2020-09-14 16:08:57 +02:00
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use std::{sync::Arc, time::Instant};
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use crate::{futures::Future, rpc, rpc_apis};
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use parking_lot::Mutex;
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use hyper::{service::service_fn_ok, Body, Method, Request, Response, Server, StatusCode};
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use stats::{
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prometheus::{self, Encoder},
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2021-03-03 22:44:35 +01:00
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PrometheusMetrics, PrometheusRegistry,
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2020-09-14 16:08:57 +02:00
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};
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#[derive(Debug, Clone, PartialEq)]
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pub struct MetricsConfiguration {
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/// Are metrics enabled (default is false)?
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pub enabled: bool,
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2021-03-03 22:44:35 +01:00
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/// Prefix
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pub prefix: String,
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2020-09-14 16:08:57 +02:00
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/// The IP of the network interface used (default is 127.0.0.1).
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pub interface: String,
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/// The network port (default is 3000).
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pub port: u16,
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}
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impl Default for MetricsConfiguration {
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fn default() -> Self {
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MetricsConfiguration {
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enabled: false,
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2021-03-03 22:44:35 +01:00
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prefix: "".into(),
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2020-09-14 16:08:57 +02:00
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interface: "127.0.0.1".into(),
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port: 3000,
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}
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}
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}
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struct State {
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rpc_apis: Arc<rpc_apis::FullDependencies>,
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}
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2021-03-03 22:44:35 +01:00
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fn handle_request(
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req: Request<Body>,
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conf: Arc<MetricsConfiguration>,
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state: Arc<Mutex<State>>,
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) -> Response<Body> {
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2020-09-14 16:08:57 +02:00
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let (parts, _body) = req.into_parts();
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match (parts.method, parts.uri.path()) {
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(Method::GET, "/metrics") => {
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let start = Instant::now();
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2021-03-03 22:44:35 +01:00
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let mut reg = PrometheusRegistry::new(conf.prefix.clone());
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2020-09-14 16:08:57 +02:00
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let state = state.lock();
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state.rpc_apis.client.prometheus_metrics(&mut reg);
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state.rpc_apis.sync.prometheus_metrics(&mut reg);
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let elapsed = start.elapsed();
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2021-03-03 22:44:35 +01:00
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reg.register_gauge(
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2020-09-14 16:08:57 +02:00
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"metrics_time",
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"Time to perform rpc metrics",
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elapsed.as_millis() as i64,
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);
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let mut buffer = vec![];
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let encoder = prometheus::TextEncoder::new();
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2021-03-03 22:44:35 +01:00
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let metric_families = reg.registry().gather();
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2020-09-14 16:08:57 +02:00
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encoder
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.encode(&metric_families, &mut buffer)
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.expect("all source of metrics are static; qed");
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let text = String::from_utf8(buffer).expect("metrics encoding is ASCII; qed");
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Response::new(Body::from(text))
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}
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(_, _) => {
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let mut res = Response::new(Body::from("not found"));
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*res.status_mut() = StatusCode::NOT_FOUND;
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res
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}
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}
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}
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/// Start the prometheus metrics server accessible via GET <host>:<port>/metrics
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pub fn start_prometheus_metrics(
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conf: &MetricsConfiguration,
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deps: &rpc::Dependencies<rpc_apis::FullDependencies>,
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) -> Result<(), String> {
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if !conf.enabled {
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return Ok(());
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}
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let addr = format!("{}:{}", conf.interface, conf.port);
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let addr = addr
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.parse()
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.map_err(|err| format!("Failed to parse address '{}': {}", addr, err))?;
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let state = State {
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rpc_apis: deps.apis.clone(),
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};
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let state = Arc::new(Mutex::new(state));
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2021-03-03 22:44:35 +01:00
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let conf = Arc::new(conf.to_owned());
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2020-09-14 16:08:57 +02:00
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let server = Server::bind(&addr)
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.serve(move || {
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// This is the `Service` that will handle the connection.
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// `service_fn_ok` is a helper to convert a function that
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// returns a Response into a `Service`.
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let state = state.clone();
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2021-03-03 22:44:35 +01:00
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let conf = conf.clone();
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service_fn_ok(move |req: Request<Body>| {
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handle_request(req, conf.clone(), state.clone())
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})
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2020-09-14 16:08:57 +02:00
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})
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.map_err(|e| eprintln!("server error: {}", e));
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2021-03-03 22:44:35 +01:00
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info!("Started prometeus metrics at http://{}/metrics", addr);
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2020-09-14 16:08:57 +02:00
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deps.executor.spawn(server);
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Ok(())
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}
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