Add checkrequest networkservice chain element

pkg/networkservice/utils/checks/checkrequest/client.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2020 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 checkrequest - provides networkservice chain elements to check the request received from the previous element in the chain
+package checkrequest
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/networkservicemesh/api/pkg/api/networkservice"
+	"google.golang.org/grpc"
+
+	"github.com/networkservicemesh/sdk/pkg/networkservice/core/next"
+)
+
+type checkRequestAfterClient struct {
+	*testing.T
+	check func(*testing.T, *networkservice.NetworkServiceRequest)
+}
+
+// NewClient - returns NetworkServiceClient chain elements to check the request received from the previous element in the chain
+//             t - *testing.T for checks
+//             check - function to check the NetworkServiceRequest
+func NewClient(t *testing.T, check func(*testing.T, *networkservice.NetworkServiceRequest)) networkservice.NetworkServiceClient {
+	return &checkRequestAfterClient{
+		T:     t,
+		check: check,
+	}
+}
+
+func (c *checkRequestAfterClient) Request(ctx context.Context, request *networkservice.NetworkServiceRequest, opts ...grpc.CallOption) (*networkservice.Connection, error) {
+	c.check(c.T, request)
+	return next.Client(ctx).Request(ctx, request, opts...)
+}
+
+func (c *checkRequestAfterClient) Close(ctx context.Context, conn *networkservice.Connection, opts ...grpc.CallOption) (*empty.Empty, error) {
+	return next.Client(ctx).Close(ctx, conn, opts...)
+}

pkg/networkservice/utils/checks/checkrequest/server.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2020 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 checkrequest
+
+import (
+	"context"
+	"testing"
+
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/networkservicemesh/api/pkg/api/networkservice"
+
+	"github.com/networkservicemesh/sdk/pkg/networkservice/core/next"
+)
+
+type checkRequestAfterServer struct {
+	*testing.T
+	check func(*testing.T, *networkservice.NetworkServiceRequest)
+}
+
+// NewServer - returns NetworkServiceServer chain elements to check the request received from the previous element in the chain
+//             t - *testing.T for checks
+//             check - function to check the NetworkServiceRequest
+func NewServer(t *testing.T, check func(*testing.T, *networkservice.NetworkServiceRequest)) networkservice.NetworkServiceServer {
+	return &checkRequestAfterServer{
+		T:     t,
+		check: check,
+	}
+}
+
+func (c *checkRequestAfterServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) {
+	c.check(c.T, request)
+	return next.Server(ctx).Request(ctx, request)
+}
+
+func (c *checkRequestAfterServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) {
+	return next.Server(ctx).Close(ctx, conn)
+}