add default registry client chains

Signed-off-by: denis-tingajkin <denis.tingajkin@xored.com>

pkg/registry/chains/client/client.go

@@ -0,0 +1,63 @@
+// Copyright (c) 2021 Doc.ai and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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 client provides a simple functions for building a NetworkServiceEndpointRegistryClient, NetworkServiceRegistryClient
+package client
+
+import (
+	"context"
+
+	"github.com/networkservicemesh/api/pkg/api/registry"
+	"google.golang.org/grpc"
+
+	"github.com/networkservicemesh/sdk/pkg/registry/common/interpose"
+	"github.com/networkservicemesh/sdk/pkg/registry/common/refresh"
+	"github.com/networkservicemesh/sdk/pkg/registry/common/sendfd"
+	"github.com/networkservicemesh/sdk/pkg/registry/core/chain"
+	"github.com/networkservicemesh/sdk/pkg/registry/core/next"
+)
+
+// NewNetworkServiceEndpointRegistryClient creates a new NewNetworkServiceEndpointRegistryClient that can be used for NSE registration.
+func NewNetworkServiceEndpointRegistryClient(ctx context.Context, cc grpc.ClientConnInterface, additionalFunctionality ...registry.NetworkServiceEndpointRegistryClient) registry.NetworkServiceEndpointRegistryClient {
+	return next.NewNetworkServiceEndpointRegistryClient(
+		chain.NewNetworkServiceEndpointRegistryClient(
+			refresh.NewNetworkServiceEndpointRegistryClient(refresh.WithChainContext(ctx)),
+			sendfd.NewNetworkServiceEndpointRegistryClient(),
+		),
+		chain.NewNetworkServiceEndpointRegistryClient(
+			additionalFunctionality...,
+		),
+		chain.NewNetworkServiceEndpointRegistryClient(
+			registry.NewNetworkServiceEndpointRegistryClient(cc),
+		),
+	)
+}
+
+// NewNetworkServiceRegistryClient creates a new registry.NetworkServiceRegistryClient that can be used for registry.NetworkService registration. Can be used as for nse also for cross-nse goals.
+func NewNetworkServiceRegistryClient(cc grpc.ClientConnInterface, additionalFunctionality ...registry.NetworkServiceRegistryClient) registry.NetworkServiceRegistryClient {
+	return next.NewNetworkServiceRegistryClient(
+		chain.NewNetworkServiceRegistryClient(additionalFunctionality...),
+		chain.NewNetworkServiceRegistryClient(registry.NewNetworkServiceRegistryClient(cc)),
+	)
+}
+
+// NewNetworkServiceEndpointRegistryInterposeClient creates a new registry.NetworkServiceEndpointRegistryClient that can be used for cross-nse registration
+func NewNetworkServiceEndpointRegistryInterposeClient(ctx context.Context, cc grpc.ClientConnInterface, additionalFunctionality ...registry.NetworkServiceEndpointRegistryClient) registry.NetworkServiceEndpointRegistryClient {
+	return next.NewNetworkServiceEndpointRegistryClient(
+		interpose.NewNetworkServiceEndpointRegistryClient(),
+		NewNetworkServiceEndpointRegistryClient(ctx, cc, additionalFunctionality...),
+	)
+}