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server.js
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server.js
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'use strict';
const fs = require('fs');
const express = require('express');
const spawn = require('child_process').spawn;
const bodyParser = require('body-parser');
const API_KEY_HEADER = 'X-API-KEY';
const PORT = 8080;
const REPORTS_DIR = './home/chrome/reports';
function validURL(url, res) {
if (!url) {
res.status(400).send('Please provide a URL.');
return false;
}
if (!url.startsWith('http')) {
res.status(400).send('URL must start with http.');
return false;
}
return true;
}
function getDefaultArgs(outputPath, format) {
return [
`--output-path=${outputPath}`,
`--output=${format}`,
// Dicey to use port=0 to launch a new instance of Chrome per invocation
// of LH. On Linux, eventually Chrome Launcher begins to fail.
// Root is https://github.com/GoogleChrome/chrome-launcher/issues/6.
// '--port=9222',
'--port=0', // choose random port every time so we launch a new instance of Chrome.
// Note: this is a noop when using Dockerfile.nonheadless b/c Chrome is already launched.
'--chrome-flags="--headless"',
];
}
// Handler for CI.
function runLH(params, req, res, next) {
const url = params.url;
const format = params.output || params.format || 'html';
const log = params.log || req.method === 'GET';
if (!validURL(url, res)) {
return;
}
const fileName = `report.${Date.now()}.${format}`;
const outputPath = `${REPORTS_DIR}/${fileName}`;
const args = getDefaultArgs(outputPath, format);
const child = spawn('lighthouse', [...args, url]);
child.stderr.pipe(process.stderr);
child.stdout.pipe(process.stdout);
if (log) {
res.writeHead(200, {
'Content-Type': 'text/html',
'Cache-Control': 'no-cache',
'Connection': 'keep-alive',
'X-Accel-Buffering': 'no' // Forces Flex App Engine to keep connection open for streaming.
});
res.write(`
<style>
textarea {
font: inherit;
width: 100vw;
height: 100vh;
border: none;
outline: none;
}
</style>
<textarea>
`);
}
child.stderr.on('data', data => {
const str = data.toString();
if (log) {
res.write(str);
}
});
child.on('close', statusCode => {
if (log) {
res.write('</textarea>');
res.write(`<meta http-equiv="refresh" content="0;URL='/${fileName}'">`);
res.end();
} else {
res.sendFile(`/${outputPath}`, {}, err => {
if (err) {
next(err);
}
// delete report
fs.unlink(outputPath, err => {
if (err) {
next(err);
}
});
});
}
});
}
// Serve sent event handler for https://lighthouse-ci.appspot.com/try.
function runLighthouseAsEventStream(req, res, next) {
const url = req.query.url;
const format = req.query.output || req.query.format || 'html';
if (!validURL(url, res)) {
return;
}
// Send headers for event-stream connection.
res.writeHead(200, {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
'Connection': 'keep-alive',
'Access-Control-Allow-Origin': '*',
'X-Accel-Buffering': 'no' // Forces Flex App Engine to keep connection open for SSE.
});
const fileName = `report.${Date.now()}.${format}`;
const outputPath = `./${REPORTS_DIR}/${fileName}`;
const args = getDefaultArgs(outputPath, format);
const child = spawn('lighthouse', [...args, url]);
// console.log('pid', child.pid);
child.stderr.pipe(process.stderr);
child.stdout.pipe(process.stdout);
let log = '';
// child.on('exit', (statusCode, signal) => {
// console.log(statusCode, signal);
// });
child.stderr.on('data', data => {
const str = data.toString();
res.write(`data: ${str}\n\n`);
log += str;
});
child.on('close', statusCode => {
if (log.match(/Error: /gm)) {
res.write(`data: ERROR\n\n`);
} else {
const serverOrigin = `https://${req.hostname}/`;
res.write(`data: done ${serverOrigin + fileName}\n\n`);
}
res.status(410).end();
log = '';
});
}
const app = express();
app.use(bodyParser.json());
app.use(function enableCors(req, res, next) {
res.set('Access-Control-Allow-Origin', '*');
// Record GA hit.
// const visitor = ua(GA_ACCOUNT, {https: true});
// visitor.pageview(req.originalUrl).send();
next();
});
app.use(express.static(REPORTS_DIR));
app.get('/ci', (req, res, next) => {
const apiKey = req.query.key;
// Require API for get requests.
if (!apiKey) {
res.status(403).send('Missing API key. Please include the key parameter');
return;
}
console.log(`${API_KEY_HEADER}: ${apiKey}`);
runLH(req.query, req, res, next);
});
app.post('/ci', (req, res, next) => {
// // Require an API key from users.
// if (!req.get(API_KEY_HEADER)) {
// const msg = `${API_KEY_HEADER} is missing`;
// const err = new Error(msg);
// res.status(403).json(err.message);
// return;
// }
console.log(`${API_KEY_HEADER}: ${req.get(API_KEY_HEADER)}`);
runLH(req.body, req, res, next);
});
app.get('/stream', (req, res, next) => {
runLighthouseAsEventStream(req, res, next);
});
app.listen(PORT);
console.log(`Running on http://localhost:${PORT}`);