61 lines
1.6 KiB
JavaScript
61 lines
1.6 KiB
JavaScript
'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 LOG_FILENAME = 'app.log';
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const assert = require('assert'),
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dgram = require('dgram'),
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fs = require('fs'),
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path = require('path'),
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parser = require('nsyslog-parser');
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let server = null;
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function start(options, callback) {
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assert.strictEqual(typeof options, 'object');
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assert.strictEqual(typeof options.port, 'number');
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assert.strictEqual(typeof options.logFolder, 'string');
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assert.strictEqual(typeof callback, 'function');
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server = dgram.createSocket('udp4');
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server.on('error', function (error) {
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callback(error);
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}).on('listening', function () {
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callback();
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}).on('message', function (msg /*, rinfo */) {
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const info = parser(msg.toString());
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if (!info || !info.appName) return console.log('Ignore unknown app log:', msg.toString());
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// remove line breaks to avoid holes in the log file
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// we do not ignore empty log lines, to allow gaps for potential ease of readability
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const message = info.message.replace(/\n/g, '');
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const filePath = path.join(options.logFolder, info.appName);
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const fileName = path.join(filePath, LOG_FILENAME);
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try {
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fs.mkdirSync(filePath, { recursive: true });
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fs.appendFileSync(fileName, info.ts.toISOString() + ' ' + message + '\n');
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} catch (error) {
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console.error(error);
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}
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}).bind(options.port);
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}
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function stop(callback) {
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assert.strictEqual(typeof callback, 'function');
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if (!server) return callback();
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server.close();
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server = null;
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callback();
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} |