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controller.go
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controller.go
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package controllers
import (
"context"
"fmt"
"reflect"
"strings"
"github.com/go-logr/logr"
"github.com/hashicorp/go-multierror"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/record"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"github.com/aiven/aiven-go-client"
"github.com/aiven/aiven-operator/api/v1alpha1"
)
// formatIntBaseDecimal it is a base to format int64 to string
const formatIntBaseDecimal = 10
type (
// Controller reconciles the Aiven objects
Controller struct {
client.Client
Log logr.Logger
Scheme *runtime.Scheme
Recorder record.EventRecorder
}
// Handlers represents Aiven API handlers
// It intended to be a layer between Kubernetes and Aiven API that handles all aspects
// of the Aiven services lifecycle.
Handlers interface {
// create or updates an instance on the Aiven side.
createOrUpdate(*aiven.Client, client.Object) error
// delete removes an instance on Aiven side.
// If an object is already deleted and cannot be found, it should not be an error. For other deletion
// errors, return an error.
delete(*aiven.Client, client.Object) (bool, error)
// get retrieve an object and a secret (for example, connection credentials) that is generated on the
// fly based on data from Aiven API. When not applicable to service, it should return nil.
get(*aiven.Client, client.Object) (*corev1.Secret, error)
// checkPreconditions check whether all preconditions for creating (or updating) the resource are in place.
// For example, it is applicable when a service needs to be running before this resource can be created.
checkPreconditions(*aiven.Client, client.Object) (bool, error)
}
aivenManagedObject interface {
client.Object
AuthSecretRef() v1alpha1.AuthSecretReference
}
)
const (
// Lifecycle event types we expose to the user
eventUnableToGetAuthSecret = "UnableToGetAuthSecret"
eventUnableToCreateClient = "UnableToCreateClient"
eventReconciliationStarted = "ReconcilationStarted"
eventTryingToDeleteAtAiven = "TryingToDeleteAtAiven"
eventUnableToDeleteAtAiven = "UnableToDeleteAtAiven"
eventUnableToDeleteFinalizer = "UnableToDeleteFinalizer"
eventSuccessfullyDeletedAtAiven = "SuccessfullyDeletedAtAiven"
eventAddedFinalizer = "InstanceFinalizerAdded"
eventUnableToAddFinalizer = "UnableToAddFinalizer"
eventWaitingforPreconditions = "WaitingForPreconditions"
eventUnableToWaitForPreconditions = "UnableToWaitForPreconditions"
eventPreconditionsAreMet = "PreconditionsAreMet"
eventUnableToCreateOrUpdateAtAiven = "UnableToCreateOrUpdateAtAiven"
eventCreateOrUpdatedAtAiven = "CreateOrUpdatedAtAiven"
eventCreatedOrUpdatedAtAiven = "CreatedOrUpdatedAtAiven"
eventWaitingForTheInstanceToBeRunning = "WaitingForInstanceToBeRunning"
eventUnableToWaitForInstanceToBeRunning = "UnableToWaitForInstanceToBeRunning"
eventInstanceIsRunning = "InstanceIsRunning"
)
// +kubebuilder:rbac:groups=coordination.k8s.io,resources=leases,verbs=get;list;create;update
// +kubebuilder:rbac:groups="",resources=secrets,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups="",resources=events,verbs=create;patch
func (c *Controller) reconcileInstance(ctx context.Context, req ctrl.Request, h Handlers, o aivenManagedObject) (ctrl.Result, error) {
if err := c.Get(ctx, req.NamespacedName, o); err != nil {
return ctrl.Result{}, client.IgnoreNotFound(err)
}
instanceLogger := setupLogger(c.Log, o)
instanceLogger.Info("setting up aiven client with instance secret")
clientAuthSecret := &corev1.Secret{}
if err := c.Get(ctx, types.NamespacedName{Name: o.AuthSecretRef().Name, Namespace: req.Namespace}, clientAuthSecret); err != nil {
c.Recorder.Eventf(o, corev1.EventTypeWarning, eventUnableToGetAuthSecret, err.Error())
return ctrl.Result{}, fmt.Errorf("cannot get secret %q: %w", o.AuthSecretRef().Name, err)
}
avn, err := aiven.NewTokenClient(string(clientAuthSecret.Data[o.AuthSecretRef().Key]), "k8s-operator/")
if err != nil {
c.Recorder.Event(o, corev1.EventTypeWarning, eventUnableToCreateClient, err.Error())
return ctrl.Result{}, fmt.Errorf("cannot initialize aiven client: %w", err)
}
return instanceReconcilerHelper{
avn: avn,
k8s: c.Client,
hnd: h,
log: instanceLogger,
scrt: clientAuthSecret,
rec: c.Recorder,
}.reconcileInstance(ctx, o)
}
// a helper that closes over all instance specific fields
// to make reconciliation a little more ergonomic
type instanceReconcilerHelper struct {
k8s client.Client
// aiven client that is authorized with the instance token
avn *aiven.Client
// instance specific handler implementation
hnd Handlers
// secret that contains the aiven token for the instance
scrt *corev1.Secret
// logger setup with structured fields for the instance
log logr.Logger
// recprder to record events for the object
rec record.EventRecorder
}
func (ir instanceReconcilerHelper) reconcileInstance(ctx context.Context, o client.Object) (ctrl.Result, error) {
ir.log.Info("reconciling instance")
ir.rec.Event(o, corev1.EventTypeNormal, eventReconciliationStarted, "starting reconciliation")
ir.log.Info("handling finalizers")
if markedForDeletion(o) {
if controllerutil.ContainsFinalizer(o, instanceDeletionFinalizer) {
ir.rec.Event(o, corev1.EventTypeNormal, eventTryingToDeleteAtAiven, "trying to delete instance at aiven")
if err := ir.deleteSync(o); err != nil && !ir.canBeDeleted(o, err) {
ir.rec.Event(o, corev1.EventTypeWarning, eventUnableToDeleteAtAiven, err.Error())
return ctrl.Result{}, fmt.Errorf("unable to delete instance at aiven: %w", err)
}
ir.log.Info("instance was successfully deleted at aiven, removing finalizer")
ir.rec.Event(o, corev1.EventTypeNormal, eventSuccessfullyDeletedAtAiven, "instance is gone at aiven now")
if err := removeFinalizer(ctx, ir.k8s, o, instanceDeletionFinalizer); err != nil {
ir.rec.Event(o, corev1.EventTypeWarning, eventUnableToDeleteFinalizer, err.Error())
return ctrl.Result{}, fmt.Errorf("unable to remove finalizer: %w", err)
}
}
return ctrl.Result{}, nil
} else {
if !controllerutil.ContainsFinalizer(ir.scrt, secretProtectionFinalizer) {
ir.log.Info("adding finalizer to secret")
if err := addFinalizer(ctx, ir.k8s, ir.scrt, secretProtectionFinalizer); err != nil {
return ctrl.Result{}, fmt.Errorf("unable to add finalizer to secret: %w", err)
}
}
if !controllerutil.ContainsFinalizer(o, instanceDeletionFinalizer) {
ir.log.Info("adding finalizer to instance")
if err := addFinalizer(ctx, ir.k8s, o, instanceDeletionFinalizer); err != nil {
ir.rec.Eventf(o, corev1.EventTypeWarning, eventUnableToAddFinalizer, err.Error())
return ctrl.Result{}, fmt.Errorf("unable to add finalizer to instance: %w", err)
}
ir.rec.Event(o, corev1.EventTypeNormal, eventAddedFinalizer, "instance finalizer added")
}
}
ir.log.Info("handling service update/creation")
ir.rec.Event(o, corev1.EventTypeNormal, eventWaitingforPreconditions, "waiting for preconditions of the instance")
if err := ir.waitForPreconditions(o); err != nil {
ir.rec.Event(o, corev1.EventTypeWarning, eventUnableToWaitForPreconditions, err.Error())
return ctrl.Result{}, fmt.Errorf("unable to wait for preconditions: %w", err)
}
ir.rec.Event(o, corev1.EventTypeNormal, eventPreconditionsAreMet, "preconditions are met, proceeding to create or update")
ir.rec.Event(o, corev1.EventTypeNormal, eventCreateOrUpdatedAtAiven, "about to create instance at aiven")
if err := ir.createOrUpdateInstance(o); err != nil {
ir.rec.Event(o, corev1.EventTypeWarning, eventUnableToCreateOrUpdateAtAiven, err.Error())
return ctrl.Result{}, fmt.Errorf("unable to create or update instance at aiven: %w", err)
}
ir.rec.Event(o, corev1.EventTypeNormal, eventCreatedOrUpdatedAtAiven, "instance was created at aiven but may not be running yet")
ir.rec.Event(o, corev1.EventTypeNormal, eventWaitingForTheInstanceToBeRunning, "waiting for the instance to be running")
if err := ir.updateInstanceStateAndSecretUntilRunning(ctx, o); err != nil {
ir.rec.Event(o, corev1.EventTypeWarning, eventUnableToWaitForInstanceToBeRunning, err.Error())
return ctrl.Result{}, fmt.Errorf("unable to wait until instance is running: %w", err)
}
ir.rec.Event(o, corev1.EventTypeNormal, eventInstanceIsRunning, "instance is in a RUNNING state")
ir.log.Info("instance was successfully reconciled")
return ctrl.Result{}, nil
}
// canBeDeleted checks if an instance can be deleted despite error
func (ir instanceReconcilerHelper) canBeDeleted(o client.Object, err error) bool {
if err == nil {
return true
}
// When an instance was created but pointing to an invalid API token
// and no generation was ever processed, allow deleting such instance
return !isAlreadyProcessed(o) && !isAlreadyRunning(o) &&
strings.Contains(err.Error(), "Invalid token")
}
func (ir instanceReconcilerHelper) deleteSync(o client.Object) error {
return wait.PollImmediate(pollInterval, pollTimeout, func() (bool, error) {
ir.log.Info("trying to delete aiven instance")
return ir.hnd.delete(ir.avn, o)
})
}
func (ir instanceReconcilerHelper) waitForPreconditions(o client.Object) error {
return wait.PollImmediate(pollInterval, pollTimeout, func() (bool, error) {
ir.log.Info("checking preconditions")
return ir.hnd.checkPreconditions(ir.avn, o)
})
}
func (ir instanceReconcilerHelper) createOrUpdateInstance(o client.Object) error {
ir.log.Info("checking if generation was processed")
if isAlreadyProcessed(o) {
return nil
}
ir.log.Info("generation wasn't processed, creation or updating instance on aiven side")
a := o.GetAnnotations()
delete(a, processedGenerationAnnotation)
delete(a, instanceIsRunningAnnotation)
if err := ir.hnd.createOrUpdate(ir.avn, o); err != nil {
return fmt.Errorf("unable to create or update aiven instance: %w", err)
}
ir.log.Info(
"processed instance, updating annotations",
"generation", o.GetGeneration(),
"annotations", o.GetAnnotations(),
)
return nil
}
func (ir instanceReconcilerHelper) updateInstanceStateAndSecretUntilRunning(ctx context.Context, o client.Object) (err error) {
return wait.PollImmediate(pollInterval, pollTimeout, func() (bool, error) {
ir.log.Info("checking if instance is ready")
defer func() {
err = multierror.Append(err, ir.k8s.Status().Update(ctx, o))
err = multierror.Append(err, ir.k8s.Update(ctx, o))
err = err.(*multierror.Error).ErrorOrNil()
}()
serviceSecret, err := ir.hnd.get(ir.avn, o)
if err != nil {
if aiven.IsNotFound(err) {
return false, nil
}
return false, fmt.Errorf("unable to get aiven instance: %w", err)
} else if serviceSecret != nil {
if err = ir.createOrUpdateSecret(ctx, o, serviceSecret); err != nil {
return false, fmt.Errorf("unable to create or update aiven secret: %w", err)
}
}
return isAlreadyRunning(o), nil
})
}
func (ir instanceReconcilerHelper) createOrUpdateSecret(ctx context.Context, owner client.Object, want *corev1.Secret) error {
_, err := controllerutil.CreateOrUpdate(ctx, ir.k8s, want, func() error {
return ctrl.SetControllerReference(owner, want, ir.k8s.Scheme())
})
return err
}
func setupLogger(log logr.Logger, o client.Object) logr.Logger {
a := make(map[string]string)
if r, ok := o.GetAnnotations()[instanceIsRunningAnnotation]; ok {
a[instanceIsRunningAnnotation] = r
}
if g, ok := o.GetAnnotations()[processedGenerationAnnotation]; ok {
a[processedGenerationAnnotation] = g
}
kind := strings.ToLower(o.GetObjectKind().GroupVersionKind().Kind)
name := types.NamespacedName{Name: o.GetName(), Namespace: o.GetNamespace()}
return log.WithValues("kind", kind, "name", name, "annotations", a)
}
// UserConfigurationToAPI converts UserConfiguration options structure
// to Aiven API compatible map[string]interface{}
func UserConfigurationToAPI(c interface{}) interface{} {
result := make(map[string]interface{})
v := reflect.ValueOf(c)
// if its a pointer, resolve its value
if v.Kind() == reflect.Ptr {
v = reflect.Indirect(v)
}
if v.Kind() != reflect.Struct {
switch v.Kind() {
case reflect.Int64:
return *c.(*int64)
case reflect.Bool:
return *c.(*bool)
default:
return c
}
}
structType := v.Type()
// convert UserConfig structure to a map
for i := 0; i < structType.NumField(); i++ {
name := strings.ReplaceAll(structType.Field(i).Tag.Get("json"), ",omitempty", "")
if structType.Kind() == reflect.Struct {
result[name] = UserConfigurationToAPI(v.Field(i).Interface())
} else {
result[name] = v.Elem().Field(i).Interface()
}
}
// remove all the nil and empty map data
for key, val := range result {
if val == nil || isNil(val) || val == "" {
delete(result, key)
}
if reflect.TypeOf(val).Kind() == reflect.Map {
if len(val.(map[string]interface{})) == 0 {
delete(result, key)
}
}
}
return result
}
func isNil(i interface{}) bool {
if i == nil {
return true
}
switch reflect.TypeOf(i).Kind() {
case reflect.Ptr, reflect.Map, reflect.Array, reflect.Chan, reflect.Slice:
return reflect.ValueOf(i).IsNil()
}
return false
}
func toOptionalStringPointer(s string) *string {
if s == "" {
return nil
}
return &s
}
func getMaintenanceWindow(dow, time string) *aiven.MaintenanceWindow {
if dow != "" || time != "" {
return &aiven.MaintenanceWindow{
DayOfWeek: dow,
TimeOfDay: time,
}
}
return nil
}
func ensureSecretDataIsNotEmpty(log *logr.Logger, s *corev1.Secret) *corev1.Secret {
if s == nil {
return nil
}
for i, v := range s.StringData {
if len(v) == 0 {
if log != nil {
log.Info("secret field is empty, deleting it from the secret",
"field", v,
"secret name", s.Name)
}
delete(s.StringData, i)
}
}
return s
}