my-rook-config/pkg/operator/k8sutil/deployment.go

/*
Copyright 2018 The Rook Authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package k8sutil

import (
	"fmt"
	"strings"
	"time"

	"github.com/rook/rook/pkg/clusterd"
	extensions "k8s.io/api/extensions/v1beta1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/kubernetes"
)

// GetDeploymentVersion returns the version of the image running in the pod spec for the desired container
func GetDeploymentVersion(clientset kubernetes.Interface, namespace, name, container string) (string, error) {
	d, err := clientset.Extensions().Deployments(namespace).Get(name, metav1.GetOptions{})
	if err != nil {
		return "", fmt.Errorf("failed to find deployment %s. %v", name, err)
	}
	return GetDeploymentSpecVersion(clientset, *d, container)
}

func GetDeploymentSpecVersion(clientset kubernetes.Interface, d extensions.Deployment, container string) (string, error) {
	image, err := GetSpecContainerImage(d.Spec.Template.Spec, container)
	if err != nil {
		return "", err
	}

	parts := strings.Split(image, ":")
	if len(parts) != 2 {
		return "", fmt.Errorf("unexpected version in image: %s", image)
	}

	return parts[1], nil
}

func WaitForDeploymentVersion(clientset kubernetes.Interface, namespace, label, container, desiredVersion string) error {

	sleepTime := 3
	attempts := 30
	for i := 0; i < attempts; i++ {
		deployments, err := clientset.Extensions().Deployments(namespace).List(metav1.ListOptions{LabelSelector: label})
		if err != nil {
			return fmt.Errorf("failed to list deployments with label %s. %v", label, err)
		}

		matches := 0
		for _, d := range deployments.Items {
			version, err := GetDeploymentSpecVersion(clientset, d, container)
			if err != nil {
				logger.Infof("failed to get version for deployment %s. %+v", d.Name, err)
				continue
			}
			if version == desiredVersion {
				matches++
			}
		}

		if matches == len(deployments.Items) && matches > 0 {
			logger.Infof("all %d %s deployments are on version %s", matches, container, desiredVersion)
			break
		}

		if len(deployments.Items) == 0 {
			logger.Infof("waiting for at least one deployment to start to see the version")
		} else {
			logger.Infof("%d/%d %s deployments match version %s", matches, len(deployments.Items), container, desiredVersion)
		}
		time.Sleep(time.Duration(sleepTime) * time.Second)
	}
	return nil
}

func UpdateDeploymentAndWait(context *clusterd.Context, deployment *extensions.Deployment, namespace string) error {
	original, err := context.Clientset.Extensions().Deployments(namespace).Get(deployment.Name, metav1.GetOptions{})
	if err != nil {
		return fmt.Errorf("failed to get deployment %s. %+v", deployment.Name, err)
	}

	logger.Infof("updating deployment %s", deployment.Name)
	if _, err := context.Clientset.Extensions().Deployments(namespace).Update(deployment); err != nil {
		return fmt.Errorf("failed to update deployment %s. %+v", deployment.Name, err)
	}

	// wait for the deployment to be restarted
	sleepTime := 2
	attempts := 30
	if original.Spec.ProgressDeadlineSeconds != nil {
		// make the attempts double the progress deadline since the pod is both stopping and starting
		attempts = 2 * (int(*original.Spec.ProgressDeadlineSeconds) / sleepTime)
	}
	for i := 0; i < attempts; i++ {
		// check for the status of the deployment
		d, err := context.Clientset.Extensions().Deployments(namespace).Get(deployment.Name, metav1.GetOptions{})
		if err != nil {
			return fmt.Errorf("failed to get deployment %s. %+v", deployment.Name, err)
		}
		if d.Status.ObservedGeneration != original.Status.ObservedGeneration && d.Status.UpdatedReplicas > 0 && d.Status.ReadyReplicas > 0 {
			logger.Infof("finished waiting for updated deployment %s", d.Name)
			return nil
		}

		logger.Debugf("deployment %s status=%v", d.Name, d.Status)
		time.Sleep(time.Duration(sleepTime) * time.Second)
	}

	return fmt.Errorf("gave up waiting for deployment %s to update", deployment.Name)
}

// GetDeployments returns a list of deployment names labels matching a given selector
// example of a label selector might be "app=rook-ceph-mon, mon!=b"
// more: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
func GetDeployments(clientset kubernetes.Interface, namespace, labelSelector string) (*extensions.DeploymentList, error) {
	listOptions := metav1.ListOptions{LabelSelector: labelSelector}
	deployments, err := clientset.Extensions().Deployments(namespace).List(listOptions)
	if err != nil {
		return nil, fmt.Errorf("failed to list deployments with labelSelector %s: %v", labelSelector, err)
	}
	return deployments, nil
}