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config.go
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config.go
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package speaker
import (
"context"
"errors"
"flag"
"fmt"
"os"
"time"
api "github.com/osrg/gobgp/api"
gobgp "github.com/osrg/gobgp/pkg/server"
"github.com/spf13/pflag"
"google.golang.org/grpc"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/klog/v2"
clientset "github.com/kubeovn/kube-ovn/pkg/client/clientset/versioned"
)
const (
DefaultBGPGrpcPort = 50051
DefaultBGPClusterAs = 65000
DefaultBGPNeighborAs = 65001
DefaultBGPHoldtime = 90 * time.Second
DefaultPprofPort = 10667
DefaultGracefulRestartDeferralTime = 360 * time.Second
DefaultGracefulRestartTime = 90 * time.Second
)
type Configuration struct {
GrpcHost string
GrpcPort uint32
ClusterAs uint32
RouterId string
NeighborAddress string
NeighborAs uint32
AuthPassword string
HoldTime float64
BgpServer *gobgp.BgpServer
AnnounceClusterIP bool
GracefulRestart bool
GracefulRestartDeferralTime time.Duration
GracefulRestartTime time.Duration
KubeConfigFile string
KubeClient kubernetes.Interface
KubeOvnClient clientset.Interface
PprofPort uint32
}
func ParseFlags() (*Configuration, error) {
var (
argDefaultGracefulTime = pflag.Duration("graceful-restart-time", DefaultGracefulRestartTime, "BGP Graceful restart time according to RFC4724 3, maximum 4095s.")
argGracefulRestartDeferralTime = pflag.Duration("graceful-restart-deferral-time", DefaultGracefulRestartDeferralTime, "BGP Graceful restart deferral time according to RFC4724 4.1, maximum 18h.")
argGracefulRestart = pflag.BoolP("graceful-restart", "", false, "Enables the BGP Graceful Restart so that routes are preserved on unexpected restarts")
argAnnounceClusterIP = pflag.BoolP("announce-cluster-ip", "", false, "The Cluster IP of the service to announce to the BGP peers.")
argGrpcHost = pflag.String("grpc-host", "127.0.0.1", "The host address for grpc to listen, default: 127.0.0.1")
argGrpcPort = pflag.Uint32("grpc-port", DefaultBGPGrpcPort, "The port for grpc to listen, default:50051")
argClusterAs = pflag.Uint32("cluster-as", DefaultBGPClusterAs, "The as number of container network, default 65000")
argRouterId = pflag.String("router-id", "", "The address for the speaker to use as router id, default the node ip")
argNeighborAddress = pflag.String("neighbor-address", "", "The router address the speaker connects to.")
argNeighborAs = pflag.Uint32("neighbor-as", DefaultBGPNeighborAs, "The router as number, default 65001")
argAuthPassword = pflag.String("auth-password", "", "bgp peer auth password")
argHoldTime = pflag.Duration("holdtime", DefaultBGPHoldtime, "ovn-speaker goes down abnormally, the local saving time of BGP route will be affected.Holdtime must be in the range 3s to 65536s. (default 90s)")
argPprofPort = pflag.Uint32("pprof-port", DefaultPprofPort, "The port to get profiling data, default: 10667")
argKubeConfigFile = pflag.String("kubeconfig", "", "Path to kubeconfig file with authorization and master location information. If not set use the inCluster token.")
)
klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
klog.InitFlags(klogFlags)
// Sync the glog and klog flags.
pflag.CommandLine.VisitAll(func(f1 *pflag.Flag) {
f2 := klogFlags.Lookup(f1.Name)
if f2 != nil {
value := f1.Value.String()
if err := f2.Value.Set(value); err != nil {
klog.Fatalf("failed to set flag, %v", err)
}
}
})
pflag.CommandLine.AddGoFlagSet(klogFlags)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
ht := argHoldTime.Seconds()
if ht > 65536 || ht < 3 {
return nil, errors.New("the bgp holdtime must be in the range 3s to 65536s")
}
config := &Configuration{
AnnounceClusterIP: *argAnnounceClusterIP,
GrpcHost: *argGrpcHost,
GrpcPort: *argGrpcPort,
ClusterAs: *argClusterAs,
RouterId: *argRouterId,
NeighborAddress: *argNeighborAddress,
NeighborAs: *argNeighborAs,
AuthPassword: *argAuthPassword,
HoldTime: ht,
PprofPort: *argPprofPort,
KubeConfigFile: *argKubeConfigFile,
GracefulRestart: *argGracefulRestart,
GracefulRestartDeferralTime: *argGracefulRestartDeferralTime,
GracefulRestartTime: *argDefaultGracefulTime,
}
if config.RouterId == "" {
config.RouterId = os.Getenv("POD_IP")
if config.RouterId == "" {
return nil, errors.New("no router id or POD_IP")
}
}
if err := config.initKubeClient(); err != nil {
return nil, fmt.Errorf("failed to init kube client, %v", err)
}
if err := config.initBgpServer(); err != nil {
return nil, fmt.Errorf("failed to init bgp server, %v", err)
}
return config, nil
}
func (config *Configuration) initKubeClient() error {
var cfg *rest.Config
var err error
if config.KubeConfigFile == "" {
klog.Infof("no --kubeconfig, use in-cluster kubernetes config")
cfg, err = rest.InClusterConfig()
if err != nil {
klog.Errorf("use in cluster config failed %v", err)
return err
}
} else {
cfg, err = clientcmd.BuildConfigFromFlags("", config.KubeConfigFile)
if err != nil {
klog.Errorf("use --kubeconfig %s failed %v", config.KubeConfigFile, err)
return err
}
}
cfg.QPS = 1000
cfg.Burst = 2000
kubeOvnClient, err := clientset.NewForConfig(cfg)
if err != nil {
klog.Errorf("init kubeovn client failed %v", err)
return err
}
config.KubeOvnClient = kubeOvnClient
cfg.ContentType = "application/vnd.kubernetes.protobuf"
cfg.AcceptContentTypes = "application/vnd.kubernetes.protobuf,application/json"
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
klog.Errorf("init kubernetes client failed %v", err)
return err
}
config.KubeClient = kubeClient
return nil
}
func (config *Configuration) checkGracefulRestartOptions() error {
if config.GracefulRestartTime > time.Second*4095 || config.GracefulRestartTime <= 0 {
return errors.New("GracefuleRestartTime should be less than 4095 seconds or more than 0")
}
if config.GracefulRestartDeferralTime > time.Hour*18 || config.GracefulRestartDeferralTime <= 0 {
return errors.New("GracefuleRestartDeferralTime should be less than 18 hours or more than 0")
}
return nil
}
func (config *Configuration) initBgpServer() error {
maxSize := 256 << 20
grpcOpts := []grpc.ServerOption{grpc.MaxRecvMsgSize(maxSize), grpc.MaxSendMsgSize(maxSize)}
s := gobgp.NewBgpServer(
gobgp.GrpcListenAddress(fmt.Sprintf("%s:%d", config.GrpcHost, config.GrpcPort)),
gobgp.GrpcOption(grpcOpts))
go s.Serve()
if err := s.StartBgp(context.Background(), &api.StartBgpRequest{
Global: &api.Global{
As: config.ClusterAs,
RouterId: config.RouterId,
ListenPort: -1,
UseMultiplePaths: true,
},
}); err != nil {
return err
}
peer := &api.Peer{
Timers: &api.Timers{Config: &api.TimersConfig{HoldTime: uint64(config.HoldTime)}},
Conf: &api.PeerConf{
NeighborAddress: config.NeighborAddress,
PeerAs: config.NeighborAs,
},
}
if config.AuthPassword != "" {
peer.Conf.AuthPassword = config.AuthPassword
}
if config.GracefulRestart {
if err := config.checkGracefulRestartOptions(); err != nil {
return err
}
peer.GracefulRestart = &api.GracefulRestart{
Enabled: true,
RestartTime: uint32(config.GracefulRestartTime.Seconds()),
DeferralTime: uint32(config.GracefulRestartDeferralTime.Seconds()),
LocalRestarting: true,
}
peer.AfiSafis = []*api.AfiSafi{
{
Config: &api.AfiSafiConfig{
Family: &api.Family{Afi: api.Family_AFI_IP, Safi: api.Family_SAFI_UNICAST},
Enabled: true,
},
MpGracefulRestart: &api.MpGracefulRestart{
Config: &api.MpGracefulRestartConfig{
Enabled: true,
},
},
},
}
}
if err := s.AddPeer(context.Background(), &api.AddPeerRequest{
Peer: peer,
}); err != nil {
return err
}
config.BgpServer = s
return nil
}