Async/Await Migration

[plwai]

Implement Async/Await to bring better developer experience.

Currently, Async/Await drastically lower down the performance within hyper. In Obsidian there is one part consumes a lot of resource too.

let service = make_service_fn(|_| {
    let server_clone = app_server.clone();
    async {
        Ok::<_, hyper::Error>(service_fn(move |req| {
            // This clone takes time to complete as it will be call every endpoint request invoked
            let server_clone = server_clone.clone(); 
            async move { Ok::<_, hyper::Error>(server_clone.resolve_endpoint(req).await) }
        }))
    }
});

[plwai]

Benchmark

using ./ab.exe -n 1000000 -k -c 8 http://localhost:3000/ with one core. The hyper with async/await is slower than the one before. For the issue stated above, it has been resolved and the result is shown below. It has a significant boost after eliminating clone process.

Hyper and Obsidian (Hello world)

Obsidian Hello World

Hyper Hello World

Obsidian before and after optimization

Obsidian Example before removing clone

Obsidian Example after removing clone

Hyper and Obsidian (Before Async/Await)

Hyper before async/await

Obsidian before async/await

[jk-gan]

Closing this issue as #32 is merged.