Easy and fast communication between processes, threads and systems.

Sender/Receiver types for communicating with a channel-like API across generic IO streams. It takes the burden on serializing, deserializing and transporting data off your back and let's you focus on the important logic of your project.

Contents

• Contents
• Examples
• Features
• How it works
• License

Examples

[dependencies.channels]
version = "0.13"
features = ["full"]

use tokio::net::TcpStream;

use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize)]
enum Message {
    Ping,
    Pong
}

#[tokio::main]
async fn main() {
    let stream = TcpStream::connect("127.0.0.1:8080").await.unwrap();
    let (r, w) = stream.into_split();
    let (mut tx, mut rx) = channels::channel::<Message, _, _>(r, w);

    loop {
        match rx.recv().await.unwrap() {
            Message::Ping => {
                println!("pinged!");
                tx.send(Message::Pong).await.unwrap();
            }
            Message::Pong => {
                println!("ponged!");
            }
        }
    }
}

For more, see: examples/

Features

Flag	Description
aead	Encrypt and authenticate data with ring::aead.
bincode	Serialize/Deserialize data with bincode. (Enabled by default)
borsh	Serialize/Deserialize data with borsh.
cbor	Serialize/Deserialize data with ciborium.
core2	Support for core2::io::{Read, Write}.
crc	Validate data with a CRC checksum.
deflate	Compress data with DEFLATE.
embedded-io	Support for embedded_io::{Read, Write}.
full-io	Enable support for all of the IO traits.
full-serdes	Enable features: aead, bincode, borsh, cbor, crc, deflate, hmac, json.
futures	Support for futures::io::{AsyncRead, AsyncWrite}.
hmac	Authenticate data with a HMAC using ring::hmac.
json	Serialize/Deserialize data with serde_json.
smol	Support for smol::io::{AsyncRead, AsyncWrite}.
statistics	Collect IO metrics such as total bytes sent/received. See: Statistics.
std	Support for std::io::{Read, Write}. If disabled also makes the crate no_std. (Enabled by default)
tokio	Support for tokio::io::{AsyncRead, AsyncWrite}.

No two features of the crate are mutually exclusive. Instead, everything is implemented in a way to be infinitely extensible. This means, that even if you have other IO traits or another way to serialize or deserialize data, you can either add support for them directly in your own project by using the rich type system.

How it works

Channels implements a communication protocol that allows sending and receiving data in frames. The main API of the crate is intended to work over IO traits. However, if desired, the logic of the underlying protocol is available standalone without coupling it to the usage of any IO traits. It works over any stream synchronous or asynchronous with first class support for following IO traits:

• std::io::{Read, Write}
• tokio::io::{AsyncRead, AsyncWrite}
• futures::io::{AsyncRead, AsyncWrite}
• core2::io::{Read, Write}
• smol::io::{AsyncRead, AsyncWrite}
• embedded_io::{Read, Write}

Support for each IO trait can be enabled via the corresponding feature flag. See: Features. You can read more about how the underlying communication protocol works here.

License

• All code in this repository is licensed under the MIT license, a copy of which can be found here.

• All artwork in this repository is licensed under Creative Commons Attribution-NonCommercial 4.0 International. A copy of the license can be found here.