go-kit 入门(三)日志和仪表化




任何需要日志记录的组件都需要将 logger 作为依赖,就像数据库连接一样。因此,我们在 main 函数中构造 logger 对象,然后将其传入需要使用它的组件中。我们始终不去使用一个全局的 logger 对象。

我们可以直接将 logger 传入到 stringService 的实现代码中,但是,还有一个更好的方式。我们可以使用 中间件 (middleware) ,也常常被称为 装饰者。

middleware 是一个函数,它接收一个 endpoint 作为参数,并且返回一个 endpoint。



事实证明,这项技术是非常有价值的,远远不止于记录日志,Go kit 的很多模块都被实现为端点中间件。


那么,在我们的应用中,应该如何记录日志呢?比如那些需要被传入的参数等。事实上,我们能够为我们的服务定义一个中间件,从而获得同样好的组合效果。由于我们的 StringService被定义为一个接口,我们只需要作出一个新的类型,来包装先有的 StringService,让它来执行扩充的记录日志的任务。




在 Go kit 中,仪表化意味着使用 包指标 来记录关于服务运行行为的状态。统计执行的任务的数量,在请求完成后记录消耗的时间,以及跟踪所有正在执行的操作的数量,都被认为是 仪表化。




目前位置,完整的服务是 stringsvc2.


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