fix(fsnode): issue #17

hamt/hamt.go

@@ -102,28 +102,29 @@ func NewHamtFromDag(dserv ipld.DAGService, nd ipld.Node) (*Shard, error) {
 		return nil, dag.ErrNotProtobuf
 	}
 
-	pbd, err := format.FromBytes(pbnd.Data())
+	fsn, err := format.FSNodeFromBytes(pbnd.Data())
 	if err != nil {
 		return nil, err
 	}
 
-	if pbd.GetType() != upb.Data_HAMTShard {
+
+	if fsn.Type() != upb.Data_HAMTShard {
 		return nil, fmt.Errorf("node was not a dir shard")
 	}
 
-	if pbd.GetHashType() != HashMurmur3 {
+	if fsn.HashType() != HashMurmur3 {
 		return nil, fmt.Errorf("only murmur3 supported as hash function")
 	}
 
-	ds, err := makeShard(dserv, int(pbd.GetFanout()))
+	ds, err := makeShard(dserv, int(fsn.Fanout()))
 	if err != nil {
 		return nil, err
 	}
 
 	ds.nd = pbnd.Copy().(*dag.ProtoNode)
 	ds.children = make([]child, len(pbnd.Links()))
-	ds.bitfield.SetBytes(pbd.GetData())
-	ds.hashFunc = pbd.GetHashType()
+	ds.bitfield.SetBytes(fsn.Data())
+	ds.hashFunc = fsn.HashType()
 	ds.builder = ds.nd.CidBuilder()
 
 	return ds, nil

importer/trickle/trickledag.go

@@ -277,12 +277,12 @@ func verifyTDagRec(n ipld.Node, depth int, p VerifyParams) error {
 		// zero depth dag is raw data block
 		switch nd := n.(type) {
 		case *dag.ProtoNode:
-			pbn, err := ft.FromBytes(nd.Data())
+			fsn, err := ft.FSNodeFromBytes(nd.Data())
 			if err != nil {
 				return err
 			}
 
-			if pbn.GetType() != ft.TRaw {
+			if fsn.Type() != ft.TRaw {
 				return errors.New("expected raw block")
 			}
 
@@ -325,16 +325,16 @@ func verifyTDagRec(n ipld.Node, depth int, p VerifyParams) error {
 	}
 
 	// Verify this is a branch node
-	pbn, err := ft.FromBytes(nd.Data())
+	fsn, err := ft.FSNodeFromBytes(nd.Data())
 	if err != nil {
 		return err
 	}
 
-	if pbn.GetType() != ft.TFile {
-		return fmt.Errorf("expected file as branch node, got: %s", pbn.GetType())
+	if fsn.Type() != ft.TFile {
+		return fmt.Errorf("expected file as branch node, got: %s", fsn.Type())
 	}
 
-	if len(pbn.Data) > 0 {
+	if len(fsn.Data()) > 0 {
 		return errors.New("branch node should not have data")
 	}
 

io/resolve.go

@@ -15,7 +15,7 @@ import (
 func ResolveUnixfsOnce(ctx context.Context, ds ipld.NodeGetter, nd ipld.Node, names []string) (*ipld.Link, []string, error) {
 	switch nd := nd.(type) {
 	case *dag.ProtoNode:
-		upb, err := ft.FromBytes(nd.Data())
+		fsn, err := ft.FSNodeFromBytes(nd.Data())
 		if err != nil {
 			// Not a unixfs node, use standard object traversal code
 			lnk, err := nd.GetNodeLink(names[0])
@@ -26,7 +26,7 @@ func ResolveUnixfsOnce(ctx context.Context, ds ipld.NodeGetter, nd ipld.Node, na
 			return lnk, names[1:], nil
 		}
 
-		switch upb.GetType() {
+		switch fsn.Type() {
 		case ft.THAMTShard:
 			rods := dag.NewReadOnlyDagService(ds)
 			s, err := hamt.NewHamtFromDag(rods, nd)

mod/dagmodifier.go

@@ -13,7 +13,6 @@ import (
 	trickle "github.com/ipfs/go-unixfs/importer/trickle"
 	uio "github.com/ipfs/go-unixfs/io"
 
-	proto "github.com/gogo/protobuf/proto"
 	cid "github.com/ipfs/go-cid"
 	chunker "github.com/ipfs/go-ipfs-chunker"
 	ipld "github.com/ipfs/go-ipld-format"
@@ -173,11 +172,11 @@ func (dm *DagModifier) Size() (int64, error) {
 func fileSize(n ipld.Node) (uint64, error) {
 	switch nd := n.(type) {
 	case *mdag.ProtoNode:
-		f, err := ft.FromBytes(nd.Data())
+		fsn, err := ft.FSNodeFromBytes(nd.Data())
 		if err != nil {
 			return 0, err
 		}
-		return f.GetFilesize(), nil
+		return fsn.FileSize(), nil
 	case *mdag.RawNode:
 		return uint64(len(nd.RawData())), nil
 	default:
@@ -238,18 +237,18 @@ func (dm *DagModifier) modifyDag(n ipld.Node, offset uint64) (cid.Cid, error) {
 	if len(n.Links()) == 0 {
 		switch nd0 := n.(type) {
 		case *mdag.ProtoNode:
-			f, err := ft.FromBytes(nd0.Data())
+			fsn, err := ft.FSNodeFromBytes(nd0.Data())
 			if err != nil {
 				return cid.Cid{}, err
 			}
 
-			_, err = dm.wrBuf.Read(f.Data[offset:])
+			_, err = dm.wrBuf.Read(fsn.Data()[offset:])
 			if err != nil && err != io.EOF {
 				return cid.Cid{}, err
 			}
 
 			// Update newly written node..
-			b, err := proto.Marshal(f)
+			b, err := fsn.GetBytes()
 			if err != nil {
 				return cid.Cid{}, err
 			}
@@ -300,13 +299,13 @@ func (dm *DagModifier) modifyDag(n ipld.Node, offset uint64) (cid.Cid, error) {
 		return cid.Cid{}, ErrNotUnixfs
 	}
 
-	f, err := ft.FromBytes(node.Data())
+	fsn, err := ft.FSNodeFromBytes(node.Data())
 	if err != nil {
 		return cid.Cid{}, err
 	}
 
 	var cur uint64
-	for i, bs := range f.GetBlocksizes() {
+	for i, bs := range fsn.BlockSizes() {
 		// We found the correct child to write into
 		if cur+bs > offset {
 			child, err := node.Links()[i].GetNode(dm.ctx, dm.dagserv)
@@ -510,11 +509,11 @@ func (dm *DagModifier) dagTruncate(ctx context.Context, n ipld.Node, size uint64
 		switch nd := n.(type) {
 		case *mdag.ProtoNode:
 			// TODO: this can likely be done without marshaling and remarshaling
-			pbn, err := ft.FromBytes(nd.Data())
+			fsn, err := ft.FSNodeFromBytes(nd.Data())
 			if err != nil {
 				return nil, err
 			}
-			nd.SetData(ft.WrapData(pbn.Data[:size]))
+			nd.SetData(ft.WrapData(fsn.Data()[:size]))
 			return nd, nil
 		case *mdag.RawNode:
 			return mdag.NewRawNodeWPrefix(nd.RawData()[:size], nd.Cid().Prefix())

test/utils.go

@@ -107,15 +107,15 @@ func ArrComp(a, b []byte) error {
 
 // PrintDag pretty-prints the given dag to stdout.
 func PrintDag(nd *mdag.ProtoNode, ds ipld.DAGService, indent int) {
-	pbd, err := ft.FromBytes(nd.Data())
+	fsn, err := ft.FSNodeFromBytes(nd.Data())
 	if err != nil {
 		panic(err)
 	}
 
 	for i := 0; i < indent; i++ {
 		fmt.Print(" ")
 	}
-	fmt.Printf("{size = %d, type = %s, children = %d", pbd.GetFilesize(), pbd.GetType().String(), len(pbd.GetBlocksizes()))
+	fmt.Printf("{size = %d, type = %s, children = %d", fsn.FileSize(), fsn.Type().String(), fsn.NumChildren())
 	if len(nd.Links()) > 0 {
 		fmt.Println()
 	}

unixfs.go

@@ -29,6 +29,7 @@ var (
 )
 
 // FromBytes unmarshals a byte slice as protobuf Data.
+// Deprecated: Use `FSNodeFromBytes` instead to avoid direct manipulation of `pb.Data`.
 func FromBytes(data []byte) (*pb.Data, error) {
 	pbdata := new(pb.Data)
 	err := proto.Unmarshal(data, pbdata)
@@ -182,6 +183,16 @@ func NewFSNode(dataType pb.Data_DataType) *FSNode {
 	return n
 }
 
+// HashType gets hash type of format
+func (n *FSNode) HashType() uint64 {
+	return n.format.GetHashType()
+}
+
+// Fanout gets fanout of format
+func (n *FSNode) Fanout() uint64 {
+	return n.format.GetFanout()
+}
+
 // AddBlockSize adds the size of the next child block of this node
 func (n *FSNode) AddBlockSize(s uint64) {
 	n.UpdateFilesize(int64(s))
@@ -200,6 +211,11 @@ func (n *FSNode) BlockSize(i int) uint64 {
 	return n.format.Blocksizes[i]
 }
 
+// BlockSizes gets blocksizes of format
+func (n *FSNode) BlockSizes() []uint64 {
+	return n.format.GetBlocksizes()
+}
+
 // RemoveAllBlockSizes removes all the child block sizes of this node.
 func (n *FSNode) RemoveAllBlockSizes() {
 	n.format.Blocksizes = []uint64{}

unixfs_test.go

@@ -76,12 +76,12 @@ func TestPBdataTools(t *testing.T) {
 		t.Fatal("Unwrap failed to produce the correct wrapped data.")
 	}
 
-	rawPBdata, err := FromBytes(rawPB)
+	rawPBdata, err := FSNodeFromBytes(rawPB)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	isRaw := rawPBdata.GetType() == TRaw
+	isRaw := rawPBdata.Type() == TRaw
 	if !isRaw {
 		t.Fatal("WrapData does not create pb.Data_Raw!")
 	}
@@ -97,8 +97,8 @@ func TestPBdataTools(t *testing.T) {
 	}
 
 	dirPB := FolderPBData()
-	dir, err := FromBytes(dirPB)
-	isDir := dir.GetType() == TDirectory
+	dir, err := FSNodeFromBytes(dirPB)
+	isDir := dir.Type() == TDirectory
 	if !isDir {
 		t.Fatal("FolderPBData does not create a directory!")
 	}
@@ -115,8 +115,8 @@ func TestPBdataTools(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	catSymPB, err := FromBytes(catSym)
-	isSym := catSymPB.GetType() == TSymlink
+	catSymPB, err := FSNodeFromBytes(catSym)
+	isSym := catSymPB.Type() == TSymlink
 	if !isSym {
 		t.Fatal("Failed to make a Symlink.")
 	}