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clickhouseuser_controller.go
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/
clickhouseuser_controller.go
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// Copyright (c) 2022 Aiven, Helsinki, Finland. https://aiven.io/
package controllers
import (
"context"
"crypto/rand"
"fmt"
"strconv"
"time"
corev1 "k8s.io/api/core/v1"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"github.com/aiven/aiven-go-client"
"github.com/aiven/aiven-operator/api/v1alpha1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
)
// ClickhouseUserReconciler reconciles a ClickhouseUser object
type ClickhouseUserReconciler struct {
Controller
}
//+kubebuilder:rbac:groups=aiven.io,resources=clickhouseusers,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=aiven.io,resources=clickhouseusers/status,verbs=get;update;patch
func (r *ClickhouseUserReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
log := r.Log.WithValues("clickhouseuser", req.NamespacedName)
// fetch the clickhouse userinstance
user := &v1alpha1.ClickhouseUser{}
err := r.Get(ctx, req.NamespacedName, user)
if err != nil {
if errors.IsNotFound(err) {
// Request object not token, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
log.Info("clickhouse user resource not token. ignoring since object must be deleted")
return ctrl.Result{}, nil
}
// Error reading the object - requeue the request.
log.Error(err, "failed to get clickhouse user")
return ctrl.Result{}, err
}
r.Controller.Recorder.Event(user, corev1.EventTypeNormal, eventReconciliationStarted, "starting reconciliation")
clientAuthSecret := &corev1.Secret{}
if err := r.Controller.Get(ctx, types.NamespacedName{Name: user.AuthSecretRef().Name, Namespace: req.Namespace}, clientAuthSecret); err != nil {
r.Controller.Recorder.Eventf(user, corev1.EventTypeWarning, eventUnableToGetAuthSecret, err.Error())
return ctrl.Result{}, fmt.Errorf("cannot get secret %q: %w", user.AuthSecretRef().Name, err)
}
avn, err := aiven.NewTokenClient(string(clientAuthSecret.Data[user.AuthSecretRef().Key]), "k8s-operator/")
if err != nil {
r.Controller.Recorder.Event(user, corev1.EventTypeWarning, eventUnableToCreateClient, err.Error())
return ctrl.Result{}, fmt.Errorf("cannot initialize aiven client: %w", err)
}
// check if the clickhouse User instance is marked to be deleted, which is
// indicated by the deletion timestamp being set.
isCHUserMarkedToBeDeleted := user.GetDeletionTimestamp() != nil
if isCHUserMarkedToBeDeleted {
if controllerutil.ContainsFinalizer(user, instanceDeletionFinalizer) {
// run finalization logic for instanceDeletionFinalizer. If the
// finalization logic fails, don't remove the finalizer so
// that we can retry during the next reconciliation.
r.Controller.Recorder.Event(user, corev1.EventTypeNormal, eventTryingToDeleteAtAiven, "deleting clickhouse user on aiven side")
if len(user.Status.UUID) > 0 {
if err := avn.ClickhouseUser.Delete(user.Spec.Project, user.Spec.ServiceName, user.Status.UUID); err != nil {
r.Controller.Recorder.Event(user, corev1.EventTypeWarning, eventUnableToDeleteAtAiven, err.Error())
return reconcile.Result{}, err
}
}
r.Controller.Recorder.Event(user, corev1.EventTypeNormal, eventSuccessfullyDeletedAtAiven, "clickhouse user was deleted on aiven side")
// remove instanceDeletionFinalizer. Once all finalizers have been
// removed, the object will be deleted.
controllerutil.RemoveFinalizer(user, instanceDeletionFinalizer)
err := r.Client.Update(ctx, user)
if err != nil {
r.Controller.Recorder.Event(user, corev1.EventTypeWarning, eventUnableToDeleteFinalizer, err.Error())
return reconcile.Result{}, err
}
}
return reconcile.Result{}, nil
}
// add finalizer for this CR
if !controllerutil.ContainsFinalizer(user, instanceDeletionFinalizer) {
if err := addFinalizer(ctx, r.Client, user, instanceDeletionFinalizer); err != nil {
r.Controller.Recorder.Event(user, corev1.EventTypeWarning, eventUnableToAddFinalizer, err.Error())
return reconcile.Result{}, err
}
r.Controller.Recorder.Event(user, corev1.EventTypeNormal, eventAddedFinalizer, "added to clickhouse user instance")
}
var password string
ready, err := checkPreconditions(avn, user)
if err != nil {
log.Error(err, "failed to check clickhouse user preconditions")
return ctrl.Result{}, err
}
if !ready {
log.Info("clickuse user prorecontions are not met, requeue in a 10s")
return ctrl.Result{Requeue: true, RequeueAfter: formatIntBaseDecimal * time.Second}, nil
}
// check if Clickhouse User already exists on the Aiven side, create a
// new one if it is not found
uuid, err := r.isAlreadyExists(avn, user)
if err != nil {
log.Error(err, "failed to check is clickhouse user exists")
return ctrl.Result{}, err
}
if !isAlreadyProcessed(user) {
if len(uuid) > 0 {
pass, err := r.generatePassword()
if err != nil {
log.Error(err, "failed to generate a clickhouse user password")
return ctrl.Result{}, err
}
p, err := avn.ClickhouseUser.ResetPassword(user.Spec.Project, user.Spec.ServiceName, uuid, pass)
if err != nil {
r.Controller.Recorder.Event(user, corev1.EventTypeWarning, eventUnableToCreateOrUpdateAtAiven, err.Error())
log.Error(err, "failed to reset clickhouse user password")
return ctrl.Result{}, err
}
password = p
} else {
u, err := avn.ClickhouseUser.Create(user.Spec.Project, user.Spec.ServiceName, user.Name)
if err != nil {
r.Controller.Recorder.Event(user, corev1.EventTypeWarning, eventUnableToCreateOrUpdateAtAiven, err.Error())
log.Error(err, "failed to create a clickhouse user")
return ctrl.Result{}, err
}
uuid = u.User.UUID
password = u.User.Password
meta.SetStatusCondition(&user.Status.Conditions,
getInitializedCondition("Updated",
"Instance was updated on Aiven side"))
}
// marking generation as processed and running
metav1.SetMetaDataAnnotation(&user.ObjectMeta,
processedGenerationAnnotation, strconv.FormatInt(user.GetGeneration(), formatIntBaseDecimal))
metav1.SetMetaDataAnnotation(&user.ObjectMeta, instanceIsRunningAnnotation, "true")
// setting status conditions to running
meta.SetStatusCondition(&user.Status.Conditions,
getRunningCondition(metav1.ConditionTrue, "CheckRunning",
"Instance is running on Aiven side"))
// creation of a secret
err := r.createSecret(ctx, avn, user, password)
if err != nil {
log.Error(err, "failed to create a clickhouse user secret")
return ctrl.Result{}, err
}
// updating clickhouse user resource status
user.Status.UUID = uuid
err = r.Status().Update(context.Background(), user)
if err != nil {
log.Error(err, "failed to update a clickhouse user cr status")
return ctrl.Result{}, err
}
}
r.Controller.Recorder.Event(user, corev1.EventTypeNormal, eventInstanceIsRunning, "clickhouse user is in a RUNNING state")
log.Info("clickhouse user instance was successfully reconciled")
return ctrl.Result{}, nil
}
func (*ClickhouseUserReconciler) generatePassword() (string, error) {
c := 16
b := make([]byte, c)
_, err := rand.Read(b)
return fmt.Sprintf("%x", b), err
}
func (r *ClickhouseUserReconciler) createSecret(ctx context.Context, avn *aiven.Client, user *v1alpha1.ClickhouseUser, password string) error {
s, err := avn.Services.Get(user.Spec.Project, user.Spec.ServiceName)
if err != nil {
return fmt.Errorf("cannot get a clickhouse service %w", err)
}
params := s.URIParams
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: r.getSecretName(user),
Namespace: user.Namespace,
},
StringData: map[string]string{
"HOST": params["host"],
"PORT": params["port"],
"PASSWORD": password,
"USERNAME": user.Name,
},
}
_, err = controllerutil.CreateOrUpdate(ctx, r.Client, secret, func() error {
return ctrl.SetControllerReference(user, secret, r.Scheme)
})
return err
}
func (*ClickhouseUserReconciler) isAlreadyExists(avn *aiven.Client, user *v1alpha1.ClickhouseUser) (string, error) {
l, err := avn.ClickhouseUser.List(user.Spec.Project, user.Spec.ServiceName)
if err != nil {
return "", err
}
for _, u := range l.Users {
if u.Name == user.Name {
return u.UUID, nil
}
}
return "", nil
}
func checkPreconditions(avn *aiven.Client, user *v1alpha1.ClickhouseUser) (bool, error) {
meta.SetStatusCondition(&user.Status.Conditions,
getInitializedCondition("Preconditions", "Checking preconditions"))
return checkServiceIsRunning(avn, user.Spec.Project, user.Spec.ServiceName)
}
func (r *ClickhouseUserReconciler) getSecretName(user *v1alpha1.ClickhouseUser) string {
if user.Spec.ConnInfoSecretTarget.Name != "" {
return user.Spec.ConnInfoSecretTarget.Name
}
return user.Name
}
// SetupWithManager sets up the controller with the Manager.
func (r *ClickhouseUserReconciler) SetupWithManager(mgr ctrl.Manager) error {
return ctrl.NewControllerManagedBy(mgr).
For(&v1alpha1.ClickhouseUser{}).
Owns(&corev1.Secret{}).
Complete(r)
}