api, netstore: dont set empty targets, return correct errors from netstore (#747)

* dont set empty targets, return correct errors from netstore

pkg/api/bzz.go

@@ -28,7 +28,9 @@ import (
 func (s *server) bzzDownloadHandler(w http.ResponseWriter, r *http.Request) {
 	logger := tracing.NewLoggerWithTraceID(r.Context(), s.Logger)
 	targets := r.URL.Query().Get("targets")
+	if targets != "" {
 		r = r.WithContext(sctx.SetTargets(r.Context(), targets))
+	}
 	ctx := r.Context()
 
 	nameOrHex := mux.Vars(r)["address"]

pkg/api/chunk.go

@@ -96,7 +96,9 @@ func (s *server) chunkUploadHandler(w http.ResponseWriter, r *http.Request) {
 
 func (s *server) chunkGetHandler(w http.ResponseWriter, r *http.Request) {
 	targets := r.URL.Query().Get("targets")
+	if targets != "" {
 		r = r.WithContext(sctx.SetTargets(r.Context(), targets))
+	}
 
 	nameOrHex := mux.Vars(r)["addr"]
 	ctx := r.Context()

pkg/api/file.go

@@ -242,7 +242,9 @@ func (s *server) fileDownloadHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	targets := r.URL.Query().Get("targets")
+	if targets != "" {
 		r = r.WithContext(sctx.SetTargets(r.Context(), targets))
+	}
 
 	// read entry.
 	j := seekjoiner.NewSimpleJoiner(s.Storer)
@@ -303,7 +305,9 @@ func (s *server) fileDownloadHandler(w http.ResponseWriter, r *http.Request) {
 func (s *server) downloadHandler(w http.ResponseWriter, r *http.Request, reference swarm.Address, additionalHeaders http.Header) {
 	logger := tracing.NewLoggerWithTraceID(r.Context(), s.Logger)
 	targets := r.URL.Query().Get("targets")
+	if targets != "" {
 		r = r.WithContext(sctx.SetTargets(r.Context(), targets))
+	}
 
 	rs := seekjoiner.NewSimpleJoiner(s.Storer)
 	reader, l, err := rs.Join(r.Context(), reference)

pkg/netstore/netstore.go

@@ -47,10 +47,8 @@ func (s *store) Get(ctx context.Context, mode storage.ModeGet, addr swarm.Addres
 				if s.recoveryCallback == nil {
 					return nil, err
 				}
-				targets, err := sctx.GetTargets(ctx)
-				if err != nil {
-					return nil, err
-				}
+				targets := sctx.GetTargets(ctx)
+				if targets != nil {
 					go func() {
 						err := s.recoveryCallback(addr, targets)
 						if err != nil {
@@ -59,6 +57,9 @@ func (s *store) Get(ctx context.Context, mode storage.ModeGet, addr swarm.Addres
 					}()
 					return nil, ErrRecoveryAttempt
 				}
+				return nil, fmt.Errorf("netstore retrieve chunk: %w", err)
+			}
+
 			_, err = s.Storer.Put(ctx, storage.ModePutRequest, ch)
 			if err != nil {
 				return nil, fmt.Errorf("netstore retrieve put: %w", err)

pkg/netstore/netstore_test.go

@@ -135,24 +135,6 @@ func TestInvalidRecoveryFunction(t *testing.T) {
 	}
 }
 
-func TestInvalidTargets(t *testing.T) {
-	hookWasCalled := make(chan bool, 1)
-	rec := &mockRecovery{
-		hookC: hookWasCalled,
-	}
-
-	retrieve, _, nstore := newRetrievingNetstore(rec)
-	addr := swarm.MustParseHexAddress("deadbeef")
-	retrieve.failure = true
-	ctx := context.Background()
-	ctx = sctx.SetTargets(ctx, "gh")
-
-	_, err := nstore.Get(ctx, storage.ModeGetRequest, addr)
-	if err != nil && !errors.Is(err, sctx.ErrTargetPrefix) {
-		t.Fatal(err)
-	}
-}
-
 // returns a mock retrieval protocol, a mock local storage and a netstore
 func newRetrievingNetstore(rec *mockRecovery) (ret *retrievalMock, mockStore, ns storage.Storer) {
 	retrieve := &retrievalMock{}

pkg/recovery/repair_test.go

@@ -69,15 +69,9 @@ func TestRecoveryHookCalls(t *testing.T) {
 	target := "BE"
 
 	// test cases variables
-	dummyContext := context.Background() // has no publisher
 	targetContext := sctx.SetTargets(context.Background(), target)
 
 	for _, tc := range []recoveryHookTestCase{
-		{
-			name:           "no targets in context",
-			ctx:            dummyContext,
-			expectsFailure: true,
-		},
 		{
 			name:           "targets set in context",
 			ctx:            targetContext,

pkg/sctx/sctx.go

@@ -63,10 +63,10 @@ func SetTargets(ctx context.Context, targets string) context.Context {
 
 // GetTargets returns the specific target pinners for a corresponding chunk by
 // reading the prefix targets sent in the download API.
-func GetTargets(ctx context.Context) (trojan.Targets, error) {
+func GetTargets(ctx context.Context) trojan.Targets {
 	targetString, ok := ctx.Value(targetsContextKey{}).(string)
 	if !ok {
-		return nil, ErrTargetPrefix
+		return nil
 	}
 
 	prefixes := strings.Split(targetString, ",")
@@ -80,7 +80,7 @@ func GetTargets(ctx context.Context) (trojan.Targets, error) {
 		targets = append(targets, target)
 	}
 	if len(targets) <= 0 {
-		return nil, ErrTargetPrefix
+		return nil
 	}
-	return targets, nil
+	return targets
 }