feat(bigtable/spanner): allow disable gRPC DirectPath deps (googleapis#12469)

* feat(spanner): allow disable gRPC PD deps

* feat(bigtable): allow disable gRPC PD deps

Author: giautm

bigtable/bigtable.go

@@ -47,11 +47,6 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/timestamppb"
-
-	// Install google-c2p resolver, which is required for direct path.
-	_ "google.golang.org/grpc/xds/googledirectpath"
-	// Install RLS load balancer policy, which is needed for gRPC RLS.
-	_ "google.golang.org/grpc/balancer/rls"
 )
 
 const prodAddr = "bigtable.googleapis.com:443"

bigtable/grpc_dp.go

@@ -0,0 +1,24 @@
+//go:build !disable_grpc_modules
+
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bigtable
+
+import (
+	// Install google-c2p resolver, which is required for direct path.
+	_ "google.golang.org/grpc/xds/googledirectpath"
+	// Install RLS load balancer policy, which is needed for gRPC RLS.
+	_ "google.golang.org/grpc/balancer/rls"
+)

spanner/client.go

@@ -50,11 +50,6 @@ import (
 
 	vkit "cloud.google.com/go/spanner/apiv1"
 	"cloud.google.com/go/spanner/internal"
-
-	// Install google-c2p resolver, which is required for direct path.
-	_ "google.golang.org/grpc/xds/googledirectpath"
-	// Install RLS load balancer policy, which is needed for gRPC RLS.
-	_ "google.golang.org/grpc/balancer/rls"
 )
 
 const (

spanner/grpc_dp.go

@@ -0,0 +1,24 @@
+//go:build !disable_grpc_modules
+
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package spanner
+
+import (
+	// Install google-c2p resolver, which is required for direct path.
+	_ "google.golang.org/grpc/xds/googledirectpath"
+	// Install RLS load balancer policy, which is needed for gRPC RLS.
+	_ "google.golang.org/grpc/balancer/rls"
+)