Do not create roles if cluster is masterless

fix pod deletion

pkg/cluster/cluster.go

@@ -56,12 +56,14 @@ type Cluster struct {
 	kubeResources
 	spec.Postgresql
 	Config
-	logger         *logrus.Entry
-	pgUsers        map[string]spec.PgUser
-	podEvents      chan spec.PodEvent
-	podSubscribers map[spec.NamespacedName]chan spec.PodEvent
-	pgDb           *sql.DB
-	mu             sync.Mutex
+	logger               *logrus.Entry
+	pgUsers              map[string]spec.PgUser
+	podEvents            chan spec.PodEvent
+	podSubscribers       map[spec.NamespacedName]chan spec.PodEvent
+	pgDb                 *sql.DB
+	mu                   sync.Mutex
+	masterLess           bool
+	podDispatcherRunning bool
 }
 
 func New(cfg Config, pgSpec spec.Postgresql, logger *logrus.Logger) *Cluster {
@@ -69,13 +71,15 @@ func New(cfg Config, pgSpec spec.Postgresql, logger *logrus.Logger) *Cluster {
 	kubeResources := kubeResources{Secrets: make(map[types.UID]*v1.Secret)}
 
 	cluster := &Cluster{
-		Config:         cfg,
-		Postgresql:     pgSpec,
-		logger:         lg,
-		pgUsers:        make(map[string]spec.PgUser),
-		podEvents:      make(chan spec.PodEvent),
-		podSubscribers: make(map[spec.NamespacedName]chan spec.PodEvent),
-		kubeResources:  kubeResources,
+		Config:               cfg,
+		Postgresql:           pgSpec,
+		logger:               lg,
+		pgUsers:              make(map[string]spec.PgUser),
+		podEvents:            make(chan spec.PodEvent),
+		podSubscribers:       make(map[spec.NamespacedName]chan spec.PodEvent),
+		kubeResources:        kubeResources,
+		masterLess:           false,
+		podDispatcherRunning: false,
 	}
 
 	return cluster
@@ -90,12 +94,6 @@ func (c *Cluster) TeamName() string {
 	return c.Spec.TeamId
 }
 
-func (c *Cluster) Run(stopCh <-chan struct{}) {
-	go c.podEventsDispatcher(stopCh)
-
-	<-stopCh
-}
-
 func (c *Cluster) SetStatus(status spec.PostgresStatus) {
 	c.Status = status
 	b, err := json.Marshal(status)
@@ -155,7 +153,12 @@ func (c *Cluster) etcdKeyExists(keyName string) (bool, error) {
 	return resp != nil, err
 }
 
-func (c *Cluster) Create() error {
+func (c *Cluster) Create(stopCh <-chan struct{}) error {
+	if !c.podDispatcherRunning {
+		go c.podEventsDispatcher(stopCh)
+		c.podDispatcherRunning = true
+	}
+
 	keyExist, err := c.etcdKeyExists(fmt.Sprintf("/%s/%s", c.OpConfig.EtcdScope, c.Metadata.Name))
 	if err != nil {
 		c.logger.Warnf("Can't check etcd key: %s", err)
@@ -203,14 +206,18 @@ func (c *Cluster) Create() error {
 		return err
 	}
 
-	if err := c.initDbConn(); err != nil {
-		return fmt.Errorf("Can't init db connection: %s", err)
-	}
+	if !c.masterLess {
+		if err := c.initDbConn(); err != nil {
+			return fmt.Errorf("Can't init db connection: %s", err)
+		}
 
-	if err := c.createUsers(); err != nil {
-		return fmt.Errorf("Can't create users: %s", err)
+		if err := c.createUsers(); err != nil {
+			return fmt.Errorf("Can't create users: %s", err)
+		} else {
+			c.logger.Infof("Users have been successfully created")
+		}
 	} else {
-		c.logger.Infof("Users have been successfully created")
+		c.logger.Warnln("Cluster is masterless")
 	}
 
 	c.ListResources()

pkg/cluster/pod.go

@@ -45,11 +45,13 @@ func (c *Cluster) deletePods() error {
 	}
 
 	for _, obj := range pods {
-		c.logger.Debugf("Deleting Pod '%s'", util.NameFromMeta(obj.ObjectMeta))
-		if err := c.deletePod(&obj); err != nil {
-			c.logger.Errorf("Can't delete Pod: %s", err)
+		podName := util.NameFromMeta(obj.ObjectMeta)
+
+		c.logger.Debugf("Deleting Pod '%s'", podName)
+		if err := c.deletePod(podName); err != nil {
+			c.logger.Errorf("Can't delete Pod '%s': %s", podName, err)
 		} else {
-			c.logger.Infof("Pod '%s' has been deleted", util.NameFromMeta(obj.ObjectMeta))
+			c.logger.Infof("Pod '%s' has been deleted", podName)
 		}
 	}
 	if len(pods) > 0 {
@@ -83,9 +85,7 @@ func (c *Cluster) deletePersistenVolumeClaims() error {
 	return nil
 }
 
-func (c *Cluster) deletePod(pod *v1.Pod) error {
-	podName := util.NameFromMeta(pod.ObjectMeta)
-
+func (c *Cluster) deletePod(podName spec.NamespacedName) error {
 	ch := make(chan spec.PodEvent)
 	if _, ok := c.podSubscribers[podName]; ok {
 		panic("Pod '" + podName.String() + "' is already subscribed")
@@ -96,7 +96,7 @@ func (c *Cluster) deletePod(pod *v1.Pod) error {
 		delete(c.podSubscribers, podName)
 	}()
 
-	if err := c.KubeClient.Pods(pod.Namespace).Delete(pod.Name, deleteOptions); err != nil {
+	if err := c.KubeClient.Pods(podName.Namespace).Delete(podName.Name, deleteOptions); err != nil {
 		return err
 	}
 

pkg/cluster/sync.go

@@ -6,7 +6,11 @@ import (
 	"github.bus.zalan.do/acid/postgres-operator/pkg/util"
 )
 
-func (c *Cluster) SyncCluster() {
+func (c *Cluster) SyncCluster(stopCh <-chan struct{}) {
+	if !c.podDispatcherRunning {
+		go c.podEventsDispatcher(stopCh)
+	}
+
 	c.logger.Debugf("Syncing Secrets")
 	if err := c.syncSecrets(); err != nil {
 		c.logger.Infof("Can't sync Secrets: %s", err)

pkg/cluster/util.go

@@ -171,7 +171,7 @@ func (c *Cluster) waitPodLabelsReady() error {
 	}
 	podsNumber := len(pods.Items)
 
-	return retryutil.Retry(c.OpConfig.ResourceCheckInterval, c.OpConfig.ResourceCheckTimeout,
+	err = retryutil.Retry(c.OpConfig.ResourceCheckInterval, c.OpConfig.ResourceCheckTimeout,
 		func() (bool, error) {
 			masterPods, err := c.KubeClient.Pods(namespace).List(masterListOption)
 			if err != nil {
@@ -185,11 +185,20 @@ func (c *Cluster) waitPodLabelsReady() error {
 				return false, fmt.Errorf("Too many masters")
 			}
 			if len(replicaPods.Items) == podsNumber {
-				return false, fmt.Errorf("Cluster has no master")
+				c.masterLess = true
+				return true, nil
 			}
 
 			return len(masterPods.Items)+len(replicaPods.Items) == podsNumber, nil
 		})
+
+	//TODO: wait for master for a while and then set masterLess flag
+
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 func (c *Cluster) waitStatefulsetPodsReady() error {

pkg/controller/postgresql.go

@@ -48,10 +48,8 @@ func (c *Controller) clusterListFunc(options api.ListOptions) (runtime.Object, e
 		c.stopChMap[clusterName] = stopCh
 		c.clusters[clusterName] = cl
 		cl.LoadResources()
-		go cl.Run(stopCh)
-
 		cl.ListResources()
-		cl.SyncCluster()
+		cl.SyncCluster(stopCh)
 	}
 	if len(c.clusters) > 0 {
 		c.logger.Infof("There are %d clusters currently running", len(c.clusters))
@@ -95,13 +93,12 @@ func (c *Controller) postgresqlAdd(obj interface{}) {
 	c.stopChMap[clusterName] = stopCh
 
 	cl.SetStatus(spec.ClusterStatusCreating)
-	if err := cl.Create(); err != nil {
+	if err := cl.Create(stopCh); err != nil {
 		c.logger.Errorf("Can't create cluster: %s", err)
 		cl.SetStatus(spec.ClusterStatusAddFailed)
 		return
 	}
 	cl.SetStatus(spec.ClusterStatusRunning) //TODO: are you sure it's running?
-	go cl.Run(stopCh)
 
 	c.logger.Infof("Postgresql cluster '%s' has been created", clusterName)
 }