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//
// Copyright (c) 2025 murilo ijanc' <murilo@ijanc.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
use std::{
future::ready,
time::{Duration, Instant},
};
use axum::{
Router,
extract::{MatchedPath, Request},
middleware::Next,
response::IntoResponse,
routing::get,
};
use metrics_exporter_prometheus::{
Matcher, PrometheusBuilder, PrometheusHandle,
};
use crate::helpers;
pub(crate) async fn start_metrics_server() -> anyhow::Result<()> {
let app = metrics_app();
let listener = tokio::net::TcpListener::bind("127.0.0.1:3001").await?;
tracing::info!("metrics listening on {}", listener.local_addr()?);
axum::serve(listener, app)
.with_graceful_shutdown(helpers::shutdown_signal())
.await?;
Ok(())
}
fn metrics_app() -> Router {
let recorder_handle = setup_metrics_recorder();
Router::new()
.route("/metrics", get(move || ready(recorder_handle.render())))
}
fn setup_metrics_recorder() -> PrometheusHandle {
const EXPONENTIAL_SECONDS: &[f64] =
&[0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0];
let recorder_handle = PrometheusBuilder::new()
.set_buckets_for_metric(
Matcher::Full("http_requests_duration_seconds".to_string()),
EXPONENTIAL_SECONDS,
)
.unwrap()
.install_recorder()
.unwrap();
let upkeep_handle = recorder_handle.clone();
tokio::spawn(async move {
loop {
tokio::time::sleep(Duration::from_secs(5)).await;
upkeep_handle.run_upkeep();
}
});
recorder_handle
}
pub(crate) async fn track_metrics(
req: Request,
next: Next,
) -> impl IntoResponse {
let start = Instant::now();
let path =
if let Some(matched_path) = req.extensions().get::<MatchedPath>() {
matched_path.as_str().to_owned()
} else {
req.uri().path().to_owned()
};
let method = req.method().clone();
let response = next.run(req).await;
let latency = start.elapsed().as_secs_f64();
let status = response.status().as_u16().to_string();
let labels =
[("method", method.to_string()), ("path", path), ("status", status)];
metrics::counter!("http_requests_total", &labels).increment(1);
metrics::histogram!("http_requests_duration_seconds", &labels)
.record(latency);
response
}
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