103 lines
3.6 KiB
JavaScript
Executable File
103 lines
3.6 KiB
JavaScript
Executable File
#!/usr/bin/env node
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'use strict';
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exports = module.exports = {
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start,
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stop
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};
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const debug = require('debug')('syslog:server'),
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fs = require('node:fs'),
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net = require('node:net'),
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path = require('node:path'),
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paths = require('./src/paths.js'),
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util = require('node:util');
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let gServer = null;
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// https://docs.docker.com/engine/logging/drivers/syslog/
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// example: <34>1 2023-09-07T14:33:22Z myhost myapp pid msgid [exampleSDID@32473 iut="3" eventSource="Application"] An example message
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// the structured data can be "-" when missing
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function parseRFC5424Message(rawMessage) {
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const syslogRegex = /^<(?<priority>\d+)>(?<version>\d+) (?<timestamp>\S+) (?<hostname>\S+) (?<appName>\S+) (?<procId>\S+) (?<msgId>\S+) (?:\[(?<structuredData>.*?)\]|-)(?<message>.*)$/s; // /s means .* will match newline . (?: is non-capturing group
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const match = rawMessage.match(syslogRegex);
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if (!match) return null;
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const { priority, version, timestamp, hostname, appName, procId, msgId, structuredData, message } = match.groups;
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return {
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pri: parseInt(priority, 10), // priority
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version: parseInt(version, 10), // version
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timestamp, // timestamp
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hostname, // hostname
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appName, // app name
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procId, // process ID
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msgId, // message ID
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structuredData: structuredData || null, // structured data (if present)
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message // message
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};
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}
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async function start() {
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debug('==========================================');
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debug(' Cloudron Syslog Daemon ');
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debug('==========================================');
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gServer = net.createServer();
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gServer.on('error', function (error) {
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console.error(`server error: ${error}`);
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});
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gServer.on('connection', function (socket) {
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socket.on('data', function (data) {
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const msg = data.toString('utf8').trim(); // strip any trailing empty new lines. it's unclear why we get it in the first place
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for (const line of msg.split('\n')) { // empirically, multiple messages can arrive in a single packet
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const info = parseRFC5424Message(line);
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if (!info) return debug(`Unable to parse: [${msg}]`);
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if (!info.appName) return debug(`Ignore unknown app: [${msg}]`);
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const appLogDir = path.join(paths.LOG_DIR, info.appName);
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try {
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fs.mkdirSync(appLogDir, { recursive: true });
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fs.appendFileSync(`${appLogDir}/app.log`, `${info.timestamp} ${info.message.trim()}\n`);
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} catch (error) {
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debug(error);
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}
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}
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});
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socket.on('error', function (error) {
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debug(`socket error: ${error}`);
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});
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});
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await fs.promises.rm(paths.SYSLOG_SOCKET_FILE, { force: true });
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await util.promisify(gServer.listen.bind(gServer))(paths.SYSLOG_SOCKET_FILE);
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debug(`Listening on ${paths.SYSLOG_SOCKET_FILE}`);
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}
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async function stop() {
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await fs.promises.rm(paths.SYSLOG_SOCKET_FILE, { force: true });
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gServer.unref(); // TODO : cleanup client connections. otherwise server.close() won't return
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gServer = null;
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}
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async function main() {
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await start();
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process.on('SIGTERM', async function () {
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debug('Received SIGTERM. Shutting down.');
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await stop();
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setTimeout(process.exit.bind(process), 1000);
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});
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}
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if (require.main === module) {
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main();
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}
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