Direct proxy works

stats/stats_prometheus.go

@@ -0,0 +1,110 @@
+package stats
+
+import (
+	"net"
+	"net/http"
+
+	"github.com/juju/errors"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+
+	"github.com/9seconds/mtg/config"
+	"github.com/9seconds/mtg/conntypes"
+)
+
+type statsPrometheus struct {
+	connections *prometheus.GaugeVec
+	traffic     *prometheus.GaugeVec
+	crashes     prometheus.Gauge
+	antiReplays prometheus.Gauge
+}
+
+func (s *statsPrometheus) IngressTraffic(traffic int) {
+	s.traffic.WithLabelValues("ingress").Add(float64(traffic))
+}
+
+func (s *statsPrometheus) EgressTraffic(traffic int) {
+	s.traffic.WithLabelValues("egress").Add(float64(traffic))
+}
+
+func (s *statsPrometheus) ClientConnected(connectionType conntypes.ConnectionType, addr *net.TCPAddr) {
+	s.changeConnections(connectionType, addr, 1.0)
+}
+
+func (s *statsPrometheus) ClientDisconnected(connectionType conntypes.ConnectionType, addr *net.TCPAddr) {
+	s.changeConnections(connectionType, addr, -1.0)
+}
+
+func (s *statsPrometheus) changeConnections(connectionType conntypes.ConnectionType,
+	addr *net.TCPAddr,
+	increment float64) {
+	var labels [2]string
+
+	switch connectionType {
+	case conntypes.ConnectionTypeAbridged:
+		labels[0] = "abridged"
+	case conntypes.ConnectionTypeSecure:
+		labels[0] = "secured"
+	default:
+		labels[0] = "intermediate"
+	}
+
+	labels[1] = "ipv4"
+	if addr.IP.To4() == nil {
+		labels[1] = "ipv6"
+	}
+
+	s.connections.WithLabelValues(labels[:]...).Add(increment)
+}
+
+func (s *statsPrometheus) Crash() {
+	s.crashes.Inc()
+}
+
+func (s *statsPrometheus) AntiReplayDetected() {
+	s.antiReplays.Inc()
+}
+
+func newStatsPrometheus(mux *http.ServeMux) (Stats, error) {
+	registry := prometheus.NewRegistry()
+	instance := &statsPrometheus{
+		connections: prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: config.C.PrometheusStats.Prefix,
+			Name:      "connections",
+			Help:      "Current number of connections to the proxy.",
+		}, []string{"type", "protocol"}),
+		traffic: prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: config.C.PrometheusStats.Prefix,
+			Name:      "traffic",
+			Help:      "Traffic passed through the proxy in bytes.",
+		}, []string{"direction"}),
+		crashes: prometheus.NewGauge(prometheus.GaugeOpts{
+			Namespace: config.C.PrometheusStats.Prefix,
+			Name:      "crashes",
+			Help:      "How many crashes happened.",
+		}),
+		antiReplays: prometheus.NewGauge(prometheus.GaugeOpts{
+			Namespace: config.C.PrometheusStats.Prefix,
+			Name:      "anti_replays",
+			Help:      "How many anti replay attacks were prevented.",
+		}),
+	}
+
+	if err := registry.Register(instance.connections); err != nil {
+		return nil, errors.Annotate(err, "Cannot register metrics for connections")
+	}
+	if err := registry.Register(instance.traffic); err != nil {
+		return nil, errors.Annotate(err, "Cannot register metrics for traffic")
+	}
+	if err := registry.Register(instance.crashes); err != nil {
+		return nil, errors.Annotate(err, "Cannot register metrics for crashes")
+	}
+	if err := registry.Register(instance.antiReplays); err != nil {
+		return nil, errors.Annotate(err, "Cannot register metrics for anti replays")
+	}
+
+	handler := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
+	mux.Handle("/prometheus", handler)
+
+	return instance, nil
+}