66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
package main
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import (
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"reflect"
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"strconv"
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"strings"
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"time"
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"github.com/pkg/errors"
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)
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func fieldsToMap(in interface{}) (map[string]string, error) {
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if reflect.TypeOf(in).Kind() != reflect.Ptr {
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return nil, errors.New("Non-pointer given")
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}
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if kind := reflect.ValueOf(in).Elem().Kind(); kind != reflect.Struct {
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return nil, errors.Errorf("Non-struct given: %s", kind)
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}
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var out = map[string]string{}
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st := reflect.ValueOf(in).Elem()
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for i := 0; i < st.NumField(); i++ {
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valField := st.Field(i)
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typeField := st.Type().Field(i)
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jsonTag := strings.Split(typeField.Tag.Get("json"), ",")[0]
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if jsonTag == "" {
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// Empty tag, skip
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continue
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}
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switch typeField.Type {
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case reflect.TypeOf(time.Time{}):
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out[jsonTag] = valField.Addr().Interface().(*time.Time).String()
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continue
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}
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switch typeField.Type.Kind() {
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case reflect.Bool:
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out[jsonTag] = strconv.FormatBool(valField.Bool())
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case reflect.Int, reflect.Int64:
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out[jsonTag] = strconv.FormatInt(valField.Int(), 10)
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case reflect.String:
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out[jsonTag] = valField.String()
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case reflect.Slice:
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switch typeField.Type.Elem().Kind() {
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case reflect.String:
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res := valField.Addr().Interface().(*[]string)
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out[jsonTag] = strings.Join(*res, "\n")
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}
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default:
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return nil, errors.Errorf("Unhandled field type: %s", typeField.Type.String())
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}
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}
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return out, nil
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}
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