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|
use std::time::Instant;
use axum::{
extract::{MatchedPath, Request},
middleware::Next,
response::IntoResponse,
};
use metrics_exporter_prometheus::{Matcher, PrometheusBuilder, PrometheusHandle};
pub 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,
];
PrometheusBuilder::new()
.set_buckets_for_metric(
Matcher::Full("http_requests_duration_seconds".to_string()),
EXPONENTIAL_SECONDS,
)
.unwrap()
.install_recorder()
.unwrap()
}
/// Middleware to record some common HTTP metrics
/// Generic over B to allow for arbitrary body types (eg Vec<u8>, Streams, a deserialized thing, etc)
/// Someday tower-http might provide a metrics middleware: https://github.com/tower-rs/tower-http/issues/57
pub 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();
// Run the rest of the request handling first, so we can measure it and get response
// codes.
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::increment_counter!("http_requests_total", &labels);
metrics::histogram!("http_requests_duration_seconds", latency, &labels);
response
}
|
