func()

in operator/controllers/operator/javaagent_controller.go [56:161]
92 lines of code
15 McCabe index (conditional complexity)

func (r *JavaAgentReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	log := runtimelog.FromContext(ctx)
	log.Info("=====================javaagent reconcile started================================")

	pod := &core.Pod{}
	err := r.Client.Get(ctx, client.ObjectKey{Namespace: req.Namespace, Name: req.Name}, pod)
	if err != nil && !apierrors.IsNotFound(err) {
		log.Error(err, "failed to get pod")
		return ctrl.Result{}, err
	}

	configmap := &core.ConfigMap{}
	configmapName := ""
	for i := range pod.Spec.Volumes {
		if pod.Spec.Volumes[i].ConfigMap != nil {
			configmapName = pod.Spec.Volumes[i].ConfigMap.Name
		}
	}

	// get pods' OwnerReferences
	if len(pod.OwnerReferences) == 0 {
		log.Error(err, "the pod isn't created by workloads")
		return ctrl.Result{}, err
	}
	ownerReference := pod.OwnerReferences[0]

	// get configmap from the volume of configmap
	if len(configmapName) > 0 {
		err = r.Client.Get(ctx, client.ObjectKey{Namespace: req.Namespace, Name: configmapName}, configmap)
		if err != nil && !apierrors.IsNotFound(err) {
			log.Error(err, "failed to get configmap")
			return ctrl.Result{}, err
		}
	} else {
		log.Info("No configmap mounted.")
	}

	swAgentList := &operatorv1alpha1.SwAgentList{}
	var lastMatchedSwAgent *operatorv1alpha1.SwAgent
	if lastMatchedSwAgent, err = r.getSwAgent(ctx, req, swAgentList, pod); err != nil {
		log.Error(err, "get SwAgent error")
		return ctrl.Result{}, err
	}
	config := map[string]string{}
	r.injectConfigBySwAgent(lastMatchedSwAgent, config)

	// only get the first selector label from labels as podselector
	labels := pod.Labels
	keys := []string{}
	for k := range labels {
		if !strings.Contains(k, injector.ActiveInjectorLabel) {
			keys = append(keys, k)
		}
	}
	if len(keys) == 0 {
		log.Error(err, "the pod doesn't contain the pod selector")
		return ctrl.Result{}, err
	}
	sort.Strings(keys)
	selectorname := strings.Join([]string{keys[0], labels[keys[0]]}, "-")
	podselector := strings.Join([]string{keys[0], labels[keys[0]]}, "=")

	app := kubernetes.Application{
		Client:   r.Client,
		FileRepo: r.FileRepo,
		CR:       pod,
		GVK:      core.SchemeGroupVersion.WithKind("Pod"),
		TmplFunc: map[string]interface{}{
			"config": func() map[string]string {
				return config
			},
			"ownerReference": func() metav1.OwnerReference {
				return ownerReference
			},
			"SelectorName": func() string {
				return selectorname
			},
			"Namespace": func() string {
				return req.Namespace
			},
			"PodSelector": func() string {
				return podselector
			},
			"ServiceName": func() string {
				return operatorv1alpha1.GetServiceName(&config)
			},
			"BackendService": func() string {
				return operatorv1alpha1.GetBackendService(&config)
			},
		},
	}

	// false means not to compose , such as ownerReferences , as we compose it as template
	_, err = app.Apply(ctx, "injector/templates/javaagent.yaml", log, false)
	if err != nil {
		log.Error(err, "failed to apply javaagent")
		return ctrl.Result{}, err
	}

	if err := r.UpdateStatus(ctx, log, req.Namespace, selectorname, podselector); err != nil {
		log.Error(err, "failed to update javaagent's status")
		return ctrl.Result{}, err
	}

	return ctrl.Result{}, nil
}