Beispiel #1
0
func AddMetadataTo(n *core.IpfsNode, skey string, m *ft.Metadata) (string, error) {
	ukey := key.B58KeyDecode(skey)

	nd, err := n.DAG.Get(n.Context(), ukey)
	if err != nil {
		return "", err
	}

	mdnode := new(dag.Node)
	mdata, err := ft.BytesForMetadata(m)
	if err != nil {
		return "", err
	}

	mdnode.Data = mdata
	if err := mdnode.AddNodeLinkClean("file", nd); err != nil {
		return "", err
	}

	nk, err := n.DAG.Add(mdnode)
	if err != nil {
		return "", err
	}

	return nk.B58String(), nil
}
Beispiel #2
0
func nodeFromTemplate(template string) (*dag.Node, error) {
	switch template {
	case "unixfs-dir":
		nd := new(dag.Node)
		nd.Data = ft.FolderPBData()
		return nd, nil
	default:
		return nil, fmt.Errorf("template '%s' not found", template)
	}
}
Beispiel #3
0
// converts the Node object into a real dag.Node
func deserializeNode(node *Node) (*dag.Node, error) {
	dagnode := new(dag.Node)
	dagnode.Data = []byte(node.Data)
	dagnode.Links = make([]*dag.Link, len(node.Links))
	for i, link := range node.Links {
		hash, err := mh.FromB58String(link.Hash)
		if err != nil {
			return nil, err
		}
		dagnode.Links[i] = &dag.Link{
			Name: link.Name,
			Size: link.Size,
			Hash: hash,
		}
	}

	return dagnode, nil
}
Beispiel #4
0
func setDataCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 3 {
		return "", fmt.Errorf("not enough arguments for set-data")
	}

	nd, err := req.InvocContext().GetNode()
	if err != nil {
		return "", err
	}

	root.Data = []byte(req.Arguments()[2])

	newkey, err := nd.DAG.Add(root)
	if err != nil {
		return "", err
	}

	return newkey, nil
}
Beispiel #5
0
// dagTruncate truncates the given node to 'size' and returns the modified Node
func dagTruncate(ctx context.Context, nd *mdag.Node, size uint64, ds mdag.DAGService) (*mdag.Node, error) {
	if len(nd.Links) == 0 {
		// TODO: this can likely be done without marshaling and remarshaling
		pbn, err := ft.FromBytes(nd.Data)
		if err != nil {
			return nil, err
		}

		nd.Data = ft.WrapData(pbn.Data[:size])
		return nd, nil
	}

	var cur uint64
	end := 0
	var modified *mdag.Node
	ndata := new(ft.FSNode)
	for i, lnk := range nd.Links {
		child, err := lnk.GetNode(ctx, ds)
		if err != nil {
			return nil, err
		}

		childsize, err := ft.DataSize(child.Data)
		if err != nil {
			return nil, err
		}

		// found the child we want to cut
		if size < cur+childsize {
			nchild, err := dagTruncate(ctx, child, size-cur, ds)
			if err != nil {
				return nil, err
			}

			ndata.AddBlockSize(size - cur)

			modified = nchild
			end = i
			break
		}
		cur += childsize
		ndata.AddBlockSize(childsize)
	}

	_, err := ds.Add(modified)
	if err != nil {
		return nil, err
	}

	nd.Links = nd.Links[:end]
	err = nd.AddNodeLinkClean("", modified)
	if err != nil {
		return nil, err
	}

	d, err := ndata.GetBytes()
	if err != nil {
		return nil, err
	}

	nd.Data = d

	// invalidate cache and recompute serialized data
	_, err = nd.Encoded(true)
	if err != nil {
		return nil, err
	}

	return nd, nil
}