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server.js
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server.js
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const mongoose = require('mongoose');
const dotenv = require('dotenv');
dotenv.config({ path: './config.env' });
// to link our config file with our application. This will basically read the variables defined in our config file and save them as the node environment variables.
// we need to configure the environment variables before we require app.js
process.on('uncaughtException', (error) => {
console.log('UNCAUGHT EXCEPTION!');
console.log(error.name, error.message);
process.exit(1);
});
const app = require('./app');
// console.log(app.get('env')); // to get the environment that we're currently in.
// console.log(process.env); // contains the different environment variables.
const DB = process.env.DATABASE.replace(
'<PASSWORD>',
process.env.DATABASE_PASSWORD
);
mongoose
.connect(DB, {
useNewUrlParser: true,
useCreateIndex: true,
useFindAndModify: false,
useUnifiedTopology: true,
// we need to pass in this object to deal with some deprecation warnings. mongoose.connect() returns a promise, so we can use then() and catch().
})
.then(() => console.log('DB connection successful!'));
// 4: START SERVER
const port = process.env.PORT;
const server = app.listen(port, () => {
console.log(`App running on port ${port}...`);
});
process.on('unhandledRejection', (error) => {
console.log('error due to unhandled rejection', error.name, error.message);
console.log('UNHANDLED EXCEPTION! SHUTTING DOWN...');
server.close(() => {
process.exit(1);
});
// 0 for success, 1 for uncaught expection
// however, process.exit() is not a good way to exit out of our program, as it abruptly shuts down everything. We need to shut down gracefully. First we exit the server, then the application.
});