114 lines
3.5 KiB
Rust
114 lines
3.5 KiB
Rust
use axum::headers::{ContentType, HeaderName};
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use axum::http::HeaderValue;
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use axum::response::{IntoResponse, Response};
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use axum::{routing::get, Extension, Router, TypedHeader};
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use prometheus_client::encoding::text::encode;
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use prometheus_client::encoding::text::Encode;
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use prometheus_client::metrics::counter::Counter;
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use prometheus_client::metrics::family::Family;
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use prometheus_client::registry::Registry;
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use std::net::SocketAddr;
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use std::sync::Arc;
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use tracing::info;
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#[derive(Clone, Hash, PartialEq, Eq, Encode)]
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pub struct ProxyRequestLabels {
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protocol: Protocol,
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rpc_method: String,
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/// anonymous is user 0
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user_id: u64,
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}
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#[derive(Clone, Hash, PartialEq, Eq, Encode)]
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pub enum Protocol {
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HTTP,
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Websocket,
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}
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pub struct AppStatsRegistry {
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pub registry: Registry,
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pub stats: AppStats,
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}
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#[derive(Clone)]
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pub struct AppStats {
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pub proxy_requests: Family<ProxyRequestLabels, Counter>,
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}
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impl AppStatsRegistry {
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pub fn new() -> Arc<Self> {
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// Note the angle brackets to make sure to use the default (dynamic
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// dispatched boxed metric) for the generic type parameter.
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let mut registry = <Registry>::default();
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// stats for GET and POST
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let proxy_requests = Family::<ProxyRequestLabels, Counter>::default();
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registry.register(
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// With the metric name.
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"http_requests",
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// And the metric help text.
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"Number of HTTP requests received",
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Box::new(proxy_requests.clone()),
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);
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let new = Self {
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registry,
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stats: AppStats { proxy_requests },
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};
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Arc::new(new)
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}
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pub async fn serve(self: Arc<Self>, port: u16) -> anyhow::Result<()> {
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// build our application with a route
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// order most to least common
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// TODO: 404 any unhandled routes?
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let app = Router::new()
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.route("/", get(root))
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.layer(Extension(self.clone()));
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// run our app with hyper
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// TODO: allow only listening on localhost?
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let addr = SocketAddr::from(([0, 0, 0, 0], port));
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info!("prometheus listening on port {}", port);
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// TODO: into_make_service is enough if we always run behind a proxy. make into_make_service_with_connect_info optional?
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/*
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It sequentially looks for an IP in:
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- x-forwarded-for header (de-facto standard)
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- x-real-ip header
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- forwarded header (new standard)
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- axum::extract::ConnectInfo (if not behind proxy)
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So we probably won't need into_make_service_with_connect_info, but it shouldn't hurt
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*/
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let service = app.into_make_service_with_connect_info::<SocketAddr>();
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// let service = app.into_make_service();
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// `axum::Server` is a re-export of `hyper::Server`
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axum::Server::bind(&addr)
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// TODO: option to use with_connect_info. we want it in dev, but not when running behind a proxy, but not
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.serve(service)
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.await
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.map_err(Into::into)
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}
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}
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async fn root(Extension(stats_registry): Extension<Arc<AppStatsRegistry>>) -> Response {
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let mut buffer = vec![];
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encode(&mut buffer, &stats_registry.registry).unwrap();
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let s = String::from_utf8(buffer).unwrap();
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let mut r = s.into_response();
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// // TODO: is there an easier way to do this?
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r.headers_mut().insert(
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HeaderName::from_static("content-type"),
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HeaderValue::from_static("application/openmetrics-text; version=1.0.0; charset=utf-8"),
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);
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r
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}
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