redact api key (#20)

src/server.rs

@@ -13,10 +13,12 @@ use self::routes::relayer::{
     purge_unsent_txs, relayer_rpc, update_relayer,
 };
 use self::routes::transaction::{get_tx, get_txs, send_tx};
+use self::trace_layer::MatchedPathMakeSpan;
 use crate::app::App;
 
 mod middleware;
 pub mod routes;
+mod trace_layer;
 
 #[derive(Debug, Error)]
 pub enum ApiError {
@@ -99,7 +101,10 @@ pub async fn spawn_server(
     let router = Router::new()
         .nest("/1", v1_routes)
         .route("/health", get(routes::health))
-        .layer(tower_http::trace::TraceLayer::new_for_http())
+        .layer(
+            tower_http::trace::TraceLayer::new_for_http()
+                .make_span_with(MatchedPathMakeSpan),
+        )
         .layer(axum::middleware::from_fn(middleware::log_response));
 
     let server = axum::Server::bind(&app.config.server.host)

src/server/trace_layer.rs

@@ -0,0 +1,25 @@
+use axum::extract::MatchedPath;
+use hyper::Request;
+use tower_http::trace::MakeSpan;
+use tracing::{Level, Span};
+
+/// MakeSpan to remove api keys from logs
+#[derive(Clone)]
+pub(crate) struct MatchedPathMakeSpan;
+
+impl<B> MakeSpan<B> for MatchedPathMakeSpan {
+    fn make_span(&mut self, request: &Request<B>) -> Span {
+        let matched_path = request
+            .extensions()
+            .get::<MatchedPath>()
+            .map(MatchedPath::as_str);
+
+        tracing::span!(
+            Level::DEBUG,
+            "request",
+            method = %request.method(),
+            matched_path,
+            version = ?request.version(),
+        )
+    }
+}