序
本文主要从log4j2的角度对zap做一下小结
log4j2
配置
从配置文件上看,分为如下几个部分:
- properties
- appenders filter pattern layout mdc policies SizeBasedTriggeringPolicy TimeBasedTriggeringPolicy rollover strategy
- loggers root logger async logger async root
使用
在使用上主要是考虑几点:
- log的输入 mdc的输入 kv结构的输入 tracing注入
- log的输出 输出格式 json格式 指定pattern layout 输出方式 同步 异步 输出地方 console file kafka/logstash等
- log文件 如何rolling 如何压缩 如何按level分文件输出
zap
- zap貌似没有文件配置,都是通过api进行配置
- zap要自定义layout的话,需要自己定制encoder,zap默认支持json格式 zap可以使用logger的With方法添加全局的field;也可以使用Info之类方法提供的Field参数动态添加field;后者可以结合golang的context衍生出类似log4j2的mdc的效果
- zap的输出使用的是Sink/WriteSyncer,比如要输出到elasticsearch或者mq之类,可以自定义一个sink;zap默认支持console、file输出 对于log文件的压缩以及rolling之类,zap可以借助lumberjack作为WriteSyncer来实现 对于日志级别的过滤,可以借助levelFilterCore;如果要按level分文件,可以结合levelFilterCore创建不同level的core,然后通过zapcore.NewTee来衔接 如果想要同时输出到多种不同的地方,可以使用zapcore.NewMultiWriteSyncer来包装成一个新的core
小结
zap目前貌似没有类似log4j2的async的log,针对layout需要自己定制encoder,针对输出需要自己定制Sink/WriteSyncer,要同时输出到多种不同的地方,可以使用zapcore.NewMultiWriteSyncer来包装成一个新的core。
doc
- zap
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