oniyi-logger

A simple loglevel and label wrapper around process.stdout

Install

$ npm install --save oniyi-logger

Usage

all log functions work similar to console.log() and can take multiple arguments in a printf()-like way.
Note that the debug method is a noop per default. To enable debug logging, you must use a labled logger,
and list the label in the NODE_DEBUG environment variable.
NODE_DEBUG must be a comma, or space separated list

var fs = require('fs');

// standard use-case, will log to process.stdout
var logger = require('oniyi-logger')();

logger.info('my %s message', 'info');
// INFO my info message
logger.debug('my debug message');
// Does not log anything
logger.warn('my warn message');
// WARN my warn message
logger.error('my error message');
// ERROR my error message


// log with labels
process.env.NODE_DEBUG = 'my-label';
var labeledLogger = require('oniyi-logger')('my-label');

labeledLogger.info('my info message');
// INFO [my-label] my info message
labeledLogger.debug('my debug message');
// DEBUG [my-label] my debug message
labeledLogger.warn('my warn message');
// WARN [my-label] my warn message
labeledLogger.error('my error message');
// ERROR [my-label] my error message


// log to a file
var labeledFileLog = require('oniyi-logger')('file', {sink: fs.createWriteStream('file.log, {flags: 'a'}')});

labeledFileLog.info('my info message');
// writes "INFO [file] my info message" to file.log
labeledFileLog.debug('my debug message');
// writes does not write anything to file.log
labeledFileLog.warn('my warn message');
// writes "WARN [file] my warn message" to file.log
labeledFileLog.error('my error message');
// writes "ERROR [file] my wrror message" to file.log

Use a logger's instance methods enableDebug() and disableDebug to enable or disable debugging on that particular instance.

License

Apache 2.0 © Benjamin Kroeger