move the RTTStats to the utils package

The RTTStats are used by the logging package. In order to instrument the
congestion package, the RTTStats can't be part of that package any more
(to avoid an import loop).

logging/interface.go

@@ -6,7 +6,8 @@ import (
 	"net"
 	"time"
 
-	"github.com/lucas-clemente/quic-go/internal/congestion"
+	"github.com/lucas-clemente/quic-go/internal/utils"
+
 	"github.com/lucas-clemente/quic-go/internal/protocol"
 	"github.com/lucas-clemente/quic-go/internal/qerr"
 	"github.com/lucas-clemente/quic-go/internal/wire"
@@ -49,7 +50,7 @@ type (
 	ApplicationError = qerr.ErrorCode
 
 	// The RTTStats contain statistics used by the congestion controller.
-	RTTStats = congestion.RTTStats
+	RTTStats = utils.RTTStats
 )
 
 const (

logging/mock_connection_tracer_test.go

@@ -5,13 +5,14 @@
 package logging
 
 import (
-	gomock "github.com/golang/mock/gomock"
-	congestion "github.com/lucas-clemente/quic-go/internal/congestion"
-	protocol "github.com/lucas-clemente/quic-go/internal/protocol"
-	wire "github.com/lucas-clemente/quic-go/internal/wire"
-	net "net"
-	reflect "reflect"
-	time "time"
+	"net"
+	"reflect"
+	"time"
+
+	"github.com/golang/mock/gomock"
+	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/utils"
+	"github.com/lucas-clemente/quic-go/internal/wire"
 )
 
 // MockConnectionTracer is a mock of ConnectionTracer interface
@@ -254,7 +255,7 @@ func (mr *MockConnectionTracerMockRecorder) UpdatedKeyFromTLS(arg0, arg1 interfa
 }
 
 // UpdatedMetrics mocks base method
-func (m *MockConnectionTracer) UpdatedMetrics(arg0 *congestion.RTTStats, arg1, arg2 protocol.ByteCount, arg3 int) {
+func (m *MockConnectionTracer) UpdatedMetrics(arg0 *utils.RTTStats, arg1, arg2 protocol.ByteCount, arg3 int) {
 	m.ctrl.T.Helper()
 	m.ctrl.Call(m, "UpdatedMetrics", arg0, arg1, arg2, arg3)
 }