Rust version : 1.39 nightly; Actix-web version : 1.0.7
http_srv.rs :
use futures01::stream::Stream;
use futures01::sync::mpsc;
use futures01::future::{ Future};
use futures::future::{ FutureExt, TryFutureExt};
use futures::compat::{Stream01CompatExt};
use futures::stream::TryStreamExt; // for `try_next`
use actix_web::*;
use bytes::Bytes;
use std::time::Duration;
use futures_timer::Delay;
fn inbound(req: HttpRequest, stream: web::Payload) -> impl Future<Item=HttpResponse, Error=Error> {
let fu = async_inbound(&req, &stream);
fu.unit_error().boxed_local().compat() // <--- compliation error here.
}
async fn async_inbound(req: &HttpRequest, stream: &web::Payload) -> HttpResponse {
let mut compatStream = stream.compat();
loop {
let result = compatStream.try_next().await;
if let Err(e) = result {
warn!("Failed to read stream from {} : {}", req.path(), e);
break;
}
if let Ok(option) = result {
match option {
None => {
info!("Request ends");
break;
},
Some(data) => {
println!("{:?}", data);
},
}
}
}
HttpResponse::Ok().content_type("text/html").body("RESP")
}
pub fn start(port : u16){
info!("Starting HTTP server listening at port {} ...", port);
let _ = HttpServer::new(|| {
App::new()
.wrap(middleware::DefaultHeaders::new().header(http::header::CACHE_CONTROL, "no-cache"))
.wrap(middleware::Logger::default())
.service(
web::resource("/")
.route(web::put().to_async(inbound)),
)
})
.bind(format!("0.0.0.0:{}", port))
.expect(&format!("Unable to bind on port {}", port))
.run()
.expect("Failed to start HTTP server");
}
I want to take use of async
function to parse inbound stream progressively. But actix-web requires impl Future<Item=HttpResponse, Error=Error>
as return value.
How can I convert future returned by async
function to what actix-web requires?
cargo.toml :
[dependencies]
log = "0.4.8"
env_logger = "0.6.2"
chrono = "0.4.8"
actix = "0.8.3"
bytes = "0.4.12"
actix-utils = "0.4.5"
futures-timer = "0.3"
futures01 = { package = "futures", version = "0.1", optional = false }
[dependencies.actix-web]
version = "1.0.7"
features = ["ssl"]
# https://rust-lang-nursery.github.io/futures-rs/blog/2019/04/18/compatibility-layer.html
# Rust’s futures ecosystem is currently split in two:
# On the one hand we have the vibrant ecosystem built around futures@0.1 with its many libraries working on stable Rust
# and on the other hand there’s std::future ecosystem with support for the ergonomic and powerful async/await language feature.
# To bridge the gap between these two worlds we have introduced a compatibility layer as part of the futures@0.3 extension to std::future.
[dependencies.futures-preview]
version = "0.3.0-alpha.18"
default-features = false
features = ["compat", "async-await", "nightly"]
Compliation Error :
error[E0271]: type mismatch resolving `<std::pin::Pin<std::boxed::Box<dyn core::future::future::Future<Output = std::result::Result<actix_http::response::Response, ()>>>> as core::future::future::Future>::Output == std::result::Result<_, actix_http::error::Error>`
--> src/http_server.rs:39:55
|
39 | fn inbound(req: HttpRequest, stream: web::Payload) -> impl Future<Item=HttpResponse, Error=Error> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected (), found struct `actix_http::error::Error`
|
= note: expected type `std::result::Result<actix_http::response::Response, ()>`
found type `std::result::Result<_, actix_http::error::Error>`
= note: required because of the requirements on the impl of `futures_core::future::TryFuture` for `std::pin::Pin<std::boxed::Box<dyn core::future::future::Future<Output = std::result::Result<actix_http::response::Response, ()>>>>`
= note: the return type of a function must have a statically known size
Best Regards