6ae5889f83
The `hyper::rt::Executor` trait allows defining custom executors to be used with hyper's `Client` and `Server`. Closes #1944 BREAKING CHANGE: Any type passed to the `executor` builder methods must now implement `hyper::rt::Executor`. `hyper::rt::spawn` usage should be replaced with `tokio::task::spawn`. `hyper::rt::run` usage should be replaced with `#[tokio::main]` or managing a `tokio::runtime::Runtime` manually.
75 lines
2.0 KiB
Rust
75 lines
2.0 KiB
Rust
#![deny(warnings)]
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use std::cell::Cell;
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use std::rc::Rc;
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use hyper::{Body, Error, Response, Server};
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use hyper::service::{make_service_fn, service_fn};
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fn main() {
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pretty_env_logger::init();
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// Configure a runtime that runs everything on the current thread
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let mut rt = tokio::runtime::Builder::new()
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.enable_all()
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.basic_scheduler()
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.build()
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.expect("build runtime");
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// Combine it with a `LocalSet, which means it can spawn !Send futures...
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let local = tokio::task::LocalSet::new();
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local.block_on(&mut rt, run());
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}
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async fn run() {
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let addr = ([127, 0, 0, 1], 3000).into();
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// Using a !Send request counter is fine on 1 thread...
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let counter = Rc::new(Cell::new(0));
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let make_service = make_service_fn(move |_| {
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// For each connection, clone the counter to use in our service...
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let cnt = counter.clone();
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async move {
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Ok::<_, Error>(service_fn(move |_| {
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let prev = cnt.get();
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cnt.set(prev + 1);
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let value = cnt.get();
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async move {
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Ok::<_, Error>(Response::new(Body::from(
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format!("Request #{}", value)
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)))
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}
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}))
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}
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});
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let server = Server::bind(&addr)
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.executor(LocalExec)
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.serve(make_service);
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println!("Listening on http://{}", addr);
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// The server would block on current thread to await !Send futures.
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if let Err(e) = server.await {
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eprintln!("server error: {}", e);
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}
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}
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// Since the Server needs to spawn some background tasks, we needed
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// to configure an Executor that can spawn !Send futures...
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#[derive(Clone, Copy, Debug)]
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struct LocalExec;
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impl<F> hyper::rt::Executor<F> for LocalExec
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where
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F: std::future::Future + 'static, // not requiring `Send`
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{
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fn execute(&self, fut: F) {
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// This will spawn into the currently running `LocalSet`.
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tokio::task::spawn_local(fut);
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}
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}
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