github.com/kaydxh/golang@v0.0.131/pkg/viper/unmarshaler.go (about)

     1  /*
     2   *Copyright (c) 2022, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package viper
    23  
    24  import (
    25  	"encoding/json"
    26  	"fmt"
    27  	"reflect"
    28  
    29  	jsonpb_ "github.com/kaydxh/golang/pkg/protobuf/jsonpb"
    30  	"github.com/mitchellh/mapstructure"
    31  	"google.golang.org/protobuf/proto"
    32  
    33  	"github.com/spf13/viper"
    34  )
    35  
    36  func UnmarshalProtoMessageWithJsonPb(v *viper.Viper, msg proto.Message, options ...viper.DecoderConfigOption) error {
    37  	if v == nil {
    38  		return fmt.Errorf("viper is nil")
    39  	}
    40  
    41  	var opts []viper.DecoderConfigOption
    42  	opts = append(opts, func(decoderConfig *mapstructure.DecoderConfig) {
    43  		decoderConfig.TagName = "json" // trick of protobuf, which generates json tag only
    44  		decoderConfig.WeaklyTypedInput = true
    45  		decoderConfig.DecodeHook = UnmarshalProtoMessageWithJsonpbHookFunc(msg)
    46  	})
    47  	opts = append(opts, options...)
    48  	return v.Unmarshal(msg, opts...)
    49  }
    50  
    51  func UnmarshalProtoMessageWithJsonpbHookFunc(v proto.Message) mapstructure.DecodeHookFunc {
    52  	return func(src reflect.Type, dst reflect.Type, data interface{}) (interface{}, error) {
    53  		// Convert it by parsing
    54  		dataBytes, err := json.Marshal(data)
    55  		if err != nil {
    56  			return nil, err
    57  		}
    58  
    59  		err = jsonpb_.UnmarshalWithAllowUnknownFields(dataBytes, v)
    60  		if err != nil {
    61  			return data, err
    62  		}
    63  
    64  		return v, nil
    65  	}
    66  }