Example #1
0
// Get retrieves a node from the dagService, fetching the block in the BlockService
func (n *dagService) Get(ctx context.Context, k key.Key) (*Node, error) {
	if k == "" {
		return nil, ErrNotFound
	}
	if n == nil {
		return nil, fmt.Errorf("dagService is nil")
	}
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	b, err := n.Blocks.GetBlock(ctx, k)
	if err != nil {
		if err == bserv.ErrNotFound {
			return nil, ErrNotFound
		}
		return nil, fmt.Errorf("Failed to get block for %s: %v", k.B58String(), err)
	}

	res, err := DecodeProtobuf(b.Data())
	if err != nil {
		if strings.Contains(err.Error(), "Unmarshal failed") {
			return nil, fmt.Errorf("The block referred to by '%s' was not a valid merkledag node", k)
		}
		return nil, fmt.Errorf("Failed to decode Protocol Buffers: %v", err)
	}

	res.cached = k.ToMultihash()

	return res, nil
}
Example #2
0
// Write one edge
func (rw *RefWriter) WriteEdge(from, to key.Key, linkname string) error {
	if rw.Ctx != nil {
		select {
		case <-rw.Ctx.Done(): // just in case.
			return rw.Ctx.Err()
		default:
		}
	}

	var s string
	switch {
	case rw.PrintFmt != "":
		s = rw.PrintFmt
		s = strings.Replace(s, "<src>", from.B58String(), -1)
		s = strings.Replace(s, "<dst>", to.B58String(), -1)
		s = strings.Replace(s, "<linkname>", linkname, -1)
	case rw.PrintEdge:
		s = from.B58String() + " -> " + to.B58String()
	default:
		s += to.B58String()
	}

	rw.out <- &RefWrapper{Ref: s}
	return nil
}
Example #3
0
// Get retrieves a node from the dagService, fetching the block in the BlockService
func (n *dagService) Get(ctx context.Context, k key.Key) (*Node, error) {
	if n == nil {
		return nil, fmt.Errorf("dagService is nil")
	}
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	b, err := n.Blocks.GetBlock(ctx, k)
	if err != nil {
		if err == bserv.ErrNotFound {
			return nil, ErrNotFound
		}
		return nil, fmt.Errorf("Failed to get block for %s: %v", k.B58String(), err)
	}

	res, err := DecodeProtobuf(b.Data)
	if err != nil {
		return nil, fmt.Errorf("Failed to decode Protocol Buffers: %v", err)
	}
	return res, nil
}