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deployment.go
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deployment.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 kubernetes
import (
"fmt"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
"strings"
"github.com/Masterminds/semver"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
)
// ValidDeploymentContainerImageVersion validates compliance of a deployment container image to a minimum version
func ValidDeploymentContainerImageVersion(deploymentToCheck *appsv1.Deployment, containerName, minimumVersion string) (bool, error) {
containers := deploymentToCheck.Spec.Template.Spec.Containers
getContainer := func(container string) (*corev1.Container, error) {
for _, container := range containers {
if container.Name == containerName {
return &container, nil
}
}
return nil, fmt.Errorf("container %q does not belong to this deployment", container)
}
containerToCheck, err := getContainer(containerName)
if err != nil {
return false, err
}
actualVersion, err := semver.NewVersion(strings.Split(containerToCheck.Image, ":")[1])
if err != nil {
return false, err
}
minVersion, err := semver.NewVersion(minimumVersion)
if err != nil {
return false, err
}
if actualVersion.LessThan(minVersion) {
return false, nil
}
return true, nil
}
// DeploymentSource is a function that produces a slice of Deployments or an error.
type DeploymentSource func() ([]*appsv1.Deployment, error)
// DeploymentLister is a lister of Deployments.
type DeploymentLister interface {
// List lists all Deployments that match the given selector.
List(selector labels.Selector) ([]*appsv1.Deployment, error)
// Deployments yields a DeploymentNamespaceLister for the given namespace.
Deployments(namespace string) DeploymentNamespaceLister
}
// DeploymentNamespaceLister is a lister of deployments for a specific namespace.
type DeploymentNamespaceLister interface {
// List lists all Deployments that match the given selector in the current namespace.
List(selector labels.Selector) ([]*appsv1.Deployment, error)
// Get retrieves the Deployment with the given name in the current namespace.
Get(name string) (*appsv1.Deployment, error)
}
type deploymentLister struct {
source DeploymentSource
}
type deploymentNamespaceLister struct {
source DeploymentSource
namespace string
}
// NewDeploymentLister creates a new DeploymentLister from the given DeploymentSource.
func NewDeploymentLister(source DeploymentSource) DeploymentLister {
return &deploymentLister{source: source}
}
func filterDeployments(source DeploymentSource, filter func(*appsv1.Deployment) bool) ([]*appsv1.Deployment, error) {
deployments, err := source()
if err != nil {
return nil, err
}
var out []*appsv1.Deployment
for _, deployment := range deployments {
if filter(deployment) {
out = append(out, deployment)
}
}
return out, nil
}
func (d *deploymentLister) List(selector labels.Selector) ([]*appsv1.Deployment, error) {
return filterDeployments(d.source, func(deployment *appsv1.Deployment) bool {
return selector.Matches(labels.Set(deployment.Labels))
})
}
func (d *deploymentLister) Deployments(namespace string) DeploymentNamespaceLister {
return &deploymentNamespaceLister{
source: d.source,
namespace: namespace,
}
}
func (d *deploymentNamespaceLister) Get(name string) (*appsv1.Deployment, error) {
deployments, err := filterDeployments(d.source, func(deployment *appsv1.Deployment) bool {
return deployment.Namespace == d.namespace && deployment.Name == name
})
if err != nil {
return nil, err
}
if len(deployments) == 0 {
return nil, apierrors.NewNotFound(appsv1.Resource("Deployments"), name)
}
return deployments[0], nil
}
func (d *deploymentNamespaceLister) List(selector labels.Selector) ([]*appsv1.Deployment, error) {
return filterDeployments(d.source, func(deployment *appsv1.Deployment) bool {
return deployment.Namespace == d.namespace && selector.Matches(labels.Set(deployment.Labels))
})
}