[question] How to use the option when initialize the middleware

[Ce Gao]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind question

I implement a customized middleware to add the DB interface to the context, and the middleware supports different DB backends (e.g. SQLite3, MySQL and so on), thus I use the option to let users define the backend.

But, I found that we cannot use the option before cmd.ExecuteWithConfig, since the values will all be empty before the command is actually run. While the middleware should be configured before the cmd is run, I am not sure if we could use the option in middleware in the current design. Do you have any suggestion?

I'd appreciate it if you could answer.

[Wei Guo]

Middleware is a concept of router. You need to implement a plugin witch install a db middleware to router.

Here is the document which describes how to implement plugins: https://caicloud.github.io/nirvana/zh-hans/concepts/plugin.html

Also you can find an example at: https://github.com/caicloud/nirvana/blob/master/plugins/reqlog/reqlog.go

[Ce Gao]

Thanks, gotcha. I implemented a middleware directly. It seems that I misunderstand the concept of middleware. I will take a look.