コード例 #1
0
ファイル: kvutil.go プロジェクト: stevearm/camlistore
// Open opens the named kv DB file for reading/writing. It
// creates the file if it does not exist yet.
func Open(dbFile string, opts *kv.Options) (*kv.DB, error) {
	createOpen := kv.Open
	verb := "opening"
	if _, err := os.Stat(dbFile); os.IsNotExist(err) {
		createOpen = kv.Create
		verb = "creating"
	}
	if opts == nil {
		opts = &kv.Options{}
	}
	if opts.Locker == nil {
		opts.Locker = func(dbFile string) (io.Closer, error) {
			lkfile := dbFile + ".lock"
			cl, err := lock.Lock(lkfile)
			if err != nil {
				return nil, fmt.Errorf("failed to acquire lock on %s: %v", lkfile, err)
			}
			return cl, nil
		}
	}
	if v, _ := strconv.ParseBool(os.Getenv("CAMLI_KV_VERIFY")); v {
		opts.VerifyDbBeforeOpen = true
		opts.VerifyDbAfterOpen = true
		opts.VerifyDbBeforeClose = true
		opts.VerifyDbAfterClose = true
	}
	db, err := createOpen(dbFile, opts)
	if err != nil {
		return nil, fmt.Errorf("error %s %s: %v", verb, dbFile, err)
	}
	return db, nil
}
コード例 #2
0
ファイル: diskpacked.go プロジェクト: pombredanne/camlistore
// openForWrite will create or open pack file n for writes, create a lock
// visible external to the process and seek to the end of the file ready for
// appending new data.
// This function is not thread safe, s.mu should be locked by the caller.
func (s *storage) openForWrite(n int) error {
	fn := s.filename(n)
	l, err := lock.Lock(fn + ".lock")
	if err != nil {
		return err
	}
	f, err := os.OpenFile(fn, os.O_RDWR|os.O_CREATE, 0666)
	if err != nil {
		l.Close()
		return err
	}
	openFdsVar.Add(s.root, 1)
	debug.Printf("diskpacked: opened for write %q", fn)

	s.size, err = f.Seek(0, os.SEEK_END)
	if err != nil {
		return err
	}

	s.writer = f
	s.writeLock = l
	return nil
}