Api gateway

Project Setup

• clone the project on your local machine
• Execute command npm install on the same path as of your root directory of the downloaded project

Use

• in our Airline management project we need to expose our service to outside the word , rather the exposing all service we expose single Endpoint for all service
• single endpoint validated all the service like authentication then forward to our actual service
• so it work like a proxy server in between our client and services

app.use('/bookingservice', async (req, res, next) => {
  console.log(req.headers['x-access-token']);
  try {
    const response = await axios.get(
      'http://localhost:3001/api/v1/isauthenticate',
      {
        headers: {
          'x-access-token': req.headers['x-access-token'],
        },
      }
    );
    if (response.data.success) {
      next();
    } else {
      return res.status(401).json({
        message: 'Unauthorized',
      });
    }
  } catch (error) {
    return res.status(401).json({
      message: 'Unauthorized',
    });
  }
});

• I created a middleware so first verify user then goto to next endpoint

app.use(
  '/bookingservice',
  createProxyMiddleware({ target: 'http://localhost:3002', changeOrigin: true })
);

• here i use http-proxy-middleware package it work like a proxy server so it forward our request to booking microservice
• we also set rate limit for demo purpose i only set 2 minute

const limiter = rateLimit({
  windowMs: 2 * 60 * 1000,
  max: 5,
});

• here i only created single endpoint , but we need to create all services endpoint like bookingservice

Microservices i Created

Flight Search Service Repo

AirTicket Booking Service

Auth Service

Reminder Service