go.etcd.io/etcd@v3.3.27+incompatible/client/json.go (about)

     1  // Copyright 2019 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package client
    16  
    17  import (
    18  	"github.com/json-iterator/go"
    19  	"github.com/modern-go/reflect2"
    20  	"strconv"
    21  	"unsafe"
    22  )
    23  
    24  type customNumberExtension struct {
    25  	jsoniter.DummyExtension
    26  }
    27  
    28  func (cne *customNumberExtension) CreateDecoder(typ reflect2.Type) jsoniter.ValDecoder {
    29  	if typ.String() == "interface {}" {
    30  		return customNumberDecoder{}
    31  	}
    32  	return nil
    33  }
    34  
    35  type customNumberDecoder struct {
    36  }
    37  
    38  func (customNumberDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
    39  	switch iter.WhatIsNext() {
    40  	case jsoniter.NumberValue:
    41  		var number jsoniter.Number
    42  		iter.ReadVal(&number)
    43  		i64, err := strconv.ParseInt(string(number), 10, 64)
    44  		if err == nil {
    45  			*(*interface{})(ptr) = i64
    46  			return
    47  		}
    48  		f64, err := strconv.ParseFloat(string(number), 64)
    49  		if err == nil {
    50  			*(*interface{})(ptr) = f64
    51  			return
    52  		}
    53  		iter.ReportError("DecodeNumber", err.Error())
    54  	default:
    55  		*(*interface{})(ptr) = iter.Read()
    56  	}
    57  }
    58  
    59  // caseSensitiveJsonIterator returns a jsoniterator API that's configured to be
    60  // case-sensitive when unmarshalling, and otherwise compatible with
    61  // the encoding/json standard library.
    62  func caseSensitiveJsonIterator() jsoniter.API {
    63  	config := jsoniter.Config{
    64  		EscapeHTML:             true,
    65  		SortMapKeys:            true,
    66  		ValidateJsonRawMessage: true,
    67  		CaseSensitive:          true,
    68  	}.Froze()
    69  	// Force jsoniter to decode number to interface{} via int64/float64, if possible.
    70  	config.RegisterExtension(&customNumberExtension{})
    71  	return config
    72  }