# post 호출시, body에 {test:'hello"} 를 함께 전송

#router 소스
router.post('/', (req, res) => {
  console.log(req.body); undefined 발생
  res.redirect('/');
});

# body-parser 설치
$> npm install --save body-parser

#app.js 소스
const express = require('express');
const bodyParser = require('body-parser');

const app = express();
app.use(bodyParser().json()); //bodyparser 사용 설정

const bodyParser = require('body-parser');
app.use(bodyParser.json({limit: '50mb'})); //body 의 크기 설정
app.use(bodyParser.urlencoded({limit: '50mb', extended: true})); //url의 크기 설정

const express = require('express')
const app = express();
app.use(express.json())
app.post('/', (req, res) => {
  console.log(req.body)
})

# -i 옵션이 cluster 모드이며, max는 사용할 CPU 수를 입력 하면 된다.
# 0을 입력하면, 자동으로 모든 CPU 숫자만큼 클러스터가 생성된다.
pm2 start app.js -i max

{
  "apps" : [{
    "script"    : "api.js",
    "instances" : "max",
    "exec_mode" : "cluster" 
  }]
}

app.get('*', (req, res) => {
  res.sendFile(`${__dirname}/public/index.html`);
});

var appRoot = require('app-root-path');
var winston = require('winston');

// define the custom settings for each transport (file, console)
var options = {
  file: {
    level: 'info',
    filename: `${appRoot}/logs/app.log`,
    handleExceptions: true,
    json: true,
    maxsize: 5242880, // 5MB
    maxFiles: 5,
    colorize: false,
  },
  console: {
    level: 'debug',
    handleExceptions: true,
    json: false,
    colorize: true,
  },
};

// instantiate a winston.createLogger with the settings defined above
var logger = winston.createLogger({
  transports: [
    new winston.transports.File(options.file),
    new winston.transports.Console(options.console)
  ],
  exitOnError: false, // do not exit on handled exceptions
});

// create a stream object with a 'write' function that will be used by `morgan`
logger.stream = {
  write: function(message, encoding) {
    // use the 'info' log level so the output will be picked up by both transports (file and console)
    logger.info(message);
  },
};

module.exports = logger;

#1 
var appRoot = require('app-root-path');
var myModule = require(appRoot + '/lib/my-module.js');

#2
var reqlib = require('app-root-path').require;
var myModule = reqlib('/lib/my-module.js');

#3
// In app.js
global.reqlib = require('app-root-path').require;
 
// In lib/module/component/subcomponent.js
var myModule = reqlib('/lib/my-module.js');

#4
var myModulePath = require('app-root-path').resolve('/lib/my-module.js');

const __DEFAULT_SELECTBOX_STR = "선택해주세요";
const __ORDER_SELECT_BOX = ['cls-l', 'cls-m', 'cls-s', 'cls-d'];

const removeAllOptions = (isRemove, target) => {
    if(isRemove){
        target.find('option').remove();
        target.append(new Option(__DEFAULT_SELECTBOX_STR, ""));
    }
}

const resetSubSelectBoxOption = (target_id) => {
    let target_obj;
    let isResetSelectBox = false;
    __ORDER_SELECT_BOX.forEach(v => {
        target_obj = $("#"+v);
        if(v === target_id){
            isResetSelectBox = true;
        }
        removeAllOptions(isResetSelectBox, target_obj);
    });
}

const setClassification = (target, val, level) => {
    callClassification({'upper_prd_cls_cd' : val, 'cls_lvl_no' : level}, (res)=>{
        res.forEach(element => {
            target.append(new Option(element.PRD_CLS_NM, element.PRD_CLS_CD));
        });
    }); 
}

const setSubSelectBoxOption = ($target, val, level) => {
    resetSubSelectBoxOption($target.attr("id"));
    if (val === "") return;
    setClassification($target, val, level);
}

const setInitValue4SelectBox = (target, i) => {
    removeAllOptions(true, target);
    if (i === 0){
        setClassification(target, "", 1);
    }
}

const bindEventOnSelectBox = (target, i) => {
    if (i !== (__ORDER_SELECT_BOX.length-1)) {
        target.change(function() {
            setSubSelectBoxOption($("#"+__ORDER_SELECT_BOX[i+1]), $(this).val(), (i+2));
        });
    }
}

const initSelectBox = () => {
    __ORDER_SELECT_BOX.forEach((o, i) => {
        let target = $("#"+o);
        setInitValue4SelectBox(target, i);
        bindEventOnSelectBox(target, i);
    });  
    
}

$(document).ready(function() {
    initSelectBox();  
});

> node ./bin/www
ORA-21561: OID generation failed

echo "127.0.0.1 $(hostname)" | sudo tee -a /etc/hosts

> node ./bin/www
Connection was successful!

$> npm install
.... 모듈 오류 발생 ...

# 설치 
$>sudo  npm install -g n

# Node 버전 중 설치된 버전 확인
$> n ls  

# Node 버전 설치  
$> n <version>  
# ex> n 8.13

# 최신 LTS Node 버전 설치
$> n latest  

# 제거할 Node 설정
$ n rm <version ...>  
#ex> n rm 8.9.1 8.9.2

# 현재 버전을 제외한 모든 버전 제거
$ n prune  

//app.js
// global.변수명 = 사용하려는 변수명
let running = false;
global.running = running;


//test.js
//이후 다른 js에서 다음과 같이 사용 하면된다.
console.log(running);
running = false;
console.log(running);

# test.js
module.exports = {running: true}

# app.js
let test = require('test.js');
test.running = false;
console.log(test.running);