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@kcuf/sls-logger-base

v0.0.4

Published

Aliyun SLS logger without transport implementation.

Downloads

364

Readme

@kcuf/sls-logger-base

阿里云 SLS WebTracking 基础实现,将最终发送消息的方法抽象出去,使其能够很方便地应用于 Web、小程序、Node 等具体环境。

Features

  • ⏱️ 默认 5s 的静默时间,让行应用初始化期间的业务请求,提升业务性能
  • 🗳️ 利用 POST 批量提交日志,避免同一时间内大量的网络请求
  • 📌 支持设定 TOPIC 前缀
  • 🧽 支持采样率
  • 🎈 支持自定义忽略策略(可用于避免不合法的日志上报等)

APIs

  • createLogger(sender: LogSender, options: CreateLoggerOptions): SlsLogger 生成 sls 方法的工厂方法,该方法挂载 6 个快速方法
  • generateCreateLogger(sender: LogSender, options: GenerateCreateLoggerOptions): CreateLogger 生成上边的方法的工厂方法

如何使用

业务代码不会直接用到这个包,因为它不会真正发送日志,只有设定 sender(topic, body, headers) 才行,可以用以下封入 sender 的包:

  • Web 端:@kcuf/sls-logger-web
  • Node 端:@kcuf/sls-logger-node TODO
  • 小程序 端:@kcuf/sls-logger-mp TODO

业务代码最终使用的是 createLogger 的产物,即 sls 方法,你可以这样调用:

sls(topic);
sls(topic, payload);
sls(options, topic);
sls(options, topic, payload);

以上,options 可用于覆盖创建 sls 的时候的 prefixsampling 等工厂默认的参数,也可以立即发送日志,默认所有的日志会在一定的时间内积压,以避免和业务逻辑竞争。

记录的数据

这是一个基础的库,不具有平台性或业务性,因此除了最基础的日志信息之外,不记录任何数据,以下是日志中的默认数据:

  • _TOPIC:虽然有 __topic__,但这个值可能被系统篡改,因此会冗余一个 _TOPIC
  • _GROUP:可用于对日志进行分类,取值 DEBUG LOG INFO WARN ERROR FATAL,默认 LOG(有需要可以自定义)

FAQ

为什么调用 sls(..) 后要等一段时间才见发送日志?

  1. 为了让行业务请求,加载完成后会有默认 5s 的静默时间,这段时间内,不会发送请求
  2. 每条日志都不会立即发送,而是进入一个队列,并刷新等待时间(默认 200ms),等到空闲的时候才进行批量发送

有的日志很重要,不想因为静默时间或等待时间漏掉,需要立即上报,怎么办?

利用 instant 参数:

sls({
  instant: true
}, topic, payload);

不想全量,如何进行采样上报?

两个方式:

  1. createLogger 的时候设置采样率,这样它生的 sls 将全部采样
  2. 调用 sls 的时候传入采样率,这样只会针对这一次调用进行采样

参考