HTTP integration with actix-web

The "http_actix_web" feature flag should be toggled on to enable HTTP integration with actix-web. Enabling "http_actix_web" feature flag will also enable the "tokio_runtime" feature flag.

A convenience method Server::handle_http() is available when "http_actix_web" is the only enabled http integration feature flag. If you have multiple http integration feature flags enabled, you can use the Server::scope_config method instead (please note that you should use scope_config without brackets).

We will demonstrate the usage with a new example.

[dependencies]
actix-web = "3.3.2"
toy-rpc = { version = "0.7.5", features = ["http_actix_web", "server"] }

use std::sync::Arc;
use toy_rpc::macros::export_impl;
use toy_rpc::Server;
use actix_web::{web, HttpServer, App};

pub struct Calculator { }

#[export_impl]
impl Calculator {
    #[export_method]
    async fn multiply(&self, args(i32, i32)) -> Result<i32, String> {
        Ok(args.0 * args.1)
    }

    #[export_method]
    async fn divide(&self, args(i32, i32)) -> Result<i32, String> {
        Ok(args.0 / args.1)
    }
}

#[actix_web::main]
async fn main() {
    let addr = "127.0.0.1:23333";
    let calculator = Arc::new(Calculator { });
    let server = Server::builder()
        .register(calculator)
        .build();

    let app_data = web::Data::new(server);

    HttpServer::new(
        move || {
            App::new()
                .service(
                    web::scope("/rpc/")
                        .app_data(app_data.clone())
                        .configure(Server::handle_http()) // equivalent to the line below
                        // .configure(Server::scope_config)
                )
        }
    )
    .bind(addr).unwrap()
    .run()
    .await;
}