server.js

const mongoose = require("mongoose");
const dotenv = require("dotenv");

process.on("uncaughtException", (err) => {
  console.log("UNHANDLED EXCEPTION! Shutting down...");
  console.log(err);
  console.log(err.name, err.message);
  process.exit(1);
});

dotenv.config({ path: "./config.env" });

const app = require("./app");

// console.log(process.env);
const DB = process.env.DATABASE.replace(
  "<PASSWORD>",
  process.env.DATABASE_PASSWORD
);

mongoose
  .connect(DB, {
    // to avoid deprecation
    useNewUrlParser: true,
    useCreateIndex: true,
    useFindAndModify: false,
    useUnifiedTopology: true,
  })
  .then(() => {
    console.log("DB connection successful");
  });

const port = process.env.PORT || 3000;
const server = app.listen(port, () => {
  console.log(`App running on port ${port}...`);
});

// global unhandled rejections handler
process.on("unhandledRejection", (err) => {
  console.log("UNHANDLED REJECTION! Shutting down...");
  console.log(err.name, err.message);
  server.close(() => {
    process.exit(1);
  });
});

// Sick term is an event that emitted by heroku to restart the app every 24h
// So we need to respond to it. (like the unhandled rejection above)
process.on("SIGTERM", () => {
  console.log("SIGTERM RECEIVED. Shutting down gracefully!");
  server.close(() => {
    console.log("Process terminated");
  });
});

// TESTING MODELS
// const testTour = new Tour({
//   name: "The Park Camper",
//   // rating: 4.7,
//   price: 997,
// });

// testTour
//   .save()
//   .then((doc) => {
//     console.log(doc);
//   })
//   .catch((err) => {
//     console.log(err);
//   });