예제 #1
0
파일: util.go 프로젝트: jyzhe/beehive
func Exist(dirpath string) bool {
	names, err := fileutil.ReadDir(dirpath)
	if err != nil {
		return false
	}
	return len(names) != 0
}
예제 #2
0
파일: repair.go 프로젝트: jyzhe/beehive
// openLast opens the last wal file for read and write.
func openLast(dirpath string) (*os.File, error) {
	names, err := fileutil.ReadDir(dirpath)
	if err != nil {
		return nil, err
	}
	names = checkWalNames(names)
	if len(names) == 0 {
		return nil, ErrFileNotFound
	}
	last := path.Join(dirpath, names[len(names)-1])
	return os.OpenFile(last, os.O_RDWR, 0)
}
예제 #3
0
파일: wal.go 프로젝트: jyzhe/beehive
func openAtIndex(dirpath string, snap walpb.Snapshot, write bool) (*WAL, error) {
	names, err := fileutil.ReadDir(dirpath)
	if err != nil {
		return nil, err
	}
	names = checkWalNames(names)
	if len(names) == 0 {
		return nil, ErrFileNotFound
	}

	nameIndex, ok := searchIndex(names, snap.Index)
	if !ok || !isValidSeq(names[nameIndex:]) {
		return nil, ErrFileNotFound
	}

	// open the wal files for reading
	rcs := make([]io.ReadCloser, 0)
	ls := make([]fileutil.Lock, 0)
	for _, name := range names[nameIndex:] {
		f, err := os.Open(path.Join(dirpath, name))
		if err != nil {
			return nil, err
		}
		l, err := fileutil.NewLock(f.Name())
		if err != nil {
			return nil, err
		}
		err = l.TryLock()
		if err != nil {
			if write {
				return nil, err
			}
		}
		rcs = append(rcs, f)
		ls = append(ls, l)
	}
	rc := MultiReadCloser(rcs...)

	// create a WAL ready for reading
	w := &WAL{
		dir:     dirpath,
		start:   snap,
		decoder: newDecoder(rc),
		locks:   ls,
	}

	if write {
		// open the lastest wal file for appending
		seq, _, err := parseWalName(names[len(names)-1])
		if err != nil {
			rc.Close()
			return nil, err
		}
		last := path.Join(dirpath, names[len(names)-1])

		f, err := os.OpenFile(last, os.O_WRONLY|os.O_APPEND, 0)
		if err != nil {
			rc.Close()
			return nil, err
		}
		err = fileutil.Preallocate(f, segmentSizeBytes)
		if err != nil {
			rc.Close()
			plog.Errorf("failed to allocate space when creating new wal file (%v)", err)
			return nil, err
		}

		w.f = f
		w.seq = seq
	}

	return w, nil
}