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backend.go
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backend.go
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package specs
import (
"bytes"
"encoding/json"
"fmt"
)
type Backend int
const (
BackendNone Backend = iota
BackendLocal
)
var AllBackends = Backends{BackendNone, BackendLocal}
var AllBackendNames = [...]string{
BackendNone: "none",
BackendLocal: "local",
}
type Backends []Backend
func (s Backends) String() string {
var buffer bytes.Buffer
for i, backend := range s {
if i > 0 {
buffer.WriteString(", ")
}
buffer.WriteString(backend.String())
}
return buffer.String()
}
func (s Backend) String() string {
return AllBackendNames[s]
}
func (s Backend) MarshalJSON() ([]byte, error) {
return []byte(`"` + s.String() + `"`), nil
}
func (s *Backend) UnmarshalJSON(data []byte) (err error) {
var backend string
if err := json.Unmarshal(data, &backend); err != nil {
return err
}
if *s, err = BackendFromString(backend); err != nil {
return err
}
return nil
}
func BackendFromString(s string) (Backend, error) {
for i, backend := range AllBackendNames {
if s == backend {
return Backend(i), nil
}
}
return BackendNone, fmt.Errorf("unknown backend %s", s)
}