wsrouter 0.1.0

use crate::routes::{Dispatcher, Params, Route};
use crate::parser::Parsed;
use futures_util::{SinkExt, StreamExt};
use std::sync::Arc;
use tokio::net::TcpListener;
use tokio_tungstenite::accept_async;
use tokio_tungstenite::tungstenite::Message;

pub struct Server {
    url: String,
    routes: Vec<Route>,
}

impl Server {
    pub fn new(url: String) -> Self {
        Self {
            url,
            routes: Vec::new(),
        }
    }

    pub fn route<F>(&mut self, name: String, callback: F)
    where
        F: Fn(&Params, &Dispatcher) + Send + Sync + 'static,
    {
        self.routes.push(Route {
            name,
            callback: Box::new(callback),
        });
    }

    pub async fn serve(self) {
        let listener = TcpListener::bind(&self.url).await.unwrap();
        let routes = Arc::new(self.routes);
        while let Ok((stream, _)) = listener.accept().await {
            let routes = Arc::clone(&routes);

            tokio::spawn(async move {
                let ws = match accept_async(stream).await {
                    Ok(ws) => ws,
                    Err(_) => return,
                };
                let (mut write, mut read) = ws.split();

                let (sender, mut receiver) = tokio::sync::mpsc::unbounded_channel::<String>();
                let dispatcher = Dispatcher {
                    sender: sender.clone(),
                };

                loop {
                    tokio::select! {
                        // outgoing
                        Some(msg) = receiver.recv() => {
                            let _ = write.send(Message::text(msg)).await;
                        }

                        // incoming
                        Some(Ok(msg)) = read.next() => {
                            let parsed = Parsed::parse(msg.to_string());

                            if let Some(route) =
                                routes.iter().find(|r| r.name == parsed.command)
                            {
                                (route.callback)(&parsed.params, &dispatcher);
                            }
                        }

                        else => break,
                    }
                }
            });
        }
    }
}