rustolio-rpc 0.1.0

An RPC extention for the HTTP-Server
Documentation 
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//
// SPDX-License-Identifier: MPL-2.0
//
// Copyright (c) 2026 Tobias Binnewies. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//

use rustolio_utils::http;
use rustolio_utils::threadsafe::Threadsafe;

// pub trait Middleware<B, C, N>: Threadsafe {
//     fn handle(
//         &self,
//         req: http::Request<B>,
//         ctx: &'static C,
//         next: N,
//     ) -> impl std::future::Future<Output = http::Result> + Threadsafe;
// }
// struct MiddlewareImpl<F, B, C, Fut, N> {
//     f: F,
//     _marker: std::marker::PhantomData<(B, C, Fut, N)>,
// }
// impl<F, B, C, Fut, N> Middleware<B, C, N> for MiddlewareImpl<F, B, C, Fut, N>
// where
//     B: hyper::body::Body + Threadsafe,
//     C: Threadsafe,
//     F: Threadsafe + Fn(http::Request<B>, &'static C, N) -> Fut,
//     Fut: std::future::Future<Output = http::Result> + Threadsafe,
//     N: Next<B, C>,
// {
//     fn handle(
//         &self,
//         req: http::Request<B>,
//         ctx: &'static C,
//         next: N,
//     ) -> impl std::future::Future<Output = http::Result> + Threadsafe {
//         (self.f)(req, ctx, next)
//     }
// }
// impl<F, B, C, Fut, N> From<F> for MiddlewareImpl<F, B, C, Fut, N>
// where
//     B: hyper::body::Body + Threadsafe,
//     C: Threadsafe,
//     F: Threadsafe + Fn(http::Request<B>, &'static C, N) -> Fut,
//     Fut: std::future::Future<Output = http::Result> + Threadsafe,
//     N: Next<B, C>,
// {
//     fn from(f: F) -> Self {
//         MiddlewareImpl {
//             f,
//             _marker: std::marker::PhantomData,
//         }
//     }
// }

pub trait Next<B, C>: Threadsafe {
    fn call(
        &self,
        req: http::Request<B>,
        ctx: &'static C,
    ) -> impl std::future::Future<Output = http::Result<http::Response>> + Threadsafe;
}

#[doc(hidden)]
pub struct NextImpl<F, B, C, Fut> {
    f: F,
    _marker: std::marker::PhantomData<(B, C, Fut)>,
}

impl<F, B, C, Fut> Next<B, C> for NextImpl<F, B, C, Fut>
where
    B: hyper::body::Body + Threadsafe,
    C: Threadsafe,
    F: Threadsafe + Fn(http::Request<B>, &'static C) -> Fut,
    Fut: std::future::Future<Output = http::Result<http::Response>> + Threadsafe,
{
    fn call(
        &self,
        req: http::Request<B>,
        ctx: &'static C,
    ) -> impl std::future::Future<Output = http::Result<http::Response>> + Threadsafe {
        (self.f)(req, ctx)
    }
}

impl<F, B, C, Fut> From<F> for NextImpl<F, B, C, Fut>
where
    B: hyper::body::Body + Threadsafe,
    C: Threadsafe,
    F: Threadsafe + Fn(http::Request<B>, &'static C) -> Fut,
    Fut: std::future::Future<Output = http::Result<http::Response>> + Threadsafe,
{
    fn from(f: F) -> Self {
        NextImpl {
            f,
            _marker: std::marker::PhantomData,
        }
    }
}

#[cfg(test)]
mod tests {
    use http::{HeaderName, StatusCode};
    use http_body_util::BodyExt as _;

    use super::*;

    async fn middleware(
        req: http::Request<http_body_util::Full<hyper::body::Bytes>>,
        ctx: &'static String,
        next: impl Next<http_body_util::Full<hyper::body::Bytes>, String>,
    ) -> http::Result<http::Response> {
        let auth_header = req.header(HeaderName::AUTHORIZATION).unwrap();
        assert_eq!(auth_header, "token");
        next.call(req, ctx).await
    }

    async fn endpoint(
        req: http::Request<http_body_util::Full<hyper::body::Bytes>>,
        ctx: &String,
    ) -> http::Result<http::Response> {
        let req = req.text().await?;
        let text = req.into_body();
        Ok(http::Response::builder()
            .status(StatusCode::OK)
            .text(format!("Req: {}, Ctx: {}", text, ctx))
            .build()
            .unwrap())
    }

    #[tokio::test]
    async fn test_middleware_endpoint_creation() {
        let ctx: &'static String = Box::leak(Box::new("TestContext".to_string()));
        // let middleware = MiddlewareImpl::from(middleware);
        let endpoint = NextImpl::from(endpoint);
        let handler = |req, ctx| Box::pin(middleware(req, ctx, endpoint));

        let res = handler(
            http::Request::post("/test")
                .header(HeaderName::AUTHORIZATION, "token")
                .body(http_body_util::Full::new(hyper::body::Bytes::from(
                    "This is a string message",
                )))
                .build()
                .unwrap(),
            &ctx,
        )
        .await
        .unwrap();

        let res_body =
            String::from_utf8(res.into_body().collect().await.unwrap().to_bytes().to_vec())
                .unwrap();
        assert_eq!(res_body, "Req: This is a string message, Ctx: TestContext");
    }
}