From 25dcdd9cd00ea4d67ff2e7f2f8a7a686dad6052e Mon Sep 17 00:00:00 2001
From: Alex Stokes <r.alex.stokes@gmail.com>
Date: Tue, 3 Oct 2023 15:48:41 -0600
Subject: [PATCH] boost: log which relays serve the best bid

---
 mev-boost-rs/src/relay_mux.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mev-boost-rs/src/relay_mux.rs b/mev-boost-rs/src/relay_mux.rs
index 617e7c57..6c62734a 100644
--- a/mev-boost-rs/src/relay_mux.rs
+++ b/mev-boost-rs/src/relay_mux.rs
@@ -15,7 +15,7 @@ use mev_rs::{
 use parking_lot::Mutex;
 use rand::prelude::*;
 use std::{cmp::Ordering, collections::HashMap, ops::Deref, sync::Arc, time::Duration};
-use tracing::warn;
+use tracing::{info, warn};
 
 // See note in the `mev-relay-rs::Relay` about this constant.
 // TODO likely drop this feature...
@@ -189,6 +189,13 @@ impl BlindedBlockProvider for RelayMux {
             }
         }
 
+        let relays_desc = best_relays
+            .iter()
+            .map(|relay| format!("{relay}"))
+            .reduce(|desc, next| format!("{desc}, {next}"))
+            .expect("at least one relay");
+        info!(slot = bid_request.slot, block_hash = %best_block_hash, relays=relays_desc, "acquired best bid");
+
         {
             let mut state = self.state.lock();
             // assume the next request to open a bid corresponds to the current request