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| 1 | +package v1alpha1 |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "strings" |
| 7 | + |
| 8 | + "github.com/go-logr/logr" |
| 9 | + v1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1" |
| 10 | + "k8s.io/apimachinery/pkg/api/errors" |
| 11 | + "k8s.io/apimachinery/pkg/runtime" |
| 12 | + "k8s.io/apimachinery/pkg/runtime/schema" |
| 13 | + "k8s.io/apimachinery/pkg/types" |
| 14 | + ctrl "sigs.k8s.io/controller-runtime" |
| 15 | + "sigs.k8s.io/controller-runtime/pkg/client" |
| 16 | + "sigs.k8s.io/controller-runtime/pkg/client/apiutil" |
| 17 | + logf "sigs.k8s.io/controller-runtime/pkg/log" |
| 18 | + "sigs.k8s.io/controller-runtime/pkg/runtime/inject" |
| 19 | + "sigs.k8s.io/controller-runtime/pkg/webhook" |
| 20 | + "sigs.k8s.io/controller-runtime/pkg/webhook/admission" |
| 21 | +) |
| 22 | + |
| 23 | +// generateValidatePath is a copy from controller-runtime |
| 24 | +func generateValidatePath(gvk schema.GroupVersionKind) string { |
| 25 | + return "/validate-" + strings.ReplaceAll(gvk.Group, ".", "-") + "-" + |
| 26 | + gvk.Version + "-" + strings.ToLower(gvk.Kind) |
| 27 | +} |
| 28 | + |
| 29 | +//+kubebuilder:webhook:path=/validate-ydb-tech-v1alpha1-databasemonitoring,mutating=false,failurePolicy=fail,sideEffects=None,groups=ydb.tech,resources=databasemonitorings,verbs=create,versions=v1alpha1,name=vdatabasemonitoring.kb.io,admissionReviewVersions=v1 |
| 30 | +//+kubebuilder:webhook:path=/validate-ydb-tech-v1alpha1-storagemonitoring,mutating=false,failurePolicy=fail,sideEffects=None,groups=ydb.tech,resources=storagemonitorings,verbs=create,versions=v1alpha1,name=vstoragemonitoring.kb.io,admissionReviewVersions=v1 |
| 31 | + |
| 32 | +func RegisterMonitoringValidatingWebhook(mgr ctrl.Manager, enableServiceMonitoring bool) error { |
| 33 | + // We are using low-level api here because we need pass client to handler |
| 34 | + |
| 35 | + srv := mgr.GetWebhookServer() |
| 36 | + |
| 37 | + registerWebHook := func(typ runtime.Object, logName string) error { |
| 38 | + gvk, err := apiutil.GVKForObject(typ, mgr.GetScheme()) |
| 39 | + if err != nil { |
| 40 | + return err |
| 41 | + } |
| 42 | + |
| 43 | + path := generateValidatePath(gvk) |
| 44 | + logf.Log.WithName("monitoring-webhooks").Info("Registering a validating webhook", "GVK", gvk, "path", path) |
| 45 | + srv.Register(path, &webhook.Admission{ |
| 46 | + Handler: &monitoringValidationHandler{ |
| 47 | + logger: logf.Log.WithName(logName), |
| 48 | + enableServiceMonitoring: enableServiceMonitoring, |
| 49 | + mgr: mgr, |
| 50 | + }, |
| 51 | + }) |
| 52 | + return nil |
| 53 | + } |
| 54 | + |
| 55 | + if err := registerWebHook(&DatabaseMonitoring{}, "databasemonitoring-resource"); err != nil { |
| 56 | + return err |
| 57 | + } |
| 58 | + |
| 59 | + return registerWebHook(&StorageMonitoring{}, "storagemonitoring-resource") |
| 60 | +} |
| 61 | + |
| 62 | +func ensureNoServiceMonitor(ctx context.Context, client client.Client, namespace string, name string) error { |
| 63 | + found := &v1.ServiceMonitor{} |
| 64 | + err := client.Get(ctx, types.NamespacedName{Namespace: namespace, Name: name}, found) |
| 65 | + fmt.Printf("err = %v, namespace=%s, name=%s\n", err, namespace, name) |
| 66 | + if err == nil { |
| 67 | + return fmt.Errorf("service monitor with name %s already exists", name) |
| 68 | + } |
| 69 | + |
| 70 | + if errors.IsNotFound(err) { |
| 71 | + return nil |
| 72 | + } |
| 73 | + |
| 74 | + return err |
| 75 | +} |
| 76 | + |
| 77 | +type monitoringValidationHandler struct { |
| 78 | + enableServiceMonitoring bool |
| 79 | + logger logr.Logger |
| 80 | + client client.Client |
| 81 | + mgr ctrl.Manager |
| 82 | + decoder *admission.Decoder |
| 83 | +} |
| 84 | + |
| 85 | +var ( |
| 86 | + _ inject.Client = &monitoringValidationHandler{} |
| 87 | + _ admission.Handler = &monitoringValidationHandler{} |
| 88 | +) |
| 89 | + |
| 90 | +func (v *monitoringValidationHandler) Handle(ctx context.Context, req admission.Request) admission.Response { |
| 91 | + if !v.enableServiceMonitoring { |
| 92 | + return webhook.Denied("the ydb-operator is running without a service monitoring feature.") |
| 93 | + } |
| 94 | + |
| 95 | + err := checkMonitoringCRD(v.mgr, v.logger, false) |
| 96 | + if err != nil { |
| 97 | + return webhook.Denied(err.Error()) |
| 98 | + } |
| 99 | + |
| 100 | + // Name can't be an empty string here because it's required in the schema |
| 101 | + err = ensureNoServiceMonitor(ctx, v.client, req.Namespace, req.Name) |
| 102 | + if err != nil { |
| 103 | + return webhook.Denied(err.Error()) |
| 104 | + } |
| 105 | + |
| 106 | + return admission.Allowed("") |
| 107 | +} |
| 108 | + |
| 109 | +func (v *monitoringValidationHandler) InjectClient(c client.Client) error { |
| 110 | + v.client = c |
| 111 | + return nil |
| 112 | +} |
| 113 | + |
| 114 | +func (v *monitoringValidationHandler) InjectDecoder(d *admission.Decoder) error { |
| 115 | + v.decoder = d |
| 116 | + return nil |
| 117 | +} |
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