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server.js
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server.js
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let express = require('express');
let path = require('path');
let fs = require('fs');
let MongoClient = require('mongodb').MongoClient;
let bodyParser = require('body-parser');
let app = express();
const DB_USER = process.env.MONGO_DB_USERNAME;
const DB_PASS = process.env.MONGO_DB_PWD;
let mongoClient = null;
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(bodyParser.json());
app.get('/', function (req, res) {
res.sendFile(path.join(__dirname, "index.html"));
});
// when starting app locally, use "mongodb://admin:password@localhost:27017" URL instead
let mongoUrlDockerCompose = `mongodb://${DB_USER}:${DB_PASS}@mongodb`;
// the following db and collection will be created on first connect
let databaseName = "my-db";
let collectionName = "my-collection";
app.get('/fetch-data', async function (req, res) {
let response = {};
let db = mongoClient.db(databaseName);
let myquery = { myid: 1 };
let result = null;
try {
result = await db.collection(collectionName).findOne(myquery);
response = result;
} catch (err) {
console.error('failed to findOne', err);
} finally {
res.send(response? response: {});
}
});
let server = app.listen(3000, async function () {
try {
mongoClient = await MongoClient.connect(mongoUrlDockerCompose);
console.log("app listening on port 3000!");
} catch (err) {
console.error(`failed to connect to ${mongoUrlDockerCompose}`, err)
throw err;
}
});
function gracefulShutdown() {
console.log('Shutting down gracefully');
server.close((err) => {
if (err != null) {
console.error('failed to close', err);
return err
}
mongoClient.close().then(() => {
console.log('Server closed');
process.exit(0);
}).catch(err => {
console.error('failed to close mongo connection', err);
})
})
// Force close after 5 seconds
setTimeout(() =>{
console.error('Couldn`t close in time, force to close');
process.exit(1);
}, 5000);
}
process.on('SIGTERM', gracefulShutdown);
process.on('SIGINT', gracefulShutdown);
process.on('uncaughtException', gracefulShutdown);
process.on('unhandledRejection', gracefulShutdown);