Count accepted gRPC connections

1 files changed, 39 insertions, 0 deletions

diff --git a/internal/connectioncounter/connectioncounter.go b/internal/connectioncounter/connectioncounter.go
new file mode 100644
index 000000000..21e28cf1b
--- /dev/null
+++ b/internal/connectioncounter/connectioncounter.go
@@ -0,0 +1,39 @@
+package connectioncounter
+
+import (
+	"net"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	connTotal = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "gitaly_connections_total",
+			Help: "Total number of connections accepted by this Gitaly process",
+		},
+		[]string{"type"},
+	)
+)
+
+func init() {
+	prometheus.MustRegister(connTotal)
+}
+
+func New(cType string, l net.Listener) net.Listener {
+	return &countingListener{
+		cType:    cType,
+		Listener: l,
+	}
+}
+
+type countingListener struct {
+	net.Listener
+	cType string
+}
+
+func (cl *countingListener) Accept() (net.Conn, error) {
+	conn, err := cl.Listener.Accept()
+	connTotal.WithLabelValues(cl.cType).Inc()
+	return conn, err
+}