Multi bid observer (#604)

## 📝 Summary

New BidObserverMultiplexer to allow to plug multiple BidObserver.
Some parameter changes on BidObserver::block_submitted.

## ✅ I have completed the following steps:

* [X] Run `make lint`
* [X] Run `make test`
* [ ] Added tests (if applicable)

Author: ZanCorDX

crates/rbuilder/src/live_builder/block_output/bid_observer.rs

@@ -1,17 +1,21 @@
 use alloy_primitives::U256;
 use reth_primitives::SealedBlock;
 
-use crate::{building::BuiltBlockTrace, mev_boost::submission::SubmitBlockRequest};
+use crate::{
+    building::BuiltBlockTrace, live_builder::payload_events::MevBoostSlotData,
+    mev_boost::submission::SubmitBlockRequest,
+};
 
 /// Trait that receives every bid made by us to the relays.
 pub trait BidObserver: std::fmt::Debug {
     /// This callback is executed after the bid was made so it gives away ownership of the data.
     /// This should NOT block since it's executed in the submitting thread.
     fn block_submitted(
         &self,
-        sealed_block: SealedBlock,
-        submit_block_request: SubmitBlockRequest,
-        built_block_trace: BuiltBlockTrace,
+        slot_data: &MevBoostSlotData,
+        sealed_block: &SealedBlock,
+        submit_block_request: &SubmitBlockRequest,
+        built_block_trace: &BuiltBlockTrace,
         builder_name: String,
         best_bid_value: U256,
     );
@@ -23,9 +27,10 @@ pub struct NullBidObserver {}
 impl BidObserver for NullBidObserver {
     fn block_submitted(
         &self,
-        _sealed_block: SealedBlock,
-        _submit_block_request: SubmitBlockRequest,
-        _built_block_trace: BuiltBlockTrace,
+        _slot_data: &MevBoostSlotData,
+        _sealed_block: &SealedBlock,
+        _submit_block_request: &SubmitBlockRequest,
+        _built_block_trace: &BuiltBlockTrace,
         _builder_name: String,
         _best_bid_value: U256,
     ) {

crates/rbuilder/src/live_builder/block_output/bid_observer_multiplexer.rs

@@ -0,0 +1,49 @@
+use reth_primitives::SealedBlock;
+
+use crate::{
+    building::BuiltBlockTrace, live_builder::payload_events::MevBoostSlotData,
+    mev_boost::submission::SubmitBlockRequest,
+};
+
+use super::bid_observer::BidObserver;
+
+/// Implements BidObserver forwarding all calls to several BidObservers.
+#[derive(Default)]
+pub struct BidObserverMultiplexer {
+    observers: Vec<Box<dyn BidObserver + Send + Sync>>,
+}
+
+impl std::fmt::Debug for BidObserverMultiplexer {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        f.debug_struct("BidObserverMultiplexer").finish()
+    }
+}
+
+impl BidObserverMultiplexer {
+    pub fn push(&mut self, obs: Box<dyn BidObserver + Send + Sync>) {
+        self.observers.push(obs);
+    }
+}
+
+impl BidObserver for BidObserverMultiplexer {
+    fn block_submitted(
+        &self,
+        slot_data: &MevBoostSlotData,
+        sealed_block: &SealedBlock,
+        submit_block_request: &SubmitBlockRequest,
+        built_block_trace: &BuiltBlockTrace,
+        builder_name: String,
+        best_bid_value: alloy_primitives::U256,
+    ) {
+        for obs in &self.observers {
+            obs.block_submitted(
+                slot_data,
+                sealed_block,
+                submit_block_request,
+                built_block_trace,
+                builder_name.clone(),
+                best_bid_value,
+            );
+        }
+    }
+}

crates/rbuilder/src/live_builder/block_output/mod.rs

@@ -1,4 +1,5 @@
 pub mod bid_observer;
+pub mod bid_observer_multiplexer;
 pub mod bid_value_source;
 pub mod bidding;
 pub mod block_sealing_bidder_factory;

crates/rbuilder/src/live_builder/block_output/relay_submit.rs

@@ -332,9 +332,10 @@ async fn run_submit_to_relays_job(
         submission_span.in_scope(|| {
             // NOTE: we only notify normal submission here because they have the same contents but different pubkeys
             config.bid_observer.block_submitted(
-                block.sealed_block,
-                normal_signed_submission.submission,
-                block.trace,
+                &slot_data,
+                &block.sealed_block,
+                &normal_signed_submission.submission,
+                &block.trace,
                 builder_name,
                 bid_metadata.value.top_competitor_bid.unwrap_or_default(),
             );