seaweedfs-operator/controllers/controller_util.go

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package controllers
import (
"context"
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"encoding/json"
"fmt"
seaweedv1 "github.com/seaweedfs/seaweedfs-operator/api/v1"
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appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes/scheme"
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"k8s.io/klog"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// svcName is the backend service name
func createIngress(seaweedCR *seaweedv1.Seaweed, svcName string, port int) *extensionsv1beta1.Ingress {
ingressLabel := map[string]string{"app": "seaweedfs", "role": "ingress", "name": svcName}
ingress := &extensionsv1beta1.Ingress{
ObjectMeta: metav1.ObjectMeta{
Name: svcName + "-ingress",
Namespace: seaweedCR.Namespace,
Labels: ingressLabel,
},
Spec: extensionsv1beta1.IngressSpec{
Rules: []extensionsv1beta1.IngressRule{},
},
}
for _, host := range seaweedCR.Spec.Hosts {
rule := extensionsv1beta1.IngressRule{
Host: host,
IngressRuleValue: extensionsv1beta1.IngressRuleValue{
HTTP: &extensionsv1beta1.HTTPIngressRuleValue{
Paths: []extensionsv1beta1.HTTPIngressPath{
{
Path: "/",
Backend: extensionsv1beta1.IngressBackend{
ServiceName: svcName,
ServicePort: intstr.FromInt(port),
},
},
},
},
},
}
ingress.Spec.Rules = append(ingress.Spec.Rules, rule)
}
return ingress
}
// the following is adapted from tidb-operator/pkg/controller/generic_control.go
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const (
// LastAppliedPodTemplate is annotation key of the last applied pod template
LastAppliedPodTemplate = "seaweedfs.com/last-applied-podtemplate"
// LastAppliedConfigAnnotation is annotation key of last applied configuration
LastAppliedConfigAnnotation = "seaweedfs.com/last-applied-configuration"
)
type MergeFn func(existing, desired runtime.Object) error
// CreateOrUpdate create an object to the Kubernetes cluster for controller, if the object to create is existed,
// call mergeFn to merge the change in new object to the existing object, then update the existing object.
// The object will also be adopted by the given controller.
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func (r *SeaweedReconciler) CreateOrUpdate(obj runtime.Object, mergeFn MergeFn) (runtime.Object, error) {
// controller-runtime/client will mutate the object pointer in-place,
// to be consistent with other methods in our controller, we copy the object
// to avoid the in-place mutation here and hereafter.
desired := obj.DeepCopyObject()
// 1. try to create and see if there is any conflicts
err := r.Create(context.TODO(), desired)
if errors.IsAlreadyExists(err) {
// 2. object has already existed, merge our desired changes to it
existing, err := EmptyClone(obj)
if err != nil {
return nil, err
}
key, err := client.ObjectKeyFromObject(existing)
if err != nil {
return nil, err
}
err = r.Get(context.TODO(), key, existing)
if err != nil {
return nil, err
}
mutated := existing.DeepCopyObject()
// 4. invoke mergeFn to mutate a copy of the existing object
if err := mergeFn(mutated, desired); err != nil {
return nil, err
}
// 5. check if the copy is actually mutated
if !apiequality.Semantic.DeepEqual(existing, mutated) {
err := r.Update(context.TODO(), mutated)
return mutated, err
}
return mutated, nil
}
return desired, err
}
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func (r *SeaweedReconciler) addSpecToAnnotation(d *appsv1.Deployment) error {
b, err := json.Marshal(d.Spec.Template.Spec)
if err != nil {
return err
}
if d.Annotations == nil {
d.Annotations = map[string]string{}
}
d.Annotations[LastAppliedPodTemplate] = string(b)
return nil
}
func (r *SeaweedReconciler) CreateOrUpdateDeployment(deploy *appsv1.Deployment) (*appsv1.Deployment, error) {
r.addSpecToAnnotation(deploy)
result, err := r.CreateOrUpdate(deploy, func(existing, desired runtime.Object) error {
existingDep := existing.(*appsv1.Deployment)
desiredDep := desired.(*appsv1.Deployment)
existingDep.Spec.Replicas = desiredDep.Spec.Replicas
existingDep.Labels = desiredDep.Labels
if existingDep.Annotations == nil {
existingDep.Annotations = map[string]string{}
}
for k, v := range desiredDep.Annotations {
existingDep.Annotations[k] = v
}
// only override the default strategy if it is explicitly set in the desiredDep
if string(desiredDep.Spec.Strategy.Type) != "" {
existingDep.Spec.Strategy.Type = desiredDep.Spec.Strategy.Type
if existingDep.Spec.Strategy.RollingUpdate != nil {
existingDep.Spec.Strategy.RollingUpdate = desiredDep.Spec.Strategy.RollingUpdate
}
}
// pod selector of deployment is immutable, so we don't mutate the labels of pod
for k, v := range desiredDep.Spec.Template.Annotations {
existingDep.Spec.Template.Annotations[k] = v
}
// podSpec of deployment is hard to merge, use an annotation to assist
if DeploymentPodSpecChanged(desiredDep, existingDep) {
// Record last applied spec in favor of future equality check
b, err := json.Marshal(desiredDep.Spec.Template.Spec)
if err != nil {
return err
}
existingDep.Annotations[LastAppliedConfigAnnotation] = string(b)
existingDep.Spec.Template.Spec = desiredDep.Spec.Template.Spec
}
return nil
})
if err != nil {
return nil, err
}
return result.(*appsv1.Deployment), err
}
func (r *SeaweedReconciler) CreateOrUpdateService(svc *corev1.Service) (*corev1.Service, error) {
result, err := r.CreateOrUpdate(svc, func(existing, desired runtime.Object) error {
existingSvc := existing.(*corev1.Service)
desiredSvc := desired.(*corev1.Service)
if existingSvc.Annotations == nil {
existingSvc.Annotations = map[string]string{}
}
for k, v := range desiredSvc.Annotations {
existingSvc.Annotations[k] = v
}
existingSvc.Labels = desiredSvc.Labels
equal, err := ServiceEqual(desiredSvc, existingSvc)
if err != nil {
return err
}
if !equal {
// record desiredSvc Spec in annotations in favor of future equality checks
b, err := json.Marshal(desiredSvc.Spec)
if err != nil {
return err
}
existingSvc.Annotations[LastAppliedConfigAnnotation] = string(b)
clusterIp := existingSvc.Spec.ClusterIP
ports := existingSvc.Spec.Ports
serviceType := existingSvc.Spec.Type
existingSvc.Spec = desiredSvc.Spec
existingSvc.Spec.ClusterIP = clusterIp
// If the existed service and the desired service is NodePort or LoadBalancerType, we should keep the nodePort unchanged.
if (serviceType == corev1.ServiceTypeNodePort || serviceType == corev1.ServiceTypeLoadBalancer) &&
(desiredSvc.Spec.Type == corev1.ServiceTypeNodePort || desiredSvc.Spec.Type == corev1.ServiceTypeLoadBalancer) {
for i, dport := range existingSvc.Spec.Ports {
for _, eport := range ports {
// Because the portName could be edited,
// we use Port number to link the desired Service Port and the existed Service Port in the nested loop
if dport.Port == eport.Port && dport.Protocol == eport.Protocol {
dport.NodePort = eport.NodePort
existingSvc.Spec.Ports[i] = dport
break
}
}
}
}
}
return nil
})
if err != nil {
return nil, err
}
return result.(*corev1.Service), nil
}
func (r *SeaweedReconciler) CreateOrUpdateIngress(ingress *extensionsv1beta1.Ingress) (*extensionsv1beta1.Ingress, error) {
result, err := r.CreateOrUpdate(ingress, func(existing, desired runtime.Object) error {
existingIngress := existing.(*extensionsv1beta1.Ingress)
desiredIngress := desired.(*extensionsv1beta1.Ingress)
if existingIngress.Annotations == nil {
existingIngress.Annotations = map[string]string{}
}
for k, v := range desiredIngress.Annotations {
existingIngress.Annotations[k] = v
}
existingIngress.Labels = desiredIngress.Labels
equal, err := IngressEqual(desiredIngress, existingIngress)
if err != nil {
return err
}
if !equal {
// record desiredIngress Spec in annotations in favor of future equality checks
b, err := json.Marshal(desiredIngress.Spec)
if err != nil {
return err
}
existingIngress.Annotations[LastAppliedConfigAnnotation] = string(b)
existingIngress.Spec = desiredIngress.Spec
}
return nil
})
if err != nil {
return nil, err
}
return result.(*extensionsv1beta1.Ingress), nil
}
// EmptyClone create an clone of the resource with the same name and namespace (if namespace-scoped), with other fields unset
func EmptyClone(obj runtime.Object) (runtime.Object, error) {
meta, ok := obj.(metav1.Object)
if !ok {
return nil, fmt.Errorf("Obj %v is not a metav1.Object, cannot call EmptyClone", obj)
}
gvk, err := InferObjectKind(obj)
if err != nil {
return nil, err
}
inst, err := scheme.Scheme.New(gvk)
if err != nil {
return nil, err
}
instMeta, ok := inst.(metav1.Object)
if !ok {
return nil, fmt.Errorf("New instatnce %v created from scheme is not a metav1.Object, EmptyClone failed", inst)
}
instMeta.SetName(meta.GetName())
instMeta.SetNamespace(meta.GetNamespace())
return inst, nil
}
// InferObjectKind infers the object kind
func InferObjectKind(obj runtime.Object) (schema.GroupVersionKind, error) {
gvks, _, err := scheme.Scheme.ObjectKinds(obj)
if err != nil {
return schema.GroupVersionKind{}, err
}
if len(gvks) != 1 {
return schema.GroupVersionKind{}, fmt.Errorf("Object %v has ambigious GVK", obj)
}
return gvks[0], nil
}
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// GetDeploymentLastAppliedPodTemplate set last applied pod template from Deployment's annotation
func GetDeploymentLastAppliedPodTemplate(dep *appsv1.Deployment) (*corev1.PodSpec, error) {
applied, ok := dep.Annotations[LastAppliedPodTemplate]
if !ok {
return nil, fmt.Errorf("deployment:[%s/%s] not found spec's apply config", dep.GetNamespace(), dep.GetName())
}
podSpec := &corev1.PodSpec{}
err := json.Unmarshal([]byte(applied), podSpec)
if err != nil {
return nil, err
}
return podSpec, nil
}
// DeploymentPodSpecChanged checks whether the new deployment differs with the old one's last-applied-config
func DeploymentPodSpecChanged(newDep *appsv1.Deployment, oldDep *appsv1.Deployment) bool {
lastAppliedPodTemplate, err := GetDeploymentLastAppliedPodTemplate(oldDep)
if err != nil {
klog.Warningf("error get last-applied-config of deployment %s/%s: %v", oldDep.Namespace, oldDep.Name, err)
return true
}
return !apiequality.Semantic.DeepEqual(newDep.Spec.Template.Spec, lastAppliedPodTemplate)
}
// ServiceEqual compares the new Service's spec with old Service's last applied config
func ServiceEqual(newSvc, oldSvc *corev1.Service) (bool, error) {
oldSpec := corev1.ServiceSpec{}
if lastAppliedConfig, ok := oldSvc.Annotations[LastAppliedConfigAnnotation]; ok {
err := json.Unmarshal([]byte(lastAppliedConfig), &oldSpec)
if err != nil {
klog.Errorf("unmarshal ServiceSpec: [%s/%s]'s applied config failed,error: %v", oldSvc.GetNamespace(), oldSvc.GetName(), err)
return false, err
}
return apiequality.Semantic.DeepEqual(oldSpec, newSvc.Spec), nil
}
return false, nil
}
func IngressEqual(newIngress, oldIngres *extensionsv1beta1.Ingress) (bool, error) {
oldIngressSpec := extensionsv1beta1.IngressSpec{}
if lastAppliedConfig, ok := oldIngres.Annotations[LastAppliedConfigAnnotation]; ok {
err := json.Unmarshal([]byte(lastAppliedConfig), &oldIngressSpec)
if err != nil {
klog.Errorf("unmarshal IngressSpec: [%s/%s]'s applied config failed,error: %v", oldIngres.GetNamespace(), oldIngres.GetName(), err)
return false, err
}
return apiequality.Semantic.DeepEqual(oldIngressSpec, newIngress.Spec), nil
}
return false, nil
}