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resolve.go
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/
resolve.go
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package io
import (
"context"
dag "github.com/ipfs/go-ipfs/merkledag"
ft "github.com/ipfs/go-ipfs/unixfs"
hamt "github.com/ipfs/go-ipfs/unixfs/hamt"
node "gx/ipfs/QmYDscK7dmdo2GZ9aumS8s5auUUAH5mR1jvj5pYhWusfK7/go-ipld-node"
)
func ResolveUnixfsOnce(ctx context.Context, ds dag.DAGService, nd node.Node, name string) (*node.Link, error) {
switch nd := nd.(type) {
case *dag.ProtoNode:
upb, err := ft.FromBytes(nd.Data())
if err != nil {
// Not a unixfs node, use standard object traversal code
return nd.GetNodeLink(name)
}
switch upb.GetType() {
case ft.THAMTShard:
s, err := hamt.NewHamtFromDag(ds, nd)
if err != nil {
return nil, err
}
// TODO: optimized routine on HAMT for returning a dag.Link to avoid extra disk hits
out, err := s.Find(ctx, name)
if err != nil {
return nil, err
}
return node.MakeLink(out)
default:
return nd.GetNodeLink(name)
}
default:
lnk, _, err := nd.ResolveLink([]string{name})
if err != nil {
return nil, err
}
return lnk, nil
}
}