Golang IpfsNode.Context方法代码示例

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
}

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

	return nil
}

func Cat(n *core.IpfsNode, pstr string) (*uio.DagReader, error) {
	p := path.FromString(pstr)
	dagNode, err := n.Resolver.ResolvePath(n.Context(), p)
	if err != nil {
		return nil, err
	}
	return uio.NewDagReader(n.Context(), dagNode, n.DAG)
}

func Dial(nd *core.IpfsNode, p peer.ID, protocol string) (net.Stream, error) {
	ctx, cancel := context.WithTimeout(nd.Context(), time.Second*30)
	defer cancel()
	err := nd.PeerHost.Connect(ctx, peer.PeerInfo{ID: p})
	if err != nil {
		return nil, err
	}
	return nd.PeerHost.NewStream(pro.ID(protocol), p)
}

func addNode(n *core.IpfsNode, node *merkledag.Node) error {
	if err := n.DAG.AddRecursive(node); err != nil { // add the file to the graph + local storage
		return err
	}
	ctx, cancel := context.WithCancel(n.Context())
	defer cancel()
	err := n.Pinning.Pin(ctx, node, true) // ensure we keep it
	return err
}

func Metadata(n *core.IpfsNode, skey string) (*ft.Metadata, error) {
	ukey := key.B58KeyDecode(skey)

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

	return ft.MetadataFromBytes(nd.Data)
}

func getPaths(t *testing.T, ipfs *core.IpfsNode, name string, n *dag.Node) []string {
	if len(n.Links) == 0 {
		return []string{name}
	}
	var out []string
	for _, lnk := range n.Links {
		child, err := lnk.GetNode(ipfs.Context(), ipfs.DAG)
		if err != nil {
			t.Fatal(err)
		}
		sub := getPaths(t, ipfs, path.Join(name, lnk.Name), child)
		out = append(out, sub...)
	}
	return out
}

func Listen(nd *core.IpfsNode, protocol string) (*ipfsListener, error) {
	ctx, cancel := context.WithCancel(nd.Context())

	list := &ipfsListener{
		proto:  pro.ID(protocol),
		conCh:  make(chan net.Stream),
		ctx:    ctx,
		cancel: cancel,
	}

	nd.PeerHost.SetStreamHandler(list.proto, func(s net.Stream) {
		select {
		case list.conCh <- s:
		case <-ctx.Done():
			s.Close()
		}
	})

	return list, nil
}

// Mount mounts ipns at a given location, and returns a mount.Mount instance.
func Mount(ipfs *core.IpfsNode, ipnsmp, ipfsmp string) (mount.Mount, error) {
	cfg, err := ipfs.Repo.Config()
	if err != nil {
		return nil, err
	}

	allow_other := cfg.Mounts.FuseAllowOther

	if ipfs.IpnsFs == nil {
		fs, err := ipnsfs.NewFilesystem(ipfs.Context(), ipfs.DAG, ipfs.Namesys, ipfs.Pinning, ipfs.PrivateKey)
		if err != nil {
			return nil, err
		}
		ipfs.IpnsFs = fs
	}

	fsys, err := NewFileSystem(ipfs, ipfs.PrivateKey, ipfsmp, ipnsmp)
	if err != nil {
		return nil, err
	}

	return mount.NewMount(ipfs.Process(), fsys, ipnsmp, allow_other)
}

func addAssetList(nd *core.IpfsNode, l []string) (*key.Key, error) {
	dirb := uio.NewDirectory(nd.DAG)

	for _, p := range l {
		d, err := Asset(p)
		if err != nil {
			return nil, fmt.Errorf("assets: could load Asset '%s': %s", p, err)
		}

		s, err := coreunix.Add(nd, bytes.NewBuffer(d))
		if err != nil {
			return nil, fmt.Errorf("assets: could not Add '%s': %s", p, err)
		}

		fname := filepath.Base(p)
		k := key.B58KeyDecode(s)
		if err := dirb.AddChild(nd.Context(), fname, k); err != nil {
			return nil, fmt.Errorf("assets: could not add '%s' as a child: %s", fname, err)
		}
	}

	dir := dirb.GetNode()
	dkey, err := nd.DAG.Add(dir)
	if err != nil {
		return nil, fmt.Errorf("assets: DAG.Add(dir) failed: %s", err)
	}

	if err := nd.Pinning.Pin(nd.Context(), dir, true); err != nil {
		return nil, fmt.Errorf("assets: Pinning on init-docu failed: %s", err)
	}

	if err := nd.Pinning.Flush(); err != nil {
		return nil, fmt.Errorf("assets: Pinning flush failed: %s", err)
	}

	return &dkey, nil
}