Remove duplicated IPAM code for NSE applications

NSM issue link: networkservicemesh/sdk#1409

Signed-off-by: Botond Szirtes <botond.szirtes@est.tech>

internal/pkg/config/config.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2021-2022 Nordix Foundation.
+// Copyright (c) 2021-2024 Nordix Foundation.
 //
 // Copyright (c) 2023 Cisco and/or its affiliates.
 //
@@ -26,6 +26,7 @@ import (
 	"time"
 
 	"github.com/kelseyhightower/envconfig"
+	"github.com/networkservicemesh/sdk/pkg/tools/cidr"
 	"github.com/pkg/errors"
 )
 
@@ -44,7 +45,7 @@ type Config struct {
 	ConnectTo              url.URL         `default:"nsm-registry-svc:5002" desc:"url of registry service to connect to" split_words:"true"`
 	MaxTokenLifetime       time.Duration   `default:"24h" desc:"maximum lifetime of tokens" split_words:"true"`
 	RegistryClientPolicies []string        `default:"etc/nsm/opa/common/.*.rego,etc/nsm/opa/registry/.*.rego,etc/nsm/opa/client/.*.rego" desc:"paths to files and directories that contain registry client policies" split_words:"true"`
-	CidrPrefix             []string        `default:"169.254.0.0/16" desc:"CIDR Prefix to assign IPs (IPv4 and/or IPv6) from" split_words:"true"`
+	CidrPrefix             cidr.Groups     `default:"169.254.0.0/16" desc:"CIDR Prefix to assign IPs (IPv4 and/or IPv6) from" split_words:"true"`
 	RegisterService        bool            `default:"true" desc:"if true then registers network service on startup" split_words:"true"`
 	ListenOn               url.URL         `default:"tcp://:5003" desc:"tcp:// url to be listen on. It will be used as public to register NSM" split_words:"true"`
 	OpenTelemetryEndpoint  string          `default:"otel-collector.observability.svc.cluster.local:4317" desc:"OpenTelemetry Collector Endpoint"`

internal/pkg/imports/imports_linux.go

@@ -17,13 +17,14 @@ import (
 	_ "github.com/networkservicemesh/sdk/pkg/networkservice/common/mechanisms"
 	_ "github.com/networkservicemesh/sdk/pkg/networkservice/common/mechanisms/recvfd"
 	_ "github.com/networkservicemesh/sdk/pkg/networkservice/common/mechanisms/sendfd"
-	_ "github.com/networkservicemesh/sdk/pkg/networkservice/core/chain"
 	_ "github.com/networkservicemesh/sdk/pkg/networkservice/core/next"
+	_ "github.com/networkservicemesh/sdk/pkg/networkservice/ipam/groupipam"
 	_ "github.com/networkservicemesh/sdk/pkg/networkservice/ipam/singlepointipam"
 	_ "github.com/networkservicemesh/sdk/pkg/registry/chains/client"
 	_ "github.com/networkservicemesh/sdk/pkg/registry/common/authorize"
 	_ "github.com/networkservicemesh/sdk/pkg/registry/common/clientinfo"
 	_ "github.com/networkservicemesh/sdk/pkg/registry/common/sendfd"
+	_ "github.com/networkservicemesh/sdk/pkg/tools/cidr"
 	_ "github.com/networkservicemesh/sdk/pkg/tools/debug"
 	_ "github.com/networkservicemesh/sdk/pkg/tools/grpcutils"
 	_ "github.com/networkservicemesh/sdk/pkg/tools/listenonurl"

main.go

@@ -1,5 +1,6 @@
 // Copyright (c) 2021-2022 Doc.ai and/or its affiliates.
-// Copyright (c) 2021-2022 Nordix and/or its affiliates.
+//
+// Copyright (c) 2021-2024 Nordix and/or its affiliates.
 //
 // Copyright (c) 2023 Cisco and/or its affiliates.
 //
@@ -28,7 +29,6 @@ import (
 	"net/url"
 	"os"
 	"os/signal"
-	"strings"
 	"syscall"
 	"time"
 
@@ -50,7 +50,7 @@ import (
 	"github.com/networkservicemesh/sdk/pkg/networkservice/common/mechanisms"
 	"github.com/networkservicemesh/sdk/pkg/networkservice/common/mechanisms/recvfd"
 	"github.com/networkservicemesh/sdk/pkg/networkservice/common/mechanisms/sendfd"
-	"github.com/networkservicemesh/sdk/pkg/networkservice/core/chain"
+	"github.com/networkservicemesh/sdk/pkg/networkservice/ipam/groupipam"
 	"github.com/networkservicemesh/sdk/pkg/networkservice/ipam/singlepointipam"
 	registryclient "github.com/networkservicemesh/sdk/pkg/registry/chains/client"
 	registryauthorize "github.com/networkservicemesh/sdk/pkg/registry/common/authorize"
@@ -99,10 +99,9 @@ func main() {
 	logger.Infof("the phases include:")
 	logger.Infof("1: get config from environment")
 	logger.Infof("2: retrieve spiffe svid")
-	logger.Infof("3: parse network prefixes for ipam")
-	logger.Infof("4: create network service endpoint")
-	logger.Infof("5: create grpc server and register the server")
-	logger.Infof("6: register nse with nsm")
+	logger.Infof("3: create network service endpoint")
+	logger.Infof("4: create grpc server and register the server")
+	logger.Infof("5: register nse with nsm")
 	logger.Infof("a final success message with start time duration")
 	starttime := time.Now()
 
@@ -156,30 +155,22 @@ func main() {
 	tlsServerConfig.MinVersion = tls.VersionTLS12
 
 	// ********************************************************************************
-	log.FromContext(ctx).Infof("executing phase 3: parsing network prefixes for ipam")
-	// ********************************************************************************
-
-	ipamChain := getIPAMChain(ctx, cfg.CidrPrefix)
-
-	log.FromContext(ctx).Infof("network prefixes parsed successfully")
-
-	// ********************************************************************************
-	logger.Infof("executing phase 4: create network service endpoint")
+	logger.Infof("executing phase 3: create network service endpoint")
 	// ********************************************************************************
 	responderEndpoint := endpoint.NewServer(ctx,
 		spiffejwt.TokenGeneratorFunc(source, cfg.MaxTokenLifetime),
 		endpoint.WithName(cfg.Name),
 		endpoint.WithAuthorizeServer(authorize.NewServer()),
 		endpoint.WithAdditionalFunctionality(
-			ipamChain,
+			groupipam.NewServer(cfg.CidrPrefix, groupipam.WithCustomIPAMServer(singlepointipam.NewServer)),
 			recvfd.NewServer(),
 			mechanisms.NewServer(map[string]networkservice.NetworkServiceServer{
 				vlanmech.MECHANISM: vlanmapserver.NewServer(cfg),
 			}),
 			sendfd.NewServer()))
 
 	// ********************************************************************************
-	logger.Infof("executing phase 5: create grpc server and register the server")
+	logger.Infof("executing phase 4: create grpc server and register the server")
 	// ********************************************************************************
 	serverCreds := grpc.Creds(
 		grpcfd.TransportCredentials(
@@ -202,7 +193,7 @@ func main() {
 	logger.Infof("grpc server started")
 
 	// ********************************************************************************
-	logger.Infof("executing phase 6: register nse with nsm")
+	logger.Infof("executing phase 5: register nse with nsm")
 	// ********************************************************************************
 
 	clientOptions := append(
@@ -316,16 +307,3 @@ func genPublishableURL(listenOn *url.URL, logger log.Logger) *url.URL {
 	}
 	return listenonurl.GetPublicURL(addrs, listenOn)
 }
-
-func getIPAMChain(ctx context.Context, cIDRs []string) networkservice.NetworkServiceServer {
-	var ipamchain []networkservice.NetworkServiceServer
-	for _, cidr := range cIDRs {
-		var parseErr error
-		_, ipNet, parseErr := net.ParseCIDR(strings.TrimSpace(cidr))
-		if parseErr != nil {
-			log.FromContext(ctx).Fatalf("Could not parse CIDR %s; %+v", cidr, parseErr)
-		}
-		ipamchain = append(ipamchain, singlepointipam.NewServer(ipNet))
-	}
-	return chain.NewNetworkServiceServer(ipamchain...)
-}