/
main.go
255 lines (249 loc) · 8.19 KB
/
main.go
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package main
import (
"context"
"errors"
"flag"
"os"
"strings"
"sync"
"time"
"github.com/kyverno/kyverno/cmd/internal"
"github.com/kyverno/kyverno/pkg/background"
"github.com/kyverno/kyverno/pkg/client/clientset/versioned"
kyvernoinformer "github.com/kyverno/kyverno/pkg/client/informers/externalversions"
"github.com/kyverno/kyverno/pkg/clients/dclient"
"github.com/kyverno/kyverno/pkg/config"
globalcontextcontroller "github.com/kyverno/kyverno/pkg/controllers/globalcontext"
policymetricscontroller "github.com/kyverno/kyverno/pkg/controllers/metrics/policy"
engineapi "github.com/kyverno/kyverno/pkg/engine/api"
"github.com/kyverno/kyverno/pkg/engine/apicall"
"github.com/kyverno/kyverno/pkg/engine/jmespath"
"github.com/kyverno/kyverno/pkg/event"
"github.com/kyverno/kyverno/pkg/globalcontext/store"
"github.com/kyverno/kyverno/pkg/leaderelection"
"github.com/kyverno/kyverno/pkg/logging"
"github.com/kyverno/kyverno/pkg/metrics"
"github.com/kyverno/kyverno/pkg/policy"
kubeutils "github.com/kyverno/kyverno/pkg/utils/kube"
apiserver "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
kubeinformers "k8s.io/client-go/informers"
kyamlopenapi "sigs.k8s.io/kustomize/kyaml/openapi"
)
const (
resyncPeriod = 15 * time.Minute
)
func sanityChecks(apiserverClient apiserver.Interface) error {
return kubeutils.CRDsInstalled(apiserverClient, "updaterequests.kyverno.io")
}
func createrLeaderControllers(
eng engineapi.Engine,
genWorkers int,
kubeInformer kubeinformers.SharedInformerFactory,
kyvernoInformer kyvernoinformer.SharedInformerFactory,
kyvernoClient versioned.Interface,
dynamicClient dclient.Interface,
configuration config.Configuration,
metricsConfig metrics.MetricsConfigManager,
eventGenerator event.Interface,
jp jmespath.Interface,
backgroundScanInterval time.Duration,
) ([]internal.Controller, error) {
policyCtrl, err := policy.NewPolicyController(
kyvernoClient,
dynamicClient,
eng,
kyvernoInformer.Kyverno().V1().ClusterPolicies(),
kyvernoInformer.Kyverno().V1().Policies(),
kyvernoInformer.Kyverno().V1beta1().UpdateRequests(),
configuration,
eventGenerator,
kubeInformer.Core().V1().Namespaces(),
logging.WithName("PolicyController"),
backgroundScanInterval,
metricsConfig,
jp,
)
if err != nil {
return nil, err
}
backgroundController := background.NewController(
kyvernoClient,
dynamicClient,
eng,
kyvernoInformer.Kyverno().V1().ClusterPolicies(),
kyvernoInformer.Kyverno().V1().Policies(),
kyvernoInformer.Kyverno().V1beta1().UpdateRequests(),
kubeInformer.Core().V1().Namespaces(),
eventGenerator,
configuration,
jp,
)
return []internal.Controller{
internal.NewController("policy-controller", policyCtrl, 2),
internal.NewController("background-controller", backgroundController, genWorkers),
}, err
}
func main() {
var (
genWorkers int
maxQueuedEvents int
omitEvents string
maxAPICallResponseLength int64
)
flagset := flag.NewFlagSet("updaterequest-controller", flag.ExitOnError)
flagset.IntVar(&genWorkers, "genWorkers", 10, "Workers for the background controller.")
flagset.IntVar(&maxQueuedEvents, "maxQueuedEvents", 1000, "Maximum events to be queued.")
flagset.StringVar(&omitEvents, "omitEvents", "", "Set this flag to a comma sperated list of PolicyViolation, PolicyApplied, PolicyError, PolicySkipped to disable events, e.g. --omitEvents=PolicyApplied,PolicyViolation")
flagset.Int64Var(&maxAPICallResponseLength, "maxAPICallResponseLength", 2*1000*1000, "Maximum allowed response size from API Calls. A value of 0 bypasses checks (not recommended).")
// config
appConfig := internal.NewConfiguration(
internal.WithProfiling(),
internal.WithMetrics(),
internal.WithTracing(),
internal.WithKubeconfig(),
internal.WithPolicyExceptions(),
internal.WithConfigMapCaching(),
internal.WithDeferredLoading(),
internal.WithRegistryClient(),
internal.WithLeaderElection(),
internal.WithKyvernoClient(),
internal.WithDynamicClient(),
internal.WithKyvernoDynamicClient(),
internal.WithEventsClient(),
internal.WithApiServerClient(),
internal.WithFlagSets(flagset),
)
// parse flags
internal.ParseFlags(appConfig)
// setup
signalCtx, setup, sdown := internal.Setup(appConfig, "kyverno-background-controller", false)
defer sdown()
var err error
bgscanInterval := time.Hour
val := os.Getenv("BACKGROUND_SCAN_INTERVAL")
if val != "" {
if bgscanInterval, err = time.ParseDuration(val); err != nil {
setup.Logger.Error(err, "failed to set the background scan interval")
os.Exit(1)
}
}
setup.Logger.V(2).Info("setting the background scan interval", "value", bgscanInterval.String())
// THIS IS AN UGLY FIX
// ELSE KYAML IS NOT THREAD SAFE
kyamlopenapi.Schema()
if err := sanityChecks(setup.ApiServerClient); err != nil {
setup.Logger.Error(err, "sanity checks failed")
os.Exit(1)
}
// informer factories
kyvernoInformer := kyvernoinformer.NewSharedInformerFactory(setup.KyvernoClient, resyncPeriod)
var wg sync.WaitGroup
eventGenerator := event.NewEventGenerator(
setup.EventsClient,
logging.WithName("EventGenerator"),
maxQueuedEvents,
strings.Split(omitEvents, ",")...,
)
eventController := internal.NewController(
event.ControllerName,
eventGenerator,
event.Workers,
)
gcstore := store.New()
gceController := internal.NewController(
globalcontextcontroller.ControllerName,
globalcontextcontroller.NewController(
kyvernoInformer.Kyverno().V2alpha1().GlobalContextEntries(),
setup.KyvernoDynamicClient,
setup.KyvernoClient,
gcstore,
eventGenerator,
maxAPICallResponseLength,
false,
),
globalcontextcontroller.Workers,
) // this controller only subscribe to events, nothing is returned...
policymetricscontroller.NewController(
setup.MetricsManager,
kyvernoInformer.Kyverno().V1().ClusterPolicies(),
kyvernoInformer.Kyverno().V1().Policies(),
&wg,
)
engine := internal.NewEngine(
signalCtx,
setup.Logger,
setup.Configuration,
setup.MetricsConfiguration,
setup.Jp,
setup.KyvernoDynamicClient,
setup.RegistryClient,
setup.ImageVerifyCacheClient,
setup.KubeClient,
setup.KyvernoClient,
setup.RegistrySecretLister,
apicall.NewAPICallConfiguration(maxAPICallResponseLength),
gcstore,
)
// start informers and wait for cache sync
if !internal.StartInformersAndWaitForCacheSync(signalCtx, setup.Logger, kyvernoInformer) {
setup.Logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
os.Exit(1)
}
// setup leader election
le, err := leaderelection.New(
setup.Logger.WithName("leader-election"),
"kyverno-background-controller",
config.KyvernoNamespace(),
setup.LeaderElectionClient,
config.KyvernoPodName(),
internal.LeaderElectionRetryPeriod(),
func(ctx context.Context) {
logger := setup.Logger.WithName("leader")
// create leader factories
kubeInformer := kubeinformers.NewSharedInformerFactory(setup.KubeClient, resyncPeriod)
kyvernoInformer := kyvernoinformer.NewSharedInformerFactory(setup.KyvernoClient, resyncPeriod)
// create leader controllers
leaderControllers, err := createrLeaderControllers(
engine,
genWorkers,
kubeInformer,
kyvernoInformer,
setup.KyvernoClient,
setup.KyvernoDynamicClient,
setup.Configuration,
setup.MetricsManager,
eventGenerator,
setup.Jp,
bgscanInterval,
)
if err != nil {
logger.Error(err, "failed to create leader controllers")
os.Exit(1)
}
// start informers and wait for cache sync
if !internal.StartInformersAndWaitForCacheSync(signalCtx, logger, kyvernoInformer, kubeInformer) {
logger.Error(errors.New("failed to wait for cache sync"), "failed to wait for cache sync")
os.Exit(1)
}
// start leader controllers
var wg sync.WaitGroup
for _, controller := range leaderControllers {
controller.Run(signalCtx, logger.WithName("controllers"), &wg)
}
// wait all controllers shut down
wg.Wait()
},
nil,
)
if err != nil {
setup.Logger.Error(err, "failed to initialize leader election")
os.Exit(1)
}
// start non leader controllers
eventController.Run(signalCtx, setup.Logger, &wg)
gceController.Run(signalCtx, setup.Logger, &wg)
// start leader election
le.Run(signalCtx)
// wait for everything to shut down and exit
wg.Wait()
}