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run.go
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run.go
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package controller
import (
"context"
"sync"
"time"
"github.com/go-logr/logr"
"github.com/kyverno/kyverno/pkg/metrics"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
sdkmetric "go.opentelemetry.io/otel/metric"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
type reconcileFunc func(ctx context.Context, logger logr.Logger, key string, namespace string, name string) error
type controllerMetrics struct {
controllerName string
reconcileTotal sdkmetric.Int64Counter
requeueTotal sdkmetric.Int64Counter
queueDropTotal sdkmetric.Int64Counter
}
func newControllerMetrics(logger logr.Logger, controllerName string) *controllerMetrics {
meter := otel.GetMeterProvider().Meter(metrics.MeterName)
reconcileTotal, err := meter.Int64Counter(
"kyverno_controller_reconcile",
sdkmetric.WithDescription("can be used to track number of reconciliation cycles"))
if err != nil {
logger.Error(err, "Failed to create instrument, kyverno_controller_reconcile_total")
}
requeueTotal, err := meter.Int64Counter(
"kyverno_controller_requeue",
sdkmetric.WithDescription("can be used to track number of reconciliation errors"))
if err != nil {
logger.Error(err, "Failed to create instrument, kyverno_controller_requeue_total")
}
queueDropTotal, err := meter.Int64Counter(
"kyverno_controller_drop",
sdkmetric.WithDescription("can be used to track number of queue drops"))
if err != nil {
logger.Error(err, "Failed to create instrument, kyverno_controller_drop_total")
}
return &controllerMetrics{
controllerName: controllerName,
reconcileTotal: reconcileTotal,
requeueTotal: requeueTotal,
queueDropTotal: queueDropTotal,
}
}
func Run(ctx context.Context, logger logr.Logger, controllerName string, period time.Duration, queue workqueue.RateLimitingInterface, n, maxRetries int, r reconcileFunc, routines ...func(context.Context, logr.Logger)) {
logger.Info("starting ...")
defer logger.Info("stopped")
var wg sync.WaitGroup
defer wg.Wait()
defer runtime.HandleCrash()
metric := newControllerMetrics(logger, controllerName)
func() {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
defer queue.ShutDown()
for i := 0; i < n; i++ {
wg.Add(1)
go func(logger logr.Logger) {
logger.Info("starting worker")
defer logger.Info("worker stopped")
defer wg.Done()
wait.UntilWithContext(ctx, func(ctx context.Context) { worker(ctx, logger, metric, queue, maxRetries, r) }, period)
}(logger.WithName("worker").WithValues("id", i))
}
for i, routine := range routines {
wg.Add(1)
go func(logger logr.Logger, routine func(context.Context, logr.Logger)) {
logger.Info("starting routine")
defer logger.Info("routine stopped")
defer wg.Done()
routine(ctx, logger)
}(logger.WithName("routine").WithValues("id", i), routine)
}
<-ctx.Done()
}()
logger.Info("waiting for workers to terminate ...")
}
func worker(ctx context.Context, logger logr.Logger, metric *controllerMetrics, queue workqueue.RateLimitingInterface, maxRetries int, r reconcileFunc) {
for processNextWorkItem(ctx, logger, metric, queue, maxRetries, r) {
}
}
func processNextWorkItem(ctx context.Context, logger logr.Logger, metric *controllerMetrics, queue workqueue.RateLimitingInterface, maxRetries int, r reconcileFunc) bool {
if obj, quit := queue.Get(); !quit {
defer queue.Done(obj)
handleErr(ctx, logger, metric, queue, maxRetries, reconcile(ctx, logger, obj, r), obj)
return true
}
return false
}
func handleErr(ctx context.Context, logger logr.Logger, metric *controllerMetrics, queue workqueue.RateLimitingInterface, maxRetries int, err error, obj interface{}) {
if metric.reconcileTotal != nil {
metric.reconcileTotal.Add(ctx, 1, sdkmetric.WithAttributes(attribute.String("controller_name", metric.controllerName)))
}
if err == nil {
queue.Forget(obj)
} else if errors.IsNotFound(err) {
logger.V(4).Info("Dropping request from the queue", "obj", obj, "error", err.Error())
queue.Forget(obj)
} else if queue.NumRequeues(obj) < maxRetries {
logger.Info("Retrying request", "obj", obj, "error", err.Error())
queue.AddRateLimited(obj)
if metric.requeueTotal != nil {
metric.requeueTotal.Add(
ctx,
1,
sdkmetric.WithAttributes(
attribute.String("controller_name", metric.controllerName),
attribute.Int("num_requeues", queue.NumRequeues(obj)),
),
)
}
} else {
logger.Error(err, "Failed to process request", "obj", obj)
queue.Forget(obj)
if metric.queueDropTotal != nil {
metric.queueDropTotal.Add(
ctx,
1,
sdkmetric.WithAttributes(
attribute.String("controller_name", metric.controllerName),
),
)
}
}
}
func reconcile(ctx context.Context, logger logr.Logger, obj interface{}, r reconcileFunc) error {
start := time.Now()
var k, ns, n string
if key, ok := obj.(cache.ExplicitKey); ok {
k = string(key)
} else {
k = obj.(string)
if namespace, name, err := cache.SplitMetaNamespaceKey(k); err != nil {
return err
} else {
ns, n = namespace, name
}
}
logger = logger.WithValues("key", k, "namespace", ns, "name", n)
logger.V(4).Info("reconciling ...")
defer func(start time.Time) {
logger.V(4).Info("done", "duration", time.Since(start).String())
}(start)
return r(ctx, logger, k, ns, n)
}