58 lines
2.0 KiB
Rust
58 lines
2.0 KiB
Rust
use axum::headers::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};
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use log::info;
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use std::net::SocketAddr;
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use std::sync::Arc;
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use crate::app::Web3ProxyApp;
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/// Run a prometheus metrics server on the given port.
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pub async fn serve(app: Arc<Web3ProxyApp>, 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().route("/", get(root)).layer(Extension(app));
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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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async fn root(Extension(app): Extension<Arc<Web3ProxyApp>>) -> Response {
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let serialized = app.prometheus_metrics().await;
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let mut r = serialized.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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