p2p: fix setting in con-tracker (#8370) (#8371)

(cherry picked from commit 8893411)

internal/p2p/conn_tracker.go

@@ -26,6 +26,7 @@ func newConnTracker(max uint, window time.Duration) connectionTracker {
 		cache:       make(map[string]uint),
 		lastConnect: make(map[string]time.Time),
 		max:         max,
+		window:      window,
 	}
 }
 
@@ -43,7 +44,7 @@ func (rat *connTrackerImpl) AddConn(addr net.IP) error {
 	if num := rat.cache[address]; num >= rat.max {
 		return fmt.Errorf("%q has %d connections [max=%d]", address, num, rat.max)
 	} else if num == 0 {
-		// if there is already at least connection, check to
+		// if there is already at least one connection, check to
 		// see if it was established before within the window,
 		// and error if so.
 		if last := rat.lastConnect[address]; time.Since(last) < rat.window {

internal/p2p/conn_tracker_test.go

@@ -70,4 +70,15 @@ func TestConnTracker(t *testing.T) {
 		}
 		require.Equal(t, 10, ct.Len())
 	})
+	t.Run("Window", func(t *testing.T) {
+		const window = 100 * time.Millisecond
+		ct := newConnTracker(10, window)
+		ip := randLocalIPv4()
+		require.NoError(t, ct.AddConn(ip))
+		ct.RemoveConn(ip)
+		require.Error(t, ct.AddConn(ip))
+		time.Sleep(window)
+		require.NoError(t, ct.AddConn(ip))
+	})
+
 }