# async-tungstenite

Asynchronous WebSockets for [async-std](https://async.rs),
[tokio](https://tokio.rs), [gio](https://gtk-rs.org) and any `std`
`Future`s runtime.

[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
[![Crates.io](https://img.shields.io/crates/v/async-tungstenite.svg?maxAge=2592000)](https://crates.io/crates/async-tungstenite)
[![Build Status](https://github.com/sdroege/async-tungstenite/workflows/CI/badge.svg)](https://github.com/sdroege/async-tungstenite/actions?query=workflow%3ACI)

[Documentation](https://docs.rs/async-tungstenite)

## Usage

Add this in your `Cargo.toml`:

```toml
[dependencies]
async-tungstenite = "*"
```

Take a look at the `examples/` directory for client and server examples. You
may also want to get familiar with [async-std](https://async.rs/) or
[tokio](https://tokio.rs) if you don't have any experience with it.

## What is async-tungstenite?

This crate is based on [tungstenite](https://crates.io/crates/tungstenite)
Rust WebSocket library and provides async bindings and wrappers for it, so you
can use it with non-blocking/asynchronous `TcpStream`s from and couple it
together with other crates from the async stack. In addition, optional
integration with various other crates can be enabled via feature flags

 * `async-tls`: Enables the `async_tls` module, which provides integration
   with the [async-tls](https://crates.io/crates/async-tls) TLS stack and can
   be used independent of any async runtime.
 * `async-std-runtime`: Enables the `async_std` module, which provides
   integration with the [async-std](https://async.rs) runtime.
 * `async-native-tls`: Enables the additional functions in the `async_std`
   module to implement TLS via
   [async-native-tls](https://crates.io/crates/async-native-tls).
 * `tokio-runtime`: Enables the `tokio` module, which provides integration
   with the [tokio](https://tokio.rs) runtime.
 * `tokio-native-tls`: Enables the additional functions in the `tokio` module to
   implement TLS via [tokio-native-tls](https://crates.io/crates/tokio-native-tls).
 * `tokio-rustls-native-certs`: Enables the additional functions in the `tokio` 
   module to implement TLS via [tokio-rustls](https://crates.io/crates/tokio-rustls)
   and uses native system certificates found with
   [rustls-native-certs](https://github.com/rustls/rustls-native-certs).
 * `tokio-rustls-webpki-roots`: Enables the additional functions in the `tokio` 
   module to implement TLS via [tokio-rustls](https://crates.io/crates/tokio-rustls)
   and uses the certificates [webpki-roots](https://github.com/rustls/webpki-roots)
   provides.
 * `gio-runtime`: Enables the `gio` module, which provides integration with
   the [gio](https://gtk-rs.org) runtime.

## Messages vs Streaming

WebSocket provides a message-oriented protocol, and this crate supports sending
and receiving data in messages; protocols built on WebSocket are allowed to
make message boundaries semantically significant. However, some users of
WebSocket may want to treat the socket as a continuous stream of bytes. If you
know the sending end does not place significance on message boundaries, and you
want to process a stream of bytes without regard to those boundaries, try
[`ws_stream_tungstenite`](https://crates.io/crates/ws_stream_tungstenite),
which builds upon this crate.

## tokio-tungstenite

Originally this crate was created as a fork of
[tokio-tungstenite](https://github.com/snapview/tokio-tungstenite) and ported
to the traits of the [`futures`](https://crates.io/crates/futures) crate.
Integration into async-std, tokio and gio was added on top of that.