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https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +bytes = "1" +http = "0.2" +hyper = "0.14" +mpart-async = "0.5" +futures = "0.3" +tokio = { version = "1", features = ["macros", "rt"] } +reqwest = { version = "0.11", features = ["stream"] } +warp = "0.3" diff --git a/src/app.rs b/src/app.rs new file mode 100644 index 0000000..50bb4a9 --- /dev/null +++ b/src/app.rs @@ -0,0 +1,79 @@ +use std::sync::{Arc, RwLock}; +use http::header::HeaderMap; +use tokio::sync::broadcast::{self, Sender, Receiver}; +use mpart_async::server::ParseOutput; + +pub type Payload = Arc; + +#[derive(Clone)] +pub struct App { + state: Arc>>, +} + +impl App { + pub fn new() -> App { + App { + state: Arc::new(RwLock::new(None)), + } + } + + pub fn source(&self, headers: HeaderMap, boundary: Vec) -> AppSource { + { + let mut state = self.state.write().unwrap(); + *state = Some(State { + headers: Arc::new(headers), + boundary, + next_broadcast: broadcast::channel(128), + }); + } + + AppSource { + app: self.clone(), + } + } + + pub fn subscribe(&self) -> Option> { + let state = self.state.read().unwrap(); + state.as_ref().map(|state| { + let tx = &state.next_broadcast.0; + tx.subscribe() + }) + } + + pub fn boundary(&self) -> Vec { + let state = self.state.read().unwrap(); + state.as_ref().unwrap().boundary.clone() + } + + pub fn headers(&self) -> Option> { + let state = self.state.read().unwrap(); + state.as_ref().map(|state| { + state.headers.clone() + }) + } +} + +pub struct AppSource { + app: App, +} + +impl Drop for AppSource { + fn drop(&mut self) { + let mut state = self.app.state.write().unwrap(); + *state = None; + } +} + +impl AppSource { + pub fn begin_part(&mut self) -> Sender { + let mut state = self.app.state.write().unwrap(); + let (tx, _rx) = std::mem::replace(&mut state.as_mut().unwrap().next_broadcast, broadcast::channel(128)); + tx + } +} + +struct State { + headers: Arc, + boundary: Vec, + next_broadcast: (Sender, Receiver), +} diff --git a/src/client.rs b/src/client.rs new file mode 100644 index 0000000..880684a --- /dev/null +++ b/src/client.rs @@ -0,0 +1,68 @@ +use std::sync::Arc; +use futures::stream::TryStreamExt; +use mpart_async::server::{ + MultipartParser, + ParseOutput::{Headers, Bytes}, +}; +use reqwest::StatusCode; +use crate::app::App; + +#[derive(Debug, Clone)] +pub enum Error { + InvalidStatus(StatusCode), + InvalidMultipart, +} + +impl std::error::Error for Error {} + +impl std::fmt::Display for Error { + fn fmt(&self, fmt: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> { + write!(fmt, "Invalid multipart") + } +} + +async fn run_once(app: &App) -> Result<(), Box> { + // let res = reqwest::get("http://172.20.78.164:81/stream") + let res = reqwest::get("http://localhost:8080/?action=stream") + .await?; + if res.status() != StatusCode::OK { + Err(Error::InvalidStatus(res.status()))?; + } + + let content_type = res.headers().get("content-type") + .ok_or(Error::InvalidMultipart)?; + let mut boundary = None; + for field in content_type.as_ref().split(|b| *b == ';' as u8) { + if field.starts_with(b"boundary=") { + boundary = Some(field[9..].to_owned()); + } + } + let boundary = boundary.ok_or(Error::InvalidMultipart)?; + let headers = res.headers().clone(); + let mut stream = MultipartParser::new( + boundary.clone(), + res.bytes_stream() + .map_ok(|buf| buf), + ); + let mut source = app.source(headers, boundary); + let mut tx = source.begin_part(); + while let Ok(Some(part)) = stream.try_next().await { + match &part { + Headers(_headers) => + tx = source.begin_part(), + Bytes(_bytes) => {} + } + let _ = tx.send(Arc::new(part)); + } + + Ok(()) +} + +pub async fn run(app: App) { + loop { + run_once(&app).await + .unwrap_or_else(|e| println!("Client: {:?}", e)); + + // TODO: delay with backoff + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..4158c82 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,16 @@ +use futures::prelude::future::FutureExt; + +mod app; +mod client; +mod server; + +#[tokio::main(flavor = "current_thread")] +async fn main() { + let app = app::App::new(); + let c = tokio::spawn(client::run(app.clone())); + let s = tokio::spawn(server::run(app)); + futures::select! { + _ = c.fuse() => panic!("client exit"), + _ = s.fuse() => panic!("server exit"), + }; +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..dbad476 --- /dev/null +++ b/src/server.rs @@ -0,0 +1,162 @@ +use std::{convert::Infallible}; +use bytes::{BufMut, Bytes, BytesMut}; +use futures::stream; +use tokio::sync::broadcast::{Receiver}; +use http::{ + header::HeaderMap, + status::StatusCode, +}; +use hyper::Body; +use mpart_async::server::ParseOutput; +use warp::{ + Filter, + reply::{Reply, Response}, +}; +use crate::app::{App, Payload}; + +struct PartStream { + app: App, +} + +impl PartStream { + async fn new(app: App) -> Result { + Ok(PartStream { app }) + } +} + +impl Reply for PartStream { + fn into_response(self) -> Response { + let (rx, headers) = match (self.app.subscribe(), self.app.headers()) { + (Some(rx), Some(headers)) => (rx, headers), + _ => { + let mut res = Response::new(Body::empty()); + *res.status_mut() = StatusCode::BAD_GATEWAY; + return res; + } + }; + + let body_stream = stream::unfold((self, rx), |(this, mut rx)| async move { + let result = match rx.recv().await { + Ok(payload) => { + let bytes = match payload.as_ref() { + ParseOutput::Headers(headers) => { + let mut buf = BytesMut::new(); + buf.put_slice(b"--"); + buf.put_slice(&this.app.boundary()); + buf.put_slice(b"\r\n"); + for (name, value) in headers { + buf.put_slice(name.as_ref()); + buf.put_slice(b": "); + buf.put_slice(value.as_ref()); + buf.put_slice(b"\r\n"); + } + buf.put_slice(b"\r\n"); + buf.freeze() + } + ParseOutput::Bytes(bytes) => { + bytes.clone() + } + }; + Some(Ok(bytes)) + } + Err(e) => { + match this.app.subscribe() { + Some(next_rx) => { + rx = next_rx; + Some(Ok(Bytes::from(""))) + } + None => + Some(Err(e)), + } + } + }; + result.map(|result| (result, (this, rx))) + }); + let mut res = Response::new(Body::wrap_stream(body_stream)); + for (name, value) in headers.as_ref() { + res.headers_mut() + .insert(name, value.clone()); + } + res + } +} + +struct PartCapture { + rx: Option>, + headers: Option, +} + +impl PartCapture { + // async fn start(app: App) -> PartCapture { + async fn start(app: App) -> Result { + let mut rx = app.subscribe(); + let headers = match (&mut rx, app.headers()) { + (Some(ref mut rx), Some(ref stream_headers)) => { + match rx.recv().await { + Ok(output) => match output.as_ref() { + ParseOutput::Headers(part_headers) => { + let mut headers = stream_headers.as_ref().clone(); + for (name, value) in part_headers { + headers.insert(name, value.clone()); + } + Some(headers) + } + _ => None, + } + _ => None, + } + } + _ => None, + }; + Ok(PartCapture { rx, headers }) + } +} + +impl Reply for PartCapture { + fn into_response(self) -> Response { + let (rx, headers) = match (self.rx, self.headers) { + (Some(rx), Some(headers)) => (rx, headers), + _ => { + let mut res = Response::new(Body::empty()); + *res.status_mut() = StatusCode::BAD_GATEWAY; + return res; + } + }; + + let body_stream = stream::unfold(rx, |mut rx| async move { + match rx.recv().await { + Ok(payload) => { + match payload.as_ref() { + ParseOutput::Headers(_headers) => { + None + } + ParseOutput::Bytes(bytes) => { + Some((Ok(bytes.clone()), rx)) + } + } + } + Err(e) => { + println!("e: {:?}", e); + Some((Err(e), rx)) + }, + } + }); + + let mut res = Response::new(Body::wrap_stream(body_stream)); + *res.headers_mut() = headers; + res + } +} + +pub async fn run(app: App) { + let app_ = app.clone(); + let stream = warp::path!("stream.mjpeg") + .and_then(move || PartStream::new(app_.clone())); + let capture = warp::path!("capture.jpg") + .map(move || app.clone()) + .and_then(PartCapture::start); + let routes = warp::get() + .and(stream) + .or(capture); + warp::serve(routes).run(([127, 0, 0, 1], 3030)).await; +}