How to create request body logging middleware?

[alloc33]

I tried to find it in docs but nothing helpful was there regarding this particular case. I want to create I simple middleware (fairing) which would print request body parameters if request body exists. How can I do it?

[SergioBenitez]

request body parameters

What do you mean by this?

If you want to log the entire request body, that isn't currently possible as Rocket enforces that the request body (Data) is streamed. Logging the body would necessitate 1) buffering the entire, possibly infinite request body in memory, a trivial vector for a DoS attack, or 2) preventing handlers down the line from reading the request body.

If you're okay with only logging some part of the request body, you can use a fairing along with Data::peek():

rocket::build().attach(AdHoc::on_request("Body Logger", |_req, data| Box::pin(async {
   log!("{:?}", data.peek(512).await);
})));