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duration.go
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/
duration.go
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package config
import (
"encoding/json"
"errors"
"time"
)
// Duration is a wrapper around time.Duration that enables Json Marshalling capabilities
type Duration struct {
time.Duration
}
func (d Duration) MarshalJSON() ([]byte, error) {
return json.Marshal(d.String())
}
func (d *Duration) UnmarshalJSON(b []byte) error {
if len(b) == 0 {
d.Duration = time.Duration(0)
return nil
}
var v interface{}
if err := json.Unmarshal(b, &v); err != nil {
return err
}
switch value := v.(type) {
case float64:
d.Duration = time.Duration(value)
return nil
case string:
if len(value) == 0 {
d.Duration = time.Duration(0)
} else {
var err error
d.Duration, err = time.ParseDuration(value)
if err != nil {
return err
}
}
default:
return errors.New("invalid duration")
}
return nil
}
// Set implements PFlag's Value interface's set method to set the value of duration from string.
func (d *Duration) Set(val string) error {
var err error
d.Duration, err = time.ParseDuration(val)
return err
}
// Type implements PFlag's Value interface's Type method to return the name of the type.
func (Duration) Type() string {
return "Duration"
}