Extract metrics to own package and refactor implementations

metrics/datadog_test.go

@@ -0,0 +1,40 @@
+package metrics
+
+import (
+	"net/http"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/containous/traefik/types"
+	"github.com/stvp/go-udp-testing"
+)
+
+func TestDatadog(t *testing.T) {
+	udp.SetAddr(":18125")
+	// This is needed to make sure that UDP Listener listens for data a bit longer, otherwise it will quit after a millisecond
+	udp.Timeout = 5 * time.Second
+
+	datadogRegistry := RegisterDatadog(&types.Datadog{Address: ":18125", PushInterval: "1s"})
+	defer StopDatadog()
+
+	if !datadogRegistry.IsEnabled() {
+		t.Errorf("DatadogRegistry should return true for IsEnabled()")
+	}
+
+	expected := []string{
+		// We are only validating counts, as it is nearly impossible to validate latency, since it varies every run
+		"traefik.requests.total:1.000000|c|#service:test,code:404,method:GET\n",
+		"traefik.requests.total:1.000000|c|#service:test,code:200,method:GET\n",
+		"traefik.backend.retries.total:2.000000|c|#service:test\n",
+		"traefik.request.duration:10000.000000|h|#service:test,code:200",
+	}
+
+	udp.ShouldReceiveAll(t, expected, func() {
+		datadogRegistry.ReqsCounter().With("service", "test", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet).Add(1)
+		datadogRegistry.ReqsCounter().With("service", "test", "code", strconv.Itoa(http.StatusNotFound), "method", http.MethodGet).Add(1)
+		datadogRegistry.ReqDurationHistogram().With("service", "test", "code", strconv.Itoa(http.StatusOK)).Observe(10000)
+		datadogRegistry.RetriesCounter().With("service", "test").Add(1)
+		datadogRegistry.RetriesCounter().With("service", "test").Add(1)
+	})
+}