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app.go
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app.go
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/*
* Copyright 2019 gosoon.
*
* 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 operator
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
"time"
clientset "github.com/gosoon/kubernetes-operator/pkg/client/clientset/versioned"
informers "github.com/gosoon/kubernetes-operator/pkg/client/informers/externalversions"
ecsv1controller "github.com/gosoon/kubernetes-operator/pkg/controller"
"github.com/gosoon/kubernetes-operator/pkg/kuberesource"
"github.com/gosoon/kubernetes-operator/pkg/server"
ctrl "github.com/gosoon/kubernetes-operator/pkg/server/controller"
"github.com/gosoon/kubernetes-operator/pkg/utils/signals"
"github.com/gosoon/glog"
homedir "github.com/mitchellh/go-homedir"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/leaderelection"
)
var (
cfgFile string
masterURL string
kubeconfig string
)
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "kubernetes-operator",
Short: "A brief description of your application",
Long: `A longer description that spans multiple lines and likely contains
examples and usage of using your application. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
// Uncomment the following line if your bare application
// has an action associated with it:
// Run: func(cmd *cobra.Command, args []string) { },
Run: func(cmd *cobra.Command, args []string) {
// set up signals so we handle the first shutdown signal gracefully
stopCh := signals.SetupSignalHandler()
var cfg *rest.Config
var err error
if kubeconfig == "" {
cfg, err = rest.InClusterConfig()
} else {
cfg, err = clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)
}
if err != nil {
glog.Fatalf("Error building kubeconfig: %s", err.Error())
}
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
glog.Fatalf("Error building kubernetes clientset: %s", err.Error())
}
kubernetesClusterClient, err := clientset.NewForConfig(cfg)
if err != nil {
glog.Fatalf("Error building kubernetesCluster clientset: %s", err.Error())
}
// start http server
go func() {
opt := &ctrl.Options{KubernetesClusterClientset: kubernetesClusterClient, KubeClientset: kubeClient}
server := server.New(server.Options{CtrlOptions: opt, ListenAddr: ":8080"})
if err := server.ListenAndServe(); err != nil {
glog.Fatalf("Failed to listen and serve admission webhook server: %v", err)
}
glog.Info("Server started")
}()
// new resourcelock
rl, err := kuberesource.NewResourceLock(kubeClient)
if err != nil {
glog.Fatalf("new resourcelock failed with:%s", err.Error())
}
// add leader elector
run := func(ctx context.Context) {
kubernetesClusterInformerFactory := informers.NewSharedInformerFactory(kubernetesClusterClient,
ecsv1controller.NoResyncPeriodFunc())
ecsv1Controller := ecsv1controller.NewController(kubeClient, kubernetesClusterClient,
kubernetesClusterInformerFactory.Ecs().V1().KubernetesClusters())
go kubernetesClusterInformerFactory.Start(stopCh)
go func() {
if err = ecsv1Controller.Run(2, stopCh); err != nil {
glog.Fatalf("Error running controller: %s", err.Error())
}
}()
// listening OS shutdown singal
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)
<-signalChan
glog.Infof("Got OS shutdown signal, shutting down webhook server gracefully...")
//server.Shutdown(context.Background())
}
leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
Lock: rl,
LeaseDuration: 15 * time.Second,
RenewDeadline: 10 * time.Second,
RetryPeriod: 2 * time.Second,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: run,
OnStoppedLeading: func() {
glog.Info("leaderelection lost")
},
},
Name: ecsv1controller.ComponentName,
})
},
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func init() {
cobra.OnInitialize(initConfig)
// Here you will define your flags and configuration settings.
// Cobra supports persistent flags, which, if defined here,
// will be global for your application.
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.kubernetes-operator.yaml)")
rootCmd.PersistentFlags().StringVarP(&kubeconfig, "kubeconfig", "c", "", "Path to a kubeconfig. Only required if out-of-cluster.")
rootCmd.PersistentFlags().StringVar(&masterURL, "master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
// Cobra also supports local flags, which will only run
// when this action is called directly.
rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Search config in home directory with name ".kubernetes-operator" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".kubernetes-operator")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
}