[GitHub] [pulsar-client-go] merlimat commented on issue #12: package logrus for project

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merlimat commented on issue #12: package logrus for project
URL: https://github.com/apache/pulsar-client-go/pull/12#issuecomment-493313080
 
 
   > Our main point of disagreement is, in what form the log is output. I prefer the latter, that is, re-implement the formatter method, customize our own log output format, and package the log into a lib for use by other modules.
   
   I think the log format is not up to us to decide 😄  . Since we're building a library, we need to leave it the users of our library, the applications, to decide which format they want. 
   
   Logrus seems it does a very good job at a few key things: 
    * Application can decide the formatting of logs. All the library it depends on, that are using Logrus, will immediately get configured.
    * Structured logging. This makes the log message much more organized. This is especially critical if an application wants to write logs in JSON format (which is trivial with Logrus), eg. for getting them into ElasticSearch or similar.
   
   > If, in the current way, we need to add the log field to most of the structs defined in the future, this will make things difficult.
   
   I think it makes the logs very consistent and organized. Every log message printed by the producer controller should contain the context of, for example, the topic name. As I mentioned above, in the refactoring you were already using 3 different ways to pass the topic name within few lines of code, while many other log message were missing the topic name context.
   This is normal, and we've been fighting around this in Java for long time, since we're constrained to Slf4J APIs. 
   
   Setting the context in the logger itself and storing it in the producer/consumer/connection/..., makes it easier to not forget the context and always have the same format.
   
   > Use logrus lib print:
   > time="2019-05-17T09:58:37+08:00" level=info msg="hello logrus"
   
   This gets printed when it's not on a terminal.
   
   > Printed log information after rewriting the Formatter:
   > 2019/05/17 10:00:25.530 test.go:9: [info] hello log
   
   If we use Logrus as it is, the users will be able to decide which format text vs json, and which fields in which order to present. This looks more powerful than any default setting we can put as default.

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