nb-log
- 选择winston做封装
- 传送门 https://github.com/winstonjs/winston/
- 使用上希望不考虑配置,比如直接const logger = require('nb-log')
- 或者import logger from 'nb-log'
- 再或者const logger = require('nb-log').createLogger()也可以接受
- 总之,不要在逻辑代码使用logger的时候,还去考虑logger的配置问题
- 那么问题是,配置该在哪里做
- 最好是cwd下有一个json配置文件nb-log.json
- 考虑到js配置文件也很方便,并且更强大,可以接受nb-log-conf.js
- 所以require('nb-log')执行的时候,就会去cwd找配置文件
- 为什么是cwd,主要是希望node-modules里的模块不要有独立的logger配置
- 1、所有逻辑代码使用的logger都统一用一个默认配置
- 2、有及其特殊的情况时,可以考虑createLogger('mySpecialCategories')来获取特殊的logger
- 3、如果categories不存在则使用默认配置
- 第一版的目标:
- createLogger()的方式创建logger
- nb-log能读取cwd的配置
- log的format简单点也行
- log的文件名必须区分出哪个项目,哪个进程id
- error级别的log单独出一个文件
安装
# npm install nb-log
使用
const logger = require('nb-log').createLogger()
const levels = {
error: 0,
warn: 1,
info: 2,
verbose: 3,
debug: 4,
silly: 5
}
for (let level in levels) {
logger[level](`this is level ${level} - ${levels[level]}`)
}
logger.error(new Error('heap out'))
默认配置
{
level: 'info',
format: format.combine(errorFormat(), format.timestamp(), format.printf((info) => {
return `[${info.timestamp}] [${info.level}] - ${info.message}`
})),
transports: [
new transports.Console(),
new DailyRotateFile({
level: 'error',
filename: `./logs/${pname}-${pid}-error-%DATE%.log`,
datePattern: 'YYYY-MM-DD',
zippedArchive: true,
maxSize: '100m',
maxFiles: '14d'
}),
new DailyRotateFile({filename: `./logs/${pname}-${pid}-out-%DATE%.log`, datePattern: 'YYYY-MM-DD', zippedArchive: true, maxSize: '100m', maxFiles: '14d'})
]
}
pname : 项目名称
pid : 进程id
log输出如下
[2018-05-08T09:28:19.282Z] [error] - this is level error - 0
[2018-05-08T09:28:19.286Z] [warn] - this is level warn - 1
[2018-05-08T09:28:19.286Z] [info] - this is level info - 2
[2018-05-08T09:28:19.287Z] [error] - Error: heap out
at Object.<anonymous> (/project/nb-log/test.js:16:14)
at Module._compile (module.js:635:30)
at Object.Module._extensions..js (module.js:646:10)
at Module.load (module.js:554:32)
at tryModuleLoad (module.js:497:12)
at Function.Module._load (module.js:489:3)
at Function.Module.runMain (module.js:676:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
自定义输出
在项目的当前工作目录(process.cwd)新建nb-log-conf.js文件并配置自定义createLogger
const {createLogger, format, transports} = require('winston')
const {timestamp, label, printf} = format
const DailyRotateFile = require('winston-daily-rotate-file')
const fs = require('fs')
const path = require('path')
const pid = process.pid
const pname = path.basename(process.cwd())
const errorFormat = format((info, opts) => {
if (info instanceof Error) {
info.message = info.stack
}
return info
})
module.exports = {
createLogger: () => {
return createLogger({
level: 'info',
format: format.combine(errorFormat(), format.timestamp(), format.printf((info) => {
return `[${info.timestamp}] [${info.level}] - ${info.message}`
})),
transports: [
new transports.Console(),
new DailyRotateFile({
level: 'error',
filename: `./logs/${pname}-${pid}-error-%DATE%.log`,
datePattern: 'YYYY-MM-DD',
zippedArchive: true,
maxSize: '100m',
maxFiles: '14d'
}),
new DailyRotateFile({filename: `./logs/${pname}-${pid}-out-%DATE%.log`, datePattern: 'YYYY-MM-DD', zippedArchive: true, maxSize: '100m', maxFiles: '14d'})
]
})
}
}
测试当前项目
# node test.js