232 lines
8.2 KiB
Markdown
232 lines
8.2 KiB
Markdown
# log4js-node
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NOTE: v0.3.8 of log4js is the last that will work with node versions older than 0.4. To use v0.3.9 you will need node 0.4 or later.
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This is a conversion of the [log4js](http://log4js.berlios.de/index.html)
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framework to work with [node](http://nodejs.org). I've mainly stripped out the browser-specific code
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and tidied up some of the javascript. It includes a basic file logger, with log rolling based on file size, and also replaces node's console.log functions.
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NOTE: in v0.2.x require('log4js') returned a function, and you needed to call that function in your code before you could use it. This was to make testing easier. v0.3.x make use of [felixge's sandbox-module](https://github.com/felixge/node-sandboxed-module), so we don't need to return a function.
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## installation
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npm install log4js
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## tests
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Tests now use [vows](http://vowsjs.org), run with `vows test/*.js`.
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## usage
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Minimalist version:
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var log4js = require('log4js');
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var logger = log4js.getLogger();
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logger.debug("Some debug messages");
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By default, log4js outputs to stdout with the coloured layout (thanks to [masylum](http://github.com/masylum)), so for the above you would see:
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[2010-01-17 11:43:37.987] [DEBUG] [default] - Some debug messages
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See example.js:
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var log4js = require('log4js'); //note the need to call the function
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log4js.addAppender(log4js.consoleAppender());
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log4js.addAppender(log4js.fileAppender('logs/cheese.log'), 'cheese');
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var logger = log4js.getLogger('cheese');
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logger.setLevel('ERROR');
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logger.trace('Entering cheese testing');
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logger.debug('Got cheese.');
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logger.info('Cheese is Gouda.');
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logger.warn('Cheese is quite smelly.');
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logger.error('Cheese is too ripe!');
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logger.fatal('Cheese was breeding ground for listeria.');
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Output:
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[2010-01-17 11:43:37.987] [ERROR] cheese - Cheese is too ripe!
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[2010-01-17 11:43:37.990] [FATAL] cheese - Cheese was breeding ground for listeria.
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## configuration
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You can either configure the appenders and log levels manually (as above), or provide a
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configuration file (`log4js.configure('path/to/file.json')`) explicitly, or just let log4js look for a file called `log4js.json` (it looks in the current directory first, then the require paths, and finally looks for the default config included in the same directory as the `log4js.js` file).
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An example file can be found in `test/log4js.json`. An example config file with log rolling is in `test/with-log-rolling.json`.
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By default, the configuration file is checked for changes every 60 seconds, and if changed, reloaded. This allows changes to logging levels
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to occur without restarting the application.
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To turn off configuration file change checking, configure with:
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var log4js = require('log4js');
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log4js.configure(undefined, {}); // load 'log4js.json' from NODE_PATH
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Or:
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log4js.configure('my_log4js_configuration.json', {});
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To specify a different period:
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log4js.configure(undefined, { reloadSecs: 300 }); // load 'log4js.json' from NODE_PATH
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You can also pass an object to the configure function, which has the same properties as the json versions.
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## connect/express logger
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A connect/express logger has been added to log4js, by [danbell](https://github.com/danbell). This allows connect/express servers to log using log4js. See example-connect-logger.js.
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var log4js = require('./lib/log4js');
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log4js.addAppender(log4js.consoleAppender());
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log4js.addAppender(log4js.fileAppender('cheese.log'), 'cheese');
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var logger = log4js.getLogger('cheese');
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logger.setLevel('INFO');
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var app = require('express').createServer();
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app.configure(function() {
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app.use(log4js.connectLogger(logger, { level: log4js.levels.INFO }));
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});
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app.get('/', function(req,res) {
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res.send('hello world');
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});
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app.listen(5000);
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The options object that is passed to log4js.connectLogger supports a format string the same as the connect/express logger. For example:
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app.configure(function() {
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app.use(log4js.connectLogger(logger, { level: log4js.levels.INFO, format: ':method :url' }));
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});
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## hook.io logger
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A [hook.io](https://github.com/hookio) logger has been added to log4js by [dbrain](https://github.com/dbrain). This allows multiple worker processes to log through a single master process, avoiding issues with rolling etc. in a clustered environment.
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This was mainly created for [cluster](https://github.com/LearnBoost/cluster), but you can adapt the example to match your needs, you know, if it fits them.
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<pre>
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#### log4js-master.json ####
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{
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"appenders": [{
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"type": "logLevelFilter",
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"level": "DEBUG",
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"appender": {
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"type": "hookio",
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"name": "hookio-logger",
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"mode": "master",
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"debug": false,
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"appender": {
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"type": "file",
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"filename": "muffin.log",
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"maxLogSize": 104857600,
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"backups": 10,
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"pollInterval": 15
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}
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}
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}]
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}
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#### log4js-worker.json ####
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{
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"appenders": [{
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"type": "logLevelFilter",
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"level": "DEBUG",
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"appender": {
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"type": "hookio",
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"name": "hookio-logger",
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"mode": "worker",
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"debug": false
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}
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}]
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}
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#### ilikebeans.js ####
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var cluster = require('cluster');
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var hookCluster = cluster('./doyoulikebeans');
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// Perform the once off configuration depending on type of cluster
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if (hookCluster.isMaster) {
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require('log4js').configure('log4js-master.json');
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} else {
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require('log4js').configure('log4js-worker.json');
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}
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// Standard cluster startup
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hookCluster
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.use(cluster.logger('run/logs'))
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.use(cluster.pidfiles('run/pids'))
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.listen(3000);
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</pre>
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log4js-master/worker.json hookio appender parameters will be passed into the Hook constructor directly, so you can specify hook-port, hook-host etc.
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*NOTE* hook.io appender will currently (and probably indefinitely) explode if you enable hook.io debug because of the way log4js overrides console.log
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## multiprocess (tcp socket) logger
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A multiprocess logger has been added to log4js by [dbrain](https://github.com/dbrain). This allows multiple worker processes to log through a single master process, avoiding issues with rolling etc. in a clustered environment.
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This was mainly created for [cluster](https://github.com/LearnBoost/cluster), but you can adapt the example to match your needs, you know, if it fits them.
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<pre>
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#### log4js-master.json ####
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# Will listen for connections on port and host
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{
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"appenders": [{
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"type": "logLevelFilter",
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"level": "DEBUG",
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"appender": {
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"type": "multiprocess",
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"mode": "master",
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"loggerPort": 5001,
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"loggerHost": "simonsaysdie",
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"appender": {
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"type": "file",
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"filename": "muffin.log",
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"maxLogSize": 104857600,
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"backups": 10,
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"pollInterval": 15
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}
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}
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}]
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}
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#### log4js-worker.json ####
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# Will connect to master (tcp server) and send stringified log events
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{
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"appenders": [{
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"type": "logLevelFilter",
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"level": "DEBUG",
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"appender": {
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"type": "multiprocess",
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"mode": "worker",
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"loggerPort": 5001,
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"loggerHost": "simonsaysdie"
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}
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}]
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}
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#### ilikebeans.js ####
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var cluster = require('cluster');
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var immaCluster = cluster('./doyoulikebeans');
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// Perform the once off configuration depending on type of cluster
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if (immaCluster.isMaster) {
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require('log4js').configure('log4js-master.json');
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} else {
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require('log4js').configure('log4js-worker.json');
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}
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// Standard cluster startup
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immaCluster
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.use(cluster.logger('run/logs'))
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.use(cluster.pidfiles('run/pids'))
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.listen(3000);
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</pre>
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## author (of this node version)
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Gareth Jones (csausdev - gareth.jones@sensis.com.au)
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## License
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The original log4js was distributed under the Apache 2.0 License, and so is this. I've tried to
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keep the original copyright and author credits in place, except in sections that I have rewritten
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extensively.
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