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index.js
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index.js
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const http = require('http');
const { createReadStream } = require('fs');
const { promisify } = require('util');
const stream = require('stream');
const socketIO = require('socket.io');
const bitgener = require('bitgener');
const pipeline = promisify(stream.pipeline);
const port = process.env.PORT || 3000;
/* eslint no-console: "off" */
// to get a readable stream from a file
const getFileStream = function getFileStream(path, options) {
const rstream = createReadStream(path, options);
rstream.on('error', (err) => {
throw err;
});
if (rstream.readable) {
return rstream;
}
throw new Error('stream not safely readable');
};
// server
const httpServer = http.createServer(async (request, response) => {
request.on('error', (err) => {
console.error(err);
response.statusCode = 400;
response.end(`bad request: ${err.message}`);
});
response.on('error', console.error);
if (request.method === 'GET' && request.url === '/') {
try {
const index = getFileStream('index.html', 'utf-8');
response.statusCode = 200;
await pipeline(index, response);
} catch (err) {
console.error(err);
response.statusCode = 500;
response.end(`unable to load index page: ${err.message}`);
}
} else if (request.method === 'GET' && request.url === '/favicon.png') {
try {
const favicon = getFileStream('favicon.png', 'binary');
response.setHeader('Content-Type', 'image/png');
response.statusCode = 200;
await pipeline(favicon, response);
} catch (err) {
console.error(err);
response.statusCode = 500;
response.end(`unable to load favicon: ${err.message}`);
}
} else if (request.method === 'GET' && request.url === '/favicon.ico') {
try {
const favicon = getFileStream('favicon.ico', 'binary');
response.setHeader('Content-Type', 'image/x-icon');
response.statusCode = 200;
await pipeline(favicon, response);
} catch (err) {
console.error(err);
response.statusCode = 500;
response.end(`unable to load favicon: ${err.message}`);
}
} else {
response.statusCode = 404;
response.end('not found');
}
});
// listening to http port
httpServer.listen(port, () => {
console.log(`http server listening on port ${port}`);
});
// socket connection
const io = socketIO(httpServer);
let visitors = 0;
io.on('connection', async (socket) => {
visitors += 1;
console.log('visitor connected');
console.log(`${visitors} visitor(s) connected`);
// generate a barcode
socket.on('generate', async (params) => {
const ret = {
error: undefined,
svg: undefined,
};
const bitcodeParams = { ...params };
bitcodeParams.output = 'string';
try {
const result = await bitgener(bitcodeParams);
ret.svg = result.svg;
} catch (error) {
ret.error = error;
}
socket.emit('bitcode', ret);
});
// disconnect
socket.on('disconnect', () => {
visitors -= 1;
socket.broadcast.emit('visitors', visitors);
console.log('visitor disconnected');
console.log(`${visitors} visitor(s) connected`);
});
socket.emit('visitors', visitors);
socket.broadcast.emit('visitors', visitors);
});