adds event logging related to session events

Author: Chris Busbey

in_session.go

@@ -83,6 +83,7 @@ func (state inSession) Timeout(session *session, event event) (nextState session
 		testReq.Header.SetField(tagMsgType, FIXString("1"))
 		testReq.Body.SetField(tagTestReqID, FIXString("TEST"))
 		session.send(testReq)
+		session.log.OnEvent("Sent test request TEST")
 		session.peerTimer.Reset(time.Duration(int64(1.2 * float64(session.heartBeatTimeout))))
 		return pendingTimeout{}
 	}
@@ -173,7 +174,10 @@ func (state inSession) resendMessages(session *session, beginSeqNo, endSeqNo int
 		if seqNum != sentMessageSeqNum {
 			state.generateSequenceReset(session, seqNum, sentMessageSeqNum)
 		}
+
 		session.resend(msg)
+		session.log.OnEventf("Resending Message: %v", sentMessageSeqNum)
+
 		seqNum = sentMessageSeqNum + 1
 		nextSeqNum = seqNum
 	}
@@ -266,4 +270,6 @@ func (state *inSession) generateSequenceReset(session *session, beginSeqNo int,
 	//FIXME error check?
 	msgBytes, _ := sequenceReset.Build()
 	session.sendBytes(msgBytes)
+
+	session.log.OnEventf("Sent SequenceReset TO: %v", endSeqNo)
 }

session.go

@@ -127,6 +127,7 @@ func createSession(sessionID SessionID, storeFactory MessageStoreFactory, settin
 	session.stateTimer = eventTimer{Task: func() { session.sessionEvent <- needHeartbeat }}
 	session.peerTimer = eventTimer{Task: func() { session.sessionEvent <- peerTimeout }}
 	application.OnCreate(session.sessionID)
+	session.log.OnEvent("Created session")
 	sessions.newSession <- session
 
 	return nil
@@ -232,6 +233,8 @@ func (s *session) sendBytes(msg []byte) {
 }
 
 func (s *session) doTargetTooHigh(reject targetTooHigh) {
+	s.log.OnEventf("MsgSeqNum too high, expecting %v but received %v", reject.ExpectedTarget, reject.ReceivedTarget)
+
 	resend := NewMessage()
 	resend.Header.SetField(tagMsgType, FIXString("2"))
 	resend.Body.SetField(tagBeginSeqNo, FIXInt(reject.ExpectedTarget))
@@ -243,6 +246,8 @@ func (s *session) doTargetTooHigh(reject targetTooHigh) {
 	resend.Body.SetField(tagEndSeqNo, FIXInt(endSeqNum))
 
 	s.send(resend)
+
+	s.log.OnEventf("Sent ResendRequest FROM: %v TO: %v", reject.ExpectedTarget, endSeqNum)
 }
 
 func (s *session) verifyLogon(msg Message) MessageRejectError {