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led-server.js
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led-server.js
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const express = require('express');
const exec = require('child_process').exec;
const bodyParser = require('body-parser');
const Blinkt = require('node-blinkt')
// Blinkt API.
const app = express();
const blinkt = new Blinkt();
let LEDs = [];
let runPreset = false;
let currentPreset = 0;
const presets = [
{
name: 'cylon',
timer: null,
method: () => {
const scaler = 1 / 8;
const pauseLength = 5;
let currentIndex = 1;
let direction = 1;
let pauseCount = 0;
let cylonList = [1, 0, 0, 0, 0, 0, 0, 0];
for (let index = 0; index < 8; index += 1) {
blinkt.setPixel(index, 255, 0, 0, 0);
cylonList.push(1 - ((1 / 8) * index));
}
const updateCylon = () => {
// Reduce the amount in each index by the scalar, except
// for the currentLED, which should be set to 1.
for (let index = 0; index < 8; index += 1) {
if (currentIndex === index) {
cylonList[index] = 1;
} else {
if (cylonList[index] > 0) {
cylonList[index] -= scaler;
}
}
blinkt.setBrightness(index, cylonList[index]);
}
blinkt.sendUpdate();
if (pauseCount > 0) {
pauseCount -= 1;
} else {
currentIndex += direction;
}
if (currentIndex > 7) {
direction = -1;
currentIndex = 7;
pauseCount = 5;
} else if (currentIndex < 0) {
direction = 1;
currentIndex = 0;
pauseCount = 5;
}
if (runPreset) {
presets[currentPreset].timer = setTimeout(() => {
updateCylon();
}, 100);
}
};
updateCylon();
},
},
{
name: 'memory',
timer: null,
method: () => {
// Get the amount of memory we have and how much is free
exec('cat /proc/meminfo', function (err, out) {
if (!err) {
let matchTotal = out.match(/MemTotal:\s+([0-9]+)/);
let matchFree = out.match(/MemAvailable:\s+([0-9]+)/);
const total = parseInt(matchTotal[1], 10);
const free = parseInt(matchFree[1], 10);;
const numFreeLEDs = Math.floor((free / total * 8));
for (let index = 0; index < numFreeLEDs; index += 1) {
blinkt.setPixel(index, 0, 255, 0, 255);
}
for (let index = numFreeLEDs; index < 8; index += 1) {
blinkt.setPixel(index, 255, 0, 0, 255);
}
blinkt.sendUpdate();
}
if (runPreset) {
presets[currentPreset].timer = setTimeout(() => {
presets[currentPreset].method();
}, 1000);
}
});
}
}
];
function setLEDs () {
for (let index = 0; index < 8; index += 1) {
if (LEDs[index]) {
blinkt.setBrightness(index, 1.0);
} else {
blinkt.setBrightness(index, 0.0);
}
blinkt.sendUpdate();
}
}
// Setup blinkt
blinkt.setup();
for (let index = 0; index < 8; index += 1) {
LEDs.push(false);
}
setLEDs();
// Initialise Express
app.use(express.static(__dirname + '/public'));
app.use('/public/js', express.static(__dirname + '/public/js'));
app.use('/node_modules', express.static(__dirname + '/node_modules'));
app.use(bodyParser.json());
app.use(bodyParser.json({ type: 'application/vnd.api+json' }));
// Set up routes.
app.get('/', function (req, res) {
res.sendFile('./public/index.html');
});
app.get('/leds', function (req, res) {
// Send back the current LED status.
let results = [];
for (let led = 0; led < 8; led += 1) {
results.push({ id: led, value: LEDs[led] });
}
res.send(results);
});
app.post('/leds/:id', function (req, res) {
const params = req.params;
// Stop any presets.
if (runPreset) {
runPreset = false;
clearTimeout(presets[currentPreset].timer);
blinkt.clearAll();
}
// Update LEDs
LEDs[req.params.id] = !LEDs[req.params.id];
setLEDs();
res.sendStatus(200);
});
app.get('/presets', function (req, res) {
// Inefficient as it sends the method back, but anyway...
res.send(presets);
});
app.post('/presets/:name', function (req, res) {
const name = req.params.name;
// Stop any presets.
runPreset = false;
clearTimeout(presets[currentPreset].timer);
// If the name exists, start the appropriate preset running.
for (let index = 0; index < presets.length; index += 1) {
if (name === presets[index].name) {
runPreset = true;
currentPreset = index;
presets[index].method();
break;
}
}
res.sendStatus(200);
});
// Start server on port 80
const server = app.listen(80, function () {
var port = server.address().port;
console.log('LED server listening');
});