Esempi in Golang per NewDagReader

Esempio n. 1

File: trickle_test.go Progetto: avbalu/go-ipfs

func testFileConsistency(t *testing.T, bs chunk.BlockSplitter, nbytes int) {
	should := make([]byte, nbytes)
	u.NewTimeSeededRand().Read(should)

	read := bytes.NewReader(should)
	ds := mdtest.Mock(t)
	nd, err := buildTestDag(read, ds, bs)
	if err != nil {
		t.Fatal(err)
	}

	r, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(r)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(out, should)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 2

File: trickle_test.go Progetto: avbalu/go-ipfs

func TestSeekEndSingleBlockFile(t *testing.T) {
	nbytes := int64(100)
	should := make([]byte, nbytes)
	u.NewTimeSeededRand().Read(should)

	read := bytes.NewReader(should)
	ds := mdtest.Mock(t)
	nd, err := buildTestDag(read, ds, &chunk.SizeSplitter{5000})
	if err != nil {
		t.Fatal(err)
	}

	rs, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	seeked, err := rs.Seek(0, os.SEEK_END)
	if err != nil {
		t.Fatal(err)
	}
	if seeked != nbytes {
		t.Fatal("Failed to seek to end")
	}
}

Esempio n. 3

File: importer_test.go Progetto: bussiere/go-ipfs

func TestBalancedDag(t *testing.T) {
	ds := mdtest.Mock()
	buf := make([]byte, 10000)
	u.NewTimeSeededRand().Read(buf)
	r := bytes.NewReader(buf)

	nd, err := BuildDagFromReader(ds, chunk.DefaultSplitter(r), nil)
	if err != nil {
		t.Fatal(err)
	}

	dr, err := uio.NewDagReader(context.TODO(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(dr)
	if err != nil {
		t.Fatal(err)
	}

	if !bytes.Equal(out, buf) {
		t.Fatal("bad read")
	}
}

Esempio n. 4

File: trickle_test.go Progetto: avbalu/go-ipfs

func TestBuilderConsistency(t *testing.T) {
	nbytes := 100000
	buf := new(bytes.Buffer)
	io.CopyN(buf, u.NewTimeSeededRand(), int64(nbytes))
	should := dup(buf.Bytes())
	dagserv := mdtest.Mock(t)
	nd, err := buildTestDag(buf, dagserv, chunk.DefaultSplitter)
	if err != nil {
		t.Fatal(err)
	}
	r, err := uio.NewDagReader(context.Background(), nd, dagserv)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(r)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(out, should)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 5

File: balanced_test.go Progetto: andradeandrey/go-ipfs

func TestSeekingBasic(t *testing.T) {
	nbytes := int64(10 * 1024)
	ds := mdtest.Mock()
	nd, should := getTestDag(t, ds, nbytes, 500)

	rs, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	start := int64(4000)
	n, err := rs.Seek(start, os.SEEK_SET)
	if err != nil {
		t.Fatal(err)
	}
	if n != start {
		t.Fatal("Failed to seek to correct offset")
	}

	out, err := ioutil.ReadAll(rs)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(out, should[start:])
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 6

File: balanced_test.go Progetto: andradeandrey/go-ipfs

func TestSeekToBegin(t *testing.T) {
	ds := mdtest.Mock()
	nd, should := getTestDag(t, ds, 10*1024, 500)

	rs, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	n, err := io.CopyN(ioutil.Discard, rs, 1024*4)
	if err != nil {
		t.Fatal(err)
	}
	if n != 4096 {
		t.Fatal("Copy didnt copy enough bytes")
	}

	seeked, err := rs.Seek(0, os.SEEK_SET)
	if err != nil {
		t.Fatal(err)
	}
	if seeked != 0 {
		t.Fatal("Failed to seek to beginning")
	}

	out, err := ioutil.ReadAll(rs)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(out, should)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 7

File: get.go Progetto: shuanzi/go-ipfs

// getZip is equivalent to `ipfs getdag $hash | gzip`
func getZip(ctx context.Context, node *core.IpfsNode, p path.Path, compression int) (io.Reader, error) {
	dagnode, err := core.Resolve(ctx, node, p)
	if err != nil {
		return nil, err
	}

	reader, err := uio.NewDagReader(ctx, dagnode, node.DAG)
	if err != nil {
		return nil, err
	}

	pr, pw := io.Pipe()
	gw, err := gzip.NewWriterLevel(pw, compression)
	if err != nil {
		return nil, err
	}
	bufin := bufio.NewReader(reader)
	go func() {
		_, err := bufin.WriteTo(gw)
		if err != nil {
			log.Error("Fail to compress the stream")
		}
		gw.Close()
		pw.Close()
	}()

	return pr, nil
}

Esempio n. 8

File: balanced_test.go Progetto: musha68k/go-ipfs

func TestSeekToAlmostBegin(t *testing.T) {
	ds := mdtest.Mock()
	nd, should := getTestDag(t, ds, 10*1024, 500)

	rs, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	n, err := io.CopyN(ioutil.Discard, rs, 1024*4)
	if err != nil {
		t.Fatal(err)
	}
	if n != 4096 {
		t.Fatal("Copy didnt copy enough bytes")
	}

	seeked, err := rs.Seek(1, os.SEEK_SET)
	if err != nil {
		t.Fatal(err)
	}
	if seeked != 1 {
		t.Fatal("Failed to seek to almost beginning")
	}

	dagrArrComp(t, rs, should[1:])
}

Esempio n. 9

File: balanced_test.go Progetto: musha68k/go-ipfs

func TestSeekingConsistency(t *testing.T) {
	nbytes := int64(128 * 1024)
	ds := mdtest.Mock()
	nd, should := getTestDag(t, ds, nbytes, 500)

	rs, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	out := make([]byte, nbytes)

	for coff := nbytes - 4096; coff >= 0; coff -= 4096 {
		t.Log(coff)
		n, err := rs.Seek(coff, os.SEEK_SET)
		if err != nil {
			t.Fatal(err)
		}
		if n != coff {
			t.Fatal("wasnt able to seek to the right position")
		}
		nread, err := rs.Read(out[coff : coff+4096])
		if err != nil {
			t.Fatal(err)
		}
		if nread != 4096 {
			t.Fatal("didnt read the correct number of bytes")
		}
	}

	err = arrComp(out, should)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 10

File: cat.go Progetto: ccsblueboy/go-ipfs

func Cat(ctx context.Context, n *core.IpfsNode, pstr string) (*uio.DagReader, error) {
	dagNode, err := core.Resolve(ctx, n, path.Path(pstr))
	if err != nil {
		return nil, err
	}
	return uio.NewDagReader(ctx, dagNode, n.DAG)
}

Esempio n. 11

File: dagmodifier.go Progetto: musha68k/go-ipfs

func (dm *DagModifier) readPrep() error {
	err := dm.Sync()
	if err != nil {
		return err
	}

	if dm.read == nil {
		ctx, cancel := context.WithCancel(dm.ctx)
		dr, err := uio.NewDagReader(ctx, dm.curNode, dm.dagserv)
		if err != nil {
			return err
		}

		i, err := dr.Seek(int64(dm.curWrOff), os.SEEK_SET)
		if err != nil {
			return err
		}

		if i != int64(dm.curWrOff) {
			return ErrSeekFail
		}

		dm.readCancel = cancel
		dm.read = dr
	}

	return nil
}

Esempio n. 12

File: readonly_unix.go Progetto: yanghongkjxy/go-ipfs

func (s *Node) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {

	k, err := s.Nd.Key()
	if err != nil {
		return err
	}

	// setup our logging event
	lm := make(lgbl.DeferredMap)
	lm["fs"] = "ipfs"
	lm["key"] = func() interface{} { return k.B58String() }
	lm["req_offset"] = req.Offset
	lm["req_size"] = req.Size
	defer log.EventBegin(ctx, "fuseRead", lm).Done()

	r, err := uio.NewDagReader(ctx, s.Nd, s.Ipfs.DAG)
	if err != nil {
		return err
	}
	o, err := r.Seek(req.Offset, os.SEEK_SET)
	lm["res_offset"] = o
	if err != nil {
		return err
	}

	buf := resp.Data[:min(req.Size, int(int64(r.Size())-req.Offset))]
	n, err := io.ReadFull(r, buf)
	if err != nil && err != io.EOF {
		return err
	}
	resp.Data = resp.Data[:n]
	lm["res_size"] = n
	return nil // may be non-nil / not succeeded
}

Esempio n. 13

File: trickle_test.go Progetto: avbalu/go-ipfs

func TestIndirectBlocks(t *testing.T) {
	splitter := &chunk.SizeSplitter{512}
	nbytes := 1024 * 1024
	buf := make([]byte, nbytes)
	u.NewTimeSeededRand().Read(buf)

	read := bytes.NewReader(buf)

	ds := mdtest.Mock(t)
	dag, err := buildTestDag(read, ds, splitter)
	if err != nil {
		t.Fatal(err)
	}

	reader, err := uio.NewDagReader(context.Background(), dag, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(reader)
	if err != nil {
		t.Fatal(err)
	}

	if !bytes.Equal(out, buf) {
		t.Fatal("Not equal!")
	}
}

Esempio n. 14

File: cat.go Progetto: rdterner/go-ipfs

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

Esempio n. 15

File: cat.go Progetto: heems/go-ipfs

func Cat(n *core.IpfsNode, pstr string) (io.Reader, 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)
}

Esempio n. 16

File: mfs_test.go Progetto: ccsblueboy/go-ipfs

func catNode(ds dag.DAGService, nd *dag.Node) ([]byte, error) {
	r, err := uio.NewDagReader(context.TODO(), nd, ds)
	if err != nil {
		return nil, err
	}
	defer r.Close()

	return ioutil.ReadAll(r)
}

Esempio n. 17

File: metadata_test.go Progetto: yuanwr/go-ipfs

func TestMetadata(t *testing.T) {
	ctx := context.Background()
	// Make some random node
	ds := getDagserv(t)
	data := make([]byte, 1000)
	u.NewTimeSeededRand().Read(data)
	r := bytes.NewReader(data)
	nd, err := importer.BuildDagFromReader(ds, chunk.DefaultSplitter(r))
	if err != nil {
		t.Fatal(err)
	}

	k, err := nd.Key()
	if err != nil {
		t.Fatal(err)
	}

	m := new(ft.Metadata)
	m.MimeType = "THIS IS A TEST"

	// Such effort, many compromise
	ipfsnode := &core.IpfsNode{DAG: ds}

	mdk, err := AddMetadataTo(ipfsnode, k.B58String(), m)
	if err != nil {
		t.Fatal(err)
	}

	rec, err := Metadata(ipfsnode, mdk)
	if err != nil {
		t.Fatal(err)
	}
	if rec.MimeType != m.MimeType {
		t.Fatalf("something went wrong in conversion: '%s' != '%s'", rec.MimeType, m.MimeType)
	}

	retnode, err := ds.Get(ctx, key.B58KeyDecode(mdk))
	if err != nil {
		t.Fatal(err)
	}

	ndr, err := uio.NewDagReader(ctx, retnode, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(ndr)
	if err != nil {
		t.Fatal(err)
	}

	if !bytes.Equal(out, data) {
		t.Fatal("read incorrect data")
	}
}

Esempio n. 18

File: balanced_test.go Progetto: qnib/go-ipfs

func TestTwoChunks(t *testing.T) {
	ds := mdtest.Mock()

	nd, should := getTestDag(t, ds, 2000, 1000)
	r, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	dagrArrComp(t, r, should)
}

Esempio n. 19

File: balanced_test.go Progetto: musha68k/go-ipfs

func testFileConsistency(t *testing.T, nbytes int64, blksize int64) {
	ds := mdtest.Mock()
	nd, should := getTestDag(t, ds, nbytes, blksize)

	r, err := uio.NewDagReader(context.Background(), nd, ds)
	if err != nil {
		t.Fatal(err)
	}

	dagrArrComp(t, r, should)
}

Esempio n. 20

File: dagmodifier_test.go Progetto: yiwang/go-ipfs

func TestMultiWrite(t *testing.T) {
	dserv := getMockDagServ(t)
	_, n := getNode(t, dserv, 0)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	dagmod, err := NewDagModifier(ctx, n, dserv, sizeSplitterGen(512))
	if err != nil {
		t.Fatal(err)
	}

	data := make([]byte, 4000)
	u.NewTimeSeededRand().Read(data)

	for i := 0; i < len(data); i++ {
		n, err := dagmod.WriteAt(data[i:i+1], int64(i))
		if err != nil {
			t.Fatal(err)
		}
		if n != 1 {
			t.Fatal("Somehow wrote the wrong number of bytes! (n != 1)")
		}

		size, err := dagmod.Size()
		if err != nil {
			t.Fatal(err)
		}

		if size != int64(i+1) {
			t.Fatal("Size was reported incorrectly")
		}
	}
	nd, err := dagmod.GetNode()
	if err != nil {
		t.Fatal(err)
	}

	read, err := uio.NewDagReader(context.Background(), nd, dserv)
	if err != nil {
		t.Fatal(err)
	}
	rbuf, err := ioutil.ReadAll(read)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(rbuf, data)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 21

File: trickle_test.go Progetto: andradeandrey/go-ipfs

// This test appends one byte at a time to an empty file
func TestMultipleAppends(t *testing.T) {
	ds := mdtest.Mock()

	// TODO: fix small size appends and make this number bigger
	nbytes := int64(1000)
	should := make([]byte, nbytes)
	u.NewTimeSeededRand().Read(should)

	read := bytes.NewReader(nil)
	nd, err := buildTestDag(ds, chunk.NewSizeSplitter(read, 500))
	if err != nil {
		t.Fatal(err)
	}

	dbp := &h.DagBuilderParams{
		Dagserv:  ds,
		Maxlinks: 4,
	}

	spl := chunk.SizeSplitterGen(500)

	ctx := context.Background()
	for i := 0; i < len(should); i++ {
		blks, errs := chunk.Chan(spl(bytes.NewReader(should[i : i+1])))

		nnode, err := TrickleAppend(ctx, nd, dbp.New(blks, errs))
		if err != nil {
			t.Fatal(err)
		}

		err = VerifyTrickleDagStructure(nnode, ds, dbp.Maxlinks, layerRepeat)
		if err != nil {
			t.Fatal(err)
		}

		fread, err := uio.NewDagReader(ctx, nnode, ds)
		if err != nil {
			t.Fatal(err)
		}

		out, err := ioutil.ReadAll(fread)
		if err != nil {
			t.Fatal(err)
		}

		err = arrComp(out, should[:i+1])
		if err != nil {
			t.Fatal(err)
		}
	}
}

Esempio n. 22

File: unixfs.go Progetto: VictorBjelkholm/go-ipfs

func (api *UnixfsAPI) Cat(ctx context.Context, p string) (coreiface.Reader, error) {
	dagnode, err := resolve(ctx, api.node, p)
	if err != nil {
		return nil, err
	}

	r, err := uio.NewDagReader(ctx, dagnode, api.node.DAG)
	if err == uio.ErrIsDir {
		return nil, coreiface.ErrIsDir
	} else if err != nil {
		return nil, err
	}
	return r, nil
}

Esempio n. 23

File: main.go Progetto: cryptix/ipget

func cat(ctx context.Context, node *core.IpfsNode, fpath string) (io.Reader, uint64, error) {
	dagnode, err := core.Resolve(ctx, node, path.Path(fpath))
	if err != nil {
		return nil, 0, err
	}

	reader, err := uio.NewDagReader(ctx, dagnode, node.DAG)
	if err != nil {
		return nil, 0, err
	}
	length := uint64(reader.Size())

	return reader, length, nil
}

Esempio n. 24

File: cat.go Progetto: noffle/ipfs-embedded-shell

// Cat resolves the ipfs path p and returns a reader for that data, if it exists and is availalbe
func (s *Shell) Cat(p string) (io.ReadCloser, error) {
	ipfsPath, err := path.ParsePath(p)
	if err != nil {
		return nil, errgo.Notef(err, "cat: could not parse %q", p)
	}
	nd, err := core.Resolve(s.ctx, s.node, ipfsPath)
	if err != nil {
		return nil, errgo.Notef(err, "cat: could not resolve %s", ipfsPath)
	}
	dr, err := unixfsio.NewDagReader(s.ctx, nd, s.node.DAG)
	if err != nil {
		return nil, errgo.Notef(err, "cat: failed to construct DAG reader")
	}
	return dr, nil
}

Esempio n. 25

File: importer_test.go Progetto: bussiere/go-ipfs

func runReadBench(b *testing.B, nd *dag.Node, ds dag.DAGService) {
	for i := 0; i < b.N; i++ {
		ctx, cancel := context.WithCancel(context.TODO())
		read, err := uio.NewDagReader(ctx, nd, ds)
		if err != nil {
			b.Fatal(err)
		}

		_, err = read.WriteTo(ioutil.Discard)
		if err != nil && err != io.EOF {
			b.Fatal(err)
		}
		cancel()
	}
}

Esempio n. 26

File: dagmodifier_test.go Progetto: VictorBjelkholm/go-ipfs

func TestMultiWriteAndFlush(t *testing.T) {
	dserv := testu.GetDAGServ()
	n := testu.GetEmptyNode(t, dserv)

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	dagmod, err := NewDagModifier(ctx, n, dserv, testu.SizeSplitterGen(512))
	if err != nil {
		t.Fatal(err)
	}

	data := make([]byte, 20)
	u.NewTimeSeededRand().Read(data)

	for i := 0; i < len(data); i++ {
		n, err := dagmod.WriteAt(data[i:i+1], int64(i))
		if err != nil {
			t.Fatal(err)
		}
		if n != 1 {
			t.Fatal("Somehow wrote the wrong number of bytes! (n != 1)")
		}
		err = dagmod.Sync()
		if err != nil {
			t.Fatal(err)
		}
	}
	nd, err := dagmod.GetNode()
	if err != nil {
		t.Fatal(err)
	}

	read, err := uio.NewDagReader(context.Background(), nd, dserv)
	if err != nil {
		t.Fatal(err)
	}
	rbuf, err := ioutil.ReadAll(read)
	if err != nil {
		t.Fatal(err)
	}

	err = testu.ArrComp(rbuf, data)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 27

File: trickle_test.go Progetto: andradeandrey/go-ipfs

func TestAppend(t *testing.T) {
	nbytes := int64(128 * 1024)
	should := make([]byte, nbytes)
	u.NewTimeSeededRand().Read(should)

	// Reader for half the bytes
	read := bytes.NewReader(should[:nbytes/2])
	ds := mdtest.Mock()
	nd, err := buildTestDag(ds, chunk.NewSizeSplitter(read, 500))
	if err != nil {
		t.Fatal(err)
	}

	dbp := &h.DagBuilderParams{
		Dagserv:  ds,
		Maxlinks: h.DefaultLinksPerBlock,
	}

	r := bytes.NewReader(should[nbytes/2:])
	blks, errs := chunk.Chan(chunk.NewSizeSplitter(r, 500))

	ctx := context.Background()
	nnode, err := TrickleAppend(ctx, nd, dbp.New(blks, errs))
	if err != nil {
		t.Fatal(err)
	}

	err = VerifyTrickleDagStructure(nnode, ds, dbp.Maxlinks, layerRepeat)
	if err != nil {
		t.Fatal(err)
	}

	fread, err := uio.NewDagReader(ctx, nnode, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(fread)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(out, should)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 28

File: writer.go Progetto: hebelken/go-ipfs

func (w *Writer) writeFile(ctx cxt.Context, nd *mdag.Node, pb *upb.Data, fpath string) error {
	if err := writeFileHeader(w.TarW, fpath, pb.GetFilesize()); err != nil {
		return err
	}

	dagr, err := uio.NewDagReader(ctx, nd, w.Dag)
	if err != nil {
		return err
	}

	_, err = io.Copy(w.TarW, dagr)
	if err != nil && err != io.EOF {
		return err
	}

	return nil
}

Esempio n. 29

File: trickle_test.go Progetto: avbalu/go-ipfs

func TestAppend(t *testing.T) {
	nbytes := int64(128 * 1024)
	should := make([]byte, nbytes)
	u.NewTimeSeededRand().Read(should)

	// Reader for half the bytes
	read := bytes.NewReader(should[:nbytes/2])
	ds := mdtest.Mock(t)
	nd, err := buildTestDag(read, ds, &chunk.SizeSplitter{500})
	if err != nil {
		t.Fatal(err)
	}

	dbp := &h.DagBuilderParams{
		Dagserv:  ds,
		Maxlinks: h.DefaultLinksPerBlock,
	}

	spl := &chunk.SizeSplitter{500}
	blks := spl.Split(bytes.NewReader(should[nbytes/2:]))

	nnode, err := TrickleAppend(nd, dbp.New(blks))
	if err != nil {
		t.Fatal(err)
	}

	err = VerifyTrickleDagStructure(nnode, ds, dbp.Maxlinks, layerRepeat)
	if err != nil {
		t.Fatal(err)
	}

	fread, err := uio.NewDagReader(context.TODO(), nnode, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(fread)
	if err != nil {
		t.Fatal(err)
	}

	err = arrComp(out, should)
	if err != nil {
		t.Fatal(err)
	}
}

Esempio n. 30

File: trickle_test.go Progetto: andradeandrey/go-ipfs

func TestAppendSingleBytesToEmpty(t *testing.T) {
	ds := mdtest.Mock()

	data := []byte("AB")

	nd := new(merkledag.Node)
	nd.Data = ft.FilePBData(nil, 0)

	dbp := &h.DagBuilderParams{
		Dagserv:  ds,
		Maxlinks: 4,
	}

	spl := chunk.SizeSplitterGen(500)

	blks, errs := chunk.Chan(spl(bytes.NewReader(data[:1])))

	ctx := context.Background()
	nnode, err := TrickleAppend(ctx, nd, dbp.New(blks, errs))
	if err != nil {
		t.Fatal(err)
	}

	blks, errs = chunk.Chan(spl(bytes.NewReader(data[1:])))

	nnode, err = TrickleAppend(ctx, nnode, dbp.New(blks, errs))
	if err != nil {
		t.Fatal(err)
	}

	fread, err := uio.NewDagReader(ctx, nnode, ds)
	if err != nil {
		t.Fatal(err)
	}

	out, err := ioutil.ReadAll(fread)
	if err != nil {
		t.Fatal(err)
	}

	fmt.Println(out, data)
	err = arrComp(out, data)
	if err != nil {
		t.Fatal(err)
	}
}