shad-go/distbuild/pkg/build/id.go

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2020-03-28 21:34:09 +00:00
package build
import (
"crypto/rand"
"crypto/sha1"
"encoding"
"encoding/hex"
"fmt"
"path/filepath"
)
type ID [sha1.Size]byte
var (
_ = encoding.TextMarshaler(ID{})
_ = encoding.TextUnmarshaler(&ID{})
)
func (id ID) String() string {
return hex.EncodeToString(id[:])
}
func (id ID) Path() string {
return filepath.Join(hex.EncodeToString(id[:1]), hex.EncodeToString(id[:]))
}
func (id ID) MarshalText() ([]byte, error) {
return []byte(hex.EncodeToString(id[:])), nil
}
func (id *ID) UnmarshalText(b []byte) error {
raw, err := hex.DecodeString(string(b))
if err != nil {
return err
}
if len(raw) != len(id) {
return fmt.Errorf("invalid id size: %q", b)
}
copy(id[:], raw)
return nil
}
func NewID() ID {
var id ID
_, err := rand.Read(id[:])
if err != nil {
panic(fmt.Sprintf("crypto/rand is unavailable: %v", err))
}
return id
}