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|
use log::{debug, error, info};
use rocket::{
get,
http::hyper::Uri,
post,
response::content::RawJson,
routes,
serde::{json::Json, Serialize},
State,
};
use serde::Deserialize;
use std::{
cmp::Reverse,
collections::HashMap,
env::var,
net::IpAddr,
str::FromStr,
sync::Arc,
time::{Duration, Instant},
};
use tokio::{net::lookup_host, sync::RwLock, time::interval};
fn main() {
env_logger::init_from_env("LOG");
let registry = Arc::new(RwLock::new(Registry::default()));
tokio::runtime::Builder::new_multi_thread()
.enable_all()
.build()
.unwrap()
.block_on(async move {
tokio::task::spawn(Registry::update_loop(registry.clone()));
rocket::build()
.manage(registry)
.mount("/", routes![r_index, r_list, r_register])
.ignite()
.await
.unwrap()
.launch()
.await
.unwrap()
});
}
#[derive(Default)]
struct Registry {
response: Arc<str>,
servers: HashMap<u128, Entry>,
}
impl Registry {
pub async fn update_loop(r: Arc<RwLock<Self>>) {
let mut interval = interval(Duration::from_secs(
var("UPDATE_INTERVAL")
.map(|e| e.parse::<u64>().unwrap())
.unwrap_or(60),
));
loop {
interval.tick().await;
info!("updating list");
if let Err(e) = r.write().await.update() {
error!("update failed: {e}")
}
}
}
pub fn update(&mut self) -> anyhow::Result<()> {
self.servers.retain(|_, e| {
e.address
.retain(|_, updated| updated.elapsed() < Duration::from_secs(120));
e.address.len() > 0
});
let mut list = self
.servers
.values()
.map(|e| PublicEntry {
name: e.name.clone(),
address: e.address.keys().cloned().collect(),
last_game: e.last_game,
players_online: e.players_online,
})
.collect::<Vec<_>>();
list.sort_by_key(|e| Reverse(e.players_online));
self.response = serde_json::to_string(&list)?.into();
Ok(())
}
}
#[derive(Debug)]
struct Entry {
name: String,
address: HashMap<String, Instant>,
players_online: usize,
last_game: i64,
}
#[derive(Debug, Serialize)]
struct PublicEntry {
name: String,
address: Vec<String>,
players_online: usize,
last_game: i64,
}
impl Default for Entry {
fn default() -> Self {
Self {
address: HashMap::new(),
last_game: 0,
name: String::new(),
players_online: 0,
}
}
}
#[get("/")]
fn r_index() -> &'static str {
"Hurry Curry! registry service"
}
#[get("/v1/list")]
async fn r_list(registry: &State<Arc<RwLock<Registry>>>) -> RawJson<Arc<str>> {
RawJson(registry.read().await.response.clone())
}
#[derive(Debug, Deserialize)]
struct Submission {
secret: u128,
name: String,
players: usize,
last_game: i64,
uri: String,
}
#[post("/v1/register", data = "<submission>")]
async fn r_register<'a>(
client_addr: IpAddr,
registry: &State<Arc<RwLock<Registry>>>,
submission: Json<Submission>,
) -> Result<&'static str, &'static str> {
debug!("submission {submission:?}");
let uri = Uri::from_str(&submission.uri).map_err(|_| "invalid uri")?;
let scheme = uri.scheme().ok_or("no scheme")?.as_str();
let secure = match scheme {
"ws" => false,
"wss" => true,
_ => return Err("invalid scheme"),
};
let host = uri.host().ok_or("no host")?;
let port = uri.port_u16().unwrap_or(if secure { 443 } else { 27032 });
let uri_q = match IpAddr::from_str(host) {
Ok(mut addr) => {
if addr.is_unspecified() {
addr = client_addr;
}
if addr.is_loopback() {
return Err("loopback address");
}
if addr.is_multicast() {
return Err("multicast address");
}
if client_addr == addr {
format!("{scheme}://{addr}:{port}",)
} else {
return Err("source address does not match uri");
}
}
Err(_) => {
if lookup_host(format!("{host}:0"))
.await
.map_err(|_| "dns lookup failed")?
.find(|a| a.ip() == client_addr)
.is_some()
{
format!("{scheme}://{host}:{port}")
} else {
return Err("host verification failed");
}
}
};
let mut g = registry.write().await;
if g.servers.len() > 1000 {
return Err("too many registered servers");
}
info!("submission approved for {uri_q:?}");
let entry = g.servers.entry(submission.secret).or_default();
entry.name = submission.name.clone();
entry.players_online = submission.players;
entry.last_game = submission.last_game;
entry.address.insert(uri_q, Instant::now());
Ok("ok")
}
|
