lxy 0.1.1

A convenient async http and RPC framework in Rust
Documentation 
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use std::{
  future::Future,
  pin::Pin,
  task::{Context, Poll},
};

use http::Request;
use tonic::{body::Body, metadata::MetadataMap};
use tower::Service;

use crate::context::{RequestContext, layer::ContextService, run_with_context};

type GrpcRequest = Request<Body>;

impl<S> Service<GrpcRequest> for ContextService<S>
where
  S: Service<GrpcRequest> + Clone + Send + 'static,
  S::Future: Send,
{
  type Response = S::Response;
  type Error = S::Error;
  type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;

  fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
    self.inner.poll_ready(cx)
  }

  fn call(&mut self, req: GrpcRequest) -> Self::Future {
    let inner = self.inner.clone();
    let mut inner = std::mem::replace(&mut self.inner, inner);
    let metadata = MetadataMap::from_headers(req.headers().clone());
    let ctx = RequestContext::from_grpc(&metadata);

    Box::pin(async move { run_with_context(ctx, inner.call(req)).await })
  }
}

#[cfg(test)]
mod tests {
  use super::*;
  use crate::context::{get_context, layer::ContextLayer};
  use tonic::body::Body;
  use tower::{Layer, ServiceExt};

  #[tokio::test]
  async fn test_grpc_context_layer_with_request_id() {
    let layer = ContextLayer;
    let service = layer.layer(tower::service_fn(|_req: GrpcRequest| async {
      let ctx = get_context().expect("get_context should work within context layer");
      let request_id = ctx.request_id().to_string();
      assert_eq!(request_id, "grpc-test-123");
      Ok::<_, std::convert::Infallible>(http::Response::new(Body::empty()))
    }));

    let req = Request::builder()
      .uri("/test.Service/Method")
      .method("POST")
      .header("x-request-id", "grpc-test-123")
      .body(Body::empty())
      .unwrap();

    let response: http::Response<Body> = service.oneshot(req).await.unwrap();
    assert_eq!(response.status(), 200);
  }

  #[tokio::test]
  async fn test_grpc_context_layer_auto_generate_request_id() {
    let layer = ContextLayer;
    let service = layer.layer(tower::service_fn(|_req: GrpcRequest| async {
      let ctx = get_context().expect("get_context should work within context layer");
      let request_id = ctx.request_id().to_string();
      assert!(!request_id.is_empty());
      Ok::<_, std::convert::Infallible>(http::Response::new(Body::empty()))
    }));

    let req = Request::builder()
      .uri("/test.Service/Method")
      .method("POST")
      .body(Body::empty())
      .unwrap();

    let response: http::Response<Body> = service.oneshot(req).await.unwrap();
    assert_eq!(response.status(), 200);
  }
}