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full.rs
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full.rs
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use anyhow::Context;
use anyhow::Result;
use http::HttpServer;
use tracing::error;
use tracing::info;
use tracing::info_span;
use tracing::Instrument;
use webtransport::WebTransportServer;
use wtransport::tls::Sha256Digest;
use wtransport::tls::Sha256DigestFmt;
use wtransport::Identity;
#[tokio::main]
async fn main() -> Result<()> {
utils::init_logging();
let identity = Identity::self_signed(["localhost", "127.0.0.1", "::1"]).unwrap();
let cert_digest = identity.certificate_chain().as_slice()[0].hash();
let webtransport_server = WebTransportServer::new(&identity)?;
let http_server = HttpServer::new(&cert_digest, webtransport_server.local_port()).await?;
info!(
"Open Google Chrome and go to: http://127.0.0.1:{}",
http_server.local_port()
);
tokio::select! {
result = http_server.serve() => {
error!("HTTP server: {:?}", result);
}
result = webtransport_server.serve() => {
error!("WebTransport server: {:?}", result);
}
}
Ok(())
}
mod webtransport {
use super::*;
use std::time::Duration;
use wtransport::endpoint::endpoint_side::Server;
use wtransport::endpoint::IncomingSession;
use wtransport::Endpoint;
use wtransport::ServerConfig;
pub struct WebTransportServer {
endpoint: Endpoint<Server>,
}
impl WebTransportServer {
pub fn new(identity: &Identity) -> Result<Self> {
let config = ServerConfig::builder()
.with_bind_default(0)
.with_identity(identity)
.keep_alive_interval(Some(Duration::from_secs(3)))
.build();
let endpoint = Endpoint::server(config)?;
Ok(Self { endpoint })
}
pub fn local_port(&self) -> u16 {
self.endpoint.local_addr().unwrap().port()
}
pub async fn serve(self) -> Result<()> {
info!("Server running on port {}", self.local_port());
for id in 0.. {
let incoming_session = self.endpoint.accept().await;
tokio::spawn(
Self::handle_incoming_session(incoming_session)
.instrument(info_span!("Connection", id)),
);
}
Ok(())
}
async fn handle_incoming_session(incoming_session: IncomingSession) {
async fn handle_incoming_session_impl(incoming_session: IncomingSession) -> Result<()> {
let mut buffer = vec![0; 65536].into_boxed_slice();
info!("Waiting for session request...");
let session_request = incoming_session.await?;
info!(
"New session: Authority: '{}', Path: '{}'",
session_request.authority(),
session_request.path()
);
let connection = session_request.accept().await?;
info!("Waiting for data from client...");
loop {
tokio::select! {
stream = connection.accept_bi() => {
let mut stream = stream?;
info!("Accepted BI stream");
let bytes_read = match stream.1.read(&mut buffer).await? {
Some(bytes_read) => bytes_read,
None => continue,
};
let str_data = std::str::from_utf8(&buffer[..bytes_read])?;
info!("Received (bi) '{str_data}' from client");
stream.0.write_all(b"ACK").await?;
}
stream = connection.accept_uni() => {
let mut stream = stream?;
info!("Accepted UNI stream");
let bytes_read = match stream.read(&mut buffer).await? {
Some(bytes_read) => bytes_read,
None => continue,
};
let str_data = std::str::from_utf8(&buffer[..bytes_read])?;
info!("Received (uni) '{str_data}' from client");
let mut stream = connection.open_uni().await?.await?;
stream.write_all(b"ACK").await?;
}
dgram = connection.receive_datagram() => {
let dgram = dgram?;
let str_data = std::str::from_utf8(&dgram)?;
info!("Received (dgram) '{str_data}' from client");
connection.send_datagram(b"ACK")?;
}
}
}
}
let result = handle_incoming_session_impl(incoming_session).await;
info!("Result: {:?}", result);
}
}
}
mod http {
use super::*;
use axum::http::header::CONTENT_TYPE;
use axum::response::Html;
use axum::routing::get;
use axum::serve;
use axum::serve::Serve;
use axum::Router;
use std::net::Ipv4Addr;
use std::net::SocketAddr;
use tokio::net::TcpListener;
pub struct HttpServer {
serve: Serve<Router, Router>,
local_port: u16,
}
impl HttpServer {
const PORT: u16 = 8080;
pub async fn new(cert_digest: &Sha256Digest, webtransport_port: u16) -> Result<Self> {
let router = Self::build_router(cert_digest, webtransport_port);
let listener =
TcpListener::bind(SocketAddr::new(Ipv4Addr::LOCALHOST.into(), Self::PORT))
.await
.context("Cannot bind TCP listener for HTTP server")?;
let local_port = listener
.local_addr()
.context("Cannot get local port")?
.port();
Ok(HttpServer {
serve: serve(listener, router),
local_port,
})
}
pub fn local_port(&self) -> u16 {
self.local_port
}
pub async fn serve(self) -> Result<()> {
info!("Server running on port {}", self.local_port());
self.serve.await.context("HTTP server error")?;
Ok(())
}
fn build_router(cert_digest: &Sha256Digest, webtransport_port: u16) -> Router {
let cert_digest = cert_digest.fmt(Sha256DigestFmt::BytesArray);
let root = move || async move {
Html(
http_data::INDEX_DATA
.replace("${WEBTRANSPORT_PORT}", &webtransport_port.to_string()),
)
};
let style =
move || async move { ([(CONTENT_TYPE, "text/css")], http_data::STYLE_DATA) };
let client = move || async move {
(
[(CONTENT_TYPE, "application/javascript")],
http_data::CLIENT_DATA.replace("${CERT_DIGEST}", &cert_digest),
)
};
Router::new()
.route("/", get(root))
.route("/style.css", get(style))
.route("/client.js", get(client))
}
}
}
mod utils {
use tracing_subscriber::filter::LevelFilter;
use tracing_subscriber::EnvFilter;
pub fn init_logging() {
let env_filter = EnvFilter::builder()
.with_default_directive(LevelFilter::INFO.into())
.from_env_lossy();
tracing_subscriber::fmt()
.with_target(true)
.with_level(true)
.with_env_filter(env_filter)
.init();
}
}
mod http_data {
pub const INDEX_DATA: &str = r#"
<!doctype html>
<html lang="en">
<title>WTransport-Example</title>
<meta charset="utf-8">
<script src="client.js"></script>
<link rel="stylesheet" href="style.css">
<meta name="viewport" content="width=device-width, initial-scale=1">
<body>
<h1>WTransport Example</h1>
<div>
<h2>Establish WebTransport connection</h2>
<div class="input-line">
<label for="url">URL:</label>
<input type="text" name="url" id="url" value="https://localhost:${WEBTRANSPORT_PORT}/">
<input type="button" id="connect" value="Connect" onclick="connect()">
</div>
</div>
<div>
<h2>Send data over WebTransport</h2>
<form name="sending">
<textarea name="data" id="data"></textarea>
<div>
<input type="radio" name="sendtype" value="datagram" id="datagram" checked>
<label for="datagram">Send a datagram</label>
</div>
<div>
<input type="radio" name="sendtype" value="unidi" id="unidi-stream">
<label for="unidi-stream">Open a unidirectional stream</label>
</div>
<div>
<input type="radio" name="sendtype" value="bidi" id="bidi-stream">
<label for="bidi-stream">Open a bidirectional stream</label>
</div>
<input type="button" id="send" name="send" value="Send data" disabled onclick="sendData()">
</form>
</div>
<div>
<h2>Event log</h2>
<ul id="event-log">
</ul>
</div>
</body>
</html>
"#;
pub const STYLE_DATA: &str = r#"
body {
font-family: sans-serif;
}
h1 {
margin: 0 auto;
width: fit-content;
}
h2 {
border-bottom: 1px dotted #333;
font-size: 120%;
font-weight: normal;
padding-bottom: 0.2em;
padding-top: 0.5em;
}
code {
background-color: #eee;
}
input[type=text], textarea {
font-family: monospace;
}
#top {
display: flex;
flex-direction: row-reverse;
flex-wrap: wrap;
justify-content: center;
}
#explanation {
border: 1px dotted black;
font-size: 90%;
height: fit-content;
margin-bottom: 1em;
padding: 1em;
width: 13em;
}
#tool {
flex-grow: 1;
margin: 0 auto;
max-width: 26em;
padding: 0 1em;
width: 26em;
}
.input-line {
display: flex;
}
.input-line input[type=text] {
flex-grow: 1;
margin: 0 0.5em;
}
textarea {
height: 3em;
width: 100%;
}
#send {
margin-top: 0.5em;
width: 15em;
}
#event-log {
border: 1px dotted black;
font-family: monospace;
height: 12em;
overflow: scroll;
padding-bottom: 1em;
padding-top: 1em;
}
.log-error {
color: darkred;
}
#explanation ul {
padding-left: 1em;
}
"#;
pub const CLIENT_DATA: &str = r#"
// Adds an entry to the event log on the page, optionally applying a specified
// CSS class.
const HASH = new Uint8Array(${CERT_DIGEST});
let currentTransport, streamNumber, currentTransportDatagramWriter;
// "Connect" button handler.
async function connect() {
const url = document.getElementById('url').value;
try {
var transport = new WebTransport(url, { serverCertificateHashes: [ { algorithm: "sha-256", value: HASH.buffer } ] } );
addToEventLog('Initiating connection...');
} catch (e) {
addToEventLog('Failed to create connection object. ' + e, 'error');
return;
}
try {
await transport.ready;
addToEventLog('Connection ready.');
} catch (e) {
addToEventLog('Connection failed. ' + e, 'error');
return;
}
transport.closed
.then(() => {
addToEventLog('Connection closed normally.');
})
.catch(() => {
addToEventLog('Connection closed abruptly.', 'error');
});
currentTransport = transport;
streamNumber = 1;
try {
currentTransportDatagramWriter = transport.datagrams.writable.getWriter();
addToEventLog('Datagram writer ready.');
} catch (e) {
addToEventLog('Sending datagrams not supported: ' + e, 'error');
return;
}
readDatagrams(transport);
acceptUnidirectionalStreams(transport);
document.forms.sending.elements.send.disabled = false;
document.getElementById('connect').disabled = true;
}
// "Send data" button handler.
async function sendData() {
let form = document.forms.sending.elements;
let encoder = new TextEncoder('utf-8');
let rawData = sending.data.value;
let data = encoder.encode(rawData);
let transport = currentTransport;
try {
switch (form.sendtype.value) {
case 'datagram':
await currentTransportDatagramWriter.write(data);
addToEventLog('Sent datagram: ' + rawData);
break;
case 'unidi': {
let stream = await transport.createUnidirectionalStream();
let writer = stream.getWriter();
await writer.write(data);
await writer.close();
addToEventLog('Sent a unidirectional stream with data: ' + rawData);
break;
}
case 'bidi': {
let stream = await transport.createBidirectionalStream();
let number = streamNumber++;
readFromIncomingStream(stream, number);
let writer = stream.writable.getWriter();
await writer.write(data);
await writer.close();
addToEventLog(
'Opened bidirectional stream #' + number +
' with data: ' + rawData);
break;
}
}
} catch (e) {
addToEventLog('Error while sending data: ' + e, 'error');
}
}
// Reads datagrams from |transport| into the event log until EOF is reached.
async function readDatagrams(transport) {
try {
var reader = transport.datagrams.readable.getReader();
addToEventLog('Datagram reader ready.');
} catch (e) {
addToEventLog('Receiving datagrams not supported: ' + e, 'error');
return;
}
let decoder = new TextDecoder('utf-8');
try {
while (true) {
const { value, done } = await reader.read();
if (done) {
addToEventLog('Done reading datagrams!');
return;
}
let data = decoder.decode(value);
addToEventLog('Datagram received: ' + data);
}
} catch (e) {
addToEventLog('Error while reading datagrams: ' + e, 'error');
}
}
async function acceptUnidirectionalStreams(transport) {
let reader = transport.incomingUnidirectionalStreams.getReader();
try {
while (true) {
const { value, done } = await reader.read();
if (done) {
addToEventLog('Done accepting unidirectional streams!');
return;
}
let stream = value;
let number = streamNumber++;
addToEventLog('New incoming unidirectional stream #' + number);
readFromIncomingStream(stream, number);
}
} catch (e) {
addToEventLog('Error while accepting streams: ' + e, 'error');
}
}
async function readFromIncomingStream(stream, number) {
let decoder = new TextDecoderStream('utf-8');
let reader = stream.pipeThrough(decoder).getReader();
try {
while (true) {
const { value, done } = await reader.read();
if (done) {
addToEventLog('Stream #' + number + ' closed');
return;
}
let data = value;
addToEventLog('Received data on stream #' + number + ': ' + data);
}
} catch (e) {
addToEventLog(
'Error while reading from stream #' + number + ': ' + e, 'error');
addToEventLog(' ' + e.message);
}
}
function addToEventLog(text, severity = 'info') {
let log = document.getElementById('event-log');
let mostRecentEntry = log.lastElementChild;
let entry = document.createElement('li');
entry.innerText = text;
entry.className = 'log-' + severity;
log.appendChild(entry);
// If the most recent entry in the log was visible, scroll the log to the
// newly added element.
if (mostRecentEntry != null &&
mostRecentEntry.getBoundingClientRect().top <
log.getBoundingClientRect().bottom) {
entry.scrollIntoView();
}
}
"#;
}