refactor(metrics): replace hyper implementation with axum

Cargo.toml

@@ -113,6 +113,7 @@ aws-smithy-types = { version = "1", default-features = false, features = [
 ] }
 aws-endpoint = "0.60"
 aws-types = "1"
+axum = "=0.7.4" # TODO: 0.7.5+ does not work with current toolchain
 etcd-client = { package = "madsim-etcd-client", version = "0.4" }
 futures-async-stream = "0.2.9"
 hytra = "0.1"

src/common/common_service/Cargo.toml

@@ -16,6 +16,7 @@ normal = ["workspace-hack"]
 
 [dependencies]
 async-trait = "0.1"
+axum = { workspace = true }
 futures = { version = "0.3", default-features = false, features = ["alloc"] }
 hyper = "0.14" # required by tonic
 prometheus = { version = "0.13" }
@@ -27,7 +28,7 @@ thiserror-ext = { workspace = true }
 tokio = { version = "0.2", package = "madsim-tokio", features = ["rt", "rt-multi-thread", "sync", "macros", "time", "signal"] }
 tonic = { workspace = true }
 tower = { version = "0.4", features = ["util", "load-shed"] }
-tower-http = { version = "0.4", features = ["add-extension", "cors"] }
+tower-http = { version = "0.5", features = ["add-extension"] }
 tracing = "0.1"
 
 [target.'cfg(not(madsim))'.dependencies]

src/common/common_service/src/metrics_manager.rs

@@ -12,16 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::net::SocketAddr;
 use std::ops::Deref;
 use std::sync::OnceLock;
 
-use hyper::{Body, Request, Response};
+use axum::body::Body;
+use axum::response::{IntoResponse, Response};
+use axum::{Extension, Router};
 use prometheus::{Encoder, Registry, TextEncoder};
 use risingwave_common::monitor::GLOBAL_METRICS_REGISTRY;
 use thiserror_ext::AsReport;
-use tower::make::Shared;
-use tower::ServiceBuilder;
+use tokio::net::TcpListener;
 use tower_http::add_extension::AddExtensionLayer;
 use tracing::{error, info, warn};
 
@@ -31,28 +31,27 @@ impl MetricsManager {
     pub fn boot_metrics_service(listen_addr: String) {
         static METRICS_SERVICE_LISTEN_ADDR: OnceLock<String> = OnceLock::new();
         let new_listen_addr = listen_addr.clone();
-        let current_listen_addr = METRICS_SERVICE_LISTEN_ADDR.get_or_init(|| {
-            let listen_addr_clone = listen_addr.clone();
-            tokio::spawn(async move {
-                info!(
-                    "Prometheus listener for Prometheus is set up on http://{}",
-                    listen_addr
-                );
-                let listen_socket_addr: SocketAddr = listen_addr.parse().unwrap();
-                let service = ServiceBuilder::new()
-                    .layer(AddExtensionLayer::new(
-                        GLOBAL_METRICS_REGISTRY.deref().clone(),
-                    ))
-                    .service_fn(Self::metrics_service);
-                // TODO: use axum server
-                let serve_future =
-                    hyper::Server::bind(&listen_socket_addr).serve(Shared::new(service));
-                if let Err(err) = serve_future.await {
-                    error!(error = %err.as_report(), "metrics service exited with error");
-                }
+        let current_listen_addr =
+            METRICS_SERVICE_LISTEN_ADDR.get_or_init(|| {
+                let listen_addr_clone = listen_addr.clone();
+                tokio::spawn(async move {
+                    info!(
+                        "Prometheus listener for Prometheus is set up on http://{}",
+                        listen_addr
+                    );
+
+                    let service = Router::new().fallback(Self::metrics_service).layer(
+                        AddExtensionLayer::new(GLOBAL_METRICS_REGISTRY.deref().clone()),
+                    );
+
+                    let serve_future =
+                        axum::serve(TcpListener::bind(&listen_addr).await.unwrap(), service);
+                    if let Err(err) = serve_future.await {
+                        error!(error = %err.as_report(), "metrics service exited with error");
+                    }
+                });
+                listen_addr_clone
             });
-            listen_addr_clone
-        });
         if new_listen_addr != *current_listen_addr {
             warn!(
                 "unable to listen port {} for metrics service. Currently listening on {}",
@@ -62,17 +61,15 @@ impl MetricsManager {
     }
 
     #[expect(clippy::unused_async, reason = "required by service_fn")]
-    async fn metrics_service(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
-        let registry = req.extensions().get::<Registry>().unwrap();
+    async fn metrics_service(Extension(registry): Extension<Registry>) -> impl IntoResponse {
         let encoder = TextEncoder::new();
         let mut buffer = vec![];
         let mf = registry.gather();
         encoder.encode(&mf, &mut buffer).unwrap();
-        let response = Response::builder()
-            .header(hyper::header::CONTENT_TYPE, encoder.format_type())
-            .body(Body::from(buffer))
-            .unwrap();
 
-        Ok(response)
+        Response::builder()
+            .header(axum::http::header::CONTENT_TYPE, encoder.format_type())
+            .body(Body::from(buffer))
+            .unwrap()
     }
 }

src/meta/Cargo.toml

@@ -85,7 +85,7 @@ url = "2"
 uuid = { version = "1", features = ["v4"] }
 
 [target.'cfg(not(madsim))'.dependencies]
-axum = "=0.7.4" # TODO: 0.7.5+ does not work with current toolchain
+axum = { workspace = true }
 tower-http = { version = "0.5", features = [
     "add-extension",
     "cors",

src/meta/dashboard/Cargo.toml

@@ -10,7 +10,7 @@ repository = { workspace = true }
 
 [dependencies]
 anyhow = "1"
-axum = "=0.7.4" # TODO: 0.7.5+ does not work with current toolchain
+axum = { workspace = true }
 axum-embed = "0.1"
 bytes = "1"
 hyper = "1"