2022-03-05 09:15:10 -05:00
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// Copyright 2022 Protocol Labs.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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use hyper::http::StatusCode;
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use hyper::service::Service;
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use hyper::{Body, Method, Request, Response, Server};
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use log::{error, info};
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use prometheus_client::encoding::text::encode;
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use prometheus_client::registry::Registry;
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use std::future::Future;
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use std::pin::Pin;
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use std::sync::{Arc, Mutex};
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use std::task::{Context, Poll};
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2023-01-03 20:42:32 +01:00
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const METRICS_CONTENT_TYPE: &str = "application/openmetrics-text;charset=utf-8;version=1.0.0";
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2022-03-05 09:15:10 -05:00
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pub async fn metrics_server(registry: Registry) -> Result<(), std::io::Error> {
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// Serve on localhost.
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let addr = ([127, 0, 0, 1], 0).into();
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// Use the tokio runtime to run the hyper server.
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let rt = tokio::runtime::Runtime::new()?;
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rt.block_on(async {
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let server = Server::bind(&addr).serve(MakeMetricService::new(registry));
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info!("Metrics server on http://{}/metrics", server.local_addr());
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if let Err(e) = server.await {
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error!("server error: {}", e);
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}
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Ok(())
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})
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}
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pub struct MetricService {
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reg: Arc<Mutex<Registry>>,
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}
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type SharedRegistry = Arc<Mutex<Registry>>;
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impl MetricService {
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fn get_reg(&mut self) -> SharedRegistry {
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Arc::clone(&self.reg)
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}
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2023-01-03 20:42:32 +01:00
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fn respond_with_metrics(&mut self) -> Response<String> {
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let mut response: Response<String> = Response::default();
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response.headers_mut().insert(
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hyper::header::CONTENT_TYPE,
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METRICS_CONTENT_TYPE.try_into().unwrap(),
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);
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2022-03-05 09:15:10 -05:00
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let reg = self.get_reg();
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2023-01-03 20:42:32 +01:00
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encode(&mut response.body_mut(), ®.lock().unwrap()).unwrap();
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*response.status_mut() = StatusCode::OK;
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response
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2022-03-05 09:15:10 -05:00
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}
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2023-01-03 20:42:32 +01:00
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fn respond_with_404_not_found(&mut self) -> Response<String> {
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2022-03-05 09:15:10 -05:00
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Response::builder()
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.status(StatusCode::NOT_FOUND)
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2023-01-03 20:42:32 +01:00
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.body("Not found try localhost:[port]/metrics".to_string())
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2022-03-05 09:15:10 -05:00
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.unwrap()
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}
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}
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impl Service<Request<Body>> for MetricService {
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2023-01-03 20:42:32 +01:00
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type Response = Response<String>;
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2022-03-05 09:15:10 -05:00
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type Error = hyper::Error;
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type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
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fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
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Poll::Ready(Ok(()))
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}
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fn call(&mut self, req: Request<Body>) -> Self::Future {
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let req_path = req.uri().path();
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let req_method = req.method();
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let resp = if (req_method == Method::GET) && (req_path == "/metrics") {
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// Encode and serve metrics from registry.
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self.respond_with_metrics()
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} else {
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self.respond_with_404_not_found()
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};
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Box::pin(async { Ok(resp) })
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}
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}
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pub struct MakeMetricService {
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reg: SharedRegistry,
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}
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impl MakeMetricService {
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pub fn new(registry: Registry) -> MakeMetricService {
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MakeMetricService {
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reg: Arc::new(Mutex::new(registry)),
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}
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}
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}
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impl<T> Service<T> for MakeMetricService {
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type Response = MetricService;
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type Error = hyper::Error;
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type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
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fn poll_ready(&mut self, _: &mut Context) -> Poll<Result<(), Self::Error>> {
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Poll::Ready(Ok(()))
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}
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fn call(&mut self, _: T) -> Self::Future {
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let reg = self.reg.clone();
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let fut = async move { Ok(MetricService { reg }) };
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Box::pin(fut)
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}
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}
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