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|
use chrono::Utc;
use hyper::{
service::{make_service_fn, service_fn},
Body, Method, Request, Response, Server, StatusCode,
};
use lazy_static::lazy_static;
use ratman_identity::Identity;
use std::{
collections::BTreeMap,
convert::Infallible,
env,
fs::OpenOptions,
io::Write,
net::SocketAddr,
path::PathBuf,
sync::{
atomic::{AtomicUsize, Ordering},
Mutex,
},
thread,
time::Duration,
};
lazy_static! {
static ref STATE: Mutex<BTreeMap<Identity, MetricEntry>> = Mutex::new(BTreeMap::new());
}
/// An entry of metrics data
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
struct MetricEntry {}
fn dump_metrics() {
let p = env::var("BROOK_METRICS_PATH").unwrap_or("metrics.csv".into());
let path = PathBuf::new().join(p);
loop {
let time = Utc::now();
let mut map = STATE.lock().unwrap();
let metrics: Vec<()> = map.iter().map(|_| ()).collect();
map.clear();
drop(map);
let line = format!(
"{},{}\n",
time.format("%Y-%m-%d_%H:%M:%S UTC"),
metrics.len(),
);
let mut file = OpenOptions::new()
.write(true)
.append(true)
.create(true)
.open(&path)
.unwrap();
file.write_all(line.as_bytes()).unwrap();
// Wait for a while before doing it again
thread::sleep(Duration::from_secs(15));
}
}
fn get() -> Result<Response<Body>, Infallible> {
let mut resp = Response::new(Body::empty());
*resp.body_mut() = Body::from(
"<!DOCTYPE html>
<html>
<head><title>brook-metrics</title></head>
<body>
<p>
Your brook-metrics server is now reachable! \
Point your brook clients towards $ADDR/report
</p>
</body>
</html>",
);
Ok(resp)
}
async fn post(req: Request<Body>) -> Result<Response<Body>, Infallible> {
let full_body = hyper::body::to_bytes(req.into_body()).await.unwrap();
let body_str = String::from_utf8(full_body.to_vec()).unwrap();
let parsed = json::parse(&body_str).unwrap();
// Either get the ID or create a new one
let id = match parsed {
json::JsonValue::Object(mut obj) => obj.remove("id"),
_ => unreachable!(),
}
.map(|jv| match jv {
json::JsonValue::String(ref s) => Identity::from_string(s),
_ => unreachable!(),
})
.map(|id| {
eprintln!("[DEBUG] Returning client {}", id);
id
})
.unwrap_or_else(|| {
eprintln!("[DEBUG] Adding new stream client!");
Identity::random()
});
STATE.lock().unwrap().insert(id, MetricEntry {});
Ok(Response::builder()
.header("Content-Type", "text/json")
.status(StatusCode::OK)
.body(Body::from(format!("{{ \"id\": \"{}\" }}", id.to_string())))
.unwrap())
}
fn get_current() -> Result<Response<Body>, Infallible> {
let len = STATE.lock().unwrap().len();
Ok(Response::builder()
.header("Content-Type", "text/json")
.status(StatusCode::OK)
.body(Body::from(format!("{{ \"num\": {} }}", len)))
.unwrap())
}
async fn handle_request(req: Request<Body>) -> Result<Response<Body>, Infallible> {
match (req.method(), req.uri().path()) {
// TODO: make this prefix configurable
(&Method::GET, "/metrics") => get(),
(&Method::GET, "/metrics/current") => get_current(),
(&Method::POST, "/metrics/update") => post(req).await,
_ => {
let resp = Response::builder()
.status(StatusCode::NOT_FOUND)
.body(Body::from("Nothing here, I'm afraid!"))
.unwrap();
Ok(resp)
}
}
}
#[tokio::main]
async fn main() {
eprintln!("ID Length: {}", ratman_identity::ID_LEN);
thread::spawn(|| dump_metrics());
let addr = SocketAddr::from(([0, 0, 0, 0], 7667));
let service = make_service_fn(|_c| async { Ok::<_, Infallible>(service_fn(handle_request)) });
eprintln!("Bindng address: 0.0.0.0:7667");
let server = Server::bind(&addr).serve(service);
if let Err(e) = server.await {
eprintln!("[ERROR]: {}", e);
}
}
|
