massa_metrics/
server.rs

1use std::net::SocketAddr;
2
3use hyper::service::make_service_fn;
4use hyper::{body::Body, header::CONTENT_TYPE, service::service_fn, Request, Response};
5use prometheus::{Encoder, TextEncoder};
6use tracing::{error, info};
7
8use crate::MetricsStopper;
9
10#[allow(dead_code)]
11pub(crate) fn bind_metrics(addr: SocketAddr) -> MetricsStopper {
12    let (tx, rx) = tokio::sync::oneshot::channel::<()>();
13    let handle = std::thread::spawn(move || {
14        let rt = tokio::runtime::Builder::new_current_thread()
15            .enable_all()
16            .build()
17            .expect("error on build tokio runtime for metrics server");
18
19        rt.block_on(async {
20            let server = hyper::Server::bind(&addr).serve(make_service_fn(|_| async {
21                Ok::<_, hyper::Error>(service_fn(serve_req))
22            }));
23
24            let graceful_server = server.with_graceful_shutdown(async {
25                rx.await.ok();
26            });
27            info!("METRICS | listening on http://{}", addr);
28            if let Err(e) = graceful_server.await {
29                error!("metrics server error: {}", e);
30            }
31            info!("METRICS | server stopped");
32        });
33    });
34    MetricsStopper {
35        stopper: Some(tx),
36        stop_handle: Some(handle),
37    }
38}
39
40#[allow(dead_code)]
41async fn serve_req(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
42    if req.uri().path() != "/metrics" {
43        // return hyper error
44        Ok(Response::builder()
45            .status(404)
46            .body(Body::from("Not Found"))
47            .unwrap())
48    } else {
49        let encoder = TextEncoder::new();
50        let mut buffer = vec![];
51        encoder
52            .encode(&prometheus::gather(), &mut buffer)
53            .expect("Failed to encode metrics");
54
55        let response = Response::builder()
56            .status(200)
57            .header(CONTENT_TYPE, encoder.format_type())
58            .body(Body::from(buffer))
59            .unwrap();
60
61        Ok(response)
62    }
63}
massa_metrics/server.rs

massa_metrics/
server.rs
