Ohkami

Ohkami - [狼] wolf in Japanese - is intuitive and declarative web framework.

• macro-less and type-safe APIs for intuitive and declarative code
• multiple runtimes are supported：tokio, async-std, smol, glommio, worker (Cloudflare Workers)

Benchmark Results

• Web Frameworks Benchmark

Quick Start

1. Add to dependencies :

[dependencies]
ohkami = { version = "0.20", features = ["rt_tokio"] }
tokio  = { version = "1",    features = ["full"] }

2. Write your first code with Ohkami : examples/quick_start

use ohkami::prelude::*;
use ohkami::typed::status;

async fn health_check() -> status::NoContent {
    status::NoContent
}

async fn hello(name: &str) -> String {
    format!("Hello, {name}!")
}

#[tokio::main]
async fn main() {
    Ohkami::new((
        "/healthz"
            .GET(health_check),
        "/hello/:name"
            .GET(hello),
    )).howl("localhost:3000").await
}

3. Run and check the behavior :

$ cargo run

$ curl http://localhost:3000/healthz
$ curl http://localhost:3000/hello/your_name
Hello, your_name!

Feature flags

"rt_tokio", "rt_async-std", "rt_smol", "rt_glommio"：native async runtime

• tokio
• async-std
• smol
• glommio

"rt_worker"：Cloudflare Workers

npm create cloudflare ./path/to/project -- --template https://github.com/ohkami-rs/ohkami-templates/worker

then your project directory has wrangler.toml, package.json and a Rust library crate. Local dev by npm run dev and deploy by npm run deploy !

See README of the template for details.

"sse"：Server-Sent Events

Ohkami responds with HTTP/1.1 Transfer-Encoding: chunked.
Use some reverse proxy to do with HTTP/2,3.

use ohkami::prelude::*;
use ohkami::typed::DataStream;
use ohkami::util::stream;
use {tokio::time::sleep, std::time::Duration};

async fn sse() -> DataStream<String> {
    DataStream::from_stream(stream::queue(|mut q| async move {
        for i in 1..=5 {
            sleep(Duration::from_secs(1)).await;
            q.add(format!("Hi, I'm message #{i} !"))
        }
    }))
}

#[tokio::main]
async fn main() {
    Ohkami::new((
        "/sse".GET(sse),
    )).howl("localhost:5050").await
}

"ws"：WebSocket

Ohkami only handles ws://.
Use some reverse proxy to do with wss://.

Currently, WebSocket on rt_worker is not supported.

use ohkami::prelude::*;
use ohkami::ws::{WebSocketContext, WebSocket, Message};

async fn echo_text(c: WebSocketContext<'_>) -> WebSocket {
    c.connect(|mut conn| async move {
        while let Ok(Some(Message::Text(text))) = conn.recv().await {
            conn.send(Message::Text(text)).await.expect("Failed to send text");
        }
    })
}

#[tokio::main]
async fn main() {
    Ohkami::new((
        "/ws".GET(echo_text),
    )).howl("localhost:3030").await
}

"nightly"：enable nightly-only functionalities

• try response

Snippets

Middlewares

Ohkami's request handling system is called "fangs", and middlewares are implemented on this.

builtin fang : CORS, JWT, BasicAuth, Timeout, Memory

use ohkami::prelude::*;

#[derive(Clone)]
struct GreetingFang;

/* utility trait; automatically impl `Fang` trait */
impl FangAction for GreetingFang {
    async fn fore<'a>(&'a self, req: &'a mut Request) -> Result<(), Response> {
        println!("Welcomm request!: {req:?}");
        Ok(())
    }
    async fn back<'a>(&'a self, res: &'a mut Response) {
        println!("Go, response!: {res:?}");
    }
}

#[tokio::main]
async fn main() {
    Ohkami::with(GreetingFang, (
        "/".GET(|| async {"Hello, fangs!"})
    )).howl("localhost:3000").await
}

Typed payload

builtin payload : JSON, Text, HTML, URLEncoded, Multipart

use ohkami::prelude::*;
use ohkami::typed::status;

/* Deserialize for request */
#[derive(Deserialize)]
struct CreateUserRequest<'req> {
    name:     &'req str,
    password: &'req str,
}

/* Serialize for response */
#[derive(Serialize)]
struct User {
    name: String,
}

async fn create_user(
    JSON(req): JSON<CreateUserRequest<'_>>
) -> status::Created<JSON<User>> {
    status::Created(JSON(
        User {
            name: String::from(req.name)
        }
    ))
}

Typed params

use ohkami::prelude::*;

#[tokio::main]
async fn main() {
    Ohkami::new((
        "/hello/:name"
            .GET(hello),
        "/hello/:name/:n"
            .GET(hello_n),
        "/search"
            .GET(search),
    )).howl("localhost:5000").await
}

async fn hello(name: &str) -> String {
    format!("Hello, {name}!")
}

async fn hello_n((name, n): (&str, usize)) -> String {
    vec![format!("Hello, {name}!"); n].join(" ")
}

#[derive(Deserialize)]
struct SearchQuery<'q> {
    #[serde(rename = "q")]
    keyword: &'q str,
    lang:    &'q str,
}

#[derive(Serialize)]
struct SearchResult {
    title: String,
}

async fn search(
    Query(query): Query<SearchQuery<'_>>
) -> JSON<Vec<SearchResult>> {
    JSON(vec![
        SearchResult { title: String::from("ohkami") },
    ])
}

Static directory serving

use ohkami::prelude::*;

#[tokio::main]
async fn main() {
    Ohkami::new((
        "/".Dir("./dist"),
    )).howl("0.0.0.0:3030").await
}

File upload

use ohkami::prelude::*;
use ohkami::typed::status;
use ohkami::format::{Multipart, File};

#[derive(Deserialize)]
struct FormData<'req> {
    #[serde(rename = "account-name")]
    account_name: Option<&'req str>,
    pics: Vec<File<'req>>,
}

async fn post_submit(
    Multipart(data): Multipart<FormData<'_>>
) -> status::NoContent {
    println!("\n\
        ===== submit =====\n\
        [account name] {:?}\n\
        [  pictures  ] {} files (mime: [{}])\n\
        ==================",
        data.account_name,
        data.pics.len(),
        data.pics.iter().map(|f| f.mimetype).collect::<Vec<_>>().join(", "),
    );

    status::NoContent
}

Pack of Ohkamis

use ohkami::prelude::*;
use ohkami::typed::status;

#[derive(Serialize)]
struct User {
    name: String
}

async fn list_users() -> JSON<Vec<User>> {
    JSON(vec![
        User { name: String::from("actix") },
        User { name: String::from("axum") },
        User { name: String::from("ohkami") },
    ])
}

async fn create_user() -> status::Created<JSON<User>> {
    status::Created(JSON(User {
        name: String::from("ohkami web framework")
    }))
}

async fn health_check() -> status::NoContent {
    status::NoContent
}

#[tokio::main]
async fn main() {
    // ...

    let users_ohkami = Ohkami::new((
        "/"
            .GET(list_users)
            .POST(create_user),
    ));

    Ohkami::new((
        "/healthz"
            .GET(health_check),
        "/api/users"
            .By(users_ohkami), // nest by `By`
    )).howl("localhost:5000").await
}

Testing

use ohkami::prelude::*;
use ohkami::testing::*; // <--

fn hello_ohkami() -> Ohkami {
    Ohkami::new((
        "/hello".GET(|| async {"Hello, world!"}),
    ))
}

#[cfg(test)]
#[tokio::test]
async fn test_my_ohkami() {
    let t = hello_ohkami().test();

    let req = TestRequest::GET("/");
    let res = t.oneshot(req).await;
    assert_eq!(res.status(), Status::NotFound);

    let req = TestRequest::GET("/hello");
    let res = t.oneshot(req).await;
    assert_eq!(res.status(), Status::OK);
    assert_eq!(res.text(), Some("Hello, world!"));
}

Supported protocols

• HTTP/1.1
• HTTP/2
• HTTP/3
• HTTPS
• Server-Sent Events
• WebSocket

MSRV ( Minimum Supported Rust Version )

Latest stable

License

ohkami is licensed under MIT LICENSE ( LICENSE or https://opensource.org/licenses/MIT ).