/
options.go
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/
options.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package app
import (
"errors"
"flag"
"github.com/gardener/gardener/pkg/logger"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/runtime"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
"sigs.k8s.io/controller-runtime/pkg/manager/signals"
"github.com/gardener/logging/pkg/events"
)
// NewCommandStartGardenerEventLogger creates a *cobra.Command object with default parameters.
func NewCommandStartGardenerEventLogger() *cobra.Command {
opts := NewOptions()
cmd := &cobra.Command{
Use: "gardener-event-logger",
Short: "Launch the Gardener Event Logger",
Long: "Launch the Gardener Event Logger",
RunE: func(c *cobra.Command, args []string) error {
verflag.PrintAndExitIfRequested()
if err := opts.Validate(); err != nil {
return err
}
stopCh := signals.SetupSignalHandler()
return opts.Run(stopCh.Done())
},
SilenceUsage: true,
}
flags := cmd.Flags()
verflag.AddFlags(flags)
opts.AddFlags(flags)
// has to be after opts.AddFlags because controller-runtime registers "--kubeconfig" on flag.CommandLine
// see https://github.com/kubernetes-sigs/controller-runtime/blob/v0.8.0/pkg/client/config/config.go#L38
flags.AddGoFlagSet(flag.CommandLine)
return cmd
}
// Options has all the context and parameters needed to run a Gardener Events logger.
type Options struct {
SeedEventWatcher events.SeedOptions
ShootEventWatcher events.ShootOptions
//Logs *logs.KlogWriter
}
// NewOptions returns a new Options object.
func NewOptions() *Options {
o := &Options{
SeedEventWatcher: events.SeedOptions{},
ShootEventWatcher: events.ShootOptions{},
//Logs: logs.KlogWriter,
}
return o
}
// AddFlags adds all flags to the given FlagSet.
func (o *Options) AddFlags(flags *pflag.FlagSet) {
o.SeedEventWatcher.AddFlags(flags)
o.ShootEventWatcher.AddFlags(flags)
//o.Logs.AddFlags(flags)
}
// Validate validates all the required options.
func (o *Options) Validate() error {
var errs []error
errs = append(errs, o.SeedEventWatcher.Validate()...)
errs = append(errs, o.ShootEventWatcher.Validate()...)
// Activate logging as soon as possible
// if err := o.Logs.ValidateAndApply(); err != nil {
// return err
// }
return utilerrors.NewAggregate(errs)
}
func (o *Options) config(seedKubeAPIServerConfig *rest.Config, seedKubeClient *kubernetes.Clientset, shootKubeAPIServerConfig *rest.Config, shootKubeClient *kubernetes.Clientset) (*events.GardenerEventWatcherConfig, error) {
config := &events.GardenerEventWatcherConfig{}
for _, namespace := range o.SeedEventWatcher.Namespaces {
config.SeedKubeInformerFactories = append(config.SeedKubeInformerFactories,
kubeinformers.NewFilteredSharedInformerFactory(seedKubeClient, shootKubeAPIServerConfig.Timeout, namespace, nil),
)
}
for _, namespace := range o.ShootEventWatcher.Namespaces {
config.ShootKubeInformerFactories = append(config.ShootKubeInformerFactories,
kubeinformers.NewFilteredSharedInformerFactory(shootKubeClient, shootKubeAPIServerConfig.Timeout, namespace, nil),
)
}
if err := o.ApplyTo(config); err != nil {
return nil, err
}
return config, nil
}
// Run runs gardener-apiserver with the given Options.
func (o *Options) Run(stopCh <-chan struct{}) error {
logger, err := logger.NewZapLogger(logger.InfoLevel, logger.FormatJSON)
if err != nil {
return err
}
logger.Info("Starting Gardener Event Logger...", "Version", version.Get())
// Create clientset for the native Kubernetes API group
// Use remote kubeconfig file (if set) or in-cluster config to create a new Kubernetes client for the native Kubernetes API groups
seedKubeAPIServerConfig, err := clientcmd.BuildConfigFromFlags("", o.SeedEventWatcher.Kubeconfig)
if err != nil {
return err
}
protobufConfig := *seedKubeAPIServerConfig
if protobufConfig.ContentType == "" {
protobufConfig.ContentType = runtime.ContentTypeProtobuf
}
// seed kube client
seedKubeClient, err := kubernetes.NewForConfig(&protobufConfig)
if err != nil {
return err
}
var shootKubeClient *kubernetes.Clientset
var shootKubeAPIServerConfig *rest.Config
if o.ShootEventWatcher.Kubeconfig != "" {
if o.ShootEventWatcher.Kubeconfig == "inClusterConfig" {
return errors.New("inClusterConfig cannot be used for shoot kube client")
}
shootKubeAPIServerConfig, err = clientcmd.BuildConfigFromFlags("", o.ShootEventWatcher.Kubeconfig)
if err != nil {
return err
}
protobufConfig := *shootKubeAPIServerConfig
if protobufConfig.ContentType == "" {
protobufConfig.ContentType = runtime.ContentTypeProtobuf
}
// shoot kube client
shootKubeClient, err = kubernetes.NewForConfig(&protobufConfig)
if err != nil {
return err
}
}
config, err := o.config(seedKubeAPIServerConfig, seedKubeClient, shootKubeAPIServerConfig, shootKubeClient)
if err != nil {
return err
}
eventLogger := config.New()
if err != nil {
return err
}
eventLogger.Run(stopCh)
return nil
}
// ApplyTo applies the options to the given config.
func (o *Options) ApplyTo(config *events.GardenerEventWatcherConfig) error {
if err := o.SeedEventWatcher.ApplyTo(&config.SeedEventWatcherConfig); err != nil {
return err
}
if err := o.ShootEventWatcher.ApplyTo(&config.ShootEventWatcherConfig); err != nil {
return err
}
return nil
}