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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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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 std::sync::Arc;
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use tokio::net::TcpListener;
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use tokio::prelude::*;
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use tokio::runtime::Runtime;
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const METRICS_CONNECTION_TIMEOUT_SECS: u64 = 10;
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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 f64);
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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);
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let cached_queries = varz.client_queries_cached.get();
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let cache_hit_ratio = if client_queries <= 0.0 {
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0.0
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} else {
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cached_queries as f64 * 100.0 / client_queries as f64
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};
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varz.cache_hit_ratio.set(cache_hit_ratio);
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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: Arc<Runtime>,
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) -> Result<(), Error> {
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let path = Arc::new(metrics_config.path);
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let mut stream = TcpListener::bind(metrics_config.listen_addr).await?;
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loop {
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let (client, _client_addr) = stream.accept().await?;
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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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runtime.spawn(
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connection
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.timeout(std::time::Duration::from_secs(
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METRICS_CONNECTION_TIMEOUT_SECS,
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))
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.map(|_| {}),
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);
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}
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Ok(())
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}
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