Save the IP-addresses assigned to the interface (#310)

Signed-off-by: Artem Glazychev <artem.glazychev@xored.com>

pkg/networkservice/connectioncontext/ipcontext/ipaddress/common.go

@@ -42,7 +42,22 @@ func addDel(ctx context.Context, conn *networkservice.Connection, vppConn api.Co
 	if ipNets == nil {
 		return nil
 	}
+
+	curIPs, ok := load(ctx, isClient)
 	for _, ipNet := range ipNets {
+		// Сheck if the interface already has ipNet
+		if isAdd && ok {
+			has := false
+			for _, addr := range curIPs {
+				if addr.IP.Equal(ipNet.IP) {
+					has = true
+					break
+				}
+			}
+			if has {
+				continue
+			}
+		}
 		now := time.Now()
 		if _, err := interfaces.NewServiceClient(vppConn).SwInterfaceAddDelAddress(ctx, &interfaces.SwInterfaceAddDelAddress{
 			SwIfIndex: swIfIndex,
@@ -58,5 +73,11 @@ func addDel(ctx context.Context, conn *networkservice.Connection, vppConn api.Co
 			WithField("duration", time.Since(now)).
 			WithField("vppapi", "SwInterfaceAddDelAddress").Debug("completed")
 	}
+	if isAdd {
+		store(ctx, isClient, ipNets)
+	} else {
+		delete(ctx, isClient)
+	}
+
 	return nil
 }

pkg/networkservice/connectioncontext/ipcontext/ipaddress/metadata.go

@@ -0,0 +1,43 @@
+// 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 ipaddress
+
+import (
+	"context"
+	"net"
+
+	"github.com/networkservicemesh/sdk/pkg/networkservice/utils/metadata"
+)
+
+type key struct{}
+
+func store(ctx context.Context, isClient bool, ips []*net.IPNet) {
+	metadata.Map(ctx, isClient).Store(key{}, ips)
+}
+
+func delete(ctx context.Context, isClient bool) {
+	metadata.Map(ctx, isClient).Delete(key{})
+}
+
+func load(ctx context.Context, isClient bool) (value []*net.IPNet, ok bool) {
+	rawValue, ok := metadata.Map(ctx, isClient).Load(key{})
+	if !ok {
+		return
+	}
+	value, ok = rawValue.([]*net.IPNet)
+	return value, ok
+}