68 lines
2.8 KiB
Markdown
68 lines
2.8 KiB
Markdown
# log4js-node
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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.
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NOTE: since v0.2.0 require('log4js') returns a function, so you need to call that function in your code before you can use it. I've done this to make testing easier (allows dependency injection).
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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/logging.js`. I am slowly porting the previous tests from jspec (run those with `node tests.js`), since jspec is no longer maintained.
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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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## todo
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patternLayout has no tests. This is mainly because I haven't found a use for it yet,
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and am not entirely sure what it was supposed to do. It is more-or-less intact from
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the original log4js.
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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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