json_filter/filter.go

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// Package filter ...
//
// Description : filter ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2022-07-04 17:47
package filter
import (
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"encoding/json"
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"fmt"
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"git.zhangdeman.cn/zhangdeman/consts"
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"git.zhangdeman.cn/zhangdeman/wrapper"
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"strings"
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"github.com/tidwall/gjson"
"github.com/tidwall/sjson"
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"errors"
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)
// NewFilter 过滤器实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:54 2022/7/4
func NewFilter(sourceData string, filterRuleList []MapRule) *filter {
return &filter{
sourceData: sourceData,
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formatResult: "{}",
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filterRuleList: filterRuleList,
}
}
// filter 数据过滤
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:58 2022/7/4
type filter struct {
sourceData string
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formatResult string
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filterRuleList []MapRule
}
// Deal ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:59 2022/7/4
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func (f *filter) Deal() error {
var (
err error
formatVal interface{}
)
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for _, rule := range f.filterRuleList {
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if f.IsArray(rule) {
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// 对于list的处理
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if err = f.handleArray(rule); nil != err {
return err
}
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continue
}
sourceResult := gjson.Get(f.sourceData, rule.SourcePath)
if formatVal, err = f.getValue(rule.DataType, sourceResult, rule.DefaultValue); nil != err {
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return fmt.Errorf("%s = %v can not convert to %s : %s", rule.SourcePath, sourceResult.Value(), rule.DataType, err.Error())
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}
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if f.formatResult, err = sjson.Set(f.formatResult, rule.MapPath, formatVal); nil != err {
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return err
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}
}
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return nil
}
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// IsArray 判断是否为数组
//
// Author : zhangdeman001@ke.com<张德满>
//
// Date : 17:48 2023/1/1
func (f *filter) IsArray(rule MapRule) bool {
return strings.Contains(rule.SourcePath, "[]")
}
// handleArray 处理数组(最复杂的场景)
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:41 2023/1/1
func (f *filter) handleArray(rule MapRule) error {
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var (
err error
)
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sourcePathArray := strings.Split(rule.SourcePath, "[]")
for idx, item := range sourcePathArray {
sourcePathArray[idx] = strings.Trim(item, ".")
}
mapPathArray := strings.Split(strings.TrimRight(rule.MapPath, ".[]"), "[]")
for idx, item := range mapPathArray {
mapPathArray[idx] = strings.Trim(item, ".")
}
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if len(sourcePathArray) != len(mapPathArray) {
if len(mapPathArray) != 1 {
return errors.New("map rule is invalid")
}
// 提取某一个list下的字段, 组成一个list
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res := make([]string, 0)
if len(sourcePathArray[0]) == 0 {
f.getAllFinalData(&res, gjson.Parse(f.sourceData).Array(), sourcePathArray[1:])
} else {
f.getAllFinalData(&res, gjson.Get(f.sourceData, sourcePathArray[0]).Array(), sourcePathArray[1:])
}
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if f.formatResult, err = sjson.Set(f.formatResult, mapPathArray[0], res); nil != err {
return err
}
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return nil
}
return nil
}
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// extraFinalResult 提取全部最底层结果
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//
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// Author : zhangdeman001@ke.com<张德满>
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//
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// Date : 14:00 2023/1/2
func (f *filter) getAllFinalData(res *[]string, resultList []gjson.Result, pathArr []string) {
if len(pathArr) == 1 {
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for _, item := range resultList {
*res = append(*res, item.Get(pathArr[0]).String())
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}
return
}
for _, item := range resultList {
f.getAllFinalData(res, item.Array(), pathArr[1:])
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}
return
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}
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// String 获取格式化之后的字符串
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:18 2022/12/31
func (f *filter) String() string {
return f.formatResult
}
// Byte 获取格式化之后的字节数组
//
// Author : zhangdeman001@ke.com<张德满>
//
// Date : 21:18 2022/12/31
func (f *filter) Byte() []byte {
return []byte(f.String())
}
// Parse 解析返回结果
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:20 2022/12/31
func (f *filter) Parse(receiver interface{}) error {
if nil == receiver {
return errors.New("receiver is nil")
}
return json.Unmarshal(f.Byte(), receiver)
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}
// getValue 获取值
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:25 2022/7/4
func (f *filter) getValue(dataType string, sourceValue gjson.Result, defaultValue string) (interface{}, error) {
sourceValueStr := defaultValue
if sourceValue.Exists() {
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str := sourceValue.String()
if len(str) > 0 {
sourceValueStr = str
}
}
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strVal := wrapper.String(sourceValueStr)
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switch dataType {
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case consts.DataTypeInt:
intVal := strVal.ToInt()
return intVal.Value, intVal.Err
case consts.DataTypeUint:
uintVal := strVal.ToUint64()
return uintVal.Value, uintVal.Err
case consts.DataTypeBool:
boolVal := strVal.ToBool()
return boolVal.Value, boolVal.Err
case consts.DataTypeFloat:
floatVal := strVal.ToFloat64()
return floatVal.Value, floatVal.Err
case consts.DataTypeString:
return strVal.Value(), nil
case consts.DataTypeAny:
if sourceValue.Exists() {
return sourceValue.Value(), nil
}
return defaultValue, nil
case consts.DataTypeSliceAny:
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// 任意类型的list
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sliceVal := strVal.ToAnySlice()
return sliceVal.Value, sliceVal.Err
case consts.DataTypeMapStrAny:
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// object
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objectVal := strVal.ToObject()
return objectVal.Value, objectVal.Err
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default:
return nil, errors.New(dataType + " is not support!")
}
}