147 lines
4.1 KiB
Rust
147 lines
4.1 KiB
Rust
use std::convert::Infallible;
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use std::net::SocketAddr;
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use std::sync::Arc;
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use std::time::SystemTime;
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use futures::future::*;
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use hyper::{
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header::CONTENT_TYPE,
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service::{make_service_fn, service_fn},
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Body, Method, Request, Response, Server,
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};
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use opentelemetry::{
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global,
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metrics::{BoundCounter, BoundValueRecorder},
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trace::{FutureExt, TraceContextExt, Tracer},
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Context,
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};
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use opentelemetry_prometheus::PrometheusExporter;
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use prometheus::{Encoder, TextEncoder};
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use garage_util::error::Error as GarageError;
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use garage_util::metrics::*;
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// serve_req on metric endpoint
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async fn serve_req(
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req: Request<Body>,
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admin_server: Arc<AdminServer>,
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) -> Result<Response<Body>, hyper::Error> {
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debug!("Receiving request at path {}", req.uri());
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let request_start = SystemTime::now();
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admin_server.metrics.http_counter.add(1);
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let response = match (req.method(), req.uri().path()) {
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(&Method::GET, "/metrics") => {
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let mut buffer = vec![];
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let encoder = TextEncoder::new();
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let tracer = opentelemetry::global::tracer("garage");
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let metric_families = tracer.in_span("admin/gather_metrics", |_| {
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admin_server.exporter.registry().gather()
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});
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encoder.encode(&metric_families, &mut buffer).unwrap();
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admin_server
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.metrics
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.http_body_gauge
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.record(buffer.len() as u64);
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Response::builder()
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.status(200)
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.header(CONTENT_TYPE, encoder.format_type())
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.body(Body::from(buffer))
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.unwrap()
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}
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_ => Response::builder()
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.status(404)
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.body(Body::from("Not implemented"))
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.unwrap(),
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};
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admin_server
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.metrics
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.http_req_histogram
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.record(request_start.elapsed().map_or(0.0, |d| d.as_secs_f64()));
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Ok(response)
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}
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// AdminServer hold the admin server internal admin_server and the metric exporter
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pub struct AdminServer {
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exporter: PrometheusExporter,
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metrics: AdminServerMetrics,
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}
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// GarageMetricadmin_server holds the metrics counter definition for Garage
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// FIXME: we would rather have that split up among the different libraries?
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struct AdminServerMetrics {
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http_counter: BoundCounter<u64>,
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http_body_gauge: BoundValueRecorder<u64>,
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http_req_histogram: BoundValueRecorder<f64>,
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}
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impl AdminServer {
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/// init initilialize the AdminServer and background metric server
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pub fn init() -> AdminServer {
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let exporter = opentelemetry_prometheus::exporter().init();
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let meter = global::meter("garage/admin_server");
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AdminServer {
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exporter,
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metrics: AdminServerMetrics {
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http_counter: meter
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.u64_counter("admin.http_requests_total")
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.with_description("Total number of HTTP requests made.")
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.init()
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.bind(&[]),
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http_body_gauge: meter
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.u64_value_recorder("admin.http_response_size_bytes")
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.with_description("The metrics HTTP response sizes in bytes.")
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.init()
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.bind(&[]),
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http_req_histogram: meter
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.f64_value_recorder("admin.http_request_duration_seconds")
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.with_description("The HTTP request latencies in seconds.")
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.init()
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.bind(&[]),
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},
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}
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}
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/// run execute the admin server on the designated HTTP port and listen for requests
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pub async fn run(
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self,
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bind_addr: SocketAddr,
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shutdown_signal: impl Future<Output = ()>,
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) -> Result<(), GarageError> {
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let admin_server = Arc::new(self);
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// For every connection, we must make a `Service` to handle all
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// incoming HTTP requests on said connection.
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let make_svc = make_service_fn(move |_conn| {
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let admin_server = admin_server.clone();
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// This is the `Service` that will handle the connection.
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// `service_fn` is a helper to convert a function that
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// returns a Response into a `Service`.
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async move {
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Ok::<_, Infallible>(service_fn(move |req| {
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let tracer = opentelemetry::global::tracer("garage");
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let span = tracer
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.span_builder("admin/request")
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.with_trace_id(gen_trace_id())
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.start(&tracer);
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serve_req(req, admin_server.clone())
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.with_context(Context::current_with_span(span))
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}))
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}
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});
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let server = Server::bind(&bind_addr).serve(make_svc);
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let graceful = server.with_graceful_shutdown(shutdown_signal);
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info!("Admin server listening on http://{}", bind_addr);
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graceful.await?;
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Ok(())
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}
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}
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