feat: wip on business metrics

controllers/tenant/rolebindings.go

@@ -121,7 +121,7 @@ func (r *Manager) ownerRoleBinding(tenant *capsulev1beta1.Tenant) error {
 	newLabels := map[string]string{tl: tenant.Name}
 
 	for _, owner := range tenant.Spec.Owners {
-		if owner.Kind == "ServiceAccount" {
+		if owner.Kind == rbacv1.ServiceAccountKind {
 			splitName := strings.Split(owner.Name, ":")
 			subjects = append(subjects, rbacv1.Subject{
 				Kind:      owner.Kind.String(),

pkg/indexer/tenant/status.go

@@ -0,0 +1,42 @@
+// Copyright 2020-2021 Clastix Labs
+// SPDX-License-Identifier: Apache-2.0
+
+package tenant
+
+import (
+	"context"
+
+	"k8s.io/apimachinery/pkg/fields"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	capsulev1beta1 "github.com/clastix/capsule/api/v1beta1"
+)
+
+func ListByStatus(ctx context.Context, clt client.Client, state string) (tenantList *capsulev1beta1.TenantList, err error) {
+	tenantList = &capsulev1beta1.TenantList{}
+
+	if err = clt.List(ctx, tenantList, client.MatchingFieldsSelector{
+		Selector: fields.OneTermEqualSelector(".status.state", state),
+	}); err != nil {
+		return
+	}
+
+	return
+}
+
+type State struct {
+}
+
+func (o State) Object() client.Object {
+	return &capsulev1beta1.Tenant{}
+}
+
+func (o State) Field() string {
+	return ".status.state"
+}
+
+func (o State) Func() client.IndexerFunc {
+	return func(object client.Object) []string {
+		return []string{string(object.(*capsulev1beta1.Tenant).Status.State)}
+	}
+}

pkg/metrics/tenant_status.go

@@ -0,0 +1,43 @@
+package metrics
+
+import (
+	"context"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/clastix/capsule/api/v1beta1"
+	"github.com/clastix/capsule/pkg/indexer/tenant"
+)
+
+func NewActiveTenantCollector(ctx context.Context, clt client.Client) prometheus.Collector {
+	return prometheus.NewCounterFunc(prometheus.CounterOpts{
+		Namespace: "capsule",
+		Subsystem: "tenant",
+		Name:      "active",
+		Help:      "sum of active Tenant resources in Active state",
+	}, func() float64 {
+		list, err := tenant.ListByStatus(ctx, clt, string(v1beta1.TenantStateActive))
+		if err != nil {
+			return -1
+		}
+
+		return float64(len(list.Items))
+	})
+}
+
+func NewCordonedTenantCollector(ctx context.Context, clt client.Client) prometheus.Collector {
+	return prometheus.NewCounterFunc(prometheus.CounterOpts{
+		Namespace: "capsule",
+		Subsystem: "tenant",
+		Name:      "cordoned",
+		Help:      "sum of Tenant resources in Cordoned state",
+	}, func() float64 {
+		list, err := tenant.ListByStatus(ctx, clt, string(v1beta1.TenantStateCordoned))
+		if err != nil {
+			return -1
+		}
+
+		return float64(len(list.Items))
+	})
+}