use crate::extra_info::ExtraInfo; use hyper::{ body::{self, Bytes}, header::HeaderValue, server::conn::AddrStream, service::{make_service_fn, service_fn}, Body, Method, Request, Response, Server, }; use serde_json::json; use std::{collections::HashSet, convert::Infallible, net::SocketAddr, time::Duration}; use tokio::{ spawn, sync::{broadcast, mpsc, oneshot}, time::sleep, }; async fn serve_extra_infos( extra_infos_pages: &mut Vec, req: Request, ) -> Result, Infallible> { match req.method() { &Method::OPTIONS => Ok(Response::builder() .header("Access-Control-Allow-Origin", HeaderValue::from_static("*")) .header("Access-Control-Allow-Headers", "accept, content-type") .header("Access-Control-Allow-Methods", "POST") .status(200) .body(Body::from("Allow POST")) .unwrap()), _ => match req.uri().path() { "/" => Ok::<_, Infallible>(serve_index(&extra_infos_pages)), "/add" => Ok::<_, Infallible>({ let bytes = body::to_bytes(req.into_body()).await.unwrap(); add_extra_infos(extra_infos_pages, bytes) }), path => Ok::<_, Infallible>({ // Serve the requested file serve_extra_infos_file(&extra_infos_pages, path) }), }, } } pub async fn server() { let (context_tx, context_rx) = mpsc::channel(32); let request_tx = context_tx.clone(); let shutdown_cmd_tx = context_tx.clone(); let (shutdown_tx, mut shutdown_rx) = broadcast::channel(16); let kill_context = shutdown_tx.subscribe(); let context_manager = spawn(async move { create_context_manager(context_rx, kill_context).await }); let addr = SocketAddr::from(([127, 0, 0, 1], 8004)); let make_svc = make_service_fn(move |_conn: &AddrStream| { let request_tx = request_tx.clone(); let service = service_fn(move |req| { let request_tx = request_tx.clone(); let (response_tx, response_rx) = oneshot::channel(); let cmd = Command::Request { req, sender: response_tx, }; async move { request_tx.send(cmd).await.unwrap(); response_rx.await.unwrap() } }); async move { Ok::<_, Infallible>(service) } }); let server = Server::bind(&addr).serve(make_svc); println!("Listening on localhost:8004"); if let Err(e) = server.await { eprintln!("server error: {}", e); } } async fn create_context_manager( context_rx: mpsc::Receiver, mut kill: broadcast::Receiver<()>, ) { tokio::select! { create_context = context_manager(context_rx) => create_context, _ = kill.recv() => {println!("Shut down context_manager");}, } } async fn context_manager(mut context_rx: mpsc::Receiver) { let mut extra_infos_pages = Vec::::new(); while let Some(cmd) = context_rx.recv().await { use Command::*; match cmd { Request { req, sender } => { let response = serve_extra_infos(&mut extra_infos_pages, req).await; if let Err(e) = sender.send(response) { eprintln!("Server Response Error: {:?}", e); } sleep(Duration::from_millis(1)).await; } Shutdown { shutdown_sig } => { drop(shutdown_sig); } } } } #[derive(Debug)] enum Command { Request { req: Request, sender: oneshot::Sender, Infallible>>, }, Shutdown { shutdown_sig: broadcast::Sender<()>, }, } fn add_extra_infos(extra_infos_pages: &mut Vec, request: Bytes) -> Response { let extra_infos: HashSet = match serde_json::from_slice(&request) { Ok(req) => req, Err(e) => { let response = json!({"error": e.to_string()}); let val = serde_json::to_string(&response).unwrap(); return prepare_header(val); } }; let mut extra_infos_file = String::new(); for extra_info in extra_infos { extra_infos_file.push_str(extra_info.to_string().as_str()); } extra_infos_pages.push(extra_infos_file); prepare_header("OK".to_string()) } fn serve_index(extra_infos_pages: &Vec) -> Response { let mut body_str = String::new(); for i in 0..extra_infos_pages.len() { body_str .push_str(format!("{}-extra-infos\n", i, i).as_str()); } prepare_header(body_str) } fn serve_extra_infos_file(extra_infos_pages: &Vec, path: &str) -> Response { if path.ends_with("-extra-infos") { if let Ok(index) = &path[1..(path.len() - "-extra-infos".len())].parse::() { if extra_infos_pages.len() > *index { return prepare_header(extra_infos_pages[*index].clone()); } } } prepare_header("Not a valid file".to_string()) } // Prepare HTTP Response for successful Server Request fn prepare_header(response: String) -> Response { let mut resp = Response::new(Body::from(response)); resp.headers_mut() .insert("Access-Control-Allow-Origin", HeaderValue::from_static("*")); resp }