Add CID set tracking to shard enumeration

Author: hannahhoward

hamt/hamt.go

@@ -27,6 +27,7 @@ import (
 	"sync"
 
 	dag "github.com/ipfs/go-merkledag"
+
 	format "github.com/ipfs/go-unixfs"
 	upb "github.com/ipfs/go-unixfs/pb"
 
@@ -401,7 +402,9 @@ func (ds *Shard) EnumLinks(ctx context.Context) ([]*ipld.Link, error) {
 		return nil
 	})
 
-	err := dag.EnumerateChildrenAsync(ctx, getLinks, ds.nd.Cid(), func(c cid.Cid) bool { return true })
+	cset := cid.NewSet()
+
+	err := dag.EnumerateChildrenAsync(ctx, getLinks, ds.nd.Cid(), cset.Visit)
 	return links, err
 }