mirror of
https://github.com/tokio-rs/tokio.git
synced 2026-09-01 00:00:10 +02:00
David Kellum
c9532e49d7
* use dyn Trait syntax where appropriate recent rust nightly started warning that not using `dyn` was deprecated. This requires MSRV 1.27.0+. * rustfmt fallout from dyn additions * stop explicit allow of rust_2018_idioms * more dyn Trait syntax * drop tokio-macros from 0.1.x workspace Since tokio-macros specifies an edition=2018, we would otherwise require MSRV 1.31.0 to build/test it. And tokio-macros isn't used with tokio 0.1.x. * reactor: narrow tokio-io-pool dev dep to 0.1.4 Since 0.1.5-6 is now a edition=2018 crate, which has effective MSRV 1.31.0. * narrow tempfile dev-dep to avoid MSRV bump tempfile 3.1.0 pulls in rand 0.7.0 and is MSRV 1.32.0 * narrow flate2 dev-dep to avoid MSRV bump flate2 1.0.10-11 have MSRV 1.34.0. github refs: alexcrichton/flate2-rs#207 * fs: drop deprecated tempdir crate use in tests In particular because it pulls in old rand duplicates. Replace use with tempfile::tempdir() which has been available since tempfile 3.0.0. backport-of: #1312 * increase CI MSRV to 1.28.0
59 lines
1.8 KiB
Rust
59 lines
1.8 KiB
Rust
//! Hello world server.
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//!
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//! A simple client that opens a TCP stream, writes "hello world\n", and closes
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//! the connection.
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//!
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//! You can test this out by running:
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//!
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//! ncat -l 6142
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//!
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//! And then in another terminal run:
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//!
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//! cargo run --example hello_world
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#![deny(warnings)]
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extern crate tokio;
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use tokio::io;
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use tokio::net::TcpStream;
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use tokio::prelude::*;
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pub fn main() -> Result<(), Box<dyn std::error::Error>> {
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let addr = "127.0.0.1:6142".parse()?;
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// Open a TCP stream to the socket address.
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//
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// Note that this is the Tokio TcpStream, which is fully async.
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let client = TcpStream::connect(&addr)
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.and_then(|stream| {
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println!("created stream");
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io::write_all(stream, "hello world\n").then(|result| {
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println!("wrote to stream; success={:?}", result.is_ok());
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Ok(())
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})
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})
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.map_err(|err| {
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// All tasks must have an `Error` type of `()`. This forces error
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// handling and helps avoid silencing failures.
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//
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// In our example, we are only going to log the error to STDOUT.
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println!("connection error = {:?}", err);
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});
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// Start the Tokio runtime.
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//
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// The Tokio is a pre-configured "out of the box" runtime for building
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// asynchronous applications. It includes both a reactor and a task
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// scheduler. This means applications are multithreaded by default.
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//
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// This function blocks until the runtime reaches an idle state. Idle is
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// defined as all spawned tasks have completed and all I/O resources (TCP
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// sockets in our case) have been dropped.
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println!("About to create the stream and write to it...");
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tokio::run(client);
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println!("Stream has been created and written to.");
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Ok(())
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}
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