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const path = require('path');
const fs = require('fs');
const http = require('http');
const WebSocket = require('ws');
const _ = require('lodash');
const express = require('express');
const ejs = require('ejs');
const opener = require('opener');
const mkdir = require('mkdirp');
const {bold} = require('chalk');
const Logger = require('./Logger');
const analyzer = require('./analyzer');
const projectRoot = path.resolve(__dirname, '..');
const assetsRoot = path.join(projectRoot, 'public');
function resolveTitle(reportTitle) {
if (typeof reportTitle === 'function') {
return reportTitle();
} else {
return reportTitle;
}
}
module.exports = {
startServer,
generateReport,
generateJSONReport,
// deprecated
start: startServer
};
async function startServer(bundleStats, opts) {
const {
port = 8888,
host = '127.0.0.1',
openBrowser = true,
bundleDir = null,
logger = new Logger(),
defaultSizes = 'parsed',
excludeAssets = null,
reportTitle
} = opts || {};
const analyzerOpts = {logger, excludeAssets};
let chartData = getChartData(analyzerOpts, bundleStats, bundleDir);
if (!chartData) return;
const app = express();
// Explicitly using our `ejs` dependency to render templates
// Fixes #17
app.engine('ejs', require('ejs').renderFile);
app.set('view engine', 'ejs');
app.set('views', `${projectRoot}/views`);
app.use(express.static(`${projectRoot}/public`));
app.use('/', (req, res) => {
res.render('viewer', {
mode: 'server',
title: resolveTitle(reportTitle),
get chartData() { return chartData },
defaultSizes,
enableWebSocket: true,
// Helpers
escapeJson
});
});
const server = http.createServer(app);
await new Promise(resolve => {
server.listen(port, host, () => {
resolve();
const url = `http://${host}:${server.address().port}`;
logger.info(
`${bold('Webpack Bundle Analyzer')} is started at ${bold(url)}\n` +
`Use ${bold('Ctrl+C')} to close it`
);
if (openBrowser) {
opener(url);
}
});
});
const wss = new WebSocket.Server({server});
wss.on('connection', ws => {
ws.on('error', err => {
// Ignore network errors like `ECONNRESET`, `EPIPE`, etc.
if (err.errno) return;
logger.info(err.message);
});
});
return {
ws: wss,
http: server,
updateChartData
};
function updateChartData(bundleStats) {
const newChartData = getChartData(analyzerOpts, bundleStats, bundleDir);
if (!newChartData) return;
chartData = newChartData;
wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
client.send(JSON.stringify({
event: 'chartDataUpdated',
data: newChartData
}));
}
});
}
}
async function generateReport(bundleStats, opts) {
const {
openBrowser = true,
reportFilename,
reportTitle,
bundleDir = null,
logger = new Logger(),
defaultSizes = 'parsed',
excludeAssets = null
} = opts || {};
const chartData = getChartData({logger, excludeAssets}, bundleStats, bundleDir);
if (!chartData) return;
await new Promise((resolve, reject) => {
ejs.renderFile(
`${projectRoot}/views/viewer.ejs`,
{
mode: 'static',
title: resolveTitle(reportTitle),
chartData,
defaultSizes,
enableWebSocket: false,
// Helpers
assetContent: getAssetContent,
escapeJson
},
(err, reportHtml) => {
try {
if (err) {
logger.error(err);
reject(err);
return;
}
const reportFilepath = path.resolve(bundleDir || process.cwd(), reportFilename);
mkdir.sync(path.dirname(reportFilepath));
fs.writeFileSync(reportFilepath, reportHtml);
logger.info(`${bold('Webpack Bundle Analyzer')} saved report to ${bold(reportFilepath)}`);
if (openBrowser) {
opener(`file://${reportFilepath}`);
}
resolve();
} catch (e) {
reject(e);
}
}
);
});
}
async function generateJSONReport(bundleStats, opts) {
const {reportFilename, bundleDir = null, logger = new Logger(), excludeAssets = null} = opts || {};
const chartData = getChartData({logger, excludeAssets}, bundleStats, bundleDir);
if (!chartData) return;
mkdir.sync(path.dirname(reportFilename));
fs.writeFileSync(reportFilename, JSON.stringify(chartData));
logger.info(`${bold('Webpack Bundle Analyzer')} saved JSON report to ${bold(reportFilename)}`);
}
function getAssetContent(filename) {
const assetPath = path.join(assetsRoot, filename);
if (!assetPath.startsWith(assetsRoot)) {
throw new Error(`"${filename}" is outside of the assets root`);
}
return fs.readFileSync(assetPath, 'utf8');
}
/**
* Escapes `<` characters in JSON to safely use it in `<script>` tag.
*/
function escapeJson(json) {
return JSON.stringify(json).replace(/</gu, '\\u003c');
}
function getChartData(analyzerOpts, ...args) {
let chartData;
const {logger} = analyzerOpts;
try {
chartData = analyzer.getViewerData(...args, analyzerOpts);
} catch (err) {
logger.error(`Could't analyze webpack bundle:\n${err}`);
logger.debug(err.stack);
chartData = null;
}
if (_.isPlainObject(chartData) && _.isEmpty(chartData)) {
logger.error("Could't find any javascript bundles in provided stats file");
chartData = null;
}
return chartData;
}