Merge pull request #29 from flashbots/health-check

Add health check endpoint

src/proxy.rs

@@ -58,6 +58,12 @@ where
     }
 
     fn call(&mut self, req: HttpRequest<HttpBody>) -> Self::Future {
+        match req.uri().path() {
+            "/healthz" => return Box::pin(async { Ok(Self::Response::new(HttpBody::from("OK"))) }),
+            "/metrics" => {}
+            _ => {}
+        };
+
         let target_url = self.target_url.clone();
         let client = self.client.clone();
         let mut inner = self.inner.clone();
@@ -86,7 +92,10 @@ where
                 message = "received json rpc request for",
                 method = method.method
             );
-            if PROXY_METHODS.iter().any(|&m| method.method.starts_with(m)) {
+            if MULTIPLEX_METHODS
+                .iter()
+                .any(|&m| method.method.starts_with(m))
+            {
                 // let rpc server handle engine rpc requests
                 let res = inner.call(req).await.map_err(|e| e.into())?;
                 Ok(res)
@@ -110,6 +119,7 @@ where
 mod tests {
     use std::net::SocketAddr;
 
+    use http_body_util::BodyExt;
     use jsonrpsee::{
         core::{client::ClientT, ClientError},
         http_client::HttpClient,
@@ -130,6 +140,8 @@ mod tests {
         proxy_success().await;
         proxy_failure().await;
         does_not_proxy_engine_method().await;
+        does_not_proxy_eth_send_raw_transaction_method().await;
+        health_check().await;
     }
 
     async fn proxy_success() {
@@ -154,6 +166,37 @@ mod tests {
         assert_eq!(response.unwrap(), "engine response");
     }
 
+    async fn does_not_proxy_eth_send_raw_transaction_method() {
+        let response = send_request("eth_sendRawTransaction").await;
+        assert!(response.is_ok());
+        assert_eq!(response.unwrap(), "raw transaction response");
+    }
+
+    async fn health_check() {
+        let proxy_server = spawn_proxy_server().await;
+        // Create a new HTTP client
+        let client: Client<HttpConnector, HttpBody> =
+            Client::builder(TokioExecutor::new()).build_http();
+
+        // Test the health check endpoint
+        let health_check_url = format!("http://{ADDR}:{PORT}/healthz");
+        let health_response = client.get(health_check_url.parse::<Uri>().unwrap()).await;
+        assert!(health_response.is_ok());
+        let b = health_response
+            .unwrap()
+            .into_body()
+            .collect()
+            .await
+            .unwrap()
+            .to_bytes();
+        // Convert the collected bytes to a string
+        let body_string = String::from_utf8(b.to_vec()).unwrap();
+        assert_eq!(body_string, "OK");
+
+        proxy_server.stop().unwrap();
+        proxy_server.stopped().await;
+    }
+
     async fn send_request(method: &str) -> Result<String, ClientError> {
         let server = spawn_server().await;
         let proxy_server = spawn_proxy_server().await;
@@ -208,6 +251,11 @@ mod tests {
         module
             .register_method("engine_method", |_, _, _| "engine response")
             .unwrap();
+        module
+            .register_method("eth_sendRawTransaction", |_, _, _| {
+                "raw transaction response"
+            })
+            .unwrap();
         module
             .register_method("non_existent_method", |_, _, _| "no proxy response")
             .unwrap();