add basic test, add metrics section in readme

README.md

@@ -18,6 +18,26 @@ $GOPATH/bin/prometheus-jitsi-meet-exporter
 docker run -p 9888:9888 systemli/prometheus-jitsi-meet-exporter:latest -videobridge-url http://jitsi:8888/stats 
 ```
 
+## Metrics
+
+```
+# HELP jitsi_total_participants Participants counter
+# TYPE jitsi_total_participants counter
+jitsi_total_participants 18
+# HELP jitsi_total_conferences_created Number of conferences created
+# TYPE jitsi_total_conferences_created counter
+jitsi_total_conferences_created 14
+# HELP jitsi_largest_conference Participants in the largest conference
+# TYPE jitsi_largest_conference gauge
+jitsi_largest_conference 3
+# HELP jitsi_conferences Current number of active conferences
+# TYPE jitsi_conferences gauge
+jitsi_conferences 2
+# HELP jitsi_participants Current number of active participants
+# TYPE jitsi_participants gauge
+jitsi_participants 4
+```
+
 ## License
 
 GPLv3

main_test.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestGetMetrics(t *testing.T) {
+	req, err := http.NewRequest("GET", "/metrics", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	go func() {
+		http.HandleFunc("/stats", getJitsiVideobridgeStats)
+		if err := http.ListenAndServe(":8888", nil); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(serveMetrics)
+	handler.ServeHTTP(rr, req)
+
+	if status := rr.Code; status != http.StatusOK {
+		t.Errorf("handler returned wrong status code: got %v want %v", status, http.StatusOK)
+	}
+
+	var expected = `# HELP jitsi_total_participants Participants counter
+# TYPE jitsi_total_participants counter
+jitsi_total_participants 18
+# HELP jitsi_total_conferences_created Number of conferences created
+# TYPE jitsi_total_conferences_created counter
+jitsi_total_conferences_created 14
+# HELP jitsi_largest_conference Participants in the largest conference
+# TYPE jitsi_largest_conference gauge
+jitsi_largest_conference 3
+# HELP jitsi_conferences Current number of active conferences
+# TYPE jitsi_conferences gauge
+jitsi_conferences 2
+# HELP jitsi_participants Current number of active participants
+# TYPE jitsi_participants gauge
+jitsi_participants 4
+`
+
+	if rr.Body.String() != expected {
+		t.Error("Response does not match the expected string")
+	}
+}
+
+func getJitsiVideobridgeStats(w http.ResponseWriter, _ *http.Request) {
+	_, _ = w.Write([]byte(`{"largest_conference":3,"total_sip_call_failures":0,"total_participants":18,"conference_sizes":[0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"bridge_selector":{"total_least_loaded_in_region":0,"total_split_due_to_load":0,"total_not_loaded_in_region_in_conference":0,"total_least_loaded_in_region_in_conference":0,"total_not_loaded_in_region":0,"total_split_due_to_region":0,"bridge_count":1,"operational_bridge_count":1,"total_least_loaded_in_conference":0,"total_least_loaded":3},"total_conferences_created":14,"total_recording_failures":0,"conferences":2,"total_live_streaming_failures":0,"participants":4}`))
+}