better logging for relay configuration in boost

mev-boost-rs/src/service.rs

@@ -13,6 +13,7 @@ use serde::Deserialize;
 use std::{future::Future, net::Ipv4Addr, pin::Pin, task::Poll};
 use tokio::task::{JoinError, JoinHandle};
 use url::Url;
+use tracing::info;
 
 #[derive(Debug, Deserialize)]
 pub struct Config {
@@ -60,16 +61,23 @@ impl Service {
     pub fn from(config: Config) -> Self {
         let relays = parse_relay_endpoints(&config.relays);
 
-        if relays.is_empty() {
-            tracing::error!("no valid relays provided; please restart with correct configuration");
-        }
-
         Self { host: config.host, port: config.port, relays, network: config.network }
     }
 
     /// Spawns a new [`RelayMux`] and [`BlindedBlockProviderServer`] task
     pub fn spawn(self, context: Option<Context>) -> Result<ServiceHandle, Error> {
         let Self { host, port, relays, network } = self;
+
+        if relays.is_empty() {
+            tracing::error!("no valid relays provided; please restart with correct configuration");
+        } else {
+            let count = relays.len();
+            info!("configured with {count} relays");
+            for relay in &relays {
+                info!(?relay, "configured with relay");
+            }
+        }
+
         let context =
             if let Some(context) = context { context } else { Context::try_from(&network)? };
         let relays = relays.into_iter().map(Relay::from);

mev-rs/src/relay.rs

@@ -12,7 +12,7 @@ use ethereum_consensus::{
 use std::{fmt, ops::Deref};
 use url::Url;
 
-#[derive(Clone, Debug)]
+#[derive(Clone)]
 pub struct RelayEndpoint {
     url: Url,
     public_key: BlsPublicKey,
@@ -29,6 +29,13 @@ impl TryFrom<Url> for RelayEndpoint {
     }
 }
 
+impl fmt::Debug for RelayEndpoint {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
+        write!(f, "{0}", self.url)
+    }
+}
+
+
 #[derive(Clone)]
 pub struct Relay {
     provider: BlockProvider,