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fsm-ingress.go
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fsm-ingress.go
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// Package main contains the main function for the fsm-ingress binary
package main
import (
"context"
"flag"
"fmt"
"os"
"os/exec"
"github.com/kelseyhightower/envconfig"
"github.com/pkg/errors"
"github.com/spf13/pflag"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
ctrl "sigs.k8s.io/controller-runtime"
"github.com/flomesh-io/fsm/pkg/configurator"
"github.com/flomesh-io/fsm/pkg/constants"
"github.com/flomesh-io/fsm/pkg/errcode"
configClientset "github.com/flomesh-io/fsm/pkg/gen/client/config/clientset/versioned"
"github.com/flomesh-io/fsm/pkg/httpserver"
"github.com/flomesh-io/fsm/pkg/k8s/informers"
"github.com/flomesh-io/fsm/pkg/logger"
"github.com/flomesh-io/fsm/pkg/messaging"
"github.com/flomesh-io/fsm/pkg/metricsstore"
"github.com/flomesh-io/fsm/pkg/signals"
"github.com/flomesh-io/fsm/pkg/utils"
"github.com/flomesh-io/fsm/pkg/version"
)
type metadata struct {
PodName string `envconfig:"POD_NAME" required:"true" split_words:"true"`
PodNamespace string `envconfig:"POD_NAMESPACE" required:"true" split_words:"true"`
}
var (
flags = pflag.NewFlagSet(`fsm-ingress`, pflag.ExitOnError)
log = logger.New("fsm-ingress/main")
)
var (
verbosity string
meshName string // An ID that uniquely identifies an FSM instance
fsmNamespace string
fsmMeshConfigName string
fsmVersion string
meta metadata
)
const (
httpSchema = "http"
)
func init() {
flags.StringVarP(&verbosity, "verbosity", "v", constants.DefaultFSMLogLevel, "Set boot log verbosity level")
flags.StringVar(&meshName, "mesh-name", "", "FSM mesh name")
flags.StringVar(&fsmNamespace, "fsm-namespace", "", "FSM controller's namespace")
flags.StringVar(&fsmMeshConfigName, "fsm-config-name", "fsm-mesh-config", "Name of the FSM MeshConfig")
flags.StringVar(&fsmVersion, "fsm-version", "", "Version of FSM")
meta = getMetadata()
}
func getMetadata() metadata {
var metadata metadata
err := envconfig.Process("FSM", &metadata)
if err != nil {
log.Error().Msgf("unable to load FSM metadata from environment: %s", err)
panic(err)
}
return metadata
}
func main() {
log.Info().Msgf("Starting fsm-ingress %s; %s; %s", version.Version, version.GitCommit, version.BuildDate)
if err := parseFlags(); err != nil {
log.Fatal().Err(err).Str(errcode.Kind, errcode.ErrInvalidCLIArgument.String()).Msg("Error parsing cmd line arguments")
}
if err := logger.SetLogLevel(verbosity); err != nil {
log.Fatal().Err(err).Msg("Error setting log level")
}
kubeconfig := ctrl.GetConfigOrDie()
kubeClient := kubernetes.NewForConfigOrDie(kubeconfig)
configClient := configClientset.NewForConfigOrDie(kubeconfig)
if !version.IsSupportedK8sVersionForGatewayAPI(kubeClient) {
log.Error().Msgf("kubernetes server version %s is not supported, requires at least %s",
version.ServerVersion.String(), version.MinK8sVersionForGatewayAPI.String())
os.Exit(1)
}
_, cancel := context.WithCancel(context.TODO())
stop := signals.RegisterExitHandlers(cancel)
msgBroker := messaging.NewBroker(stop)
informerCollection, err := informers.NewInformerCollection(meshName, stop,
//informers.WithKubeClient(kubeClient),
informers.WithConfigClient(configClient, fsmMeshConfigName, fsmNamespace),
)
if err != nil {
log.Error().Msgf("")
}
cfg := configurator.NewConfigurator(informerCollection, fsmNamespace, fsmMeshConfigName, msgBroker)
if !cfg.IsIngressEnabled() {
log.Error().Msgf("Ingress is not enabled, FSM doesn't support Ingress and GatewayAPI are both enabled.")
os.Exit(1)
}
// get ingress codebase
ingressRepoURL := ingressCodebase(cfg)
log.Info().Msgf("Ingress Repo = %q", ingressRepoURL)
// calculate pipy spawn
spawn := calcPipySpawn(kubeClient)
log.Info().Msgf("PIPY SPAWN = %d", spawn)
// start pipy
startPipy(spawn, ingressRepoURL)
startHTTPServer()
<-stop
cancel()
log.Info().Msgf("Stopping fsm-ingress %s; %s; %s", version.Version, version.GitCommit, version.BuildDate)
}
func parseFlags() error {
if err := flags.Parse(os.Args); err != nil {
return err
}
_ = flag.CommandLine.Parse([]string{})
return nil
}
func ingressCodebase(cfg configurator.Configurator) string {
repoHost := fmt.Sprintf("%s.%s.svc", constants.FSMControllerName, fsmNamespace)
repoPort := cfg.GetProxyServerPort()
if cfg.IsNamespacedIngressEnabled() {
return fmt.Sprintf("%s://%s:%d/repo%s/", httpSchema, repoHost, repoPort, utils.NamespacedIngressCodebasePath(meta.PodNamespace))
}
if cfg.IsIngressEnabled() {
return fmt.Sprintf("%s://%s:%d/repo%s/", httpSchema, repoHost, repoPort, utils.IngressCodebasePath())
}
return ""
}
func calcPipySpawn(kubeClient kubernetes.Interface) int64 {
cpuLimits, err := getIngressCPULimitsQuota(kubeClient)
if err != nil {
log.Fatal().Err(err)
os.Exit(1)
}
log.Info().Msgf("CPU Limits = %v", cpuLimits)
spawn := int64(1)
if cpuLimits.Value() > 0 {
spawn = cpuLimits.Value()
}
return spawn
}
func getIngressPod(kubeClient kubernetes.Interface) (*corev1.Pod, error) {
podNamespace := meta.PodNamespace
podName := meta.PodName
pod, err := kubeClient.CoreV1().Pods(podNamespace).Get(context.TODO(), podName, metav1.GetOptions{})
if err != nil {
log.Error().Msgf("Error retrieving ingress-pipy pod %s", podName)
return nil, err
}
return pod, nil
}
func getIngressCPULimitsQuota(kubeClient kubernetes.Interface) (*resource.Quantity, error) {
pod, err := getIngressPod(kubeClient)
if err != nil {
return nil, err
}
for _, c := range pod.Spec.Containers {
if c.Name == "ingress" {
return c.Resources.Limits.Cpu(), nil
}
}
return nil, errors.Errorf("No container named 'ingress' in POD %q", pod.Name)
}
func startPipy(spawn int64, ingressRepoURL string) {
args := []string{ingressRepoURL}
if spawn > 1 {
args = append([]string{"--reuse-port", fmt.Sprintf("--threads=%d", spawn)}, args...)
}
if verbosity != "disabled" {
args = append([]string{fmt.Sprintf("--log-level=%s", utils.PipyLogLevelByVerbosity(verbosity))}, args...)
}
cmd := exec.Command("pipy", args...) // #nosec G204
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
log.Info().Msgf("cmd = %v", cmd)
if err := cmd.Start(); err != nil {
log.Fatal().Err(err)
os.Exit(1)
}
}
func startHTTPServer() {
// Initialize FSM's http service server
httpServer := httpserver.NewHTTPServer(constants.FSMHTTPServerPort)
// Metrics
httpServer.AddHandler(constants.MetricsPath, metricsstore.DefaultMetricsStore.Handler())
// Version
httpServer.AddHandler(constants.VersionPath, version.GetVersionHandler())
// Start HTTP server
err := httpServer.Start()
if err != nil {
log.Fatal().Err(err).Msgf("Failed to start FSM Ingress metrics/probes HTTP server")
os.Exit(1)
}
}