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controller.go
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controller.go
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// Copyright 2019 FairwindsOps Inc
//
// 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 validator
import (
conf "github.com/fairwindsops/polaris/pkg/config"
"github.com/fairwindsops/polaris/pkg/kube"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
)
// ControllerSpec is a generic type for k8s controller specs
type ControllerSpec struct {
Template corev1.PodTemplateSpec
}
// Controller is a generic type for k8s controllers (e.g. Deployments and StatefulSets)
type Controller struct {
Type string
Name string
Namespace string
Spec ControllerSpec
}
// ValidateController validates a single controller, returns a ControllerResult.
func ValidateController(conf conf.Configuration, controller Controller) ControllerResult {
pod := controller.Spec.Template.Spec
podResult := ValidatePod(conf, &pod)
return ControllerResult{
Type: controller.Type,
Name: controller.Name,
PodResult: podResult,
}
}
// ValidateControllers validates that each deployment conforms to the Polaris config,
// returns a list of ResourceResults organized by namespace.
func ValidateControllers(config conf.Configuration, kubeResources *kube.ResourceProvider, nsResults *NamespacedResults) {
controllers := []Controller{}
for _, deploy := range kubeResources.Deployments {
controllers = append(controllers, ControllerFromDeployment(deploy))
}
for _, deploy := range kubeResources.StatefulSets {
controllers = append(controllers, ControllerFromStatefulSet(deploy))
}
for _, controller := range controllers {
controllerResult := ValidateController(config, controller)
nsResult := nsResults.getNamespaceResult(controller.Namespace)
nsResult.Summary.appendResults(*controllerResult.PodResult.Summary)
if controller.Type == "Deployment" {
nsResult.DeploymentResults = append(nsResult.DeploymentResults, controllerResult)
} else if controller.Type == "StatefulSet" {
nsResult.StatefulSetResults = append(nsResult.StatefulSetResults, controllerResult)
}
}
}
// ControllerFrom* functions are 100% boilerplate
// ControllerFromDeployment creates a controller
func ControllerFromDeployment(c appsv1.Deployment) Controller {
spec := ControllerSpec{
Template: c.Spec.Template,
}
return Controller{
Type: "Deployment",
Name: c.Name,
Namespace: c.Namespace,
Spec: spec,
}
}
// ControllerFromStatefulSet creates a controller
func ControllerFromStatefulSet(c appsv1.StatefulSet) Controller {
spec := ControllerSpec{
Template: c.Spec.Template,
}
return Controller{
Type: "StatefulSet",
Name: c.Name,
Namespace: c.Namespace,
Spec: spec,
}
}