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docs(server): add server example using tower::make::Shared (#2440)

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`tower` 0.4.5 introduced `Shared` which is a `MakeService` that produces
services by cloning an inner service. This works quite well with `hyper`
if your service doesn't need the incoming connection and implements
`Clone`.

However that might not be entirely obvious so I thought it made sense to
add an example to the docs.

I wasn't quite sure if the example should go in the server or service
module docs but since there already is an example using
`make_service_fn` in the server docs I opted to add it there. Let me
know if you'd rather have it somewhere else.
This commit is contained in:
David Pedersen
2021-02-19 22:50:43 +01:00
committed by GitHub
parent f01de8e503
commit 6efc1a1cce
2 changed files with 36 additions and 0 deletions
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1
Cargo.toml
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@@ -66,6 +66,7 @@ tokio = { version = "1", features = [
] }
tokio-test = "0.4"
tokio-util = { version = "0.6", features = ["codec"] }
tower = { version = "0.4", features = ["make"] }
tower-util = "0.3"
url = "2.2"

35
src/server/mod.rs
View File

@@ -50,6 +50,41 @@
//! # #[cfg(not(feature = "runtime"))]
//! # fn main() {}
//! ```
//!
//! If you don't need the connection and your service implements `Clone` you can use
//! [`tower::make::Shared`] instead of `make_service_fn` which is a bit simpler:
//!
//! ```no_run
//! # use std::convert::Infallible;
//! # use std::net::SocketAddr;
//! # use hyper::{Body, Request, Response, Server};
//! # use hyper::service::{make_service_fn, service_fn};
//! # use tower::make::Shared;
//! # async fn handle(_req: Request<Body>) -> Result<Response<Body>, Infallible> {
//! # Ok(Response::new(Body::from("Hello World")))
//! # }
//! # #[cfg(feature = "runtime")]
//! #[tokio::main]
//! async fn main() {
//! // Construct our SocketAddr to listen on...
//! let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
//!
//! // Shared is a MakeService that produces services by cloning an inner service...
//! let make_service = Shared::new(service_fn(handle));
//!
//! // Then bind and serve...
//! let server = Server::bind(&addr).serve(make_service);
//!
//! // And run forever...
//! if let Err(e) = server.await {
//! eprintln!("server error: {}", e);
//! }
//! }
//! # #[cfg(not(feature = "runtime"))]
//! # fn main() {}
//! ```
//!
//! [`tower::make::Shared`]: https://docs.rs/tower/latest/tower/make/struct.Shared.html
pub mod accept;