fix: partial revert of 1be7c1a20; make traverser process identity CIDs

impl/graphsync_test.go

@@ -383,8 +383,8 @@ func TestGraphsyncIdentityCIDRoundTrip(t *testing.T) {
 	})
 	progressChan, errChan := requestor.Request(ctx, td.host2.ID(), identityDag.RootLink, selectorparse.CommonSelector_ExploreAllRecursively)
 
-	identityDag.VerifyWholeDAG(ctx, progressChan)
 	testutil.VerifyEmptyErrors(ctx, t, errChan)
+	identityDag.VerifyWholeDAG(ctx, progressChan)
 	require.Len(t, td.blockStore1, len(identityDag.AllLinks), "did not store all blocks")
 
 	// verify listener

ipldutil/traverser.go

@@ -1,7 +1,6 @@
 package ipldutil
 
 import (
-	"bytes"
 	"context"
 	"errors"
 	"io"
@@ -13,9 +12,7 @@ import (
 	"github.com/ipld/go-ipld-prime/node/basicnode"
 	"github.com/ipld/go-ipld-prime/traversal"
 	"github.com/ipld/go-ipld-prime/traversal/selector"
-	"github.com/multiformats/go-multihash"
 
-	"github.com/ipfs/go-cid"
 	"github.com/ipfs/go-graphsync/panics"
 )
 
@@ -168,23 +165,7 @@ func (t *traverser) NBlocksTraversed() int {
 	return t.blocksCount
 }
 
-func asIdentity(c cid.Cid) (digest []byte, ok bool, err error) {
-	dmh, err := multihash.Decode(c.Hash())
-	if err != nil {
-		return nil, false, err
-	}
-	ok = dmh.Code == multihash.IDENTITY
-	digest = dmh.Digest
-	return digest, ok, nil
-}
-
 func (t *traverser) loader(lnkCtx ipld.LinkContext, lnk ipld.Link) (io.Reader, error) {
-	if digest, ok, err := asIdentity(lnk.(cidlink.Link).Cid); ok {
-		return io.NopCloser(bytes.NewReader(digest)), nil
-	} else if err != nil {
-		return nil, err
-	}
-
 	// A StorageReadOpener call came in; update the state and release the lock.
 	// We can't simply unlock the mutex inside the <-t.responses case,
 	// as then we'd deadlock with the other side trying to send.

testutil/identity.go

@@ -28,15 +28,17 @@ type TestIdentityDAG struct {
 	t      testing.TB
 	loader ipld.BlockReadOpener
 
-	RootLink ipld.Link
-	AllLinks []ipld.Link
+	RootLink        ipld.Link
+	AllLinks        []ipld.Link
+	AllLinksNoIdent []ipld.Link
 }
 
 /* ugly, but it makes a DAG with paths that look like this but doesn't involved dag-pb or unixfs */
-var identityDagPaths = []string{
+var identityDagLinkPaths = []string{
 	"",
 	"a/!foo",
 	"a/b/!bar",
+	"a/b/c/!baz", // identity
 	"a/b/c/!baz/identity jump",
 	"a/b/c/!baz/identity jump/these are my children/blip",
 	"a/b/c/!baz/identity jump/these are my children/bloop",
@@ -49,13 +51,15 @@ var identityDagPaths = []string{
 func SetupIdentityDAG(
 	ctx context.Context,
 	t testing.TB,
-	lsys ipld.LinkSystem) *TestIdentityDAG {
-
+	lsys ipld.LinkSystem,
+) *TestIdentityDAG {
 	allLinks := make([]ipld.Link, 0)
+	allLinksNoIdent := make([]ipld.Link, 0)
 	store := func(lp datamodel.LinkPrototype, n datamodel.Node) datamodel.Link {
 		l, err := lsys.Store(linking.LinkContext{}, lp, n)
 		require.NoError(t, err)
 		allLinks = append(allLinks, l)
+		allLinksNoIdent = append(allLinksNoIdent, l)
 		return l
 	}
 
@@ -98,6 +102,11 @@ func SetupIdentityDAG(
 		identBytes := must(ipld.Encode(ident, dagjson.Encode))(t)
 		mh := must(multihash.Sum(identBytes, multihash.IDENTITY, len(identBytes)))(t)
 		bazIdent = cidlink.Link{Cid: cid.NewCidV1(cid.DagJSON, mh)}
+		w, wc, err := lsys.StorageWriteOpener(linking.LinkContext{})
+		require.NoError(t, err)
+		w.Write(identBytes)
+		require.NoError(t, wc(bazIdent))
+		allLinks = append(allLinks, bazIdent)
 	}
 	bar := store(djlp, basicnode.NewInt(2020202020202020))
 	foo := store(djlp, basicnode.NewInt(1010101010101010))
@@ -117,10 +126,11 @@ func SetupIdentityDAG(
 	}))(t))
 
 	return &TestIdentityDAG{
-		t:        t,
-		loader:   lsys.StorageReadOpener,
-		RootLink: root,
-		AllLinks: reverse(allLinks), // TODO: slices.Reverse post 1.21
+		t:               t,
+		loader:          lsys.StorageReadOpener,
+		RootLink:        root,
+		AllLinks:        reverse(allLinks), // TODO: slices.Reverse post 1.21
+		AllLinksNoIdent: reverse(allLinksNoIdent),
 	}
 }
 
@@ -150,15 +160,15 @@ func (tid *TestIdentityDAG) checkResponses(responses []graphsync.ResponseProgres
 	for ii, response := range responses {
 		// only check the paths that have links, assume the rest are just describing
 		// the non-link nodes of the DAG
-		if response.Path.String() == identityDagPaths[pathIndex] {
+		if response.Path.String() == identityDagLinkPaths[pathIndex] {
 			if response.LastBlock.Link != nil {
 				expectedLink := tid.AllLinks[pathIndex]
 				require.Equal(tid.t, expectedLink.String(), response.LastBlock.Link.String(), fmt.Sprintf("response %d has correct link (%d)", ii, pathIndex))
 			}
 			pathIndex++
 		}
 	}
-	require.Equal(tid.t, len(identityDagPaths), pathIndex, "traverses all nodes")
+	require.Equal(tid.t, len(identityDagLinkPaths), pathIndex, "traverses all nodes")
 }
 
 func must[T any](v T, err error) func(t testing.TB) T {