Express - 에러처리

 

 

에러처리

 

 

app.use(function(req, res, next) {
  res.status(404).send('Sorry cant find that!');
});
 

app.use(function (err, req, res, next) {
  console.error(err.stack)
  res.status(500).send('Something broke!')
});

위의 코드들을 맨 아래에 적용하면 에러 발생시 설정한 값이 뜨도록 설정할 수 있다.

 

 

 

main.js

const express = require('express')
const app = express()
const port = 3000
var fs = require('fs');
var qs = require('querystring');
var template = require('./lib/template.js');
var path = require('path');
var sanitizeHtml = require('sanitize-html');
var bodyParser = require('body-parser')

app.use(express.static('public'));
app.use(bodyParser.urlencoded({ extended: false }))
app.get('*', function(request, response, next){
  fs.readdir('./data', function(error, filelist){
    request.list = filelist;
    next();
  });
});

app.get('/', (request, response) => {
  
          var title = 'Welcome';
          var description = 'Hello, Node.js';
          var list = template.list(request.list);
          var html = template.HTML(title, list,
            `<h2>${title}</h2>${description}
 <img src="/image/블레이드 러너 2049 바탕화면.jpg " style="width:300px; display:block; margin-top:10px;">`,
                                   
            `<a href="/create">create</a>`
          );
         
          response.send(html);
        
});

app.get('/page/:pageId',(request, response, nest)=>{
    
          var filteredId = path.parse(request.params.pageId).base;
          fs.readFile(`data/${filteredId}`, 'utf8', function(err, description){
          //if문을 이용하여 err 발생시 next(err)를 통해 설정한 에러 메세지 등장하도록함.
            if(err){
             next(err);
    }       else {
          var title = request.params.pageId;
          var sanitizedTitle = sanitizeHtml(title);
          var sanitizedDescription =   sanitizeHtml(description, {
           allowedTags:['h1']
           });
           var list = template.list(request.list);
           var html = template.HTML(sanitizedTitle, list,
           `<h2>${sanitizedTitle}   </h2>${sanitizedDescription}`,
           ` <a href="/create">create</a>
           <a     href="/update/${sanitizedTitle}">update<   /a>
             <form action="/delete_process" method="post">
               <input type="hidden" name="id"    value="${sanitizedTitle}">
            <input type="submit" value="delete">
            </form>`
      );
      response.send(html);
    }
  });
});

app.get('/create', (request, response)=>{
    
        var title = 'WEB - create';
        var list = template.list(request.list);
        var html = template.HTML(title, list, `
          <form action="/create_process" method="post">
            <p><input type="text" name="title" placeholder="title"></p>
            <p>
              <textarea name="description" placeholder="description"></textarea>
            </p>
            <p>
              <input type="submit">
            </p>
          </form>
        `, '');
        response.send(html);
      
});

app.post('/create_process', (request, response)=>{
       var post = request.body;
       var title = post.title;
       var description = post.description;
    fs.writeFile(`data/${title}`, description, 'utf8', function(err){
     response.writeHead(302, {Location: `/? id=${title}`});
     response.end();
  });
});
    


app.get('/update/:pageId', (request, response)=>{
  
        var filteredId = path.parse(request.params.pageId).base;
        fs.readFile(`data/${filteredId}`, 'utf8', function(err, description){
          var title = request.params.pageId;
          var list = template.list(request.list);
          var html = template.HTML(title, list,
            `
            <form action="/update_process" method="post">
              <input type="hidden" name="id" value="${title}">
              <p><input type="text" name="title" placeholder="title" value="${title}"></p>
              <p>
                <textarea name="description" placeholder="description">${description}</textarea>
              </p>
              <p>
                <input type="submit">
              </p>
            </form>
            `,
            `<a href="/create">create</a> <a href="/update?id=${title}">update</a>`
          );
          response.send(html);
        });
        
});

app.post('/update_process', (request, response)=>{
     var post = request.body;
     var id = post.id;
     var title = post.title;
     var description = post.description;
     fs.rename(`data/${id}`, `data/${title}`,  function(error){
     fs.writeFile(`data/${title}`, description, 'utf8', function(err){
      response.redirect(`/?id=${title}`);
    })
  });
});
  
         
app.post('/delete_process', (request, response)=>{
    var post = request.body;
    var id = post.id;
    var filteredId = path.parse(id).base;
    fs.unlink(`data/${filteredId}`, function(error){
    response.redirect('/');
  });
});

//에러 메세지 적용
app.use(function(req, res, next) {
  res.status(404).send('Sorry cant find that!');
});
 
//에러 메세지 적용
app.use(function (err, req, res, next) {
  console.error(err.stack)
  res.status(500).send('Something broke!')
});
   

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`)
})