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92 lines
3.0 KiB
Rust
92 lines
3.0 KiB
Rust
use std::mem;
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use std::sync::atomic::{AtomicU32, Ordering};
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use std::sync::Arc;
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#[allow(unused_imports)]
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use futures::prelude::*;
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use hyper::header::CONTENT_TYPE;
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use hyper::server::conn::Http;
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use hyper::service::service_fn;
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use hyper::{Body, Request, Response, StatusCode};
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use prometheus::{self, Encoder, TextEncoder};
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use tokio::net::TcpListener;
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use tokio::runtime::Handle;
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use crate::config::*;
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use crate::errors::*;
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use crate::varz::*;
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const METRICS_CONNECTION_TIMEOUT_SECS: u64 = 10;
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const METRICS_MAX_CONCURRENT_CONNECTIONS: u32 = 2;
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async fn handle_client_connection(
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req: Request<Body>,
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varz: Varz,
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path: Arc<String>,
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) -> Result<Response<Body>, Error> {
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let mut buffer = vec![];
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if req.uri().path() != path.as_str() {
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let response = Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Body::empty())?;
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return Ok(response);
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}
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let StartInstant(start_instant) = varz.start_instant;
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let uptime = start_instant.elapsed().as_secs();
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varz.uptime.set(uptime as _);
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let client_queries = varz.client_queries_udp.get() + varz.client_queries_tcp.get();
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varz.client_queries.set(client_queries as _);
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let metric_families = prometheus::gather();
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let encoder = TextEncoder::new();
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encoder.encode(&metric_families, &mut buffer)?;
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let response = Response::builder()
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.header(CONTENT_TYPE, encoder.format_type())
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.body(buffer.into())?;
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Ok(response)
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}
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#[allow(unreachable_code)]
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pub async fn prometheus_service(
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varz: Varz,
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metrics_config: MetricsConfig,
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runtime_handle: Handle,
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) -> Result<(), Error> {
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let path = Arc::new(metrics_config.path);
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let stream = TcpListener::bind(metrics_config.listen_addr).await?;
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let concurrent_connections = Arc::new(AtomicU32::new(0));
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loop {
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let (client, _client_addr) = match stream.accept().await {
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Ok(x) => x,
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Err(e) => {
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if e.kind() == std::io::ErrorKind::WouldBlock {
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continue;
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}
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warn!("Error accepting Prometheus connection: {}", e);
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continue;
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}
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};
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let count = concurrent_connections.fetch_add(1, Ordering::Relaxed);
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if count >= METRICS_MAX_CONCURRENT_CONNECTIONS {
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concurrent_connections.fetch_sub(1, Ordering::Relaxed);
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mem::drop(client);
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continue;
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}
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let path = path.clone();
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let varz = varz.clone();
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let service =
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service_fn(move |req| handle_client_connection(req, varz.clone(), path.clone()));
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let connection = Http::new().serve_connection(client, service);
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let concurrent_connections = concurrent_connections.clone();
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runtime_handle.spawn(
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tokio::time::timeout(
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std::time::Duration::from_secs(METRICS_CONNECTION_TIMEOUT_SECS),
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connection,
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)
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.map(move |_| {
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concurrent_connections.fetch_sub(1, Ordering::Relaxed);
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}),
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);
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}
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Ok(())
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}
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