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Tokio is an event-driven, non-blocking I/O platform for writing asynchronous applications with the Rust programming language. At a high level, it provides a few major components:
These components provide the runtime components necessary for building an asynchronous application.
A basic TCP echo server with Tokio:
extern crate tokio; use tokio::prelude::*; use tokio::io::copy; use tokio::net::TcpListener; fn main() { // Bind the server's socket. let addr = "127.0.0.1:12345".parse().unwrap(); let listener = TcpListener::bind(&addr) .expect("unable to bind TCP listener"); // Pull out a stream of sockets for incoming connections let server = listener.incoming() .map_err(|e| eprintln!("accept failed = {:?}", e)) .for_each(|sock| { // Split up the reading and writing parts of the // socket. let (reader, writer) = sock.split(); // A future that echos the data and returns how // many bytes were copied... let bytes_copied = copy(reader, writer); // ... after which we'll print what happened. let handle_conn = bytes_copied.map(|amt| { println!("wrote {:?} bytes", amt) }).map_err(|err| { eprintln!("IO error {:?}", err) }); // Spawn the future as a concurrent task. tokio::spawn(handle_conn) }); // Start the Tokio runtime tokio::run(server); }
More examples can be found here.
First, see if the answer to your question can be found in the [Guides] or the [API documentation]. If the answer is not there, there is an active community in the Tokio Gitter channel. We would be happy to try to answer your question. Last, if that doesn't work, try opening an issue with the question.
Tokio is built against the latest stable, nightly, and beta Rust releases. The minimum version supported is the stable release from three months before the current stable release version. For example, if the latest stable Rust is 1.29, the minimum version supported is 1.26. The current Tokio version is not guaranteed to build on Rust versions earlier than the minimum supported version.
This project is licensed under the MIT license.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.