// NewUnixfsNodeFromDag reconstructs a Unixfs node from a given dag node
func NewUnixfsNodeFromDag(nd *dag.Node) (*UnixfsNode, error) {
mb, err := ft.FSNodeFromBytes(nd.Data)
if err != nil {
return nil, err
}
return &UnixfsNode{
node: nd,
ufmt: mb,
}, nil
}
func (fi *File) Open(flags int, sync bool) (FileDescriptor, error) {
fi.nodelk.Lock()
node := fi.node
fi.nodelk.Unlock()
switch node := node.(type) {
case *dag.ProtoNode:
fsn, err := ft.FSNodeFromBytes(node.Data())
if err != nil {
return nil, err
}
switch fsn.Type {
default:
return nil, fmt.Errorf("unsupported fsnode type for 'file'")
case ft.TSymlink:
return nil, fmt.Errorf("symlinks not yet supported")
case ft.TFile, ft.TRaw:
// OK case
}
case *dag.RawNode:
// Ok as well.
}
switch flags {
case OpenReadOnly:
fi.desclock.RLock()
case OpenWriteOnly, OpenReadWrite:
fi.desclock.Lock()
default:
// TODO: support other modes
return nil, fmt.Errorf("mode not supported")
}
dmod, err := mod.NewDagModifier(context.TODO(), node, fi.dserv, chunk.DefaultSplitter)
if err != nil {
return nil, err
}
return &fileDescriptor{
inode: fi,
perms: flags,
sync: sync,
mod: dmod,
}, nil
}
func TestFlushing(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
_, rt := setupRoot(ctx, t)
dir := rt.GetValue().(*Directory)
c := mkdirP(t, dir, "a/b/c")
d := mkdirP(t, dir, "a/b/d")
e := mkdirP(t, dir, "a/b/e")
data := []byte("this is a test\n")
nd1 := &dag.Node{Data: ft.FilePBData(data, uint64(len(data)))}
if err := c.AddChild("TEST", nd1); err != nil {
t.Fatal(err)
}
if err := d.AddChild("TEST", nd1); err != nil {
t.Fatal(err)
}
if err := e.AddChild("TEST", nd1); err != nil {
t.Fatal(err)
}
if err := dir.AddChild("FILE", nd1); err != nil {
t.Fatal(err)
}
if err := FlushPath(rt, "/a/b/c/TEST"); err != nil {
t.Fatal(err)
}
if err := FlushPath(rt, "/a/b/d/TEST"); err != nil {
t.Fatal(err)
}
if err := FlushPath(rt, "/a/b/e/TEST"); err != nil {
t.Fatal(err)
}
if err := FlushPath(rt, "/FILE"); err != nil {
t.Fatal(err)
}
rnd, err := dir.GetNode()
if err != nil {
t.Fatal(err)
}
fsnode, err := ft.FSNodeFromBytes(rnd.Data)
if err != nil {
t.Fatal(err)
}
if fsnode.Type != ft.TDirectory {
t.Fatal("root wasnt a directory")
}
rnk, err := rnd.Key()
if err != nil {
t.Fatal(err)
}
exp := "QmWMVyhTuyxUrXX3ynz171jq76yY3PktfY9Bxiph7b9ikr"
if rnk.B58String() != exp {
t.Fatalf("dag looks wrong, expected %s, but got %s", exp, rnk.B58String())
}
}