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main.go
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main.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-present Datadog, Inc.
package main
import (
"flag"
"fmt"
"os"
"time"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"gopkg.in/DataDog/dd-trace-go.v1/profiler"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
_ "k8s.io/client-go/plugin/pkg/client/auth" // Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
"k8s.io/klog/v2"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/healthz"
ctrlzap "sigs.k8s.io/controller-runtime/pkg/log/zap"
datadoghqv1alpha1 "github.com/DataDog/watermarkpodautoscaler/api/v1alpha1"
"github.com/DataDog/watermarkpodautoscaler/controllers"
"github.com/DataDog/watermarkpodautoscaler/pkg/config"
"github.com/DataDog/watermarkpodautoscaler/pkg/version"
// +kubebuilder:scaffold:imports
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
host = "0.0.0.0"
metricsPort int32 = 8383
healthPort = 9440
)
func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(datadoghqv1alpha1.AddToScheme(scheme))
// +kubebuilder:scaffold:scheme
}
func main() {
var metricsAddr string
var enableLeaderElection bool
var printVersionArg bool
var logEncoder string
var logTimestampFormat string
var syncPeriodSeconds int
var leaderElectionResourceLock string
var ddProfilingEnabled bool
var workers int
flag.BoolVar(&printVersionArg, "version", false, "print version and exit")
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", true,
"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
flag.IntVar(&healthPort, "health-port", healthPort, "Port to use for the health probe")
flag.StringVar(&logEncoder, "logEncoder", "json", "log encoding ('json' or 'console')")
flag.StringVar(&logTimestampFormat, "log-timestamp-format", "millis", "log timestamp format ('millis', 'nanos', 'epoch', 'rfc3339' or 'rfc3339nano')")
flag.IntVar(&syncPeriodSeconds, "syncPeriodSeconds", 60*60, "The informers resync period in seconds") // default 1 hour
flag.StringVar(&leaderElectionResourceLock, "leader-election-resource", "configmaps", "determines which resource lock to use for leader election. option:[configmapsleases|endpointsleases|configmaps]")
flag.BoolVar(&ddProfilingEnabled, "ddProfilingEnabled", false, "Enable the datadog profiler")
flag.IntVar(&workers, "workers", 1, "Maximum number of concurrent Reconciles which can be run")
logLevel := zap.LevelFlag("loglevel", zapcore.InfoLevel, "Set log level")
flag.Parse()
exitCode := 0
defer func() { os.Exit(exitCode) }()
if err := customSetupLogging(*logLevel, logEncoder, logTimestampFormat); err != nil {
setupLog.Error(err, "unable to setup the logger")
exitCode = 1
return
}
if ddProfilingEnabled {
setupLog.Info("Starting datadog profiler")
if err := profiler.Start(
profiler.WithVersion(version.Version),
profiler.WithProfileTypes(profiler.CPUProfile, profiler.HeapProfile),
); err != nil {
setupLog.Error(err, "unable to start datadog profiler")
}
defer profiler.Stop()
}
if printVersionArg {
version.PrintVersionWriter(os.Stdout)
return
}
version.PrintVersionLogs(setupLog)
syncDuration := time.Duration(syncPeriodSeconds) * time.Second
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), config.ManagerOptionsWithNamespaces(setupLog, ctrl.Options{
Scheme: scheme,
MetricsBindAddress: fmt.Sprintf("%s:%d", host, metricsPort),
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "watermarkpodautoscaler-lock",
LeaderElectionResourceLock: leaderElectionResourceLock,
HealthProbeBindAddress: fmt.Sprintf("%s:%d", host, healthPort),
SyncPeriod: &syncDuration,
}))
if err != nil {
setupLog.Error(err, "unable to start manager")
exitCode = 1
return
}
managerLogger := ctrl.Log.WithName("controllers").WithName("WatermarkPodAutoscaler")
klog.SetLogger(managerLogger) // Redirect klog to the controller logger (zap)
if err = (&controllers.WatermarkPodAutoscalerReconciler{
Client: mgr.GetClient(),
Log: managerLogger,
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr, workers); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "WatermarkPodAutoscaler")
exitCode = 1
return
}
// +kubebuilder:scaffold:builder
if err := mgr.AddHealthzCheck("health-probe", healthz.Ping); err != nil {
setupLog.Error(err, "Unable add liveness check")
exitCode = 1
return
}
setupLog.Info("starting manager")
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
setupLog.Error(err, "problem running manager")
exitCode = 1
return
}
}
func customSetupLogging(logLevel zapcore.Level, logEncoder, logTimestampFormat string) error {
zapConfig := zap.NewProductionEncoderConfig()
if err := zapConfig.EncodeTime.UnmarshalText([]byte(logTimestampFormat)); err != nil {
return fmt.Errorf("unable to configure the log timestamp format, err: %w", err)
}
var encoder zapcore.Encoder
switch logEncoder {
case "console":
encoder = zapcore.NewConsoleEncoder(zapConfig)
case "json":
encoder = zapcore.NewJSONEncoder(zapConfig)
default:
return fmt.Errorf("unknow log encoder: %s", logEncoder)
}
ctrl.SetLogger(ctrlzap.New(
ctrlzap.Encoder(encoder),
ctrlzap.Level(logLevel),
ctrlzap.StacktraceLevel(zapcore.PanicLevel)),
)
return nil
}