mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-18 18:43:26 +02:00
207 lines
5.3 KiB
Go
207 lines
5.3 KiB
Go
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// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package bsoncodec
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import (
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"fmt"
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"reflect"
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"strconv"
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"go.mongodb.org/mongo-driver/bson/bsonoptions"
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"go.mongodb.org/mongo-driver/bson/bsonrw"
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"go.mongodb.org/mongo-driver/bson/bsontype"
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)
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var defaultMapCodec = NewMapCodec()
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// MapCodec is the Codec used for map values.
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type MapCodec struct {
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DecodeZerosMap bool
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EncodeNilAsEmpty bool
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}
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var _ ValueCodec = &MapCodec{}
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// NewMapCodec returns a MapCodec with options opts.
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func NewMapCodec(opts ...*bsonoptions.MapCodecOptions) *MapCodec {
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mapOpt := bsonoptions.MergeMapCodecOptions(opts...)
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codec := MapCodec{}
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if mapOpt.DecodeZerosMap != nil {
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codec.DecodeZerosMap = *mapOpt.DecodeZerosMap
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}
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if mapOpt.EncodeNilAsEmpty != nil {
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codec.EncodeNilAsEmpty = *mapOpt.EncodeNilAsEmpty
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}
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return &codec
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}
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// EncodeValue is the ValueEncoder for map[*]* types.
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func (mc *MapCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
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if !val.IsValid() || val.Kind() != reflect.Map {
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return ValueEncoderError{Name: "MapEncodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val}
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}
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if val.IsNil() && !mc.EncodeNilAsEmpty {
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// If we have a nil map but we can't WriteNull, that means we're probably trying to encode
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// to a TopLevel document. We can't currently tell if this is what actually happened, but if
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// there's a deeper underlying problem, the error will also be returned from WriteDocument,
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// so just continue. The operations on a map reflection value are valid, so we can call
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// MapKeys within mapEncodeValue without a problem.
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err := vw.WriteNull()
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if err == nil {
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return nil
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}
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}
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dw, err := vw.WriteDocument()
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if err != nil {
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return err
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}
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return mc.mapEncodeValue(ec, dw, val, nil)
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}
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// mapEncodeValue handles encoding of the values of a map. The collisionFn returns
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// true if the provided key exists, this is mainly used for inline maps in the
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// struct codec.
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func (mc *MapCodec) mapEncodeValue(ec EncodeContext, dw bsonrw.DocumentWriter, val reflect.Value, collisionFn func(string) bool) error {
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elemType := val.Type().Elem()
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encoder, err := ec.LookupEncoder(elemType)
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if err != nil && elemType.Kind() != reflect.Interface {
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return err
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}
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keys := val.MapKeys()
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for _, key := range keys {
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keyStr := fmt.Sprint(key)
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if collisionFn != nil && collisionFn(keyStr) {
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return fmt.Errorf("Key %s of inlined map conflicts with a struct field name", key)
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}
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currEncoder, currVal, lookupErr := defaultValueEncoders.lookupElementEncoder(ec, encoder, val.MapIndex(key))
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if lookupErr != nil && lookupErr != errInvalidValue {
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return lookupErr
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}
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vw, err := dw.WriteDocumentElement(keyStr)
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if err != nil {
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return err
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}
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if lookupErr == errInvalidValue {
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err = vw.WriteNull()
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if err != nil {
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return err
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}
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continue
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}
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if enc, ok := currEncoder.(ValueEncoder); ok {
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err = enc.EncodeValue(ec, vw, currVal)
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if err != nil {
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return err
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}
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continue
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}
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err = encoder.EncodeValue(ec, vw, currVal)
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if err != nil {
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return err
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}
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}
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return dw.WriteDocumentEnd()
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}
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// DecodeValue is the ValueDecoder for map[string/decimal]* types.
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func (mc *MapCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
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if val.Kind() != reflect.Map || (!val.CanSet() && val.IsNil()) {
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return ValueDecoderError{Name: "MapDecodeValue", Kinds: []reflect.Kind{reflect.Map}, Received: val}
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}
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switch vrType := vr.Type(); vrType {
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case bsontype.Type(0), bsontype.EmbeddedDocument:
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case bsontype.Null:
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val.Set(reflect.Zero(val.Type()))
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return vr.ReadNull()
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default:
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return fmt.Errorf("cannot decode %v into a %s", vrType, val.Type())
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}
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dr, err := vr.ReadDocument()
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if err != nil {
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return err
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}
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if val.IsNil() {
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val.Set(reflect.MakeMap(val.Type()))
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}
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if val.Len() > 0 && mc.DecodeZerosMap {
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clearMap(val)
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}
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eType := val.Type().Elem()
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decoder, err := dc.LookupDecoder(eType)
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if err != nil {
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return err
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}
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if eType == tEmpty {
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dc.Ancestor = val.Type()
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}
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keyType := val.Type().Key()
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keyKind := keyType.Kind()
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for {
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key, vr, err := dr.ReadElement()
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if err == bsonrw.ErrEOD {
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break
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}
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if err != nil {
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return err
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}
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k := reflect.ValueOf(key)
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if keyType != tString {
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switch keyKind {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
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reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
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reflect.Float32, reflect.Float64:
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parsed, err := strconv.ParseFloat(k.String(), 64)
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if err != nil {
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return fmt.Errorf("Map key is defined to be a decimal type (%v) but got error %v", keyKind, err)
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}
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k = reflect.ValueOf(parsed)
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case reflect.String: // if keyType wraps string
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default:
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return fmt.Errorf("BSON map must have string or decimal keys. Got:%v", val.Type())
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}
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k = k.Convert(keyType)
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}
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elem := reflect.New(eType).Elem()
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err = decoder.DecodeValue(dc, vr, elem)
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if err != nil {
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return err
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}
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val.SetMapIndex(k, elem)
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}
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return nil
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}
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func clearMap(m reflect.Value) {
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var none reflect.Value
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for _, k := range m.MapKeys() {
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m.SetMapIndex(k, none)
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}
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}
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