state needs to be in memory for access

chatSession.go

 	UpdateAt  int32             `json:"UpdateAt"`  //when is this session updated
 	Expire    int32             `json:"Expire"`    //unix timestamp of when this Procedure expires
 	KvPair    map[string]string `json:"KvPair"`    //key value pair persistant for this session
+	//
+	//
+	//current state for the prcedure
+	state chatState
 }
 
 func writeSession(ss openIDSessionData) (err error) {
 	c.KvPair[key] = val
 	c.UpdateAt = int32(time.Now().Unix())
 }
+
+//main entry point for processing each incoming message
+//this stage has session date available
+func (c *openIDSessionData) incomingMsg(v InWechatMsg) {
+	openID := v.header.FromUserName
+	//are we in an existing procedure
+	inProc, state := isInProc(openID) //if inside a procedure, resume last saved state
+	if inProc {
+		c.state = serveProc(state, v) //transit to new state
+	} else {
+		state, processed := serveCommand(openID, v) //menu or txt command e.g. search
+		if !processed {                             // transfer to Customer Service (kf)
+			kfSendTxt(openID, "未识别的命令，已转接校友会理事会，稍后答复您")
+		}
+		c.state = state
+	}
+
+	if !isEndingState(state) {
+		err := saveChatState(openID, state.Procedure, state)
+		if err != nil {
+			log.Println("Error Cannot Save chat sate")
+			log.Println(err)
+			log.Println(state)
+		}
+	} else { //state ending
+		cleanProcedure(openID, state.Procedure)
+	}
+	return
+}