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controller.go
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controller.go
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package controller
import (
"context"
"encoding/json"
"fmt"
"os"
"strconv"
gosync "sync"
"syscall"
"time"
"github.com/upper/db/v4"
"github.com/argoproj/pkg/errors"
syncpkg "github.com/argoproj/pkg/sync"
log "github.com/sirupsen/logrus"
"golang.org/x/exp/slices"
"golang.org/x/time/rate"
apiv1 "k8s.io/api/core/v1"
apierr "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/types"
runtimeutil "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/dynamic"
v1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
typedv1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
apiwatch "k8s.io/client-go/tools/watch"
"k8s.io/client-go/util/retry"
"k8s.io/client-go/util/workqueue"
"github.com/argoproj/argo-workflows/v3"
"github.com/argoproj/argo-workflows/v3/config"
argoErr "github.com/argoproj/argo-workflows/v3/errors"
"github.com/argoproj/argo-workflows/v3/persist/sqldb"
wfv1 "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
wfclientset "github.com/argoproj/argo-workflows/v3/pkg/client/clientset/versioned"
"github.com/argoproj/argo-workflows/v3/pkg/client/informers/externalversions"
wfextvv1alpha1 "github.com/argoproj/argo-workflows/v3/pkg/client/informers/externalversions/workflow/v1alpha1"
"github.com/argoproj/argo-workflows/v3/pkg/plugins/spec"
authutil "github.com/argoproj/argo-workflows/v3/util/auth"
"github.com/argoproj/argo-workflows/v3/util/diff"
"github.com/argoproj/argo-workflows/v3/util/env"
errorsutil "github.com/argoproj/argo-workflows/v3/util/errors"
"github.com/argoproj/argo-workflows/v3/workflow/artifactrepositories"
"github.com/argoproj/argo-workflows/v3/workflow/common"
controllercache "github.com/argoproj/argo-workflows/v3/workflow/controller/cache"
"github.com/argoproj/argo-workflows/v3/workflow/controller/entrypoint"
"github.com/argoproj/argo-workflows/v3/workflow/controller/estimation"
"github.com/argoproj/argo-workflows/v3/workflow/controller/indexes"
"github.com/argoproj/argo-workflows/v3/workflow/controller/informer"
"github.com/argoproj/argo-workflows/v3/workflow/controller/pod"
"github.com/argoproj/argo-workflows/v3/workflow/cron"
"github.com/argoproj/argo-workflows/v3/workflow/events"
"github.com/argoproj/argo-workflows/v3/workflow/gccontroller"
"github.com/argoproj/argo-workflows/v3/workflow/hydrator"
"github.com/argoproj/argo-workflows/v3/workflow/metrics"
"github.com/argoproj/argo-workflows/v3/workflow/signal"
"github.com/argoproj/argo-workflows/v3/workflow/sync"
"github.com/argoproj/argo-workflows/v3/workflow/util"
plugin "github.com/argoproj/argo-workflows/v3/workflow/util/plugins"
)
const maxAllowedStackDepth = 100
type recentlyCompletedWorkflow struct {
key string
when time.Time
}
type recentCompletions struct {
completions []recentlyCompletedWorkflow
mutex gosync.RWMutex
}
// WorkflowController is the controller for workflow resources
type WorkflowController struct {
// namespace of the workflow controller
namespace string
managedNamespace string
configController config.Controller
// Config is the workflow controller's configuration
Config config.Config
// get the artifact repository
artifactRepositories artifactrepositories.Interface
// get images
entrypoint entrypoint.Interface
// cliExecutorImage is the executor image as specified from the command line
cliExecutorImage string
// cliExecutorImagePullPolicy is the executor imagePullPolicy as specified from the command line
cliExecutorImagePullPolicy string
// cliExecutorLogFormat is the format in which argoexec will log
// possible options are json/text
cliExecutorLogFormat string
// restConfig is used by controller to send a SIGUSR1 to the wait sidecar using remotecommand.NewSPDYExecutor().
restConfig *rest.Config
kubeclientset kubernetes.Interface
rateLimiter *rate.Limiter
dynamicInterface dynamic.Interface
wfclientset wfclientset.Interface
// maxStackDepth is a configurable limit to the depth of the "stack", which is increased with every nested call to
// woc.executeTemplate and decreased when such calls return. This is used to prevent infinite recursion
maxStackDepth int
// datastructures to support the processing of workflows and workflow pods
wfInformer cache.SharedIndexInformer
wftmplInformer wfextvv1alpha1.WorkflowTemplateInformer
cwftmplInformer wfextvv1alpha1.ClusterWorkflowTemplateInformer
podInformer cache.SharedIndexInformer
configMapInformer cache.SharedIndexInformer
wfQueue workqueue.RateLimitingInterface
podCleanupQueue workqueue.RateLimitingInterface // pods to be deleted or labelled depend on GC strategy
throttler sync.Throttler
workflowKeyLock syncpkg.KeyLock // used to lock workflows for exclusive modification or access
session db.Session
offloadNodeStatusRepo sqldb.OffloadNodeStatusRepo
hydrator hydrator.Interface
wfArchive sqldb.WorkflowArchive
estimatorFactory estimation.EstimatorFactory
syncManager *sync.Manager
metrics *metrics.Metrics
eventRecorderManager events.EventRecorderManager
archiveLabelSelector labels.Selector
cacheFactory controllercache.Factory
wfTaskSetInformer wfextvv1alpha1.WorkflowTaskSetInformer
artGCTaskInformer wfextvv1alpha1.WorkflowArtifactGCTaskInformer
taskResultInformer cache.SharedIndexInformer
// progressPatchTickDuration defines how often the executor will patch pod annotations if an updated progress is found.
// Default is 1m and can be configured using the env var ARGO_PROGRESS_PATCH_TICK_DURATION.
progressPatchTickDuration time.Duration
// progressFileTickDuration defines how often the progress file is read.
// Default is 3s and can be configured using the env var ARGO_PROGRESS_FILE_TICK_DURATION
progressFileTickDuration time.Duration
executorPlugins map[string]map[string]*spec.Plugin // namespace -> name -> plugin
recentCompletions recentCompletions
}
type PatchOperation struct {
Operation string `json:"op"`
Path string `json:"path"`
Value interface{} `json:"value,omitempty"`
}
const (
workflowResyncPeriod = 20 * time.Minute
workflowTemplateResyncPeriod = 20 * time.Minute
podResyncPeriod = 30 * time.Minute
clusterWorkflowTemplateResyncPeriod = 20 * time.Minute
workflowExistenceCheckPeriod = 1 * time.Minute
workflowTaskSetResyncPeriod = 20 * time.Minute
)
var (
cacheGCPeriod = env.LookupEnvDurationOr("CACHE_GC_PERIOD", 0)
// semaphoreNotifyDelay is a slight delay when notifying/enqueueing workflows to the workqueue
// that are waiting on a semaphore. This value is passed to AddAfter(). We delay adding the next
// workflow because if we add immediately with AddRateLimited(), the next workflow will likely
// be reconciled at a point in time before we have finished the current workflow reconciliation
// as well as incrementing the semaphore counter availability, and so the next workflow will
// believe it cannot run. By delaying for 1s, we would have finished the semaphore counter
// updates, and the next workflow will see the updated availability.
semaphoreNotifyDelay = env.LookupEnvDurationOr("SEMAPHORE_NOTIFY_DELAY", time.Second)
)
func init() {
if cacheGCPeriod != 0 {
log.WithField("cacheGCPeriod", cacheGCPeriod).Info("GC for memoization caches will be performed every")
}
}
// NewWorkflowController instantiates a new WorkflowController
func NewWorkflowController(ctx context.Context, restConfig *rest.Config, kubeclientset kubernetes.Interface, wfclientset wfclientset.Interface, namespace, managedNamespace, executorImage, executorImagePullPolicy, executorLogFormat, configMap string, executorPlugins bool) (*WorkflowController, error) {
dynamicInterface, err := dynamic.NewForConfig(restConfig)
if err != nil {
return nil, err
}
wfc := WorkflowController{
restConfig: restConfig,
kubeclientset: kubeclientset,
dynamicInterface: dynamicInterface,
wfclientset: wfclientset,
namespace: namespace,
managedNamespace: managedNamespace,
cliExecutorImage: executorImage,
cliExecutorImagePullPolicy: executorImagePullPolicy,
cliExecutorLogFormat: executorLogFormat,
configController: config.NewController(namespace, configMap, kubeclientset),
workflowKeyLock: syncpkg.NewKeyLock(),
cacheFactory: controllercache.NewCacheFactory(kubeclientset, namespace),
eventRecorderManager: events.NewEventRecorderManager(kubeclientset),
progressPatchTickDuration: env.LookupEnvDurationOr(common.EnvVarProgressPatchTickDuration, 1*time.Minute),
progressFileTickDuration: env.LookupEnvDurationOr(common.EnvVarProgressFileTickDuration, 3*time.Second),
}
if executorPlugins {
wfc.executorPlugins = map[string]map[string]*spec.Plugin{}
}
wfc.UpdateConfig(ctx)
wfc.maxStackDepth = wfc.getMaxStackDepth()
wfc.metrics = metrics.New(wfc.getMetricsServerConfig())
wfc.entrypoint = entrypoint.New(kubeclientset, wfc.Config.Images)
workqueue.SetProvider(wfc.metrics) // must execute SetProvider before we created the queues
wfc.wfQueue = wfc.metrics.RateLimiterWithBusyWorkers(&fixedItemIntervalRateLimiter{}, "workflow_queue")
wfc.throttler = wfc.newThrottler()
wfc.podCleanupQueue = wfc.metrics.RateLimiterWithBusyWorkers(workqueue.DefaultControllerRateLimiter(), "pod_cleanup_queue")
return &wfc, nil
}
func (wfc *WorkflowController) newThrottler() sync.Throttler {
f := func(key string) { wfc.wfQueue.AddRateLimited(key) }
return sync.ChainThrottler{
sync.NewThrottler(wfc.Config.Parallelism, sync.SingleBucket, f),
sync.NewThrottler(wfc.Config.NamespaceParallelism, sync.NamespaceBucket, f),
}
}
// runGCcontroller runs the workflow garbage collector controller
func (wfc *WorkflowController) runGCcontroller(ctx context.Context, workflowTTLWorkers int) {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
gcCtrl := gccontroller.NewController(wfc.wfclientset, wfc.wfInformer, wfc.metrics, wfc.Config.RetentionPolicy)
err := gcCtrl.Run(ctx.Done(), workflowTTLWorkers)
if err != nil {
panic(err)
}
}
func (wfc *WorkflowController) runCronController(ctx context.Context, cronWorkflowWorkers int) {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
cronController := cron.NewCronController(wfc.wfclientset, wfc.dynamicInterface, wfc.namespace, wfc.GetManagedNamespace(), wfc.Config.InstanceID, wfc.metrics, wfc.eventRecorderManager, cronWorkflowWorkers, wfc.wftmplInformer, wfc.cwftmplInformer)
cronController.Run(ctx)
}
var indexers = cache.Indexers{
indexes.ClusterWorkflowTemplateIndex: indexes.MetaNamespaceLabelIndexFunc(common.LabelKeyClusterWorkflowTemplate),
indexes.CronWorkflowIndex: indexes.MetaNamespaceLabelIndexFunc(common.LabelKeyCronWorkflow),
indexes.WorkflowTemplateIndex: indexes.MetaNamespaceLabelIndexFunc(common.LabelKeyWorkflowTemplate),
indexes.SemaphoreConfigIndexName: indexes.WorkflowSemaphoreKeysIndexFunc(),
indexes.WorkflowPhaseIndex: indexes.MetaWorkflowPhaseIndexFunc(),
indexes.ConditionsIndex: indexes.ConditionsIndexFunc,
indexes.UIDIndex: indexes.MetaUIDFunc,
cache.NamespaceIndex: cache.MetaNamespaceIndexFunc,
}
// Run starts a Workflow resource controller
func (wfc *WorkflowController) Run(ctx context.Context, wfWorkers, workflowTTLWorkers, podCleanupWorkers, cronWorkflowWorkers int) {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
// init DB after leader election (if enabled)
if err := wfc.initDB(); err != nil {
log.Fatalf("Failed to init db: %v", err)
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
defer wfc.wfQueue.ShutDown()
defer wfc.podCleanupQueue.ShutDown()
log.WithField("version", argo.GetVersion().Version).
WithField("defaultRequeueTime", GetRequeueTime()).
Info("Starting Workflow Controller")
log.WithField("workflowWorkers", wfWorkers).
WithField("workflowTtlWorkers", workflowTTLWorkers).
WithField("podCleanup", podCleanupWorkers).
Info("Current Worker Numbers")
wfc.wfInformer = util.NewWorkflowInformer(wfc.dynamicInterface, wfc.GetManagedNamespace(), workflowResyncPeriod, wfc.tweakListRequestListOptions, wfc.tweakWatchRequestListOptions, indexers)
wfc.wftmplInformer = informer.NewTolerantWorkflowTemplateInformer(wfc.dynamicInterface, workflowTemplateResyncPeriod, wfc.managedNamespace)
var err error
wfc.wfTaskSetInformer, err = wfc.newWorkflowTaskSetInformer()
if err != nil {
log.Fatal(err)
}
wfc.artGCTaskInformer, err = wfc.newArtGCTaskInformer()
if err != nil {
log.Fatal(err)
}
wfc.taskResultInformer, err = wfc.newWorkflowTaskResultInformer()
if err != nil {
log.Fatal(err)
}
err = wfc.addWorkflowInformerHandlers(ctx)
if err != nil {
log.Fatal(err)
}
wfc.podInformer, err = wfc.newPodInformer(ctx)
if err != nil {
log.Fatal(err)
}
wfc.updateEstimatorFactory()
wfc.configMapInformer, err = wfc.newConfigMapInformer()
if err != nil {
log.Fatal(err)
}
// Create Synchronization Manager
wfc.createSynchronizationManager(ctx)
// init managers: throttler and SynchronizationManager
if err := wfc.initManagers(ctx); err != nil {
log.Fatal(err)
}
if os.Getenv("WATCH_CONTROLLER_SEMAPHORE_CONFIGMAPS") != "false" {
go wfc.runConfigMapWatcher(ctx.Done())
}
go wfc.wfInformer.Run(ctx.Done())
go wfc.wftmplInformer.Informer().Run(ctx.Done())
go wfc.podInformer.Run(ctx.Done())
go wfc.configMapInformer.Run(ctx.Done())
go wfc.wfTaskSetInformer.Informer().Run(ctx.Done())
go wfc.artGCTaskInformer.Informer().Run(ctx.Done())
go wfc.taskResultInformer.Run(ctx.Done())
wfc.createClusterWorkflowTemplateInformer(ctx)
// Wait for all involved caches to be synced, before processing items from the queue is started
if !cache.WaitForCacheSync(
ctx.Done(),
wfc.wfInformer.HasSynced,
wfc.wftmplInformer.Informer().HasSynced,
wfc.podInformer.HasSynced,
wfc.configMapInformer.HasSynced,
wfc.wfTaskSetInformer.Informer().HasSynced,
wfc.artGCTaskInformer.Informer().HasSynced,
wfc.taskResultInformer.HasSynced,
) {
log.Fatal("Timed out waiting for caches to sync")
}
for i := 0; i < podCleanupWorkers; i++ {
go wait.UntilWithContext(ctx, wfc.runPodCleanup, time.Second)
}
go wfc.workflowGarbageCollector(ctx.Done())
go wfc.archivedWorkflowGarbageCollector(ctx.Done())
go wfc.runGCcontroller(ctx, workflowTTLWorkers)
go wfc.runCronController(ctx, cronWorkflowWorkers)
go wait.Until(wfc.syncWorkflowPhaseMetrics, 15*time.Second, ctx.Done())
go wait.Until(wfc.syncPodPhaseMetrics, 15*time.Second, ctx.Done())
go wait.Until(wfc.syncManager.CheckWorkflowExistence, workflowExistenceCheckPeriod, ctx.Done())
for i := 0; i < wfWorkers; i++ {
go wait.Until(wfc.runWorker, time.Second, ctx.Done())
}
if cacheGCPeriod != 0 {
go wait.JitterUntilWithContext(ctx, wfc.syncAllCacheForGC, cacheGCPeriod, 0.0, true)
}
<-ctx.Done()
}
func (wfc *WorkflowController) RunMetricsServer(ctx context.Context, isDummy bool) {
go wfc.metrics.RunServer(ctx, isDummy)
}
// Create and the Synchronization Manager
func (wfc *WorkflowController) createSynchronizationManager(ctx context.Context) {
getSyncLimit := func(lockKey string) (int, error) {
lockName, err := sync.DecodeLockName(lockKey)
if err != nil {
return 0, err
}
configMap, err := wfc.kubeclientset.CoreV1().ConfigMaps(lockName.Namespace).Get(ctx, lockName.ResourceName, metav1.GetOptions{})
if err != nil {
return 0, err
}
value, found := configMap.Data[lockName.Key]
if !found {
return 0, argoErr.New(argoErr.CodeBadRequest, fmt.Sprintf("Sync configuration key '%s' not found in ConfigMap", lockName.Key))
}
return strconv.Atoi(value)
}
nextWorkflow := func(key string) {
wfc.wfQueue.AddAfter(key, semaphoreNotifyDelay)
}
isWFDeleted := func(key string) bool {
_, exists, err := wfc.wfInformer.GetIndexer().GetByKey(key)
if err != nil {
log.WithFields(log.Fields{"key": key, "error": err}).Error("Failed to get workflow from informer")
return false
}
return exists
}
wfc.syncManager = sync.NewLockManager(getSyncLimit, nextWorkflow, isWFDeleted)
}
// list all running workflows to initialize throttler and syncManager
func (wfc *WorkflowController) initManagers(ctx context.Context) error {
labelSelector := labels.NewSelector().Add(util.InstanceIDRequirement(wfc.Config.InstanceID))
req, _ := labels.NewRequirement(common.LabelKeyPhase, selection.Equals, []string{string(wfv1.WorkflowRunning)})
if req != nil {
labelSelector = labelSelector.Add(*req)
}
listOpts := metav1.ListOptions{LabelSelector: labelSelector.String()}
wfList, err := wfc.wfclientset.ArgoprojV1alpha1().Workflows(wfc.GetManagedNamespace()).List(ctx, listOpts)
if err != nil {
return err
}
wfc.syncManager.Initialize(wfList.Items)
if err := wfc.throttler.Init(wfList.Items); err != nil {
return err
}
return nil
}
func (wfc *WorkflowController) runConfigMapWatcher(stopCh <-chan struct{}) {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
ctx := context.Background()
retryWatcher, err := apiwatch.NewRetryWatcher("1", &cache.ListWatch{
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return wfc.kubeclientset.CoreV1().ConfigMaps(wfc.managedNamespace).Watch(ctx, metav1.ListOptions{})
},
})
if err != nil {
panic(err)
}
defer retryWatcher.Stop()
for {
select {
case event := <-retryWatcher.ResultChan():
cm, ok := event.Object.(*apiv1.ConfigMap)
if !ok {
log.Errorf("invalid config map object received in config watcher. Ignored processing")
continue
}
log.Debugf("received config map %s/%s update", cm.Namespace, cm.Name)
if cm.GetName() == wfc.configController.GetName() && wfc.namespace == cm.GetNamespace() {
log.Infof("Received Workflow Controller config map %s/%s update", cm.Namespace, cm.Name)
wfc.UpdateConfig(ctx)
}
wfc.notifySemaphoreConfigUpdate(cm)
case <-stopCh:
return
}
}
}
// notifySemaphoreConfigUpdate will notify semaphore config update to pending workflows
func (wfc *WorkflowController) notifySemaphoreConfigUpdate(cm *apiv1.ConfigMap) {
wfs, err := wfc.wfInformer.GetIndexer().ByIndex(indexes.SemaphoreConfigIndexName, fmt.Sprintf("%s/%s", cm.Namespace, cm.Name))
if err != nil {
log.Errorf("failed get the workflow from informer. %v", err)
}
for _, obj := range wfs {
un, ok := obj.(*unstructured.Unstructured)
if !ok {
log.Warnf("received object from indexer %s is not an unstructured", indexes.SemaphoreConfigIndexName)
continue
}
wfc.wfQueue.AddRateLimited(fmt.Sprintf("%s/%s", un.GetNamespace(), un.GetName()))
}
}
// Check if the controller has RBAC access to ClusterWorkflowTemplates
func (wfc *WorkflowController) createClusterWorkflowTemplateInformer(ctx context.Context) {
cwftGetAllowed, err := authutil.CanI(ctx, wfc.kubeclientset, "get", "clusterworkflowtemplates", wfc.namespace, "")
errors.CheckError(err)
cwftListAllowed, err := authutil.CanI(ctx, wfc.kubeclientset, "list", "clusterworkflowtemplates", wfc.namespace, "")
errors.CheckError(err)
cwftWatchAllowed, err := authutil.CanI(ctx, wfc.kubeclientset, "watch", "clusterworkflowtemplates", wfc.namespace, "")
errors.CheckError(err)
if cwftGetAllowed && cwftListAllowed && cwftWatchAllowed {
wfc.cwftmplInformer = informer.NewTolerantClusterWorkflowTemplateInformer(wfc.dynamicInterface, clusterWorkflowTemplateResyncPeriod)
go wfc.cwftmplInformer.Informer().Run(ctx.Done())
// since the above call is asynchronous, make sure we populate our cache before we try to use it later
if !cache.WaitForCacheSync(
ctx.Done(),
wfc.cwftmplInformer.Informer().HasSynced,
) {
log.Fatal("Timed out waiting for ClusterWorkflowTemplate cache to sync")
}
} else {
log.Warnf("Controller doesn't have RBAC access for ClusterWorkflowTemplates")
}
}
func (wfc *WorkflowController) UpdateConfig(ctx context.Context) {
c, err := wfc.configController.Get(ctx)
if err != nil {
log.Fatalf("Failed to register watch for controller config map: %v", err)
}
wfc.Config = *c
err = wfc.updateConfig()
if err != nil {
log.Fatalf("Failed to update config: %v", err)
}
}
func (wfc *WorkflowController) queuePodForCleanup(namespace string, podName string, action podCleanupAction) {
wfc.podCleanupQueue.AddRateLimited(newPodCleanupKey(namespace, podName, action))
}
func (wfc *WorkflowController) queuePodForCleanupAfter(namespace string, podName string, action podCleanupAction, duration time.Duration) {
wfc.podCleanupQueue.AddAfter(newPodCleanupKey(namespace, podName, action), duration)
}
func (wfc *WorkflowController) runPodCleanup(ctx context.Context) {
for wfc.processNextPodCleanupItem(ctx) {
}
}
// all pods will ultimately be cleaned up by either deleting them, or labelling them
func (wfc *WorkflowController) processNextPodCleanupItem(ctx context.Context) bool {
key, quit := wfc.podCleanupQueue.Get()
if quit {
return false
}
defer func() {
wfc.podCleanupQueue.Forget(key)
wfc.podCleanupQueue.Done(key)
}()
namespace, podName, action := parsePodCleanupKey(key.(podCleanupKey))
logCtx := log.WithFields(log.Fields{"key": key, "action": action})
logCtx.Info("cleaning up pod")
err := func() error {
switch action {
case terminateContainers:
pod, err := wfc.getPodFromCache(namespace, podName)
if err == nil && pod != nil && pod.Status.Phase == apiv1.PodPending {
wfc.queuePodForCleanup(namespace, podName, deletePod)
} else if terminationGracePeriod, err := wfc.signalContainers(ctx, namespace, podName, syscall.SIGTERM); err != nil {
return err
} else if terminationGracePeriod > 0 {
wfc.queuePodForCleanupAfter(namespace, podName, killContainers, terminationGracePeriod)
}
case killContainers:
if _, err := wfc.signalContainers(ctx, namespace, podName, syscall.SIGKILL); err != nil {
return err
}
case labelPodCompleted:
pods := wfc.kubeclientset.CoreV1().Pods(namespace)
if err := wfc.enablePodForDeletion(ctx, pods, namespace, podName, true); err != nil {
return err
}
case deletePod:
pods := wfc.kubeclientset.CoreV1().Pods(namespace)
if err := wfc.enablePodForDeletion(ctx, pods, namespace, podName, false); err != nil {
return err
}
propagation := metav1.DeletePropagationBackground
err := pods.Delete(ctx, podName, metav1.DeleteOptions{
PropagationPolicy: &propagation,
GracePeriodSeconds: wfc.Config.PodGCGracePeriodSeconds,
})
if err != nil && !apierr.IsNotFound(err) {
return err
}
}
return nil
}()
if err != nil {
logCtx.WithError(err).Warn("failed to clean-up pod")
if errorsutil.IsTransientErr(err) {
wfc.podCleanupQueue.AddRateLimited(key)
}
}
return true
}
func (wfc *WorkflowController) getPodFromAPI(ctx context.Context, namespace string, podName string) (*apiv1.Pod, error) {
pod, err := wfc.kubeclientset.CoreV1().Pods(namespace).Get(ctx, podName, metav1.GetOptions{})
if err != nil {
return nil, err
}
return pod, nil
}
func (wfc *WorkflowController) getPodFromCache(namespace string, podName string) (*apiv1.Pod, error) {
obj, exists, err := wfc.podInformer.GetStore().GetByKey(namespace + "/" + podName)
if err != nil {
return nil, err
}
if !exists {
return nil, nil
}
pod, ok := obj.(*apiv1.Pod)
if !ok {
return nil, fmt.Errorf("object is not a pod")
}
return pod, nil
}
func (wfc *WorkflowController) enablePodForDeletion(ctx context.Context, pods typedv1.PodInterface, namespace string, podName string, isCompleted bool) error {
// Get current Pod from K8S and update it to remove finalizer, and if the Pod was completed, set the Label
// In the case that the Pod changed in between Get and Update, we'll get a conflict error and can try again
err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
currentPod, err := wfc.getPodFromAPI(ctx, namespace, podName)
if err != nil {
return err
}
updatedPod := currentPod.DeepCopy()
if isCompleted {
if updatedPod.Labels == nil {
updatedPod.Labels = make(map[string]string)
}
updatedPod.Labels[common.LabelKeyCompleted] = "true"
}
updatedPod.Finalizers = removeFinalizer(updatedPod.Finalizers, common.FinalizerPodStatus)
_, err = pods.Update(ctx, updatedPod, metav1.UpdateOptions{})
return err
})
if err != nil {
return err
}
return nil
}
func removeFinalizer(finalizers []string, targetFinalizer string) []string {
var updatedFinalizers []string
for _, finalizer := range finalizers {
if finalizer != targetFinalizer {
updatedFinalizers = append(updatedFinalizers, finalizer)
}
}
return updatedFinalizers
}
func (wfc *WorkflowController) signalContainers(ctx context.Context, namespace string, podName string, sig syscall.Signal) (time.Duration, error) {
pod, err := wfc.getPodFromCache(namespace, podName)
if pod == nil || err != nil {
return 0, err
}
for _, c := range pod.Status.ContainerStatuses {
if c.State.Running == nil {
continue
}
// problems are already logged at info level, so we just ignore errors here
_ = signal.SignalContainer(ctx, wfc.restConfig, pod, c.Name, sig)
}
if pod.Spec.TerminationGracePeriodSeconds == nil {
return 30 * time.Second, nil
}
return time.Duration(*pod.Spec.TerminationGracePeriodSeconds) * time.Second, nil
}
func (wfc *WorkflowController) workflowGarbageCollector(stopCh <-chan struct{}) {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
periodicity := env.LookupEnvDurationOr("WORKFLOW_GC_PERIOD", 5*time.Minute)
log.WithField("periodicity", periodicity).Info("Performing periodic GC")
ticker := time.NewTicker(periodicity)
for {
select {
case <-stopCh:
ticker.Stop()
return
case <-ticker.C:
if wfc.offloadNodeStatusRepo.IsEnabled() {
log.Info("Performing periodic workflow GC")
oldRecords, err := wfc.offloadNodeStatusRepo.ListOldOffloads(wfc.GetManagedNamespace())
if err != nil {
log.WithField("err", err).Error("Failed to list old offloaded nodes")
continue
}
log.WithField("len_wfs", len(oldRecords)).Info("Deleting old offloads that are not live")
for uid, versions := range oldRecords {
if err := wfc.deleteOffloadedNodesForWorkflow(uid, versions); err != nil {
log.WithError(err).WithField("uid", uid).Error("Failed to delete old offloaded nodes")
}
}
log.Info("Workflow GC finished")
}
}
}
}
func (wfc *WorkflowController) deleteOffloadedNodesForWorkflow(uid string, versions []string) error {
workflows, err := wfc.wfInformer.GetIndexer().ByIndex(indexes.UIDIndex, uid)
if err != nil {
return err
}
var wf *wfv1.Workflow
switch l := len(workflows); l {
case 0:
log.WithField("uid", uid).Info("Workflow missing, probably deleted")
case 1:
un, ok := workflows[0].(*unstructured.Unstructured)
if !ok {
return fmt.Errorf("object %+v is not an unstructured", workflows[0])
}
key := un.GetNamespace() + "/" + un.GetName()
wfc.workflowKeyLock.Lock(key)
defer wfc.workflowKeyLock.Unlock(key)
obj, ok := wfc.getWorkflowByKey(key)
if !ok {
return fmt.Errorf("failed to get workflow by key after locking")
}
un, ok = obj.(*unstructured.Unstructured)
if !ok {
return fmt.Errorf("object %+v is not an unstructured", obj)
}
wf, err = util.FromUnstructured(un)
if err != nil {
return err
}
// workflow might still be hydrated
if wfc.hydrator.IsHydrated(wf) {
log.WithField("uid", wf.UID).Info("Hydrated workflow encountered")
err = wfc.hydrator.Dehydrate(wf)
if err != nil {
return err
}
}
default:
return fmt.Errorf("expected no more than 1 workflow, got %d", l)
}
for _, version := range versions {
// skip delete if offload is live
if wf != nil && wf.Status.OffloadNodeStatusVersion == version {
continue
}
if err := wfc.offloadNodeStatusRepo.Delete(uid, version); err != nil {
return err
}
}
return nil
}
func (wfc *WorkflowController) archivedWorkflowGarbageCollector(stopCh <-chan struct{}) {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
periodicity := env.LookupEnvDurationOr("ARCHIVED_WORKFLOW_GC_PERIOD", 24*time.Hour)
if wfc.Config.Persistence == nil {
log.Info("Persistence disabled - so archived workflow GC disabled - you must restart the controller if you enable this")
return
}
if !wfc.Config.Persistence.Archive {
log.Info("Archive disabled - so archived workflow GC disabled - you must restart the controller if you enable this")
return
}
ttl := wfc.Config.Persistence.ArchiveTTL
if ttl == config.TTL(0) {
log.Info("Archived workflows TTL zero - so archived workflow GC disabled - you must restart the controller if you enable this")
return
}
log.WithFields(log.Fields{"ttl": ttl, "periodicity": periodicity}).Info("Performing archived workflow GC")
ticker := time.NewTicker(periodicity)
defer ticker.Stop()
for {
select {
case <-stopCh:
return
case <-ticker.C:
log.Info("Performing archived workflow GC")
err := wfc.wfArchive.DeleteExpiredWorkflows(time.Duration(ttl))
if err != nil {
log.WithField("err", err).Error("Failed to delete archived workflows")
}
}
}
}
func (wfc *WorkflowController) runWorker() {
defer runtimeutil.HandleCrash(runtimeutil.PanicHandlers...)
ctx := context.Background()
for wfc.processNextItem(ctx) {
}
}
// processNextItem is the worker logic for handling workflow updates
func (wfc *WorkflowController) processNextItem(ctx context.Context) bool {
key, quit := wfc.wfQueue.Get()
if quit {
return false
}
defer wfc.wfQueue.Done(key)
wfc.workflowKeyLock.Lock(key.(string))
defer wfc.workflowKeyLock.Unlock(key.(string))
obj, ok := wfc.getWorkflowByKey(key.(string))
if !ok {
return true
}
// The workflow informer receives unstructured objects to deal with the possibility of invalid
// workflow manifests that are unable to unmarshal to workflow objects
un, ok := obj.(*unstructured.Unstructured)
if !ok {
log.WithFields(log.Fields{"key": key}).Warn("Index is not an unstructured")
return true
}
if !reconciliationNeeded(un) {
log.WithFields(log.Fields{"key": key}).Debug("Won't process Workflow since it's completed")
return true
}
wf, err := util.FromUnstructured(un)
if err != nil {
log.WithFields(log.Fields{"key": key, "error": err}).Warn("Failed to unmarshal key to workflow object")
woc := newWorkflowOperationCtx(wf, wfc)
woc.markWorkflowFailed(ctx, fmt.Sprintf("cannot unmarshall spec: %s", err.Error()))
woc.persistUpdates(ctx)
return true
}
if wf.Status.Phase != "" && wfc.checkRecentlyCompleted(wf.ObjectMeta.Name) {
log.WithFields(log.Fields{"name": wf.ObjectMeta.Name}).Warn("Cache: Rejecting recently deleted")
return true
}
// this will ensure we process every incomplete workflow once every 20m
wfc.wfQueue.AddAfter(key, workflowResyncPeriod)
woc := newWorkflowOperationCtx(wf, wfc)
if !(woc.GetShutdownStrategy().Enabled() && woc.GetShutdownStrategy() == wfv1.ShutdownStrategyTerminate) && !wfc.throttler.Admit(key.(string)) {
log.WithField("key", key).Info("Workflow processing has been postponed due to max parallelism limit")
if woc.wf.Status.Phase == wfv1.WorkflowUnknown {
woc.markWorkflowPhase(ctx, wfv1.WorkflowPending, "Workflow processing has been postponed because too many workflows are already running")
woc.persistUpdates(ctx)
}
return true
}
// make sure this is removed from the throttler is complete
defer func() {
// must be done with woc
if !reconciliationNeeded(woc.wf) {
wfc.throttler.Remove(key.(string))
}
}()
err = wfc.hydrator.Hydrate(woc.wf)
if err != nil {
woc.log.Errorf("hydration failed: %v", err)
woc.markWorkflowError(ctx, err)
woc.persistUpdates(ctx)
return true
}
startTime := time.Now()
woc.operate(ctx)
wfc.metrics.OperationCompleted(time.Since(startTime).Seconds())
// TODO: operate should return error if it was unable to operate properly
// so we can requeue the work for a later time
// See: https://github.com/kubernetes/client-go/blob/master/examples/workqueue/main.go
// c.handleErr(err, key)
return true
}
func (wfc *WorkflowController) getWorkflowByKey(key string) (interface{}, bool) {
obj, exists, err := wfc.wfInformer.GetIndexer().GetByKey(key)
if err != nil {
log.WithFields(log.Fields{"key": key, "error": err}).Error("Failed to get workflow from informer")
return nil, false
}
if !exists {
// This happens after a workflow was labeled with completed=true
// or was deleted, but the work queue still had an entry for it.
return nil, false
}
return obj, true
}
func reconciliationNeeded(wf metav1.Object) bool {
return wf.GetLabels()[common.LabelKeyCompleted] != "true" || slices.Contains(wf.GetFinalizers(), common.FinalizerArtifactGC)
}
// enqueueWfFromPodLabel will extract the workflow name from pod label and
// enqueue workflow for processing
func (wfc *WorkflowController) enqueueWfFromPodLabel(obj interface{}) error {
pod, ok := obj.(*apiv1.Pod)
if !ok {
return fmt.Errorf("Key in index is not a pod")
}
if pod.Labels == nil {
return fmt.Errorf("Pod did not have labels")
}
workflowName, ok := pod.Labels[common.LabelKeyWorkflow]
if !ok {
// Ignore pods unrelated to workflow (this shouldn't happen unless the watch is setup incorrectly)
return fmt.Errorf("Watch returned pod unrelated to any workflow")
}
wfc.wfQueue.AddRateLimited(pod.ObjectMeta.Namespace + "/" + workflowName)
return nil
}
func (wfc *WorkflowController) tweakListRequestListOptions(options *metav1.ListOptions) {
labelSelector := labels.NewSelector().
Add(util.InstanceIDRequirement(wfc.Config.InstanceID))
options.LabelSelector = labelSelector.String()
// `ResourceVersion=0` does not honor the `limit` in API calls, which results in making significant List calls
// without `limit`. For details, see https://github.com/argoproj/argo-workflows/pull/11343
options.ResourceVersion = ""
}
func (wfc *WorkflowController) tweakWatchRequestListOptions(options *metav1.ListOptions) {
labelSelector := labels.NewSelector().
Add(util.InstanceIDRequirement(wfc.Config.InstanceID))
options.LabelSelector = labelSelector.String()
}
func getWfPriority(obj interface{}) (int32, time.Time) {
un, ok := obj.(*unstructured.Unstructured)
if !ok {
return 0, time.Now()
}
priority, hasPriority, err := unstructured.NestedInt64(un.Object, "spec", "priority")
if err != nil {
return 0, un.GetCreationTimestamp().Time
}
if !hasPriority {
priority = 0
}
return int32(priority), un.GetCreationTimestamp().Time
}
// 10 minutes in the past
const maxCompletedStoreTime = time.Second * -600
// This is a helper function for expiring old records of workflows
// completed more than maxCompletedStoreTime ago
func (wfc *WorkflowController) cleanCompletedWorkflowsRecord() {
cutoff := time.Now().Add(maxCompletedStoreTime)
removeIndex := -1
wfc.recentCompletions.mutex.Lock()
defer wfc.recentCompletions.mutex.Unlock()
for i, val := range wfc.recentCompletions.completions {
if val.when.After(cutoff) {
removeIndex = i - 1
break
}
}
if removeIndex >= 0 {
wfc.recentCompletions.completions = wfc.recentCompletions.completions[removeIndex+1:]
}
}
// Records a workflow as recently completed in the list
// if it isn't already in the list
func (wfc *WorkflowController) recordCompletedWorkflow(key string) {
if !wfc.checkRecentlyCompleted(key) {
wfc.recentCompletions.mutex.Lock()
defer wfc.recentCompletions.mutex.Unlock()
wfc.recentCompletions.completions = append(wfc.recentCompletions.completions,
recentlyCompletedWorkflow{
key: key,
when: time.Now(),
})
}
}
// Returns true if the workflow given by key is in the recently completed
// list. Will perform expiry cleanup before checking.