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app.js
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app.js
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var createError = require('http-errors');
var express = require('express');
const mongoose = require('mongoose');
const dotenv = require('dotenv');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var dgram = require('dgram'); // Add the dgram module
const WeatherData = require('./models/weather');
const rainEventData = require('./models/rainEvent');
const { fetchRainEvents, fetchWeatherData } = require('./controllers/weatherService');
// SETTINGS:
const DELAY_IN_MINUTES = 30; // current delay for pumpDelayHandler (in minutes)
// Load environment variables from .env file
dotenv.config();
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var weatherRouter = require('./routes/weather');
var app = express();
// Define ESP connection details
const UDP_HOST = '192.168.137.220';
const UDP_PORT = 4210;
// Function to send UDP commands
function sendUdpCommand(command) {
const message = Buffer.from(command);
const client = dgram.createSocket('udp4');
client.send(message, UDP_PORT, UDP_HOST, (err) => {
client.close();
if (err) {
console.error(`Failed to send command: ${command}`, err);
} else {
console.log(`Command sent: ${command}`);
}
});
}
const pumpDelayHandler = async () => {
const rainEvents = await fetchRainEvents();
// Find next rain event within 1 hour
const nextRainEvent = rainEvents.find(event => {
const timeDiff = event.time - Date.now();
return timeDiff > 0 && timeDiff <= 3600000; // Within 1 hour
});
// Upcoming rain event:
console.log(nextRainEvent)
if (nextRainEvent) {
console.log(nextRainEvent)
await rainEventData.deleteOne({ time: nextRainEvent.time });
const message = `DELAY_${nextRainEvent.duration}`;
sendUdpCommand(message);
// Remove the nextRainEvent from the database
}
};
// Schedule the event listener to run
// current delay (in minutes) = DELAY_IN_MINUTES
setInterval(pumpDelayHandler, 1000 * 60 * DELAY_IN_MINUTES)
// MongoDB connection
mongoose.connect(process.env.MONGODB_URI)
.then(() => console.log('Connected to MongoDB'))
.catch(err => console.error('Faild to connect to MongoDB', err));
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
// Middleware to parse JSON bodies
app.use(express.json());
app.use(logger('dev'));
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
// Home routeq
app.use('/', indexRouter);
// Routes
app.use('/users', usersRouter);
app.use('/weather', weatherRouter);
// Endpoint to handle commands from the front end
app.post('/send-command', (req, res) => {
const { command } = req.body;
if (command) {
sendUdpCommand(command, res);
} else {
res.status(400).send('No command provided');
}
});
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;