forked from cerc-io/ipld-eth-server
42 lines
982 B
Go
42 lines
982 B
Go
package io
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import (
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"context"
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dag "github.com/ipfs/go-merkledag"
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ft "github.com/ipfs/go-unixfs"
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hamt "github.com/ipfs/go-unixfs/hamt"
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ipld "github.com/ipfs/go-ipld-format"
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)
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// ResolveUnixfsOnce resolves a single hop of a path through a graph in a
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// unixfs context. This includes handling traversing sharded directories.
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func ResolveUnixfsOnce(ctx context.Context, ds ipld.NodeGetter, nd ipld.Node, names []string) (*ipld.Link, []string, error) {
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pn, ok := nd.(*dag.ProtoNode)
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if ok {
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fsn, err := ft.FSNodeFromBytes(pn.Data())
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if err != nil {
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// Not a unixfs node, use standard object traversal code
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return nd.ResolveLink(names)
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}
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if fsn.Type() == ft.THAMTShard {
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rods := dag.NewReadOnlyDagService(ds)
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s, err := hamt.NewHamtFromDag(rods, nd)
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if err != nil {
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return nil, nil, err
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}
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out, err := s.Find(ctx, names[0])
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if err != nil {
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return nil, nil, err
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}
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return out, names[1:], nil
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}
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}
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return nd.ResolveLink(names)
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}
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