feat: ipam sync routine

cmd/ipam/main.go

@@ -23,7 +23,6 @@ import (
 
 	"github.com/spf13/cobra"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/health"
 	"google.golang.org/grpc/health/grpc_health_v1"
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -46,7 +45,8 @@ import (
 const leaderElectorName = "liqo-ipam-leaderelection"
 
 var (
-	scheme = runtime.NewScheme()
+	scheme  = runtime.NewScheme()
+	options ipam.Options
 )
 
 func init() {
@@ -59,8 +59,6 @@ func init() {
 // +kubebuilder:rbac:groups=apps,resources=deployments,verbs=get;list;watch;
 // +kubebuilder:rbac:groups=core,resources=pods,verbs=get;list;watch;update;patch
 
-var options ipam.Options
-
 func main() {
 	var cmd = cobra.Command{
 		Use:  "liqo-ipam",
@@ -70,7 +68,12 @@ func main() {
 	flagsutils.InitKlogFlags(cmd.Flags())
 	restcfg.InitFlags(cmd.Flags())
 
-	cmd.Flags().IntVar(&options.Port, "port", consts.IpamPort, "The port on which to listen for incoming gRPC requests.")
+	// Server options.
+	cmd.Flags().IntVar(&options.ServerOpts.Port, "port", consts.IpamPort, "The port on which to listen for incoming gRPC requests.")
+	cmd.Flags().DurationVar(&options.ServerOpts.SyncFrequency, "interval", consts.SyncFrequency,
+		"The interval at which the IPAM will synchronize the IPAM storage.")
+
+	// Leader election flags.
 	cmd.Flags().BoolVar(&options.EnableLeaderElection, "leader-election", false, "Enable leader election for IPAM. "+
 		"Enabling this will ensure there is only one active IPAM.")
 	cmd.Flags().StringVar(&options.LeaderElectionNamespace, "leader-election-namespace", consts.DefaultLiqoNamespace,
@@ -102,14 +105,14 @@ func run(cmd *cobra.Command, _ []string) error {
 
 	// Get the rest config.
 	cfg := restcfg.SetRateLimiter(ctrl.GetConfigOrDie())
-	options.Config = cfg
+
+	// Get the client.
 	cl, err := client.New(cfg, client.Options{
 		Scheme: scheme,
 	})
 	if err != nil {
 		return err
 	}
-	options.Client = cl
 
 	if options.EnableLeaderElection {
 		if leader, err := leaderelection.Blocking(ctx, cfg, record.NewBroadcaster(), &leaderelection.Opts{
@@ -129,23 +132,20 @@ func run(cmd *cobra.Command, _ []string) error {
 		}
 	}
 
-	hs := health.NewServer()
-	options.HealthServer = hs
-
-	liqoIPAM, err := ipam.New(ctx, &options)
+	liqoIPAM, err := ipam.New(ctx, cl, &options.ServerOpts)
 	if err != nil {
 		return err
 	}
 
-	lis, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", options.Port))
+	lis, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", options.ServerOpts.Port))
 	if err != nil {
 		return err
 	}
 
 	server := grpc.NewServer()
 
 	// Register health service
-	grpc_health_v1.RegisterHealthServer(server, hs)
+	grpc_health_v1.RegisterHealthServer(server, liqoIPAM.HealthServer)
 
 	// Register IPAM service
 	ipam.RegisterIPAMServer(server, liqoIPAM)

pkg/consts/ipam.go

@@ -14,12 +14,16 @@
 
 package consts
 
+import "time"
+
 // NetworkType indicates the type of Network.
 type NetworkType string
 
 const (
 	// IpamPort is the port used by the IPAM gRPC server.
-	IpamPort = 50051
+	IpamPort = 6000
+	// SyncFrequency is the frequency at which the IPAM should periodically sync its status.
+	SyncFrequency = 2 * time.Minute
 
 	// NetworkNotRemappedLabelKey is the label key used to mark a Network that does not need CIDR remapping.
 	NetworkNotRemappedLabelKey = "ipam.liqo.io/network-not-remapped"

pkg/ipam/initialize.go

@@ -18,19 +18,11 @@ import (
 	"context"
 
 	klog "k8s.io/klog/v2"
-
-	ipamv1alpha1 "github.com/liqotech/liqo/apis/ipam/v1alpha1"
-	"github.com/liqotech/liqo/pkg/consts"
 )
 
 // +kubebuilder:rbac:groups=ipam.liqo.io,resources=ips,verbs=get;list;watch
 // +kubebuilder:rbac:groups=ipam.liqo.io,resources=networks,verbs=get;list;watch
 
-type ipCidr struct {
-	ip   string
-	cidr string
-}
-
 func (lipam *LiqoIPAM) initialize(ctx context.Context) error {
 	if err := lipam.initializeNetworks(ctx); err != nil {
 		return err
@@ -45,15 +37,16 @@ func (lipam *LiqoIPAM) initialize(ctx context.Context) error {
 }
 
 func (lipam *LiqoIPAM) initializeNetworks(ctx context.Context) error {
-	// Initialize the networks.
-	nets, err := lipam.getReservedNetworks(ctx)
+	// List all networks present in the cluster.
+	nets, err := listNetworksOnCluster(ctx, lipam.Client)
 	if err != nil {
 		return err
 	}
 
+	// Initialize the networks.
 	for _, net := range nets {
 		if err := lipam.reserveNetwork(net); err != nil {
-			klog.Errorf("Failed to reserve network %s: %v", net, err)
+			klog.Errorf("Failed to reserve network %q: %v", net, err)
 			return err
 		}
 	}
@@ -62,86 +55,19 @@ func (lipam *LiqoIPAM) initializeNetworks(ctx context.Context) error {
 }
 
 func (lipam *LiqoIPAM) initializeIPs(ctx context.Context) error {
-	// Initialize the IPs.
-	ips, err := lipam.getReservedIPs(ctx)
+	// List all IPs present in the cluster.
+	ips, err := listIPsOnCluster(ctx, lipam.Client)
 	if err != nil {
 		return err
 	}
 
+	// Initialize the IPs.
 	for _, ip := range ips {
-		if err := lipam.reserveIP(ip.ip, ip.cidr); err != nil {
-			klog.Errorf("Failed to reserve IP %s in network %s: %v", ip.ip, ip.cidr, err)
+		if err := lipam.reserveIP(ip); err != nil {
+			klog.Errorf("Failed to reserve IP %q (network %q): %v", ip.ip, ip.cidr, err)
 			return err
 		}
 	}
 
 	return nil
 }
-
-func (lipam *LiqoIPAM) getReservedNetworks(ctx context.Context) ([]string, error) {
-	var nets []string
-	var networks ipamv1alpha1.NetworkList
-	if err := lipam.Options.Client.List(ctx, &networks); err != nil {
-		return nil, err
-	}
-
-	for i := range networks.Items {
-		net := &networks.Items[i]
-
-		var cidr string
-		switch {
-		case net.Labels != nil && net.Labels[consts.NetworkNotRemappedLabelKey] == consts.NetworkNotRemappedLabelValue:
-			cidr = net.Spec.CIDR.String()
-		default:
-			cidr = net.Status.CIDR.String()
-		}
-		if cidr == "" {
-			klog.Warningf("Network %s has no CIDR", net.Name)
-			continue
-		}
-
-		nets = append(nets, cidr)
-	}
-
-	return nets, nil
-}
-
-func (lipam *LiqoIPAM) getReservedIPs(ctx context.Context) ([]ipCidr, error) {
-	var ips []ipCidr
-	var ipList ipamv1alpha1.IPList
-	if err := lipam.Options.Client.List(ctx, &ipList); err != nil {
-		return nil, err
-	}
-
-	for i := range ipList.Items {
-		ip := &ipList.Items[i]
-
-		address := ip.Status.IP.String()
-		if address == "" {
-			klog.Warningf("IP %s has no address", ip.Name)
-			continue
-		}
-
-		cidr := ip.Status.CIDR.String()
-		if cidr == "" {
-			klog.Warningf("IP %s has no CIDR", ip.Name)
-			continue
-		}
-
-		ips = append(ips, ipCidr{ip: address, cidr: cidr})
-	}
-
-	return ips, nil
-}
-
-func (lipam *LiqoIPAM) reserveNetwork(cidr string) error {
-	// TODO: Reserve the network.
-	klog.Infof("Reserved network %s", cidr)
-	return nil
-}
-
-func (lipam *LiqoIPAM) reserveIP(ip, cidr string) error {
-	// TODO: Reserve the IP.
-	klog.Infof("Reserved IP %s in network %s", ip, cidr)
-	return nil
-}

pkg/ipam/ipam.go

@@ -16,51 +16,58 @@ package ipam
 
 import (
 	"context"
+	"sync"
 	"time"
 
 	"google.golang.org/grpc/health"
 	"google.golang.org/grpc/health/grpc_health_v1"
-	"k8s.io/client-go/rest"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
 // LiqoIPAM is the struct implementing the IPAM interface.
 type LiqoIPAM struct {
 	UnimplementedIPAMServer
+	HealthServer *health.Server
 
-	Options *Options
-}
-
-// Options contains the options to configure the IPAM.
-type Options struct {
-	Port   int
-	Config *rest.Config
-	Client client.Client
+	client.Client
 
-	EnableLeaderElection    bool
-	LeaderElectionNamespace string
-	LeaderElectionName      string
-	LeaseDuration           time.Duration
-	RenewDeadline           time.Duration
-	RetryPeriod             time.Duration
-	PodName                 string
+	opts          *ServerOptions
+	cacheNetworks map[string]networkInfo
+	cacheIPs      map[string]ipInfo
+	mutex         sync.Mutex
+}
 
-	HealthServer *health.Server
+// ServerOptions contains the options to configure the IPAM server.
+type ServerOptions struct {
+	Port          int
+	SyncFrequency time.Duration
 }
 
 // New creates a new instance of the LiqoIPAM.
-func New(ctx context.Context, opts *Options) (*LiqoIPAM, error) {
-	opts.HealthServer.SetServingStatus(IPAM_ServiceDesc.ServiceName, grpc_health_v1.HealthCheckResponse_NOT_SERVING)
+func New(ctx context.Context, cl client.Client, opts *ServerOptions) (*LiqoIPAM, error) {
+	hs := health.NewServer()
+	hs.SetServingStatus(IPAM_ServiceDesc.ServiceName, grpc_health_v1.HealthCheckResponse_NOT_SERVING)
 
 	lipam := &LiqoIPAM{
-		Options: opts,
+		HealthServer: hs,
+
+		Client: cl,
+
+		opts:          opts,
+		cacheNetworks: make(map[string]networkInfo),
+		cacheIPs:      make(map[string]ipInfo),
 	}
 
+	// Initialize the IPAM instance
 	if err := lipam.initialize(ctx); err != nil {
 		return nil, err
 	}
 
-	opts.HealthServer.SetServingStatus(IPAM_ServiceDesc.ServiceName, grpc_health_v1.HealthCheckResponse_SERVING)
+	// Launch sync routine
+	go lipam.sync(ctx, opts.SyncFrequency)
+
+	hs.SetServingStatus(IPAM_ServiceDesc.ServiceName, grpc_health_v1.HealthCheckResponse_SERVING)
+
 	return lipam, nil
 }