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server.js
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server.js
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//
const //imports
express = require("express"),
app = express(),
EventEmitter = require("eventemitter3"),
fetch = require("node-fetch"),
cheerio = require("cheerio");
//config emitter
const emitter = new EventEmitter();
app.get("/events", (req, res) => {
console.log("New client");
res.writeHead(200, {
"Content-Type": "text/event-stream",
"Cache-Control": "no-cache",
Connection: "keep-alive"
});
// Heartbeat
const nln = () => {
res.write("\n");
};
const hbt = setInterval(nln, 15000);
const onEvent = data => {
res.write("retry: 500\n");
res.write(`event: event\n`);
res.write(`data: ${JSON.stringify(data)}\n\n`);
};
emitter.on("event", onEvent);
// Clear heartbeat and listener
req.on("close", () => {
console.log("Client disconnected");
clearInterval(hbt);
emitter.removeListener("event", onEvent);
});
});
app.get("/init", (req, res) => {
res.json(count.infected-count.recovered);
});
const count = {
infected: 0,
dead: 0,
recovered: 0
};
const getCount = () => {
const oldCount = count;
fetch("https://www.worldometers.info/coronavirus/")
.then(res => res.text())
.then(raw => {
const $ = cheerio.load(raw);
let i = 0;
for (const valRaw of Array.from($(".maincounter-number").children())) {
i++;
const val = valRaw.children[0].data.replace(/[^\d]/gi, "").trim();
switch (i) {
case 1:
count.infected = val;
break;
case 2:
count.dead = val;
break;
case 3:
count.recovered = val;
break;
}
}
console.log(count !== oldCount);
//push updated count to clients
!count !== oldCount && [
console.error("emmited update"),
emitter.emit("event", {
type: "infected-update",
data: count.infected-count.recovered
})
];
});
};
/*
//debug, delete me maybe
let i = 0;
setInterval(() => {
count.dead = i;
i++;
emitter.emit("event", {
type: "infected-update",
data: count
});
}, 999);
*/
//first init of data
setTimeout(getCount);
//interval to fetch infected-data from host
const intervalMinutes = 30;
setInterval(getCount, 60 * 1000 * intervalMinutes);
// http://expressjs.com/en/starter/static-files.html
app.use(express.static("public"));
// http://expressjs.com/en/starter/basic-routing.html
app.get("/", (req, res) => {
res.sendFile(`${__dirname}/views/index.html`);
});
// listen for requests :)
const listener = app.listen(process.env.PORT, () => {
console.log(`Your app is listening on port ${listener.address().port}`);
});