Initial Commit

storage_local.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"os"
+	"io"
+	"io/ioutil"
+	"path"
+	"errors"
+	"code.google.com/p/goconf/conf"
+)
+
+type LocalStorage struct {
+	storageDir string
+	tmpSubdir string
+}
+
+func NewLocalStorage(config *conf.ConfigFile) (*LocalStorage, error) {
+	storageDir, err := config.GetString("storage", "dir")
+	if err != nil {
+		return nil, errors.New("Error: LocalStorage indicated in config file, but lacking local storage directory ('dir = some/dir').")
+	}
+
+	ls := new(LocalStorage)
+	ls.storageDir = storageDir
+	ls.tmpSubdir = path.Join(storageDir, ".asink-tmpdir")
+	return ls, nil
+}
+
+func (ls *LocalStorage) copyToTmp(src string) (string, error) {
+	infile, err := os.Open(src)
+	if err != nil { return "", err }
+	defer infile.Close()
+	
+	outfile, err := ioutil.TempFile(ls.tmpSubdir, "asink")
+	if err != nil { return "", err }
+	defer outfile.Close()
+
+	_, err = io.Copy(outfile, infile)
+	if err != nil { return "", err }
+
+	return outfile.Name(), nil
+}
+
+func (ls *LocalStorage) Put(filename string, hash string) (e error) {
+	tmpfile, err := ls.copyToTmp(filename)
+	if err != nil { return err }
+	defer func() {
+		err := os.Remove(tmpfile)
+		if err != nil && e == nil { e = err }
+	}()
+
+	err = os.Rename(tmpfile, path.Join(ls.storageDir, hash))
+
+	return nil
+}
+
+func (ls *LocalStorage) Get(filename string, hash string) error {
+	infile, err := os.Open(path.Join(ls.storageDir, hash))
+	if err != nil { return err }
+	defer infile.Close()
+
+	outfile, err := os.Open(filename)
+	if err != nil { return err }
+	defer outfile.Close()
+
+	_, err = io.Copy(outfile, infile)
+
+	return err
+}