Gloas lookup sync boilerplate (#9322)

Implements the boring boilerplate to send envelopes by root requests and process them. Pre-step to

- https://github.com/sigp/lighthouse/pull/9155


  


Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com>

beacon_node/network/src/sync/network_context/requests.rs

@@ -16,6 +16,9 @@ pub use data_columns_by_range::DataColumnsByRangeRequestItems;
 pub use data_columns_by_root::{
     DataColumnsByRootRequestItems, DataColumnsByRootSingleBlockRequest,
 };
+pub use payload_envelopes_by_root::{
+    PayloadEnvelopesByRootRequestItems, PayloadEnvelopesByRootSingleRequest,
+};
 
 use crate::metrics;
 
@@ -27,6 +30,7 @@ mod blocks_by_range;
 mod blocks_by_root;
 mod data_columns_by_range;
 mod data_columns_by_root;
+mod payload_envelopes_by_root;
 
 #[derive(Debug, PartialEq, Eq, IntoStaticStr)]
 pub enum LookupVerifyError {

beacon_node/network/src/sync/network_context/requests/payload_envelopes_by_root.rs

@@ -0,0 +1,54 @@
+use lighthouse_network::rpc::methods::PayloadEnvelopesByRootRequest;
+use std::sync::Arc;
+use types::{EthSpec, ForkContext, Hash256, SignedExecutionPayloadEnvelope};
+
+use super::{ActiveRequestItems, LookupVerifyError};
+
+#[derive(Debug, Clone)]
+pub struct PayloadEnvelopesByRootSingleRequest {
+    pub block_root: Hash256,
+}
+
+impl PayloadEnvelopesByRootSingleRequest {
+    pub fn into_request(
+        self,
+        fork_context: &ForkContext,
+    ) -> Result<PayloadEnvelopesByRootRequest, String> {
+        PayloadEnvelopesByRootRequest::new(vec![self.block_root], fork_context)
+    }
+}
+
+pub struct PayloadEnvelopesByRootRequestItems<E: EthSpec> {
+    request: PayloadEnvelopesByRootSingleRequest,
+    items: Vec<Arc<SignedExecutionPayloadEnvelope<E>>>,
+}
+
+impl<E: EthSpec> PayloadEnvelopesByRootRequestItems<E> {
+    pub fn new(request: PayloadEnvelopesByRootSingleRequest) -> Self {
+        Self {
+            request,
+            items: vec![],
+        }
+    }
+}
+
+impl<E: EthSpec> ActiveRequestItems for PayloadEnvelopesByRootRequestItems<E> {
+    type Item = Arc<SignedExecutionPayloadEnvelope<E>>;
+
+    /// Append a response to the single chunk request. We expect exactly one envelope per
+    /// block root. Returns `true` when the single expected item has been received.
+    fn add(&mut self, envelope: Self::Item) -> Result<bool, LookupVerifyError> {
+        let block_root = envelope.message.beacon_block_root;
+        if self.request.block_root != block_root {
+            return Err(LookupVerifyError::UnrequestedBlockRoot(block_root));
+        }
+
+        self.items.push(envelope);
+        // Always returns true, we expect a single envelope per block root
+        Ok(true)
+    }
+
+    fn consume(&mut self) -> Vec<Self::Item> {
+        std::mem::take(&mut self.items)
+    }
+}