log-tracer

lightweight logger for node.js heavily inspired by log and rotating-file-stream

Features

• default file output
• optional console output
• file rotation support
• log reader support
• cluster mode support

Usage

install

npm i log-tracer --save

import

//default options, 'debug' level
var log = require('log-tracer')()

//levelStr option. 
var log = require('log-tracer')('info') //statement level under 'info' will be ignored.
log.info('info message')   //record normally
log.debug('debug message') //would not be recorded

//details with an object options
var log = require('log-tracer')({
    levelStr: 'error',
    enableConsole: true
})

arguments

• levelStr {String} debug default

Details with an object which have following attributes:

• logName {String} default trace.log
• path {String} parent dir of the logfiles, recommend an absolue path. default ./trace
• size {String} rotation size for the file. default 20M
• maxFiles {Number} max number of files to be stored. default 10
• history {String} history file name for rotation. default ${logName}.txt
• enableConsole {Boolean} enable console output. default false
• reader {Boolean} read log from file. default false

Exapmle

//logger
var log = require('log-tracer')();
log.debug('debug message');
log.info('info message');
log.error('error message');

//reader
var log = require('log-tracer')({reader: true});
log.on('line', (data)=>{
    console.log(data)
})

log levels

• 0 EMERGENCY system is unusable
• 1 ALERT action must be taken immediately
• 2 CRITICAL the system is in critical condition
• 3 ERROR error condition
• 4 WARNING warning condition
• 5 NOTICE a normal but significant condition
• 6 INFO a purely informational message
• 7 DEBUG messages to debug an application

License

MIT