wikijs-fork/agent.js

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// ===========================================
// REQUARKS WIKI - Background Agent
// 1.0.0
// Licensed under AGPLv3
// ===========================================
global.ROOTPATH = __dirname;
// ----------------------------------------
// Load Winston
// ----------------------------------------
var _isDebug = process.env.NODE_ENV === 'development';
global.winston = require('winston');
winston.remove(winston.transports.Console)
winston.add(winston.transports.Console, {
level: (_isDebug) ? 'info' : 'warn',
prettyPrint: true,
colorize: true,
silent: false,
timestamp: true
});
// ----------------------------------------
// Fetch internal handshake key
// ----------------------------------------
if(!process.argv[2] || process.argv[2].length !== 40) {
winston.error('[WS] Illegal process start. Missing handshake key.');
process.exit(1);
}
global.WSInternalKey = process.argv[2];
// ----------------------------------------
// Load modules
// ----------------------------------------
winston.info('[AGENT] Background Agent is initializing...');
var appconfig = require('./models/config')('./config.yml');
global.git = require('./models/git').init(appconfig);
global.entries = require('./models/entries').init(appconfig);
global.mark = require('./models/markdown');
var _ = require('lodash');
var moment = require('moment');
var Promise = require('bluebird');
var fs = Promise.promisifyAll(require("fs-extra"));
var path = require('path');
var cron = require('cron').CronJob;
var wsClient = require('socket.io-client');
global.ws = wsClient('http://localhost:' + appconfig.wsPort, { reconnectionAttempts: 10 });
// ----------------------------------------
// Start Cron
// ----------------------------------------
var jobIsBusy = false;
var job = new cron({
cronTime: '0 */5 * * * *',
onTick: () => {
// Make sure we don't start two concurrent jobs
if(jobIsBusy) {
winston.warn('[AGENT] Previous job has not completed gracefully or is still running! Skipping for now. (This is not normal, you should investigate)');
return;
}
jobIsBusy = true;
// Prepare async job collector
let jobs = [];
let repoPath = path.resolve(ROOTPATH, appconfig.datadir.repo);
// ----------------------------------------
// Compile Jobs
// ----------------------------------------
//-> Resync with Git remote
jobs.push(git.onReady.then(() => {
return git.resync().then(() => {
//-> Stream all documents
let cacheJobs = [];
fs.walk(repoPath).on('data', function (item) {
if(path.extname(item.path) === '.md') {
let entryPath = entries.parsePath(entries.getEntryPathFromFullPath(item.path));
let cachePath = entries.getCachePath(entryPath);
//-> Purge outdated cache
cacheJobs.push(
fs.statAsync(cachePath).then((st) => {
return moment(st.mtime).isBefore(item.stats.mtime) ? 'expired' : 'active';
}).catch((err) => {
return (err.code !== 'EEXIST') ? err : 'new';
}).then((fileStatus) => {
//-> Delete expired cache file
if(fileStatus === 'expired') {
return fs.unlinkAsync(cachePath).return(fileStatus);
}
return fileStatus;
}).then((fileStatus) => {
//-> Update search index
if(fileStatus !== 'active') {
return entries.fetchIndexableVersion(entryPath).then((content) => {
ws.emit('searchAdd', {
auth: WSInternalKey,
content
});
});
}
return true;
})
);
}
});
return Promise.all(cacheJobs);
});
}));
// ----------------------------------------
// Run
// ----------------------------------------
Promise.all(jobs).then(() => {
winston.info('[AGENT] All jobs completed successfully! Going to sleep for now...');
}).catch((err) => {
winston.error('[AGENT] One or more jobs have failed: ', err);
}).finally(() => {
jobIsBusy = false;
});
},
start: false,
timeZone: 'UTC',
runOnInit: true
});
// ----------------------------------------
// Connect to local WebSocket server
// ----------------------------------------
ws.on('connect', function () {
job.start();
winston.info('[AGENT] Background Agent started successfully! [RUNNING]');
});
ws.on('connect_error', function () {
winston.warn('[AGENT] Unable to connect to WebSocket server! Retrying...');
});
ws.on('reconnect_failed', function () {
winston.error('[AGENT] Failed to reconnect to WebSocket server too many times! Stopping agent...');
process.exit(1);
});
// ----------------------------------------
// Shutdown gracefully
// ----------------------------------------
process.on('disconnect', () => {
winston.warn('[AGENT] Lost connection to main server. Exiting...');
job.stop();
process.exit();
});
process.on('exit', () => {
job.stop();
});