pince

A logger for node inspired by log4j and commons-logging.

npm install pince
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Pince

Pince is a lightweight logger that combines some of the best properties of log4j and node. It's equally usable in Node, (most) browsers, and Meteor (client and server).

It was developed for MadEye.

Features:

  • Log levels: error, warn, info, debug, trace
  • Dynamically change the log level on the client.
  • Change the log level with no code changes on the server.
  • Logging is very lightweight when there's nothing listening to it.
  • Each logger has a name -- you can set levels individually by name!
  • Names can be heirarchally namespaced by separating them with ':'s, like myLibrary:aModule:thisObject.
  • Set log levels by any level of the namespace hierarcy!

Installation (Node.js)

To install, npm install pince.

In any file you wish to make a logger, require it via Logger = require('pince');

Installation (Meteor)

To install, just mrt add pince. The global Logger symbol will be there waiting for you.

Usage

Set the log level:

//Default is info
Logger.setLevel('trace');

Make a new logger:

log = new Logger('router');
log.info("Routing.");
//2013-10-31 11:29:36.097 info:  [router]  Routing.
log.trace("Setting up routes...");
//2013-10-31 11:29:36.101 trace:  [router]  Setting up routes...

Set individual levels:

Logger.setLevel('info');
Logger.setLevel('controller', 'trace');
routerLog = new Logger('router');
controllerLog = new Logger('controller');

routerLog.trace("Can't hear me!");
//Nothing
controllerLog.trace("Can hear me."):
//2013-10-31 11:31:21.906 trace:  [controller]  Can hear me.

Logger.setLevels({router:'debug', controller:'warn'});
routerLog.info("Finally! Someone is listening to me.");
//2013-10-31 11:32:48.374 info:  [router]  Finally! Someone is listening to me.
controllerLog.info("Hello? Hello??");
//Nothing

Hierarchically name and set levels:

routerLog = new Logger('myPackage:router');
controllerLog = new Logger('myPackage:controller');
Logger.setLevel('myPackage', 'info');
Logger.setLevel('myPackage:controller', 'debug');

routerLog.info('You can see this.');
routerLog.debug('You cannot see this; myPackage level is set to info.');
controllerLog.debug('You can see this, myPackage:controller level is set to debug.');
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