Yeah, but don't log to disk if you care about performance, which I'm guessing you do since you're using cluster :)
Here's why -- https://medium.com/node-js-javascript/37a93d4e0013. You may also want to look at this -- https://github.com/hij1nx/net-log -- https://twitter.com/hij1nx https://github.com/hij1nx On Tuesday, April 29, 2014 7:31:38 AM UTC-4, Alexey Petrushin wrote: > > Adam Wiggins, one of creator of Heroky wrote interested post about > logging, you may find it interesting > http://adam.heroku.com/past/2011/4/1/logs_are_streams_not_files/ > > On Monday, 28 April 2014 14:48:46 UTC+4, Jose Luis Rivas wrote: >> >> I would suggest you to not write directly but redirect output to a file. >> >> node app.js > file.log >> >> keep it simple. >> >> On 4/28/14, 5:45 AM, gen chen wrote: >> > I am now working on a node.js project based on cluster. I got stuck on >> > the logging. After doing some research, I worked out a solution. here >> > is it. i don't know if it is a good idea. The idea is like this. only >> > master process can wirte to the log file, if the current process is a >> > worker, then it send a log message to the master and then write to the >> > log file while the master can directly write to the log file. this can >> > avoid multiple process open and write to a same file. >> > >> > var util = require('util'); >> > var fs = require('fs'); >> > var cluster = require('cluster'); >> > >> > var logger = module.exports; >> > >> > var levels = ['debug', 'info', 'warn', 'error', 'fatal']; >> > var logLevel = 'debug'; >> > >> > var logfile = null; >> > var errorLogfile = null; >> > >> > >> > if(cluster.isMaster){ >> > >> > logfile = fs.createWriteStream('debug.log', {flags:'a'}); >> > errorLogfile = fs.createWriteStream('error.log', {flags:'a'}); >> > >> > cluster.on('online', function(worker){ >> > //collect log message from child and write to logfile. >> > worker.on('message', function(msg){ >> > if(msg.type == 'logging') { >> > var level = msg.data.level; >> > var logStr = msg.data.msg; >> > if(levels.indexOf(level) >= levels.indexOf('error')){ >> > errorLogfile.write(logStr + '\n'); >> > }else{ >> > logfile.write(logStr + '\n'); >> > } >> > } >> > }); >> > }); >> > } >> > >> > >> > function log(level, args){ >> > >> > if(levels.indexOf(level) < levels.indexOf(logLevel)) return; >> > >> > var args = Array.prototype.slice.call(args); >> > >> > args = args.map(function(a){ >> > if(typeof a !== 'string') >> > return JSON.stringify(a); >> > else return a; >> > }); >> > var msg = util.format.apply(null, args); >> > >> > var out = []; >> > out.push(new Date()); >> > out.push('[' + level.toUpperCase() + ']'); >> > out.push(msg); >> > >> > >> > if(cluster.isMaster){ >> > >> > //write directly to the log file >> > if(levels.indexOf(level) >= levels.indexOf('error')){ >> > errorLogfile.write(out.join(' ') + '\n'); >> > }else{ >> > logfile.write(out.join(' ') + '\n'); >> > } >> > >> > }else{ >> > >> > //send to master >> > cluster.worker.process.send({ >> > type : 'logging', >> > data : { >> > level : level, >> > msg : out.join(' ') >> > } >> > }); >> > } >> > >> > } >> > >> > >> > logger.debug = function(){log('debug', arguments);} >> > logger.info = function(){log('info', arguments);} >> > logger.warn = function(){log('warn', arguments);} >> > logger.error = function(){log('error', arguments);} >> > logger.fatal = function(){log('fatal', arguments);} >> > >> > >> > >> > -- >> > -- >> > Job Board: http://jobs.nodejs.org/ >> > Posting guidelines: >> > https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines >> > You received this message because you are subscribed to the Google >> > Groups "nodejs" group. >> > To post to this group, send email to nod...@googlegroups.com >> > To unsubscribe from this group, send email to >> > nodejs+un...@googlegroups.com >> > For more options, visit this group at >> > http://groups.google.com/group/nodejs?hl=en?hl=en >> > >> > --- >> > You received this message because you are subscribed to the Google >> > Groups "nodejs" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> > an email to nodejs+un...@googlegroups.com >> > <mailto:nodejs+un...@googlegroups.com>. >> > For more options, visit https://groups.google.com/d/optout. >> >> -- >> Jose Luis Rivas - http://joseluisrivas.net >> Venezuela - GPG: 0xB9AC8C43 >> > -- Job board: http://jobs.nodejs.org/ New group rules: https://gist.github.com/othiym23/9886289#file-moderation-policy-md Old group rules: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. To post to this group, send email to nodejs@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/nodejs/01359a4a-ef2d-46b4-ae0d-f3505ac32f98%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
