vvecna
/
troll-patrol


			
				
					
						
						
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							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<String>,
    req: Request<Body>,
) -> Result<Response<Body>, 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<Command>,
    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<Command>) {
    let mut extra_infos_pages = Vec::<String>::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<Body>,
        sender: oneshot::Sender<Result<Response<Body>, Infallible>>,
    },
    Shutdown {
        shutdown_sig: broadcast::Sender<()>,
    },
}

fn add_extra_infos(extra_infos_pages: &mut Vec<String>, request: Bytes) -> Response<Body> {
    let extra_infos: HashSet<ExtraInfo> = 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<String>) -> Response<Body> {
    let mut body_str = String::new();
    for i in 0..extra_infos_pages.len() {
        body_str
            .push_str(format!("<a href=\"{}-extra-infos\">{}-extra-infos</a>\n", i, i).as_str());
    }
    prepare_header(body_str)
}

fn serve_extra_infos_file(extra_infos_pages: &Vec<String>, path: &str) -> Response<Body> {
    if path.ends_with("-extra-infos") {
        if let Ok(index) = &path[1..(path.len() - "-extra-infos".len())].parse::<usize>() {
            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<Body> {
    let mut resp = Response::new(Body::from(response));
    resp.headers_mut()
        .insert("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
    resp
}