#![deny(clippy::pedantic)]
#![allow(clippy::used_underscore_binding)]
use arc_swap::ArcSwap;
use bus_queue::flavors::arc_swap::{bounded, Publisher, Subscriber};
use bytes::Bytes;
use derive_more::Deref;
use futures::{SinkExt, StreamExt};
use serde::Serialize;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio::net::TcpStream;
use tokio::sync::Mutex;
use std::convert::TryFrom;
use std::net::SocketAddr;
use std::sync::{
atomic::{AtomicU64, Ordering},
Arc,
};
#[derive(Debug, Deref)]
struct Request(http::Request<()>);
impl From<httparse::Request<'_, '_>> for Request {
fn from(parsed: httparse::Request<'_, '_>) -> Self {
let mut req = http::Request::builder()
.version(http::Version::HTTP_11)
.method(parsed.method.unwrap())
.uri(parsed.path.unwrap());
for header in parsed.headers {
req.headers_mut().unwrap().insert(
http::header::HeaderName::from_bytes(header.name.as_bytes()).unwrap(),
http::HeaderValue::try_from(header.value).unwrap(),
);
}
Self(req.body(()).unwrap())
}
}
#[derive(Debug, Default)]
struct MetadataContainer {
stream: ArcSwap<Option<StreamMetadata>>,
track: ArcSwap<Option<TrackMetadata>>,
listeners: AtomicU64,
}
impl serde::ser::Serialize for MetadataContainer {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
use serde::ser::SerializeStruct;
let mut struc = serializer.serialize_struct("", 2)?;
struc.serialize_field("stream", &**self.stream.load())?;
struc.serialize_field("track", &**self.track.load())?;
struc.serialize_field("listeners", &self.listeners)?;
struc.end()
}
}
#[derive(Debug, Default, Serialize)]
struct StreamMetadata {
user_agent: String,
content_type: String,
name: String,
}
impl From<&http::HeaderMap> for StreamMetadata {
fn from(map: &http::HeaderMap) -> Self {
let string_from_header = |v: Option<&http::HeaderValue>| {
v.map(http::HeaderValue::as_bytes)
.map(String::from_utf8_lossy)
.unwrap_or_default()
.into_owned()
};
Self {
user_agent: string_from_header(map.get("user-agent")),
content_type: string_from_header(map.get("content-type")),
name: string_from_header(map.get("ice-name")),
}
}
}
#[derive(Debug, Default, Serialize)]
struct TrackMetadata {
artist: Option<String>,
title: Option<String>,
album: Option<String>,
}
impl From<url::form_urlencoded::Parse<'_>> for TrackMetadata {
fn from(query: url::form_urlencoded::Parse<'_>) -> Self {
let mut meta = Self::default();
for (key, value) in query {
match key.as_ref() {
"artist" => meta.artist = Some(value.into_owned()),
"title" => meta.title = Some(value.into_owned()),
"album" => meta.album = Some(value.into_owned()),
_ => {}
}
}
meta
}
}
async fn write_response<W: tokio::io::AsyncWrite + Unpin>(mut writer: W, resp: http::Response<()>) {
writer
.write_all(
format!(
"{:?} {} {}\r\n",
resp.version(),
resp.status().as_str(),
resp.status().canonical_reason().unwrap()
)
.as_bytes(),
)
.await
.unwrap();
for (name, value) in resp.headers() {
writer.write_all(name.as_str().as_bytes()).await.unwrap();
writer.write_all(b": ").await.unwrap();
writer.write_all(value.as_bytes()).await.unwrap();
writer.write_all(b"\r\n").await.unwrap();
}
writer.write_all(b"\r\n").await.unwrap();
writer.flush().await.unwrap();
}
async fn process(
mut stream: TcpStream,
publisher: Arc<Mutex<Publisher<Bytes>>>,
mut subscriber: Subscriber<Bytes>,
metadata: Arc<MetadataContainer>,
) {
println!("accepted");
let mut buffer = bytes::BytesMut::with_capacity(1024);
if stream.read_buf(&mut buffer).await.unwrap() == 0 {
return;
}
let req = {
let mut headers = [httparse::EMPTY_HEADER; 16];
let mut parsed = httparse::Request::new(&mut headers);
let header_buffer = buffer.split().freeze();
parsed.parse(&header_buffer[..]).unwrap();
Request::from(parsed)
};
let resp = http::Response::builder()
.version(http::Version::HTTP_11)
.header(
"Server",
concat!(clap::crate_name!(), "/", clap::crate_version!()),
)
.header("Accept-Encoding", "identity")
.header("Connection", "keep-alive")
.header("Access-Control-Allow-Origin", "*");
match req.uri().path() {
"/listen.mp3" => {
let resp = resp.header("Content-Type", "audio/mpeg").body(()).unwrap();
write_response(&mut stream, resp).await;
metadata.listeners.fetch_add(1, Ordering::Relaxed);
loop {
if let Some(v) = subscriber.next().await {
if stream.write_all(v.as_ref()).await.is_err() {
break;
}
}
}
metadata.listeners.fetch_sub(1, Ordering::Relaxed);
}
"/stream" => {
println!("stream req: {:?}", req.headers());
if let Ok(ref mut publisher) = publisher.try_lock() {
metadata
.stream
.store(Arc::new(Some(StreamMetadata::from(req.headers()))));
let mut resp = resp
.header("Connection", "Close")
.header("Allow", "PUT, SOURCE");
let expect_header = req
.headers()
.get("expect")
.map(http::HeaderValue::as_bytes)
.unwrap_or_default();
if expect_header == b"100-continue" {
resp = resp.status(100);
}
write_response(&mut stream, resp.body(()).unwrap()).await;
loop {
if stream.read_buf(&mut buffer).await.unwrap() == 0 {
break;
}
publisher.send(buffer.split().freeze()).await.unwrap();
}
metadata.stream.store(Arc::new(None));
metadata.track.store(Arc::new(None));
} else {
panic!("someone's already streaming!");
}
}
"/metadata" => {
let resp = resp
.header("Connection", "Close")
.header("Content-Type", "application/json")
.body(())
.unwrap();
write_response(&mut stream, resp).await;
stream
.write_all(serde_json::to_string(&*metadata).unwrap().as_bytes())
.await
.unwrap();
}
"/admin/metadata" => {
let query = url::form_urlencoded::parse(req.uri().query().unwrap().as_bytes());
metadata
.track
.store(Arc::new(Some(TrackMetadata::from(query))));
let resp = resp.body(()).unwrap();
write_response(&mut stream, resp).await;
}
_ => panic!("Invalid request: {:?}", req),
}
}
#[tokio::main]
async fn main() {
env_logger::init();
listen_forward(3000).await;
}
async fn listen_forward(port: u16) {
let (publisher, subscriber) = bounded::<bytes::Bytes>(128);
let publisher = Arc::new(Mutex::new(publisher));
let metadata = Arc::new(MetadataContainer::default());
let addr = SocketAddr::from(([127, 0, 0, 1], port));
let mut listener = tokio::net::TcpListener::bind(addr).await.unwrap();
loop {
println!("listening for new conns...");
let (stream, _) = listener.accept().await.unwrap();
let publisher = publisher.clone();
let subscriber = subscriber.clone();
let metadata = metadata.clone();
tokio::spawn(process(stream, publisher, subscriber, metadata));
}
}