Use Callback function

@@ -29,7 +29,7 @@ app.get("/webhook", function (req, res) {
 // Creates the endpoint for our webhook
 app.post('/webhook', (req, res) => {
 
-  let body = req.body;
+  var body = req.body;
 
   if (body.object === 'page') {
 
@@ -38,11 +38,11 @@ app.post('/webhook', (req, res) => {
 
       // Gets the message. entry.messaging is an array, but
       // will only ever contain one message, so we get index 0
-      let webhook_event = entry.messaging[0];
+      var webhook_event = entry.messaging[0];
       console.log(webhook_event);
 
       // Get the sender PSID
-      let sender_psid = webhook_event.sender.id;
+      var sender_psid = webhook_event.sender.id;
       console.log('Sender PSID: ' + sender_psid);
       
 
@@ -63,4 +63,3 @@ app.post('/webhook', (req, res) => {
   }
 });
 
-

-let request = require('request'),
-    template = require('./template');
+var request = require('request');
+var template = require('./template.js');
 
-// Handles message events
-exports.handleMessage = (sender_psid, received_message) => {
-  let response; 
-  if(received_message.text === "처음으로"){
-    response = template.goToGreetTemplate(received_message);
+exports.handleMessage=function(sender_psid, received_message) {
+  var response; 
+  var text = received_message.text;
+
+  if(text === "처음으로"){
+    template.greetingTemplate(function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
+    callSendAPI(sender_psid, response);
   }else{
-    response = template.choiceLectProfTemplate(received_message);
+    template.choiceLectProfTemplate(text, function(result, res){
+      if(result==true){
+        response=res;
+      }
+    });
   }
   callSendAPI(sender_psid, response);
 }
 
-exports.handlePostback = (sender_psid, received_postback) => {
-  let response;
+exports.handlePostback =function(sender_psid, received_postback) {
+  var response;
 
   // Get the payload for the postback
-  let payload = received_postback.payload;
+  var payload = received_postback.payload;
+  var firstchoice = payload.substr(0,14);
 
   // Set the response based on the postback payload
   if(payload === 'Greeting'){
-	  response = template.greetingTemplate();
+    console.log('Greeting');
+	  template.greetingTemplate(function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
 	  callSendAPI(sender_psid, response);
-  }else if(payload.substr(0,14)=== 'CHOICE_BY_PROF'){
+  }else if(firstchoice === 'CHOICE_BY_PROF'){
 	  handlePostback_choiceByProf(sender_psid, received_postback);
-  }else if(payload.substr(0,14)=== 'CHOICE_BY_LECT'){
-	  handlePostback_choiceByLect(sender_psid, recieved_postback);
-  }else if(payload.substr(0,14) ==='CHOICE_BY_HELP'){
-	  handlePostback_help(sender_psid, recieved_postback);
+  }else if(firstchoice === 'CHOICE_BY_LECT'){
+	  handlePostback_choiceByLect(sender_psid, received_postback);
+  }else if(firstchoice === 'CHOICE_BY_HELP'){
+	  handlePostback_help(sender_psid, received_postback);
   }else if(payload.substr(0,8) === 'MoreRate'){
-    response = template.moreRateTemplate(received_postback);
+    template.moreRateTemplate(payload, function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
     callSendAPI(sender_psid, response);
   }
 }
 
-const handlePostback_choiceByProf = (sender_psid, received) => {
-  let response;
-
-  let stat = received.payload.substr(14,6);
+const handlePostback_choiceByProf = function(sender_psid, received){
+  var response;
+  var payload = received.payload;
+  var stat = payload.substr(14,6);
 
   if(stat === 'stat_0'){
-	  response = template.getProfNameTemplate(received);
+	  template.getProfNameTemplate(function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }else if(stat === 'stat_2'){
-    response = template.moreProfTemplate(received);
+    template.moreProfTemplate(payload,function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }else if(stat === 'stat_3'){
-    response = template.rateTemplate(received);
+    template.rateTemplate(payload,function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }
   callSendAPI(sender_psid, response);
 }
 
-const handlePostback_choiceByLect = (sender_psid, recieved) => {
-  let response;
-
-  let stat = recieved.payload.substr(14,6);
+const handlePostback_choiceByLect = function(sender_psid, received){
+  var response;
+  var payload = received.payload;
+  var stat = payload.substr(14,6);
 
   if(stat === 'stat_0'){
-	  response = template.getLectNameTemplate(received);
+    template.getLectNameTemplate(function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }else if(stat === 'stat_2'){
-	  response = template.moreLectTemplate(received);
+    template.moreLectTemplate(payload,function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }else if(stat === 'stat_3'){
-	  response = template.rateTemplate(received);
+    template.rateTemplate(payload,function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }
   callSendAPI(sender_psid, response);
 }
 
-const handlePostback_help = (sender_psid, received) => {
-  let response;
-
-  let stat = received.payload.substr(14);
+const handlePostback_help = function(sender_psid, received) {
+  var response;
+  var payload = received.payload;
+  var stat = payload.substr(14,6);
 
   if(stat === 'stat_0'){
-	  response = template.howToTemplate(received);
+	  template.howToTemplate(function(result, res){
+      if(result==true){
+        console.log(res);
+        response=res;
+      }
+    });
   }
   callSendAPI(sender_psid, response);
 }
 
 // Sends response messages via the Send API
-const callSendAPI = (sender_psid, response, cb = null) => {
+const callSendAPI = (sender_psid, response, cb=null) => {
   console.log('response:'+response);
   // Send the HTTP request to the Messenger Platform
   request({
@@ -88,7 +146,9 @@ const callSendAPI = (sender_psid, response, cb = null) => {
 	    message: response
     }
   }, (err, res, body) => {
-    if (err) {
+    if (!err) {
+      console.log('message sent!')
+    } else {
       console.error("Unable to send message:" + err);
     }
   });

-const mysql = require('mysql');
-const db_config = require('./config/db-config.json');
-
-let db;
-function connectDB() {
-    if (!db) {
-        db = mysql.createConnection(db_config);
-        db.connect(function(err) {
-            if (!err) {
-                console.log('Database is connected');
-            } else {
-                console.log('Error: ', err);
-            }
-        });
-    }
-
-    return db;
-}
-
-module.exports = connectDB();