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