86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
/*
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Copyright (C) 2013 Aaron Lindsay <aaron@aclindsay.com>
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*/
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package main
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import (
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"asink/util"
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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 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 = util.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 = util.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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type putWriteCloser struct {
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outfile *os.File
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filename string
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}
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func (wc putWriteCloser) Write(p []byte) (n int, err error) {
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return wc.outfile.Write(p)
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}
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func (wc putWriteCloser) Close() error {
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tmpfilename := wc.outfile.Name()
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wc.outfile.Close()
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err := os.Rename(tmpfilename, wc.filename)
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if err != nil {
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err := os.Remove(tmpfilename)
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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) Put(hash string) (w io.WriteCloser, e error) {
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outfile, err := ioutil.TempFile(ls.tmpSubdir, "asink")
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if err != nil {
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return nil, err
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}
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w = putWriteCloser{outfile, path.Join(ls.storageDir, hash)}
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return
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}
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func (ls *LocalStorage) Get(hash string) (r io.ReadCloser, e error) {
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r, err := os.Open(path.Join(ls.storageDir, hash))
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if err != nil {
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return nil, err
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}
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return
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}
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