Include reason in text field of Logout if seq num too low in Logon.

logon_state.go

@@ -24,23 +24,15 @@ func (s logonState) FixMsgIn(session *session, msg *Message) (nextState sessionS
 	if err := session.handleLogon(msg); err != nil {
 		switch err := err.(type) {
 		case RejectLogon:
-			session.log.OnEvent(err.Text)
-			logout := session.buildLogout(err.Text)
+			return shutdownWithReason(session, msg, true, err.Error())
 
-			if err := session.dropAndSendInReplyTo(logout, msg); err != nil {
-				session.logError(err)
-			}
-
-			if err := session.store.IncrNextTargetMsgSeqNum(); err != nil {
-				session.logError(err)
-			}
-
-			return latentState{}
+		case targetTooLow:
+			return shutdownWithReason(session, msg, false, err.Error())
 
 		case targetTooHigh:
 			var tooHighErr error
 			if nextState, tooHighErr = session.doTargetTooHigh(err); tooHighErr != nil {
-				return handleStateError(session, tooHighErr)
+				return shutdownWithReason(session, msg, false, tooHighErr.Error())
 			}
 
 			return
@@ -64,3 +56,20 @@ func (s logonState) Timeout(session *session, e internal.Event) (nextState sessi
 func (s logonState) Stop(session *session) (nextState sessionState) {
 	return latentState{}
 }
+
+func shutdownWithReason(session *session, msg *Message, incrNextTargetMsgSeqNum bool, reason string) (nextState sessionState) {
+	session.log.OnEvent(reason)
+	logout := session.buildLogout(reason)
+
+	if err := session.dropAndSendInReplyTo(logout, msg); err != nil {
+		session.logError(err)
+	}
+
+	if incrNextTargetMsgSeqNum {
+		if err := session.store.IncrNextTargetMsgSeqNum(); err != nil {
+			session.logError(err)
+		}
+	}
+
+	return latentState{}
+}

logon_state_test.go

@@ -302,3 +302,31 @@ func (s *LogonStateTestSuite) TestFixMsgInLogonSeqNumTooHigh() {
 	s.State(inSession{})
 	s.NextTargetMsgSeqNum(7)
 }
+
+func (s *LogonStateTestSuite) TestFixMsgInLogonSeqNumTooLow() {
+	s.IncrNextSenderMsgSeqNum()
+	s.IncrNextTargetMsgSeqNum()
+
+	logon := s.Logon()
+	logon.Body.SetField(tagHeartBtInt, FIXInt(32))
+	logon.Header.SetInt(tagMsgSeqNum, 1)
+
+	s.MockApp.On("ToAdmin")
+	s.NextTargetMsgSeqNum(2)
+	s.fixMsgIn(s.session, logon)
+
+	s.State(latentState{})
+	s.NextTargetMsgSeqNum(2)
+
+	s.MockApp.AssertNumberOfCalls(s.T(), "ToAdmin", 1)
+	msgBytesSent, ok := s.Receiver.LastMessage()
+	s.Require().True(ok)
+	sentMessage := NewMessage()
+	err := ParseMessage(sentMessage, bytes.NewBuffer(msgBytesSent))
+	s.Require().Nil(err)
+	s.MessageType(string(msgTypeLogout), sentMessage)
+
+	s.session.sendQueued()
+	s.MessageType(string(msgTypeLogout), s.MockApp.lastToAdmin)
+	s.FieldEquals(tagText, "MsgSeqNum too low, expecting 2 but received 1", s.MockApp.lastToAdmin.Body)
+}