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controller.go
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controller.go
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package controller
import (
"context"
"github.com/argoproj/argo"
wfv1 "github.com/argoproj/argo/api/workflow/v1"
"github.com/argoproj/argo/errors"
workflowclient "github.com/argoproj/argo/workflow/client"
"github.com/argoproj/argo/workflow/common"
"github.com/ghodss/yaml"
log "github.com/sirupsen/logrus"
apiv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
)
type WorkflowController struct {
// ConfigMap is the name of the config map in which to derive configuration of the controller from
ConfigMap string
WorkflowClient *workflowclient.WorkflowClient
WorkflowScheme *runtime.Scheme
Config WorkflowControllerConfig
clientset *kubernetes.Clientset
podCl corev1.PodInterface
wfUpdates chan *wfv1.Workflow
podUpdates chan *apiv1.Pod
}
type WorkflowControllerConfig struct {
ExecutorImage string `json:"executorImage,omitempty"`
ArtifactRepository ArtifactRepository `json:"artifactRepository,omitempty"`
}
// ArtifactRepository represents a artifact repository in which a controller will store its artifacts
type ArtifactRepository struct {
S3 *S3ArtifactRepository `json:"s3,omitempty"`
// Future artifact repository support here
}
type S3ArtifactRepository struct {
wfv1.S3Bucket `json:",inline"`
// KeyPrefix is prefix used as part of the bucket key in which the controller will store artifacts.
KeyPrefix string `json:"keyPrefix,omitempty"`
}
// NewWorkflowController instantiates a new WorkflowController
func NewWorkflowController(config *rest.Config, configMap string) *WorkflowController {
// make a new config for our extension's API group, using the first config as a baseline
wfClient, wfScheme, err := workflowclient.NewClient(config)
if err != nil {
panic(err)
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err)
}
wfc := WorkflowController{
clientset: clientset,
WorkflowClient: wfClient,
WorkflowScheme: wfScheme,
ConfigMap: configMap,
podCl: clientset.CoreV1().Pods(apiv1.NamespaceDefault),
wfUpdates: make(chan *wfv1.Workflow),
podUpdates: make(chan *apiv1.Pod),
}
return &wfc
}
// Run starts an Workflow resource controller
func (wfc *WorkflowController) Run(ctx context.Context) error {
log.Info("Watch Workflow objects")
// Watch Workflow objects
_, err := wfc.watchWorkflows(ctx)
if err != nil {
log.Errorf("Failed to register watch for Workflow resource: %v", err)
return err
}
// Watch pods related to workflows
_, err = wfc.watchWorkflowPods(ctx)
if err != nil {
log.Errorf("Failed to register watch for Workflow resource: %v", err)
return err
}
for {
select {
case wf := <-wfc.wfUpdates:
log.Infof("Processing wf: %v", wf.ObjectMeta.SelfLink)
wfc.operateWorkflow(wf)
case pod := <-wfc.podUpdates:
if pod.Status.Phase != "Succeeded" && pod.Status.Phase != "Failed" {
continue
}
log.Infof("Processing completed pod: %v", pod.ObjectMeta.SelfLink)
workflowName, ok := pod.Labels[common.LabelKeyWorkflow]
if !ok {
continue
}
wf, err := wfc.WorkflowClient.GetWorkflow(workflowName)
if err != nil {
log.Warnf("Failed to find workflow %s %+v", workflowName, err)
continue
}
node, ok := wf.Status.Nodes[pod.Name]
if !ok {
log.Warnf("pod %s unassociated with workflow %s", pod.Name, workflowName)
continue
}
if string(pod.Status.Phase) == node.Status {
log.Infof("pod %s already marked %s", pod.Name, node.Status)
continue
}
log.Infof("Updating pod %s status %s -> %s", pod.Name, node.Status, pod.Status.Phase)
node.Status = string(pod.Status.Phase)
wf.Status.Nodes[pod.Name] = node
_, err = wfc.WorkflowClient.UpdateWorkflow(wf)
if err != nil {
log.Infof("Failed to update %s status: %+v", pod.Name, err)
}
log.Infof("Updated %v", wf.Status.Nodes)
}
}
<-ctx.Done()
return ctx.Err()
}
// ResyncConfig reloads the controller config from the configmap
func (wfc *WorkflowController) ResyncConfig() error {
cmClient := wfc.clientset.CoreV1().ConfigMaps(apiv1.NamespaceDefault)
cm, err := cmClient.Get(wfc.ConfigMap, metav1.GetOptions{})
if err != nil {
return errors.InternalWrapError(err)
}
configStr, ok := cm.Data[common.WorkflowControllerConfigMapKey]
if !ok {
return errors.Errorf(errors.CodeBadRequest, "ConfigMap '%s' does not have key '%s'", wfc.ConfigMap, common.WorkflowControllerConfigMapKey)
}
var config WorkflowControllerConfig
err = yaml.Unmarshal([]byte(configStr), &config)
if err != nil {
return errors.InternalWrapError(err)
}
log.Printf("workflow controller configuration from %s:\n%s", wfc.ConfigMap, configStr)
if config.ArtifactRepository.S3 != nil {
err = wfc.validateS3Repository(*config.ArtifactRepository.S3)
if err != nil {
return err
}
}
wfc.Config = config
if wfc.Config.ExecutorImage == "" {
wfc.Config.ExecutorImage = "argoproj/argoexec:" + argo.Version
}
return nil
}
func (wfc *WorkflowController) validateS3Repository(s3repo S3ArtifactRepository) error {
secClient := wfc.clientset.CoreV1().Secrets(apiv1.NamespaceDefault)
for _, secSelector := range []apiv1.SecretKeySelector{s3repo.AccessKeySecret, s3repo.SecretKeySecret} {
s3bucketSecret, err := secClient.Get(secSelector.Name, metav1.GetOptions{})
if err != nil {
return errors.InternalWrapError(err)
}
secBytes := s3bucketSecret.Data[secSelector.Key]
if len(secBytes) == 0 {
return errors.Errorf(errors.CodeBadRequest, "secret '%s' key '%s' empty", secSelector.LocalObjectReference, secSelector.Key)
}
}
return nil
}
func (wfc *WorkflowController) watchWorkflows(ctx context.Context) (cache.Controller, error) {
source := wfc.WorkflowClient.NewListWatch()
_, controller := cache.NewInformer(
source,
// The object type.
&wfv1.Workflow{},
// resyncPeriod
// Every resyncPeriod, all resources in the cache will retrigger events.
// Set to 0 to disable the resync.
0,
// Your custom resource event handlers.
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
wf := obj.(*wfv1.Workflow)
log.Infof("[CONTROLLER] WF Add %s", wf.ObjectMeta.SelfLink)
wfc.wfUpdates <- wf
},
UpdateFunc: func(old, new interface{}) {
//oldWf := old.(*wfv1.Workflow)
newWf := new.(*wfv1.Workflow)
log.Infof("[CONTROLLER] WF Update %s", newWf.ObjectMeta.SelfLink)
wfc.wfUpdates <- newWf
},
DeleteFunc: func(obj interface{}) {
wf := obj.(*wfv1.Workflow)
log.Infof("[CONTROLLER] WF Delete %s", wf.ObjectMeta.SelfLink)
wfc.wfUpdates <- wf
},
})
go controller.Run(ctx.Done())
return controller, nil
}
func (wfc *WorkflowController) watchWorkflowPods(ctx context.Context) (cache.Controller, error) {
source := cache.NewListWatchFromClient(
wfc.clientset.Core().RESTClient(),
"pods",
apiv1.NamespaceDefault,
fields.Everything(),
)
_, controller := cache.NewInformer(
source,
// The object type.
&apiv1.Pod{},
// resyncPeriod
// Every resyncPeriod, all resources in the cache will retrigger events.
// Set to 0 to disable the resync.
0,
// Your custom resource event handlers.
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
pod := obj.(*apiv1.Pod)
log.Infof("[CONTROLLER] Pod Added%s", pod.ObjectMeta.SelfLink)
wfc.podUpdates <- pod
},
UpdateFunc: func(old, new interface{}) {
//oldPod := old.(*apiv1.Pod)
newPod := new.(*apiv1.Pod)
log.Infof("[CONTROLLER] Pod Updated %s", newPod.ObjectMeta.SelfLink)
wfc.podUpdates <- newPod
},
DeleteFunc: func(obj interface{}) {
pod := obj.(*apiv1.Pod)
log.Infof("[CONTROLLER] Pod Deleted%s", pod.ObjectMeta.SelfLink)
wfc.podUpdates <- pod
},
})
go controller.Run(ctx.Done())
return controller, nil
}