https://github.com/krtab/tower_type_steer

https://github.com/krtab/tower_type_steer

Last synced: about 1 year ago
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• Host: GitHub
• URL: https://github.com/krtab/tower_type_steer
• Owner: krtab
• Created: 2024-10-05T09:05:49.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2024-10-05T09:23:49.000Z (over 1 year ago)
• Last Synced: 2025-03-29T21:47:14.491Z (about 1 year ago)
• Language: Rust
• Size: 2.93 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
Dispatch request to service by trying to convert to the service's request type.

```rust

use futures::future::ready;

use serde::Deserialize;

use tower::{service_fn, Service, ServiceBuilder, ServiceExt};

use tower_type_steer::Converter;

#[derive(Deserialize, Clone)]

struct Foo {

    x: i8,

    y: i8,

}

#[derive(Deserialize, Clone)]

struct Bar {

    z: i8,

}

fn main() {

    //  impl Service

    let foo_service = service_fn(|foo: Foo| ready(foo.x.checked_add(foo.y).ok_or("Overflow")));

    //  impl Service

    let bar_service = service_fn(|bar: Bar| ready(Ok::<_, &'static str>(bar.z)));

    let error_service = service_fn(|_: &str| ready(Err::("No matching json")));

    let mut s = ServiceBuilder::new()

        .layer(tower_type_steer::serde_conv::json().wrap(foo_service))

        .layer(tower_type_steer::serde_conv::json().wrap(bar_service))

        .service(error_service);

    let res: Result<_, &str> = futures::executor::block_on(async move {

        let s = s.ready().await?;

        let res = [

            // Ok(5) (foo_service)

            s.call(r#"{"x": 3, "y": 2}"#).await,

            // Err("Overflow") (foo_service)

            s.call(r#"{"x": 120, "y": 120}"#).await,

            // Err("Ok(2)") (bar_service)

            s.call(r#"{"z": 2}"#).await,

            // Err("No matching json") (error_service)

            s.call(r#"{}"#).await,

        ];

        Ok(res)

    });

    println!("{res:?}");

}

```