Add WithLoadSwIfIndex option to up chain element

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

pkg/networkservice/up/client.go

@@ -32,22 +32,33 @@ import (
 	"github.com/networkservicemesh/sdk/pkg/tools/postpone"
 
 	"github.com/networkservicemesh/sdk-vpp/pkg/networkservice/up/peerup"
+	"github.com/networkservicemesh/sdk-vpp/pkg/tools/ifindex"
 )
 
 type upClient struct {
 	ctx     context.Context
 	vppConn Connection
 	sync.Once
 	initErr error
+
+	loadIfIndex ifIndexFunc
 }
 
 // NewClient provides a NetworkServiceClient chain elements that 'up's the swIfIndex
-func NewClient(ctx context.Context, vppConn Connection) networkservice.NetworkServiceClient {
+func NewClient(ctx context.Context, vppConn Connection, opts ...Option) networkservice.NetworkServiceClient {
+	o := &options{
+		loadIfIndex: ifindex.Load,
+	}
+	for _, opt := range opts {
+		opt(o)
+	}
+
 	return chain.NewNetworkServiceClient(
 		peerup.NewClient(ctx, vppConn),
 		&upClient{
-			ctx:     ctx,
-			vppConn: vppConn,
+			ctx:         ctx,
+			vppConn:     vppConn,
+			loadIfIndex: o.loadIfIndex,
 		},
 	)
 }
@@ -64,7 +75,7 @@ func (u *upClient) Request(ctx context.Context, request *networkservice.NetworkS
 		return nil, err
 	}
 
-	if err := up(ctx, u.vppConn, metadata.IsClient(u)); err != nil {
+	if err := up(ctx, u.vppConn, u.loadIfIndex, metadata.IsClient(u)); err != nil {
 		closeCtx, cancelClose := postponeCtxFunc()
 		defer cancelClose()
 

pkg/networkservice/up/common.go

@@ -26,8 +26,6 @@ import (
 	"github.com/edwarnicke/govpp/binapi/interface_types"
 	"github.com/networkservicemesh/sdk/pkg/tools/log"
 	"github.com/pkg/errors"
-
-	"github.com/networkservicemesh/sdk-vpp/pkg/tools/ifindex"
 )
 
 // Connection - simply combines tha api.Connection and api.ChannelProvider interfaces
@@ -36,8 +34,8 @@ type Connection interface {
 	api.ChannelProvider
 }
 
-func up(ctx context.Context, vppConn Connection, isClient bool) error {
-	swIfIndex, ok := ifindex.Load(ctx, isClient)
+func up(ctx context.Context, vppConn Connection, loadIfIndex ifIndexFunc, isClient bool) error {
+	swIfIndex, ok := loadIfIndex(ctx, isClient)
 	if !ok {
 		return nil
 	}

pkg/networkservice/up/option.go

@@ -0,0 +1,40 @@
+// 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 up
+
+import (
+	"context"
+
+	"github.com/edwarnicke/govpp/binapi/interface_types"
+)
+
+type options struct {
+	loadIfIndex ifIndexFunc
+}
+
+// Option is an option pattern for upClient/Server
+type Option func(o *options)
+
+// ifIndexFunc is a function to load the interface index
+type ifIndexFunc func(ctx context.Context, isClient bool) (value interface_types.InterfaceIndex, ok bool)
+
+// WithLoadSwIfIndex - sets function to load the interface index
+func WithLoadSwIfIndex(f ifIndexFunc) Option {
+	return func(o *options) {
+		o.loadIfIndex = f
+	}
+}

pkg/networkservice/up/server.go

@@ -27,20 +27,32 @@ import (
 
 	"github.com/networkservicemesh/sdk/pkg/networkservice/core/next"
 	"github.com/networkservicemesh/sdk/pkg/tools/postpone"
+
+	"github.com/networkservicemesh/sdk-vpp/pkg/tools/ifindex"
 )
 
 type upServer struct {
 	ctx     context.Context
 	vppConn Connection
 	sync.Once
 	initErr error
+
+	loadIfIndex ifIndexFunc
 }
 
 // NewServer provides a NetworkServiceServer chain elements that 'up's the swIfIndex
-func NewServer(ctx context.Context, vppConn Connection) networkservice.NetworkServiceServer {
+func NewServer(ctx context.Context, vppConn Connection, opts ...Option) networkservice.NetworkServiceServer {
+	o := &options{
+		loadIfIndex: ifindex.Load,
+	}
+	for _, opt := range opts {
+		opt(o)
+	}
+
 	return &upServer{
-		ctx:     ctx,
-		vppConn: vppConn,
+		ctx:         ctx,
+		vppConn:     vppConn,
+		loadIfIndex: o.loadIfIndex,
 	}
 }
 
@@ -56,14 +68,14 @@ func (u *upServer) Request(ctx context.Context, request *networkservice.NetworkS
 		return nil, err
 	}
 
-	if err := up(ctx, u.vppConn, true); err != nil {
+	if err := up(ctx, u.vppConn, u.loadIfIndex, true); err != nil {
 		if closeErr := u.closeOnFailure(postponeCtxFunc, conn); closeErr != nil {
 			err = errors.Wrapf(err, "connection closed with error: %s", closeErr.Error())
 		}
 		return nil, err
 	}
 
-	if err := up(ctx, u.vppConn, false); err != nil {
+	if err := up(ctx, u.vppConn, u.loadIfIndex, false); err != nil {
 		if closeErr := u.closeOnFailure(postponeCtxFunc, conn); closeErr != nil {
 			err = errors.Wrapf(err, "connection closed with error: %s", closeErr.Error())
 		}