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use futures::task::{Context, Poll};
use futures::{future::Future, task::AtomicWaker};
use serde::{Deserialize, Serialize};
use std::fs::File;
use std::io::Write;
use std::pin::Pin;
use std::time::Duration;
use std::{
collections::HashMap,
sync::{Arc, Mutex},
};
#[derive(Serialize, Deserialize, Debug)]
pub struct RequestMessage {
pub request_id: u32,
pub timeout: Duration,
pub content: Vec<u8>,
}
pub struct MatchCtx {
event_bus: Arc<Mutex<EventBus>>,
players: HashMap<u32, PlayerData>,
// output: MsgStreamHandle<String>,
log_sink: File,
}
impl MatchCtx {
pub fn new(
event_bus: Arc<Mutex<EventBus>>,
players: HashMap<u32, Box<dyn PlayerHandle>>,
log_file: File,
// log: MsgStreamHandle<String>,
) -> Self {
MatchCtx {
event_bus,
players: players
.into_iter()
.map(|(id, handle)| {
let player_handle = PlayerData {
request_ctr: 0,
handle,
};
(id, player_handle)
})
.collect(),
log_sink: log_file,
}
}
// TODO: implement a clean way to handle the player not existing
pub fn request(&mut self, player_id: u32, content: Vec<u8>, timeout: Duration) -> Request {
let player = self.players.get_mut(&player_id).unwrap();
let request_id = player.request_ctr;
player.request_ctr += 1;
player.handle.send_request(RequestMessage {
request_id,
content,
timeout,
});
return Request {
player_id,
request_id,
event_bus: self.event_bus.clone(),
};
}
pub fn send_info(&mut self, player_id: u32, msg: String) {
let player = self.players.get_mut(&player_id).unwrap();
player.handle.send_info(msg);
}
pub fn players(&self) -> Vec<u32> {
self.players.keys().cloned().collect()
}
// this method should be used to emit log states etc.
pub fn log_string(&mut self, message: String) {
write!(self.log_sink, "{}\n", message).expect("failed to write to log file");
}
}
pub trait PlayerHandle: Send {
fn send_request(&mut self, r: RequestMessage);
fn send_info(&mut self, msg: String);
}
struct PlayerData {
request_ctr: u32,
handle: Box<dyn PlayerHandle>,
}
type RequestId = (u32, u32);
pub struct EventBus {
request_responses: HashMap<RequestId, RequestResult<Vec<u8>>>,
wakers: HashMap<RequestId, AtomicWaker>,
}
impl EventBus {
pub fn new() -> Self {
EventBus {
request_responses: HashMap::new(),
wakers: HashMap::new(),
}
}
}
impl EventBus {
pub fn resolve_request(&mut self, id: RequestId, result: RequestResult<Vec<u8>>) {
if self.request_responses.contains_key(&id) {
// request already resolved
// TODO: maybe report this?
return;
}
self.request_responses.insert(id, result);
if let Some(waker) = self.wakers.remove(&id) {
waker.wake();
}
}
}
pub struct Request {
player_id: u32,
request_id: u32,
event_bus: Arc<Mutex<EventBus>>,
}
impl Request {
#[allow(dead_code)]
pub fn player_id(&self) -> u32 {
self.player_id
}
}
impl Future for Request {
type Output = RequestResult<Vec<u8>>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut event_bus = self.event_bus.lock().unwrap();
let request_id = (self.player_id, self.request_id);
if let Some(result) = event_bus.request_responses.get(&request_id) {
return Poll::Ready(result.clone());
}
event_bus
.wakers
.entry(request_id)
.or_insert_with(|| AtomicWaker::new())
.register(cx.waker());
return Poll::Pending;
}
}
#[derive(Debug, Clone)]
pub enum RequestError {
Timeout,
}
pub type RequestResult<T> = Result<T, RequestError>;
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