Golang unixfs.FolderPBData函数代码示例

// InitializeKeyspace sets the ipns record for the given key to
// point to an empty directory.
func InitializeKeyspace(n *core.IpfsNode, key ci.PrivKey) error {
	emptyDir := &mdag.Node{Data: ft.FolderPBData()}
	nodek, err := n.DAG.Add(emptyDir)
	if err != nil {
		return err
	}

	ctx, cancel := context.WithCancel(n.Context())
	defer cancel()

	err = n.Pinning.Pin(ctx, emptyDir, false)
	if err != nil {
		return err
	}

	err = n.Pinning.Flush()
	if err != nil {
		return err
	}

	pub := nsys.NewRoutingPublisher(n.Routing, n.Repo.Datastore())
	if err := pub.Publish(ctx, key, path.FromKey(nodek)); err != nil {
		return err
	}

	return nil
}

func (d *Directory) Mkdir(name string) (*Directory, error) {
	d.lock.Lock()
	defer d.lock.Unlock()

	fsn, err := d.childUnsync(name)
	if err == nil {
		switch fsn := fsn.(type) {
		case *Directory:
			return fsn, os.ErrExist
		case *File:
			return nil, os.ErrExist
		default:
			return nil, fmt.Errorf("unrecognized type: %#v", fsn)
		}
	}

	ndir := &dag.Node{Data: ft.FolderPBData()}

	_, err = d.dserv.Add(ndir)
	if err != nil {
		return nil, err
	}

	err = d.node.AddNodeLinkClean(name, ndir)
	if err != nil {
		return nil, err
	}

	dirobj := NewDirectory(d.ctx, name, ndir, d, d.dserv)
	d.childDirs[name] = dirobj
	return dirobj, nil
}

// InitializeKeyspace sets the ipns record for the given key to
// point to an empty directory.
// TODO: this doesnt feel like it belongs here
func InitializeKeyspace(ctx context.Context, ds dag.DAGService, pub Publisher, pins pin.Pinner, key ci.PrivKey) error {
	emptyDir := &dag.Node{Data: ft.FolderPBData()}
	nodek, err := ds.Add(emptyDir)
	if err != nil {
		return err
	}

	// pin recursively because this might already be pinned
	// and doing a direct pin would throw an error in that case
	err = pins.Pin(ctx, emptyDir, true)
	if err != nil {
		return err
	}

	err = pins.Flush()
	if err != nil {
		return err
	}

	err = pub.Publish(ctx, key, path.FromKey(nodek))
	if err != nil {
		return err
	}

	return nil
}

func (d *Directory) Mkdir(name string) (*Directory, error) {
	d.lock.Lock()
	defer d.lock.Unlock()

	_, err := d.childDir(name)
	if err == nil {
		return nil, os.ErrExist
	}
	_, err = d.childFile(name)
	if err == nil {
		return nil, os.ErrExist
	}

	ndir := &dag.Node{Data: ft.FolderPBData()}
	err = d.node.AddNodeLinkClean(name, ndir)
	if err != nil {
		return nil, err
	}

	err = d.parent.closeChild(d.name, d.node)
	if err != nil {
		return nil, err
	}

	return d.childDir(name)
}

func addDir(n *core.IpfsNode, dir files.File) (*merkledag.Node, error) {

	tree := &merkledag.Node{Data: unixfs.FolderPBData()}

Loop:
	for {
		file, err := dir.NextFile()
		switch {
		case err != nil && err != io.EOF:
			return nil, err
		case err == io.EOF:
			break Loop
		}

		node, err := addFile(n, file)
		if err != nil {
			return nil, err
		}

		_, name := gopath.Split(file.FileName())

		if err := tree.AddNodeLink(name, node); err != nil {
			return nil, err
		}
	}

	if err := addNode(n, tree); err != nil {
		return nil, err
	}
	return tree, nil
}

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)
	}
}

func setupRoot(ctx context.Context, t *testing.T) (dag.DAGService, *Root) {
	ds := getDagserv(t)

	root := &dag.Node{Data: ft.FolderPBData()}
	rt, err := NewRoot(ctx, ds, root, func(ctx context.Context, k key.Key) error {
		fmt.Println("PUBLISHED: ", k)
		return nil
	})

	if err != nil {
		t.Fatal(err)
	}

	return ds, rt
}

func (s *Shell) NewObject(template string) (string, error) {
	node := new(dag.Node)
	switch template {
	case "":
		break
	case "unixfs-dir":
		node.Data = ft.FolderPBData()
	default:
		return "", fmt.Errorf("unknown template %s", template)
	}
	k, err := s.node.DAG.Add(node)
	if err != nil {
		return "", err
	}

	return k.B58String(), nil
}

func (params *adder) addDir(file files.File) (*dag.Node, error) {
	tree := &dag.Node{Data: ft.FolderPBData()}
	log.Infof("adding directory: %s", file.FileName())

	for {
		file, err := file.NextFile()
		if err != nil && err != io.EOF {
			return nil, err
		}
		if file == nil {
			break
		}

		node, err := params.addFile(file)
		if _, ok := err.(*hiddenFileError); ok {
			// hidden file error, set the node to nil for below
			node = nil
		} else if err != nil {
			return nil, err
		}

		if node != nil {
			_, name := path.Split(file.FileName())

			err = tree.AddNodeLink(name, node)
			if err != nil {
				return nil, err
			}
		}
	}

	err := outputDagnode(params.out, file.FileName(), tree)
	if err != nil {
		return nil, err
	}

	k, err := params.node.DAG.Add(tree)
	if err != nil {
		return nil, err
	}

	params.node.Pinning.GetManual().PinWithMode(k, pin.Indirect)

	return tree, nil
}

func addLinkCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 4 {
		return "", fmt.Errorf("not enough arguments for add-link")
	}

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

	path := req.Arguments()[2]
	childk := key.B58KeyDecode(req.Arguments()[3])

	create, _, err := req.Option("create").Bool()
	if err != nil {
		return "", err
	}

	var createfunc func() *dag.Node
	if create {
		createfunc = func() *dag.Node {
			return &dag.Node{Data: ft.FolderPBData()}
		}
	}

	e := dagutils.NewDagEditor(nd.DAG, root)

	childnd, err := nd.DAG.Get(req.Context(), childk)
	if err != nil {
		return "", err
	}

	err = e.InsertNodeAtPath(req.Context(), path, childnd, createfunc)
	if err != nil {
		return "", err
	}

	nnode := e.GetNode()

	return nnode.Key()
}

func addDir(n *core.IpfsNode, dir files.File, out chan interface{}, progress bool, useTrickle bool) (*dag.Node, error) {
	log.Infof("adding directory: %s", dir.FileName())

	tree := &dag.Node{Data: ft.FolderPBData()}

	for {
		file, err := dir.NextFile()
		if err != nil && err != io.EOF {
			return nil, err
		}
		if file == nil {
			break
		}

		node, err := addFile(n, file, out, progress, false, useTrickle)
		if err != nil {
			return nil, err
		}

		_, name := path.Split(file.FileName())

		err = tree.AddNodeLink(name, node)
		if err != nil {
			return nil, err
		}
	}

	err := outputDagnode(out, dir.FileName(), tree)
	if err != nil {
		return nil, err
	}

	k, err := n.DAG.Add(tree)
	if err != nil {
		return nil, err
	}

	n.Pinning.GetManual().PinWithMode(k, pin.Indirect)

	return tree, nil
}

//TODO: hrm, maybe this interface could be better
func (s *Shell) PatchLink(root, npath, childhash string, create bool) (string, error) {
	p, err := path.ParsePath(root)
	if err != nil {
		return "", err
	}

	rootnd, err := core.Resolve(s.ctx, s.node, p)
	if err != nil {
		return "", err
	}

	childpath, err := path.ParsePath(childhash)
	if err != nil {
		return "", err
	}

	nnode, err := core.Resolve(s.ctx, s.node, childpath)
	if err != nil {
		return "", err
	}

	e := dagutils.NewDagEditor(rootnd, s.node.DAG)
	err = e.InsertNodeAtPath(s.ctx, npath, nnode, func() *dag.Node {
		return &dag.Node{Data: ft.FolderPBData()}
	})
	if err != nil {
		return "", err
	}

	_, err = e.Finalize(s.node.DAG)
	if err != nil {
		return "", err
	}

	final, err := e.GetNode().Key()
	if err != nil {
		return "", err
	}

	return final.B58String(), nil
}

// TODO: generalize this to more than unix-fs nodes.
func NewDirNode() *dag.Node {
	return &dag.Node{Data: unixfs.FolderPBData()}
}

func emptyDirNode() *dag.ProtoNode {
	return dag.NodeWithData(ft.FolderPBData())
}

// TODO: generalize this to more than unix-fs nodes.
func newDirNode() *dag.Node {
	return &dag.Node{Data: ft.FolderPBData()}
}