mirror of
https://github.com/tokio-rs/tokio.git
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Eliza Weisman
30330da11a
* chore: Fix examples not working with `cargo run` ## Motivation PR #991 moved the `tokio` crate to its own subdirectory, but did not move the `examples` directory into `tokio/examples`. While attempting to use the examples for testing another change, I noticed that #991 had broken the ability to use `cargo run`, as the examples were no longer considered part of a crate that cargo was aware of: ``` tokio on master [$] via 🦀v1.33.0 at ☸️ aks-eliza-dev ➜ cargo run --example chat error: no example target named `chat` Did you mean `echo`? ``` ## Solution This branch moves the examples into the `tokio` directory, so cargo is now once again aware of them: ``` tokio on eliza/fix-examples [$] via 🦀v1.33.0 at ☸️ aks-eliza-dev ➜ cargo run --example chat Compiling tokio-executor v0.1.7 (/Users/eliza/Code/tokio/tokio-executor) Compiling tokio-reactor v0.1.9 Compiling tokio-threadpool v0.1.13 Compiling tokio-current-thread v0.1.6 Compiling tokio-timer v0.2.10 Compiling tokio-uds v0.2.5 Compiling tokio-udp v0.1.3 Compiling tokio-tcp v0.1.3 Compiling tokio-fs v0.1.6 Compiling tokio v0.1.18 (/Users/eliza/Code/tokio/tokio) Finished dev [unoptimized + debuginfo] target(s) in 7.04s Running `target/debug/examples/chat` server running on localhost:6142 ``` Signed-off-by: Eliza Weisman <[email protected]> Signed-off-by: Eliza Weisman <[email protected]>
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<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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