/
tower-h2-server.rs
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/
tower-h2-server.rs
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#![deny(rust_2018_idioms)]
use bytes::{Bytes, IntoBuf};
use futures::*;
use http::Request;
use tokio::executor::DefaultExecutor;
use tokio::net::TcpListener;
use tower_h2::{Body, RecvBody, Server};
use tower_service::Service;
use tracing_futures::Instrument;
use tracing_tower::InstrumentMake;
type Response = http::Response<RspBody>;
struct RspBody(Option<Bytes>);
impl RspBody {
fn new(body: Bytes) -> Self {
RspBody(Some(body))
}
fn empty() -> Self {
RspBody(None)
}
}
impl Body for RspBody {
type Data = <Bytes as IntoBuf>::Buf;
type Error = h2::Error;
fn poll_data(&mut self) -> Poll<Option<Self::Data>, Self::Error> {
let data = self.0.take().and_then(|b| {
if b.is_empty() {
None
} else {
Some(b.into_buf())
}
});
Ok(Async::Ready(data))
}
fn poll_trailers(&mut self) -> Poll<Option<http::HeaderMap>, Self::Error> {
Ok(None.into())
}
}
const ROOT: &'static str = "/";
#[derive(Debug)]
struct Svc;
impl Service<Request<RecvBody>> for Svc {
type Response = Response;
type Error = h2::Error;
type Future = future::FutureResult<Response, Self::Error>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
fn call(&mut self, req: Request<RecvBody>) -> Self::Future {
tracing::trace!(message = "received request", request.headers = ?req.headers());
let mut rsp = http::Response::builder();
rsp.version(http::Version::HTTP_2);
let uri = req.uri();
let rsp = if uri.path() != ROOT {
let body = RspBody::empty();
tracing::warn!(rsp.error = %"unrecognized path", request.path = ?uri.path());
rsp.status(404).body(body).unwrap()
} else {
let body = RspBody::new("heyo!".into());
rsp.status(200).body(body).unwrap()
};
tracing::debug!(rsp.status = %rsp.status(), message = "sending response...");
future::ok(rsp)
}
}
#[derive(Debug)]
struct NewSvc;
impl tower_service::Service<()> for NewSvc {
type Response = Svc;
type Error = ::std::io::Error;
type Future = future::FutureResult<Svc, Self::Error>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
fn call(&mut self, _target: ()) -> Self::Future {
future::ok(Svc)
}
}
fn main() {
// Set the default subscriber to record all traces emitted by this example
// and by the `tracing_tower` library's helpers.
use tracing_subscriber::filter::EnvFilter;
let filter = EnvFilter::from_default_env()
.add_directive("tower_h2_server=trace".parse().unwrap())
.add_directive("tracing_tower=trace".parse().unwrap());
let subscriber = tracing_subscriber::FmtSubscriber::builder()
.with_env_filter(filter)
.finish();
let _ = tracing::subscriber::set_global_default(subscriber);
let addr = "[::1]:8888".parse().unwrap();
let bind = TcpListener::bind(&addr).expect("bind");
// Construct a span for the server task, annotated with the listening IP
// address and port.
let span = tracing::trace_span!("server", ip = %addr.ip(), port = addr.port());
let server = lazy(|| {
let executor = DefaultExecutor::current();
// Enrich the `MakeService` with a wrapper so that each request is
// traced with its own span.
let new_svc = NewSvc.with_traced_requests(tracing_tower::http::debug_request);
let h2 = Server::new(new_svc, Default::default(), executor);
tracing::info!("listening");
bind.incoming()
.fold(h2, |mut h2, sock| {
// Construct a new span for each accepted connection.
let addr = sock.peer_addr().expect("can't get addr");
let span = tracing::trace_span!("conn", ip = %addr.ip(), port = addr.port());
let _enter = span.enter();
tracing::debug!("accepted connection");
if let Err(e) = sock.set_nodelay(true) {
return Err(e);
}
let serve = h2
.serve(sock)
.map_err(|error| tracing::error!(message = "h2 error", %error))
.map(|_| {
tracing::trace!("finished serving connection");
})
.instrument(span.clone());
tokio::spawn(serve);
Ok(h2)
})
.map_err(|error| tracing::error!(message = "serve error", %error))
.map(|_| {})
})
.instrument(span);
tokio::run(server);
}