110 lines
2.0 KiB
Go
110 lines
2.0 KiB
Go
package main
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import (
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"code.google.com/p/goconf/conf"
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"errors"
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"io"
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"io/ioutil"
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"os"
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"path"
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)
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type LocalStorage struct {
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storageDir string
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tmpSubdir string
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}
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func ensureDirExists(dir string) error {
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_, err := os.Lstat(dir)
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if err != nil {
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fi, err := os.Lstat(path.Dir(dir))
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if err != nil {
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return err
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}
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err = os.Mkdir(dir, fi.Mode().Perm())
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if err != nil {
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return err
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}
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}
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return nil
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}
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func NewLocalStorage(config *conf.ConfigFile) (*LocalStorage, error) {
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storageDir, err := config.GetString("storage", "dir")
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if err != nil {
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return nil, errors.New("Error: LocalStorage indicated in config file, but lacking local storage directory ('dir = some/dir').")
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}
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ls := new(LocalStorage)
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ls.storageDir = storageDir
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ls.tmpSubdir = path.Join(storageDir, ".asink-tmpdir")
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//make sure the base directory and tmp subdir exist
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err = ensureDirExists(ls.storageDir)
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if err != nil {
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return nil, err
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}
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err = ensureDirExists(ls.tmpSubdir)
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if err != nil {
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return nil, err
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}
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return ls, nil
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}
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func (ls *LocalStorage) copyToTmp(src string) (string, error) {
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infile, err := os.Open(src)
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if err != nil {
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return "", err
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}
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defer infile.Close()
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outfile, err := ioutil.TempFile(ls.tmpSubdir, "asink")
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if err != nil {
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return "", err
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}
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defer outfile.Close()
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_, err = io.Copy(outfile, infile)
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if err != nil {
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return "", err
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}
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return outfile.Name(), nil
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}
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func (ls *LocalStorage) Put(filename string, hash string) (e error) {
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tmpfile, err := ls.copyToTmp(filename)
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if err != nil {
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return err
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}
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err = os.Rename(tmpfile, path.Join(ls.storageDir, hash))
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if err != nil {
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err := os.Remove(tmpfile)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (ls *LocalStorage) Get(filename string, hash string) error {
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infile, err := os.Open(path.Join(ls.storageDir, hash))
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if err != nil {
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return err
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}
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defer infile.Close()
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outfile, err := os.Open(filename)
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if err != nil {
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return err
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}
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defer outfile.Close()
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_, err = io.Copy(outfile, infile)
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return err
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}
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