Pod Rolling update

introduce Pod events channel;
add parsing of the MaintenanceWindows section;
skip deleting Etcd key on cluster delete;
use external etcd host;
watch for tpr/pods in the namespace of the operator pod only;

pkg/controller/util.go

@@ -0,0 +1,57 @@
+package controller
+
+import (
+	"fmt"
+
+	"github.bus.zalan.do/acid/postgres-operator/pkg/cluster"
+	"github.bus.zalan.do/acid/postgres-operator/pkg/util/constants"
+	"github.bus.zalan.do/acid/postgres-operator/pkg/util/k8sutil"
+	"github.bus.zalan.do/acid/postgres-operator/pkg/util/resources"
+	"k8s.io/client-go/pkg/api"
+)
+
+func (c *Controller) makeClusterConfig() cluster.Config {
+	return cluster.Config{
+		ControllerNamespace: c.config.PodNamespace,
+		KubeClient:          c.config.KubeClient,
+		RestClient:          c.config.RestClient,
+		EtcdClient:          c.config.EtcdClient,
+		TeamsAPIClient:      c.config.TeamsAPIClient,
+	}
+}
+
+func (c *Controller) getOAuthToken() (string, error) {
+	// Temporary getting postgresql-operator secret from the NamespaceDefault
+	credentialsSecret, err := c.config.KubeClient.Secrets(api.NamespaceDefault).Get(constants.OAuthTokenSecretName)
+
+	if err != nil {
+		return "", fmt.Errorf("Can't get credentials secret: %s", err)
+	}
+	data := credentialsSecret.Data
+
+	if string(data["read-only-token-type"]) != "Bearer" {
+		return "", fmt.Errorf("Wrong token type: %s", data["read-only-token-type"])
+	}
+
+	return string(data["read-only-token-secret"]), nil
+}
+
+func (c *Controller) createTPR() error {
+	TPRName := fmt.Sprintf("%s.%s", constants.TPRName, constants.TPRVendor)
+	tpr := resources.ThirdPartyResource(TPRName)
+
+	_, err := c.config.KubeClient.ExtensionsV1beta1().ThirdPartyResources().Create(tpr)
+	if err != nil {
+		if !k8sutil.ResourceAlreadyExists(err) {
+			return err
+		} else {
+			c.logger.Infof("ThirdPartyResource '%s' is already registered", TPRName)
+		}
+	} else {
+		c.logger.Infof("ThirdPartyResource '%s' has been registered", TPRName)
+	}
+
+	restClient := c.config.RestClient
+
+	return k8sutil.WaitTPRReady(restClient, constants.TPRReadyWaitInterval, constants.TPRReadyWaitTimeout, c.config.PodNamespace)
+}