Add default NSE registry client

Signed-off-by: Vladimir Popov <vladimir.popov@xored.com>

pkg/registry/chains/client/nse_client.go

@@ -0,0 +1,46 @@
+// 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 default registry clients
+package client
+
+import (
+	"context"
+
+	"github.com/networkservicemesh/api/pkg/api/registry"
+	"google.golang.org/grpc"
+
+	"github.com/networkservicemesh/sdk/pkg/registry/common/refresh"
+	"github.com/networkservicemesh/sdk/pkg/registry/common/sendfd"
+	"github.com/networkservicemesh/sdk/pkg/registry/core/chain"
+)
+
+// NewNetworkServiceEndpointClient creates a new default NSE registry client chain
+func NewNetworkServiceEndpointClient(
+	ctx context.Context,
+	cc grpc.ClientConnInterface,
+	additionalFunctionality ...registry.NetworkServiceEndpointRegistryClient,
+) registry.NetworkServiceEndpointRegistryClient {
+	return chain.NewNetworkServiceEndpointRegistryClient(
+		append(
+			append([]registry.NetworkServiceEndpointRegistryClient{
+				refresh.NewNetworkServiceEndpointRegistryClient(
+					refresh.WithChainContext(ctx)),
+				sendfd.NewNetworkServiceEndpointRegistryClient(),
+			}, additionalFunctionality...),
+			registry.NewNetworkServiceEndpointRegistryClient(cc),
+		)...)
+}

pkg/registry/common/sendfd/client.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2020 Cisco and/or its affiliates.
+// Copyright (c) 2020-2021 Cisco and/or its affiliates.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -14,10 +14,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !windows
+// +build linux
 
-// Package sendfd provides a registry.NetworkServiceEndpointRegistryClient chain element to convert any unix file socket
-// endpoint.URLs into 'inode://${dev}/${ino}' urls and send the fd over the unix file socket.
 package sendfd
 
 import (
@@ -35,7 +33,8 @@ import (
 
 type sendFDNSEClient struct{}
 
-// NewNetworkServiceEndpointRegistryClient - creates a Client that if endpoint.Url is of scheme "unix" will replace it with an "inode" scheme url and send the FD over the unix socket
+// NewNetworkServiceEndpointRegistryClient - creates a Client that if endpoint.Url is of scheme "unix" will replace it
+// with an "inode" scheme url and send the FD over the unix socket
 func NewNetworkServiceEndpointRegistryClient() registry.NetworkServiceEndpointRegistryClient {
 	return &sendFDNSEClient{}
 }

pkg/registry/common/sendfd/client_notlinux.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2020-2021 Cisco 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.
+
+// +build !linux
+
+package sendfd
+
+import (
+	"github.com/networkservicemesh/api/pkg/api/registry"
+
+	"github.com/networkservicemesh/sdk/pkg/registry/common/null"
+)
+
+// NewNetworkServiceEndpointRegistryClient - creates a Client that if endpoint.Url is of scheme "unix" will replace it
+// with an "inode" scheme url and send the FD over the unix socket
+func NewNetworkServiceEndpointRegistryClient() registry.NetworkServiceEndpointRegistryClient {
+	return null.NewNetworkServiceEndpointRegistryClient()
+}

pkg/registry/common/sendfd/doc.go

@@ -0,0 +1,19 @@
+// Copyright (c) 2020-2021 Cisco 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 sendfd provides a registry.NetworkServiceEndpointRegistryClient chain element to convert any unix file socket
+// endpoint.URLs into 'inode://${dev}/${ino}' urls and send the fd over the unix file socket.
+package sendfd