feat: precompile the matchAll selector

helpers/traversal.go

@@ -10,6 +10,16 @@ import (
 	"github.com/ipld/go-ipld-prime/traversal/selector/builder"
 )
 
+var matchAllSelector ipld.Node
+
+func init() {
+	ssb := builder.NewSelectorSpecBuilder(basicnode.Prototype.Any)
+	matchAllSelector = ssb.ExploreRecursive(selector.RecursionLimitNone(), ssb.ExploreUnion(
+		ssb.Matcher(),
+		ssb.ExploreAll(ssb.ExploreRecursiveEdge()),
+	)).Node()
+}
+
 // Block fetches a schemaless node graph corresponding to single block by link.
 func Block(ctx context.Context, f fetcher.Fetcher, link ipld.Link) (ipld.Node, error) {
 	prototype, err := f.PrototypeFromLink(link)
@@ -28,11 +38,5 @@ func BlockMatching(ctx context.Context, f fetcher.Fetcher, root ipld.Link, match
 // BlockAll traverses all nodes in the graph linked by root. The nodes will be untyped and send over the results
 // channel.
 func BlockAll(ctx context.Context, f fetcher.Fetcher, root ipld.Link, cb fetcher.FetchCallback) error {
-	ssb := builder.NewSelectorSpecBuilder(basicnode.Prototype.Any)
-	allSelector := ssb.ExploreRecursive(selector.RecursionLimitNone(), ssb.ExploreUnion(
-		ssb.Matcher(),
-		ssb.ExploreAll(ssb.ExploreRecursiveEdge()),
-	)).Node()
-
-	return f.BlockMatchingOfType(ctx, root, allSelector, nil, cb)
+	return f.BlockMatchingOfType(ctx, root, matchAllSelector, nil, cb)
 }