Add concurrency to metrics and loki client

.dockerignore

@@ -1,3 +1,4 @@
 config.yaml
 build
 README.md
+docs

README.md

@@ -1,8 +1,8 @@
 # PolicyReporter
 
-PolicyReporter is a simple tool to watch for PolicyReports in your cluster.
+## Motivation
 
-It uses this resources to create Prometheus Metrics from it. It also provides a configuration to push rule validation results to Grafana Loki.
+Kyverno ships with two types of validation. You can either enforce a rule or audit it. If you don't want to block developers or if you want to try out what a new rule you can audit it. The audit configuration creates PolicyReports which you can describe or read with over `kubectl` but it's not that easy to get a good overview. To solve this problem this tool sends informations from PolicyReports to Loki and provide a Metrics endpoint to get metrics about summaries and each rule result.
 
 ## Installation with Helm v3
 
@@ -34,3 +34,7 @@ policyPriorities:
 ![Grafana Loki](https://github.com/fjogeleit/policy-reporter/blob/main/docs/images/grafana-loki.png?raw=true)
 
 ![Prometheus Metrics](https://github.com/fjogeleit/policy-reporter/blob/main/docs/images/prometheus.png?raw=true)
+
+# Todos
+* Support for ClusterPolicyReports
+* Additional Targets

cmd/root.go

@@ -6,7 +6,6 @@ import (
 	"net/http"
 
 	"github.com/fjogeleit/policy-reporter/pkg/config"
-	"github.com/fjogeleit/policy-reporter/pkg/metrics"
 	"github.com/fjogeleit/policy-reporter/pkg/report"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/spf13/cobra"
@@ -46,11 +45,16 @@ func NewCLI() *cobra.Command {
 
 			if loki != nil {
 				go client.WatchRuleValidation(func(r report.Result) {
-					loki.Send(r)
+					go loki.Send(r)
 				})
 			}
 
-			go metrics.GenerateMetrics(client)
+			metrics, err := resolver.Metrics()
+			if err != nil {
+				return err
+			}
+
+			go metrics.GenerateMetrics()
 
 			http.Handle("/metrics", promhttp.Handler())
 			http.ListenAndServe(":2112", nil)

pkg/config/resolver.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"github.com/fjogeleit/policy-reporter/pkg/kubernetes"
+	"github.com/fjogeleit/policy-reporter/pkg/metrics"
 	"github.com/fjogeleit/policy-reporter/pkg/target"
 	"github.com/fjogeleit/policy-reporter/pkg/target/loki"
 )
@@ -9,6 +10,7 @@ import (
 var (
 	kubeClient       kubernetes.Client
 	lokiClient       target.Client
+	metricsGenerator *metrics.Metrics
 )
 
 type Resolver struct {
@@ -35,6 +37,19 @@ func (r *Resolver) LokiClient() target.Client {
 	return loki.NewClient(r.config.Loki.Host)
 }
 
+func (r *Resolver) Metrics() (*metrics.Metrics, error) {
+	if metricsGenerator != nil {
+		return metricsGenerator, nil
+	}
+
+	client, err := r.KubernetesClient()
+	if err != nil {
+		return nil, err
+	}
+
+	return metrics.NewMetrics(client), nil
+}
+
 func NewResolver(config *Config) Resolver {
 	return Resolver{config}
 }

pkg/metrics/metrics.go

@@ -1,6 +1,8 @@
 package metrics
 
 import (
+	"sync"
+
 	"github.com/fjogeleit/policy-reporter/pkg/kubernetes"
 	"github.com/fjogeleit/policy-reporter/pkg/report"
 	"github.com/prometheus/client_golang/prometheus"
@@ -8,22 +10,47 @@ import (
 	"k8s.io/apimachinery/pkg/watch"
 )
 
-func GenerateMetrics(client kubernetes.Client) {
+type Metrics struct {
+	client  kubernetes.Client
+	cache   map[string]report.PolicyReport
+	rwmutex *sync.RWMutex
+}
+
+func (m Metrics) getCachedReport(i string) report.PolicyReport {
+	m.rwmutex.RLock()
+	defer m.rwmutex.RUnlock()
+	return m.cache[i]
+}
+
+func (m Metrics) cachedReport(r report.PolicyReport) {
+	m.rwmutex.Lock()
+	m.cache[r.GetIdentifier()] = r
+	m.rwmutex.Unlock()
+}
+
+func (m Metrics) removeCachedReport(i string) {
+	m.rwmutex.Lock()
+	delete(m.cache, i)
+	m.rwmutex.Unlock()
+}
+
+func (m Metrics) GenerateMetrics() {
 	policyGauge := promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Name: "policy_report",
+		Name: "policy_report_summary",
+		Help: "Summary of all PolicyReports",
 	}, []string{"namespace", "name", "status"})
 
 	ruleGauge := promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Name: "rule_validation",
+		Name: "policy_report_result",
+		Help: "List of all PolicyReport Results",
 	}, []string{"namespace", "rule", "policy", "kind", "name", "status"})
 
 	prometheus.Register(policyGauge)
 	prometheus.Register(ruleGauge)
 
-	cache := make(map[string]report.PolicyReport)
+	m.client.WatchPolicyReports(func(e watch.EventType, r report.PolicyReport) {
-
+		go func(event watch.EventType, report report.PolicyReport) {
-	client.WatchPolicyReports(func(s watch.EventType, report report.PolicyReport) {
+			switch event {
-		switch s {
 			case watch.Added:
 				updatePolicyGauge(policyGauge, report)
 
@@ -32,11 +59,11 @@ func GenerateMetrics(client kubernetes.Client) {
 					ruleGauge.WithLabelValues(report.Namespace, rule.Rule, rule.Policy, res.Kind, res.Name, rule.Status).Set(1)
 				}
 
-			cache[report.GetIdentifier()] = report
+				m.cachedReport(report)
 			case watch.Modified:
 				updatePolicyGauge(policyGauge, report)
 
-			for _, rule := range cache[report.GetIdentifier()].Results {
+				for _, rule := range m.getCachedReport(report.GetIdentifier()).Results {
 					res := rule.Resources[0]
 					ruleGauge.WithLabelValues(report.Namespace, rule.Rule, rule.Policy, res.Kind, res.Name, rule.Status).Set(0)
 				}
@@ -57,8 +84,9 @@ func GenerateMetrics(client kubernetes.Client) {
 					ruleGauge.WithLabelValues(report.Namespace, rule.Rule, rule.Policy, res.Kind, res.Name, rule.Status).Set(0)
 				}
 
-			delete(cache, report.GetIdentifier())
+				m.removeCachedReport(report.GetIdentifier())
 			}
+		}(e, r)
 	})
 }
 
@@ -79,3 +107,11 @@ func updatePolicyGauge(policyGauge *prometheus.GaugeVec, report report.PolicyRep
 		WithLabelValues(report.Namespace, report.Name, "Skip").
 		Set(float64(report.Summary.Skip))
 }
+
+func NewMetrics(client kubernetes.Client) *Metrics {
+	return &Metrics{
+		client:  client,
+		cache:   make(map[string]report.PolicyReport),
+		rwmutex: new(sync.RWMutex),
+	}
+}