chatbot 에서 일정 시간간격으로 거래 정보를 push하는 기능 추가

+const request = require('request');
+const TARGET_URL = 'https://api.line.me/v2/bot/message/push'
+const MULTI_TARGET_URL = 'https://api.line.me/v2/bot/message/multicast'
+const BROAD_TARGET_URL = 'https://api.line.me/v2/bot/message/broadcast'
+const TOKEN = ''//Token, userid 입력후 사용
+const USER_ID = '' 
+
+const express = require('express');
+const app = express();
+const fetch = require('node-fetch');
+const fs_apikey = require('fs');
+const api_key = fs_apikey.readFileSync('apikey', 'ascii')
+var cursor = ''
+url2 = 'https://api.whale-alert.io/v1/transactions?api_key=' + api_key + '&cursor=' + cursor;
+const options = {method: 'GET', headers: {Accept: 'application/json'}};
+
+var TimeNow = parseInt((new Date()).getTime() / 1000)
+var uts2time = new Date()
+
+console.log(TimeNow)
+fetch(url2, options) //커서값(갱신)을 얻기 위한 fetch
+.then(res => res.json())
+.then(json => {
+    console.log(json)
+    cursor = json.cursor
+})
+.catch((err) => {
+    console.log('error : inital_fetch:'+err)
+})
+function chk_param(data, query_limit, callback){
+    //query_limit (non_int) => return 0;
+    //query_limit (int) => return query_limit;
+    query_limit = parseInt(query_limit)
+    if(isNaN(query_limit)){ return callback(data, 0)} 
+    else {return callback(data, query_limit)}
+}
+function data_collector(data, limit){
+    var ret = new Array();
+    var str = '';
+
+    //ret += '# of Transactions : ' + data.count + '\n'
+    for(var i = 0; i < data.count; i++){
+        uts2time.setTime(data.transactions[i].timestamp * 1000)
+        str = /*'#' + (i+1)+*/'Time: ' + uts2time.toLocaleString() + '\nChainName: '+data.transactions[i].blockchain+'\nAmount: '+data.transactions[i].amount+' USD'
+        if(data.transactions[i].amount > limit){ 
+            //console.log(str)
+           // ret += '\n\n' + str;
+           o ={ 'type' : 'text',//message 형태에 맞춰 저장
+                'text' : str}
+           ret.push(o)
+        }
+        else{
+            //console.log(str)
+        }
+    }
+    return ret;
+}
+//5초 간격으로 fetch후 메시지 전송
+setInterval(() => {
+    fetch(url2+cursor, options)
+    .then(res => res.json())
+    .then(json => {
+            //API usage limit
+        console.log(json)
+        if(json.result == 'error'){
+        }
+        else{
+            cursor = json.cursor 
+            var msg2user = chk_param(json, 0, data_collector) //fetch후 message Object 배열 리턴
+            console.log('msg',msg2user)
+            if(msg2user.length){
+                var i = 0;
+                for(i; i < msg2user.length; i++){
+                    request.post(
+                        {
+                            url: TARGET_URL,
+                            headers: {
+                                'Authorization': `Bearer ${TOKEN}`
+                            },
+                            json: {
+                                "to": `${USER_ID}`,
+                                "messages":[msg2user[i]] //5개 초과하면 err나서 하나씩 넣음
+                            }
+                        },(error, response, body) => {
+                            console.log(body, error)
+                        });
+                    }
+                }
+        }
+    })
+    .catch(err => {
+        console.error('error: var:fu:' + err)
+    })
+}, 5000);
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