51 lines
1.8 KiB
Rust
51 lines
1.8 KiB
Rust
use crate::config::{Config};
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use lazy_static::lazy_static;
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use hyper::{Server, Response, Body, header::CONTENT_TYPE, service::service_fn_ok};
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use prometheus::{TextEncoder, Counter, Gauge, HistogramVec};
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use prometheus::*;
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use futures::future::Future;
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lazy_static! {
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static ref HTTP_COUNTER: Counter = register_counter!(opts!(
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"http_requests_total",
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"Total number of HTTP requests made.",
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labels! {"handler" => "all",}
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))
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.unwrap();
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static ref HTTP_BODY_GAUGE: Gauge = register_gauge!(opts!(
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"http_response_size_bytes",
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"The HTTP response sizes in bytes.",
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labels! {"handler" => "all",}
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))
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.unwrap();
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static ref HTTP_REQ_HISTOGRAM: HistogramVec = register_histogram_vec!(
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"http_request_duration_seconds",
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"The HTTP request latencies in seconds.",
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&["handler"]
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)
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.unwrap();
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}
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pub(crate) fn start_serving_metrics(config: &Config) {
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let serve_metrics = || {
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service_fn_ok(|_req| {
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HTTP_COUNTER.inc();
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let timer = HTTP_REQ_HISTOGRAM.with_label_values(&["all"]).start_timer();
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let metric_families = prometheus::gather();
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let mut buffer = vec![];
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let encoder = TextEncoder::new();
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encoder.encode(&metric_families, &mut buffer).unwrap();
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HTTP_BODY_GAUGE.set(buffer.len() as f64);
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let mut res = Response::new(Body::from(buffer));
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res.headers_mut().insert(CONTENT_TYPE, encoder.format_type().parse().unwrap());
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timer.observe_duration();
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res
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})
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};
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println!("Listening on {}", &config.listener);
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let server = Server::bind(&config.listener)
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.serve(serve_metrics)
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.map_err(|err| eprintln!("server error: {}", err));
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tokio::spawn(server);
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} |