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package getter
import (
"crypto/md5"
"encoding/hex"
"fmt"
"os"
"path/filepath"
)
// FolderStorage is an implementation of the Storage interface that manages
// modules on the disk.
type FolderStorage struct {
// StorageDir is the directory where the modules will be stored.
StorageDir string
}
// Dir implements Storage.Dir
func (s *FolderStorage) Dir(key string) (d string, e bool, err error) {
d = s.dir(key)
_, err = os.Stat(d)
if err == nil {
// Directory exists
e = true
return
}
if os.IsNotExist(err) {
// Directory doesn't exist
d = ""
e = false
err = nil
return
}
// An error
d = ""
e = false
return
}
// Get implements Storage.Get
func (s *FolderStorage) Get(key string, source string, update bool) error {
dir := s.dir(key)
if !update {
if _, err := os.Stat(dir); err == nil {
// If the directory already exists, then we're done since
// we're not updating.
return nil
} else if !os.IsNotExist(err) {
// If the error we got wasn't a file-not-exist error, then
// something went wrong and we should report it.
return fmt.Errorf("Error reading module directory: %s", err)
}
}
// Get the source. This always forces an update.
return Get(dir, source)
}
// dir returns the directory name internally that we'll use to map to
// internally.
func (s *FolderStorage) dir(key string) string {
sum := md5.Sum([]byte(key))
return filepath.Join(s.StorageDir, hex.EncodeToString(sum[:]))
}
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