forked from sensu/sensu-operator
/
main.go
246 lines (216 loc) · 7.67 KB
/
main.go
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// Copyright 2016 The etcd-operator Authors
//
// 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 main
import (
"context"
"fmt"
"net/http"
"os"
"runtime"
"strings"
"time"
"github.com/objectrocket/sensu-operator/pkg/client"
"github.com/objectrocket/sensu-operator/pkg/controller"
"github.com/objectrocket/sensu-operator/pkg/util/constants"
"github.com/objectrocket/sensu-operator/pkg/util/k8sutil"
"github.com/objectrocket/sensu-operator/pkg/util/probe"
"github.com/objectrocket/sensu-operator/pkg/util/retryutil"
"github.com/objectrocket/sensu-operator/version"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
)
var (
namespace string
name string
listenAddr string
gcInterval time.Duration
resyncInterval time.Duration
logLevel string
logrusLevel logrus.Level
printVersion bool
createCRD bool
clusterWide bool
workerThreads int
processingRetries int
rootCmd = &cobra.Command{
Use: "sensu-operator",
Short: "Kubernetes operator for Sensu",
Long: "Kubernetes operator for Sensu",
Run: func(cmd *cobra.Command, args []string) {
mainLoop()
},
}
)
func init() {
viper.SetEnvPrefix("SENSUOP")
// viper.AutomaticEnv()
viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
// Flags that should be handled by default env-vars
envFlags := [...]string{
"listen-addr",
"log-level",
"create-crd",
"cluster-wide",
"gc-interval",
"resync-interval",
"worker-threads",
"processing-retries",
}
rootCmd.PersistentFlags().String("listen-addr", "0.0.0.0:8080", "The address on which the HTTP server will listen to")
rootCmd.PersistentFlags().String("log-level", "info", "The logging level (debug/info/warn/error/none")
rootCmd.PersistentFlags().BoolVarP(&printVersion, "version", "", false, "Show version and quit")
rootCmd.PersistentFlags().Bool("create-crd", true, "The operator will not create the SensuCluster CRD when this flag is set to false.")
rootCmd.PersistentFlags().Bool("cluster-wide", false, "Enable operator to watch clusters in all namespaces")
rootCmd.PersistentFlags().Duration("gc-interval", 10*time.Minute, "GC interval")
rootCmd.PersistentFlags().Duration("resync-interval", 5*time.Minute, "How often to refresh/resync all Custom Resources")
rootCmd.PersistentFlags().Int("worker-threads", 4, "Number of worker threads to use for processing events")
rootCmd.PersistentFlags().Int("processing-retries", 5, "Number of times to retry processing an event before giving up")
for _, flag := range envFlags {
viper.BindEnv(flag)
viper.BindPFlag(flag, rootCmd.PersistentFlags().Lookup(flag))
}
listenAddr = viper.GetString("listen-addr")
logLevel = viper.GetString("log-level")
createCRD = viper.GetBool("create-crd")
clusterWide = viper.GetBool("cluster-wide")
gcInterval = viper.GetDuration("gc-interval")
resyncInterval = viper.GetDuration("resync-interval")
workerThreads = viper.GetInt("worker-threads")
processingRetries = viper.GetInt("processing-retries")
if level, err := logrus.ParseLevel(logLevel); err != nil {
logrus.Fatalf("invalid log-level %s", logLevel)
} else {
logrusLevel = level
logrus.SetLevel(level)
}
}
func main() {
rootCmd.Execute()
}
func mainLoop() {
if printVersion {
fmt.Println("sensu-operator Version:", version.Version)
fmt.Println("Git SHA:", version.GitSHA)
fmt.Println("Go Version:", runtime.Version())
fmt.Printf("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)
os.Exit(0)
}
namespace = os.Getenv(constants.EnvOperatorPodNamespace)
if len(namespace) == 0 {
logrus.Fatalf("must set env (%s)", constants.EnvOperatorPodNamespace)
}
name = os.Getenv(constants.EnvOperatorPodName)
if len(name) == 0 {
logrus.Fatalf("must set env (%s)", constants.EnvOperatorPodName)
}
logrus.Infof("sensu-operator Version: %v", version.Version)
logrus.Infof("Git SHA: %s", version.GitSHA)
logrus.Infof("Go Version: %s", runtime.Version())
logrus.Infof("Go OS/Arch: %s/%s", runtime.GOOS, runtime.GOARCH)
logrus.Infof("Listen Address: %s", listenAddr)
logrus.Infof("Watching Cluster Wide: Value: %t", clusterWide)
logrus.Infof("Creating CRDs if they don't exist: %t", createCRD)
id, err := os.Hostname()
if err != nil {
logrus.Fatalf("failed to get hostname: %v", err)
}
kubecli := k8sutil.MustNewKubeClient()
http.HandleFunc(probe.HTTPReadyzEndpoint, probe.ReadyzHandler)
http.Handle("/metrics", prometheus.Handler())
go http.ListenAndServe(listenAddr, nil)
rl, err := resourcelock.New(resourcelock.EndpointsResourceLock,
namespace,
"sensu-operator",
kubecli.CoreV1(),
resourcelock.ResourceLockConfig{
Identity: id,
EventRecorder: createRecorder(kubecli, name, namespace),
})
if err != nil {
logrus.Fatalf("error creating lock: %v", err)
}
leaderelection.RunOrDie(context.Background(), leaderelection.LeaderElectionConfig{
Lock: rl,
LeaseDuration: 15 * time.Second,
RenewDeadline: 10 * time.Second,
RetryPeriod: 2 * time.Second,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: run,
OnStoppedLeading: func() {
logrus.Fatalf("leader election lost")
},
},
})
panic("unreachable")
}
func run(ctx context.Context) {
cfg := newControllerConfig()
c := controller.New(cfg)
ctx, cancelFunc := context.WithCancel(context.Background())
go c.Start(ctx)
select {
case <-ctx.Done():
cancelFunc()
}
}
func newControllerConfig() controller.Config {
kubecli := k8sutil.MustNewKubeClient()
serviceAccount, err := getMyPodServiceAccount(kubecli)
if err != nil {
logrus.Fatalf("fail to get my pod's service account: %v", err)
}
cfg := controller.Config{
Namespace: namespace,
ClusterWide: clusterWide,
ServiceAccount: serviceAccount,
KubeCli: kubecli,
KubeExtCli: k8sutil.MustNewKubeExtClient(),
SensuCRCli: client.MustNewInCluster(),
CreateCRD: createCRD,
WorkerThreads: workerThreads,
ProcessingRetries: processingRetries,
LogLevel: logrusLevel,
ResyncPeriod: resyncInterval,
}
return cfg
}
func getMyPodServiceAccount(kubecli kubernetes.Interface) (string, error) {
var sa string
err := retryutil.Retry(5*time.Second, 100, func() (bool, error) {
pod, err := kubecli.CoreV1().Pods(namespace).Get(name, metav1.GetOptions{})
if err != nil {
logrus.Errorf("fail to get operator pod (%s): %v", name, err)
return false, nil
}
sa = pod.Spec.ServiceAccountName
return true, nil
})
return sa, err
}
func createRecorder(kubecli kubernetes.Interface, name, namespace string) record.EventRecorder {
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(logrus.Infof)
eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: v1core.New(kubecli.Core().RESTClient()).Events(namespace)})
return eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: name})
}