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//! The request handler abstraction.

use crate::proto::{Request, Response};

/// Turns a [`Request`] into a [`Response`].

///

/// The trait is deliberately **synchronous**: the engine is sans-I/O and every

/// runtime (thread pool, tokio, mio) calls the handler the same way, so a

/// single handler implementation works everywhere. Handlers must be `Send +

/// Sync` because they are shared across worker threads / tasks.

pub trait Handler: Send + Sync {

/// Handle one request and produce the response to send back.

fn handle(&self, req: &Request) -> Response;

}

/// Any `Fn(&Request) -> Response` is a handler.

impl<F> Handler for F

where

F: Fn(&Request) -> Response + Send + Sync,

{

fn handle(&self, req: &Request) -> Response {

(self)(req)

}