisterDefaultEncoder(reflect.Struct, structcodec).
RegisterDefaultEncoder(reflect.Slice, bsoncodec.NewSliceCodec(bsonoptions.SliceCodec().SetEncodeNilAsEmpty(true))).
RegisterDefaultEncoder(reflect.Map, mapCodec).
RegisterDefaultEncoder(reflect.Uint, uintcodec).
RegisterDefaultEncoder(reflect.Uint8, uintcodec).
RegisterDefaultEncoder(reflect.Uint16, uintcodec).
RegisterDefaultEncoder(reflect.Uint32, uintcodec).
RegisterDefaultEncoder(reflect.Uint64, uintcodec).
RegisterTypeMapEntry(bsontype.Int32, tInt).
RegisterTypeMapEntry(bsontype.DateTime, tTime).
RegisterTypeMapEntry(bsontype.Array, tInterfaceSlice).
RegisterTypeMapEntry(bsontype.Type(0), tM).
RegisterTypeMapEntry(bsontype.EmbeddedDocument, tM).
RegisterHookEncoder(tGetter, bsoncodec.ValueEncoderFunc(GetterEncodeValue)).
RegisterHookDecoder(tSetter, bsoncodec.ValueDecoderFunc(SetterDecodeValue))
return rb
}
// NewRespectNilValuesRegistryBuilder creates a new bsoncodec.RegistryBuilder configured to behave like mgo/bson
// with RespectNilValues set to true.
func NewRespectNilValuesRegistryBuilder() *bsoncodec.RegistryBuilder {
rb := NewRegistryBuilder()
structcodec, _ := bsoncodec.NewStructCodec(bsoncodec.DefaultStructTagParser,
bsonoptions.StructCodec().
SetDecodeZeroStruct(true).
SetEncodeOmitDefaultStruct(true).
SetOverwriteDuplicatedInlinedFields(false).
SetAllowUnexportedFields(true))
mapCodec := bsoncodec.NewMapCodec(
bsonoptions.MapCodec().
SetDecodeZerosMap(true).
SetEncodeNilAsEmpty(false))
rb.RegisterDefaultDecoder(reflect.Struct, structcodec).
RegisterDefaultDecoder(reflect.Map, mapCodec).
RegisterTypeEncoder(tByteSlice, bsoncodec.NewByteSliceCodec(bsonoptions.ByteSliceCodec().SetEncodeNilAsEmpty(false))).
RegisterDefaultEncoder(reflect.Struct, structcodec).
RegisterDefaultEncoder(reflect.Slice, bsoncodec.NewSliceCodec(bsonoptions.SliceCodec().SetEncodeNilAsEmpty(false))).
RegisterDefaultEncoder(reflect.Map, mapCodec)
return rb
}
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