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package main
import (
"context"
"flag"
"fmt"
"os"
"runtime"
// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
_ "k8s.io/client-go/plugin/pkg/client/auth"
"k8s.io/client-go/rest"
"collectd-operator/pkg/apis"
"collectd-operator/pkg/controller"
"github.com/operator-framework/operator-sdk/pkg/k8sutil"
kubemetrics "github.com/operator-framework/operator-sdk/pkg/kube-metrics"
"github.com/operator-framework/operator-sdk/pkg/leader"
"github.com/operator-framework/operator-sdk/pkg/log/zap"
"github.com/operator-framework/operator-sdk/pkg/metrics"
"github.com/operator-framework/operator-sdk/pkg/restmapper"
sdkVersion "github.com/operator-framework/operator-sdk/version"
"github.com/spf13/pflag"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"sigs.k8s.io/controller-runtime/pkg/client/config"
"sigs.k8s.io/controller-runtime/pkg/manager"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
"sigs.k8s.io/controller-runtime/pkg/runtime/signals"
)
// Change below variables to serve metrics on different host or port.
var (
metricsHost = "0.0.0.0"
metricsPort int32 = 8383
operatorMetricsPort int32 = 8686
)
var log = logf.Log.WithName("cmd")
func printVersion() {
log.Info(fmt.Sprintf("Go Version: %s", runtime.Version()))
log.Info(fmt.Sprintf("Go OS/Arch: %s/%s", runtime.GOOS, runtime.GOARCH))
log.Info(fmt.Sprintf("Version of operator-sdk: %v", sdkVersion.Version))
}
func main() {
// Add the zap logger flag set to the CLI. The flag set must
// be added before calling pflag.Parse().
pflag.CommandLine.AddFlagSet(zap.FlagSet())
// Add flags registered by imported packages (e.g. glog and
// controller-runtime)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
// Use a zap logr.Logger implementation. If none of the zap
// flags are configured (or if the zap flag set is not being
// used), this defaults to a production zap logger.
//
// The logger instantiated here can be changed to any logger
// implementing the logr.Logger interface. This logger will
// be propagated through the whole operator, generating
// uniform and structured logs.
logf.SetLogger(zap.Logger())
printVersion()
namespace, err := k8sutil.GetWatchNamespace()
if err != nil {
log.Error(err, "Failed to get watch namespace")
os.Exit(1)
}
// Get a config to talk to the apiserver
cfg, err := config.GetConfig()
if err != nil {
log.Error(err, "")
os.Exit(1)
}
ctx := context.TODO()
// Become the leader before proceeding
err = leader.Become(ctx, "collectd-operator-lock")
if err != nil {
log.Error(err, "")
os.Exit(1)
}
// Create a new Cmd to provide shared dependencies and start components
mgr, err := manager.New(cfg, manager.Options{
Namespace: namespace,
MapperProvider: restmapper.NewDynamicRESTMapper,
MetricsBindAddress: fmt.Sprintf("%s:%d", metricsHost, metricsPort),
})
if err != nil {
log.Error(err, "")
os.Exit(1)
}
log.Info("Registering Components.")
// Setup Scheme for all resources
if err := apis.AddToScheme(mgr.GetScheme()); err != nil {
log.Error(err, "")
os.Exit(1)
}
// Setup all Controllers
if err := controller.AddToManager(mgr); err != nil {
log.Error(err, "")
os.Exit(1)
}
if err = serveCRMetrics(cfg); err != nil {
log.Info("Could not generate and serve custom resource metrics", "error", err.Error())
}
// Add to the below struct any other metrics ports you want to expose.
servicePorts := []v1.ServicePort{
{Port: metricsPort, Name: metrics.OperatorPortName, Protocol: v1.ProtocolTCP, TargetPort: intstr.IntOrString{Type: intstr.Int, IntVal: metricsPort}},
{Port: operatorMetricsPort, Name: metrics.CRPortName, Protocol: v1.ProtocolTCP, TargetPort: intstr.IntOrString{Type: intstr.Int, IntVal: operatorMetricsPort}},
}
// Create Service object to expose the metrics port(s).
_, err = metrics.CreateMetricsService(ctx, cfg, servicePorts)
if err != nil {
log.Info(err.Error())
}
log.Info("Starting the Cmd.")
// Start the Cmd
if err := mgr.Start(signals.SetupSignalHandler()); err != nil {
log.Error(err, "Manager exited non-zero")
os.Exit(1)
}
}
// serveCRMetrics gets the Operator/CustomResource GVKs and generates metrics based on those types.
// It serves those metrics on "http://metricsHost:operatorMetricsPort".
func serveCRMetrics(cfg *rest.Config) error {
// Below function returns filtered operator/CustomResource specific GVKs.
// For more control override the below GVK list with your own custom logic.
filteredGVK, err := k8sutil.GetGVKsFromAddToScheme(apis.AddToScheme)
if err != nil {
return err
}
// Get the namespace the operator is currently deployed in.
operatorNs, err := k8sutil.GetOperatorNamespace()
if err != nil {
return err
}
// To generate metrics in other namespaces, add the values below.
ns := []string{operatorNs}
// Generate and serve custom resource specific metrics.
err = kubemetrics.GenerateAndServeCRMetrics(cfg, ns, filteredGVK, metricsHost, operatorMetricsPort)
if err != nil {
return err
}
return nil
}
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