/
cli.go
213 lines (173 loc) · 6.11 KB
/
cli.go
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package cli
import (
"fmt"
"strings"
"time"
"go.uber.org/zap"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
"k8s.io/client-go/tools/cache"
"github.com/kanopy-platform/hedgetrimmer/internal/admission"
logzap "github.com/kanopy-platform/hedgetrimmer/internal/log/zap"
pkgadmission "github.com/kanopy-platform/hedgetrimmer/pkg/admission"
pkghandlers "github.com/kanopy-platform/hedgetrimmer/pkg/admission/handlers"
"github.com/kanopy-platform/hedgetrimmer/pkg/limitrange"
"github.com/kanopy-platform/hedgetrimmer/pkg/mutators"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"sigs.k8s.io/controller-runtime/pkg/healthz"
klog "sigs.k8s.io/controller-runtime/pkg/log"
k8szap "sigs.k8s.io/controller-runtime/pkg/log/zap"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/manager/signals"
)
var scheme = runtime.NewScheme()
type RootCommand struct {
k8sFlags *genericclioptions.ConfigFlags
}
func NewRootCommand() *cobra.Command {
k8sFlags := genericclioptions.NewConfigFlags(true)
root := &RootCommand{k8sFlags}
cmd := &cobra.Command{
Use: "hedgetrimmer",
PersistentPreRunE: root.persistentPreRunE,
RunE: root.runE,
}
cmd.PersistentFlags().String("log-level", "info", "Configure log level")
cmd.PersistentFlags().Int("webhook-listen-port", 8443, "Admission webhook listen port")
cmd.PersistentFlags().Int("metrics-listen-port", 8081, "Metrics listen port")
cmd.PersistentFlags().String("webhook-certs-dir", "/etc/webhook/certs", "Admission webhook TLS certificate directory")
cmd.PersistentFlags().Bool("dry-run", false, "Controller dry-run changes only")
cmd.PersistentFlags().Float64("default-memory-limit-request-ratio", 1.1, "Default memory limit/request ratio")
cmd.PersistentFlags().StringSlice("resources", all_resources, "List of resources to enforce")
k8sFlags.AddFlags(cmd.PersistentFlags())
// no need to check err, this only checks if variadic args != 0
_ = viper.BindEnv("kubeconfig", "KUBECONFIG")
cmd.AddCommand(newVersionCommand())
return cmd
}
func (c *RootCommand) persistentPreRunE(cmd *cobra.Command, args []string) error {
// bind flags to viper
viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
viper.SetEnvPrefix("app")
viper.AutomaticEnv()
if err := viper.BindPFlags(cmd.Flags()); err != nil {
return err
}
// set log level
logLevel, err := logzap.ParseLevel(viper.GetString("log-level"))
if err != nil {
return err
}
klog.SetLogger(k8szap.New(
k8szap.Level(logLevel),
k8szap.RawZapOpts(
zap.Fields(zap.Bool("dry-run", viper.GetBool("dry-run"))),
)),
)
return nil
}
func (c *RootCommand) runE(cmd *cobra.Command, args []string) error {
dryRun := viper.GetBool("dry-run")
if dryRun {
klog.Log.Info("running in dry-run mode.")
}
cfg, err := c.k8sFlags.ToRESTConfig()
if err != nil {
return err
}
ctx := signals.SetupSignalHandler()
mgr, err := manager.New(cfg, manager.Options{
Scheme: scheme,
Host: "0.0.0.0",
Port: viper.GetInt("webhook-listen-port"),
CertDir: viper.GetString("webhook-certs-dir"),
MetricsBindAddress: fmt.Sprintf("0.0.0.0:%d", viper.GetInt("metrics-listen-port")),
HealthProbeBindAddress: ":8080",
LeaderElection: true,
LeaderElectionID: "hedgetrimmer",
DryRunClient: dryRun,
})
if err != nil {
klog.Log.Error(err, "unable to set up controller manager")
return err
}
if err := configureHealthChecks(mgr); err != nil {
return err
}
cs, err := kubernetes.NewForConfig(cfg)
if err != nil {
return err
}
informerFactory := informers.NewSharedInformerFactoryWithOptions(cs, 1*time.Minute)
lri := informerFactory.Core().V1().LimitRanges()
lri.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(new interface{}) {},
})
informerFactory.Start(wait.NeverStop)
informerFactory.WaitForCacheSync(wait.NeverStop)
limitRanger := limitrange.NewLimitRanger(lri.Lister())
ptm := mutators.NewPodTemplateSpec(
mutators.WithDefaultMemoryLimitRequestRatio(viper.GetFloat64("default-memory-limit-request-ratio")),
mutators.WithDryRun(viper.GetBool("dry-run")),
)
handlers, err := getHandlers(viper.GetStringSlice("resources"), ptm)
if err != nil {
return err
}
admissionRouter, err := admission.NewRouter(limitRanger,
admission.WithAdmissionHandlers(handlers...),
)
if err != nil {
return err
}
admissionRouter.SetupWithManager(mgr)
return mgr.Start(ctx)
}
func configureHealthChecks(mgr manager.Manager) error {
if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
return err
}
if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
return err
}
return nil
}
func getHandlers(resources []string, ptm pkgadmission.PodTemplateSpecMutator) ([]admission.AdmissionHandler, error) {
var handlers []admission.AdmissionHandler
var unexpected []string
dedupedResources := make(map[string]bool)
for _, resource := range resources {
dedupedResources[strings.TrimSpace(resource)] = true
}
for resource := range dedupedResources {
switch resource {
case cronjobs:
handlers = append(handlers, pkghandlers.NewCronjobHandler(ptm))
case daemonsets:
handlers = append(handlers, pkghandlers.NewDaemonSetHandler(ptm))
case deployments:
handlers = append(handlers, pkghandlers.NewDeploymentHandler(ptm))
case jobs:
handlers = append(handlers, pkghandlers.NewJobHandler(ptm))
case pods:
handlers = append(handlers, pkghandlers.NewPodHandler(ptm))
case replicasets:
handlers = append(handlers, pkghandlers.NewReplicaSetHandler(ptm))
case replicationcontrollers:
handlers = append(handlers, pkghandlers.NewReplicationControllerHandler(ptm))
case statefulsets:
handlers = append(handlers, pkghandlers.NewStatefulSetHandler(ptm))
default:
unexpected = append(unexpected, resource)
}
}
if len(unexpected) > 0 {
return []admission.AdmissionHandler{}, fmt.Errorf("unexpected resources: %v", unexpected)
}
return handlers, nil
}