I/O HTTP

Set of I/O-free Rust coroutines to manage HTTP streams, based on io-stream.

This library allows you to manage HTTP streams using an I/O-agnostic approach, based on 3 concepts:

Coroutine

A coroutine is an I/O-free, resumable and composable state machine that emits I/O requests. A coroutine is considered terminated when it does not emit I/O requests anymore.

See available coroutines at ./src/coroutines.

Runtime

A runtime contains all the I/O logic, and is responsible for processing I/O requests emitted by coroutines.

See available runtimes at io-stream.

Loop

The loop is the glue between coroutines and runtimes. It makes the coroutine progress while allowing runtime to process I/O.

Examples

See complete examples at ./examples.

Send HTTPS request via rustls synchronously

use std::{net::TcpStream, sync::Arc};

use io_http::{coroutines::Send, Request};
use io_stream::runtimes::std::handle;
use rustls::{ClientConfig, ClientConnection, StreamOwned};
use rustls_platform_verifier::ConfigVerifierExt;

// build TLS stream
let domain = "github.com"
let config = ClientConfig::with_platform_verifier();
let server_name = domain.to_string().try_into().unwrap();
let conn = ClientConnection::new(Arc::new(config), server_name).unwrap();
let tcp = TcpStream::connect((domain, 443)).unwrap();
let tls = StreamOwned::new(conn, tcp);

// send request send receive response
let request = Request::new("GET", "/", "1.0").body("");

let mut arg = None;
let mut send = Send::new(request);

let response = loop {
    match send.next() {
        Ok(response) => break response,
        Err(io) => arg = Some(handle(&mut stream, io).unwrap()),
    }
};

See complete example at ./examples/send.rs.

cargo run --example send

More examples

Have a look at projects built on the top of this library:

• TODO

Sponsoring

Special thanks to the NLnet foundation and the European Commission that helped the project to receive financial support from various programs:

• NGI Assure in 2022
• NGI Zero Entrust in 2023
• NGI Zero Core in 2024 (still ongoing)

If you appreciate the project, feel free to donate using one of the following providers: