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value.go
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/
value.go
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package config
import (
"encoding/json"
"fmt"
"reflect"
"strconv"
"sync/atomic"
"time"
)
var (
_ Value = (*atomicValue)(nil)
_ Value = (*errValue)(nil)
)
// Value is config value interface.
type Value interface {
Bool() (bool, error)
Int() (int64, error)
Float() (float64, error)
String() (string, error)
Duration() (time.Duration, error)
Slice() ([]Value, error)
Map() (map[string]Value, error)
Scan(interface{}) error
Load() interface{}
Store(interface{})
}
type atomicValue struct {
atomic.Value
}
func (v *atomicValue) typeAssertError() error {
return fmt.Errorf("type assert to %v failed", reflect.TypeOf(v.Load()))
}
func (v *atomicValue) Bool() (bool, error) {
switch val := v.Load().(type) {
case bool:
return val, nil
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64, string:
return strconv.ParseBool(fmt.Sprint(val))
}
return false, v.typeAssertError()
}
func (v *atomicValue) Int() (int64, error) {
switch val := v.Load().(type) {
case int:
return int64(val), nil
case int8:
return int64(val), nil
case int16:
return int64(val), nil
case int32:
return int64(val), nil
case int64:
return val, nil
case uint:
return int64(val), nil
case uint8:
return int64(val), nil
case uint16:
return int64(val), nil
case uint32:
return int64(val), nil
case uint64:
return int64(val), nil
case float32:
return int64(val), nil
case float64:
return int64(val), nil
case string:
return strconv.ParseInt(val, 10, 64)
}
return 0, v.typeAssertError()
}
func (v *atomicValue) Slice() ([]Value, error) {
vals, ok := v.Load().([]interface{})
if !ok {
return nil, v.typeAssertError()
}
slices := make([]Value, 0, len(vals))
for _, val := range vals {
a := new(atomicValue)
a.Store(val)
slices = append(slices, a)
}
return slices, nil
}
func (v *atomicValue) Map() (map[string]Value, error) {
vals, ok := v.Load().(map[string]interface{})
if !ok {
return nil, v.typeAssertError()
}
m := make(map[string]Value, len(vals))
for key, val := range vals {
a := new(atomicValue)
a.Store(val)
m[key] = a
}
return m, nil
}
func (v *atomicValue) Float() (float64, error) {
switch val := v.Load().(type) {
case int:
return float64(val), nil
case int8:
return float64(val), nil
case int16:
return float64(val), nil
case int32:
return float64(val), nil
case int64:
return float64(val), nil
case uint:
return float64(val), nil
case uint8:
return float64(val), nil
case uint16:
return float64(val), nil
case uint32:
return float64(val), nil
case uint64:
return float64(val), nil
case float32:
return float64(val), nil
case float64:
return val, nil
case string:
return strconv.ParseFloat(val, 64)
}
return 0.0, v.typeAssertError()
}
func (v *atomicValue) String() (string, error) {
switch val := v.Load().(type) {
case string:
return val, nil
case bool, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64:
return fmt.Sprint(val), nil
case []byte:
return string(val), nil
case fmt.Stringer:
return val.String(), nil
}
return "", v.typeAssertError()
}
func (v *atomicValue) Duration() (time.Duration, error) {
val, err := v.Int()
if err != nil {
return 0, err
}
return time.Duration(val), nil
}
func (v *atomicValue) Scan(obj interface{}) error {
data, err := json.Marshal(v.Load())
if err != nil {
return err
}
return json.Unmarshal(data, obj)
}
type errValue struct {
err error
}
func (v errValue) Bool() (bool, error) { return false, v.err }
func (v errValue) Int() (int64, error) { return 0, v.err }
func (v errValue) Float() (float64, error) { return 0.0, v.err }
func (v errValue) Duration() (time.Duration, error) { return 0, v.err }
func (v errValue) String() (string, error) { return "", v.err }
func (v errValue) Scan(interface{}) error { return v.err }
func (v errValue) Load() interface{} { return nil }
func (v errValue) Store(interface{}) {}
func (v errValue) Slice() ([]Value, error) { return nil, v.err }
func (v errValue) Map() (map[string]Value, error) { return nil, v.err }