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// Copyleft (ɔ) 2021-2021 The Whirlsplash Collective
// SPDX-License-Identifier: GPL-3.0-only
//! Exposes the Distributor and Hub for further use.
#![feature(
type_ascription,
hash_set_entry,
type_name_of_val,
decl_macro,
proc_macro_hygiene
)]
#![deny(
warnings,
nonstandard_style,
unused,
future_incompatible,
rust_2018_idioms,
unsafe_code
)]
#![deny(clippy::all, clippy::nursery, clippy::pedantic)] // clippy::pedantic
#![recursion_limit = "128"]
#[macro_use]
extern crate log;
#[macro_use]
extern crate async_trait;
mod cmd;
mod interaction;
mod net;
pub mod distributor;
pub mod hub;
mod packet_parser;
use std::{error::Error, fmt, net::SocketAddr, sync::Arc};
use tokio::{
net::{TcpListener, TcpStream},
sync::Mutex,
};
use whirl_config::Config;
use crate::interaction::shared::Shared;
/// The type of server the `listen` method of the `Server` trait will
/// implemented for.
#[derive(Debug)]
pub enum ServerType {
AnonRoom,
AnonUser,
Auto,
Room,
User,
}
// https://stackoverflow.com/a/32712140/14452787
impl fmt::Display for ServerType {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "{:?}", self) }
}
#[async_trait]
pub trait Server {
async fn listen(address: &str, server_type: ServerType) -> Result<(), Box<dyn Error>> {
let listener = TcpListener::bind(address).await?;
let state = Arc::new(Mutex::new(Shared::new()));
let mut counter = 0;
info!(
"server of type {} now listening at {}",
server_type.to_string(),
address
);
loop {
let (stream, address) = listener.accept().await?;
counter += 1;
let state = Arc::clone(&state);
debug!("accepted client at {}", address);
tokio::spawn(async move {
if let Err(e) = Self::handle(state, stream, address, counter).await {
error!("an error occurred: {}", e);
}
if std::env::var("EXIT_ON_CLIENT_DISCONNECT").unwrap_or_else(|_| "false".to_string())
== "true"
{
std::process::exit(0);
}
});
}
}
async fn handle(
state: Arc<Mutex<Shared>>,
stream: TcpStream,
_address: SocketAddr,
count: usize,
) -> Result<(), Box<dyn Error>>;
}
/// Spawn and return a vector of thread handles for each sub-server -- which
/// should be -- instantiated by the `whirl_server` crate.
///
/// # Panics
/// - A panic may occur if the TCP server is unable to bind the specified port.
#[must_use]
pub fn make() -> Vec<tokio::task::JoinHandle<()>> {
vec![
tokio::spawn(async move {
crate::distributor::Distributor::listen(
&*format!("0.0.0.0:{}", Config::get().distributor.port),
ServerType::Auto,
)
.await
.unwrap();
}),
tokio::spawn(async move {
crate::hub::Hub::listen(
&*format!("0.0.0.0:{}", Config::get().hub.port),
ServerType::Room,
)
.await
.unwrap();
}),
]
}
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