From 4ef4c7ddd4640729f0077349455c10d40d8353f0 Mon Sep 17 00:00:00 2001
From: Daniel Knopik <daniel@dknopik.de>
Date: Tue, 28 Apr 2026 17:06:45 +0200
Subject: [PATCH] some progress around reconstruction

---
 .../src/pending_payload_cache/mod.rs          | 16 +++-----
 .../pending_components.rs                     | 40 ++++++++++++++-----
 2 files changed, 36 insertions(+), 20 deletions(-)

diff --git a/beacon_node/beacon_chain/src/pending_payload_cache/mod.rs b/beacon_node/beacon_chain/src/pending_payload_cache/mod.rs
index fde5c98327..44dfa0c895 100644
--- a/beacon_node/beacon_chain/src/pending_payload_cache/mod.rs
+++ b/beacon_node/beacon_chain/src/pending_payload_cache/mod.rs
@@ -470,7 +470,9 @@ impl<T: BeaconChainTypes> PendingPayloadCache<T> {
         pending_components: MappedRwLockReadGuard<'_, PendingComponents<T::EthSpec>>,
         num_expected_columns: usize,
     ) -> Result<Availability<T::EthSpec>, AvailabilityCheckError> {
-        if let Some(available_envelope) = pending_components.make_available(num_expected_columns)? {
+        if let Some(available_envelope) =
+            pending_components.make_available(block_root, num_expected_columns)?
+        {
             // Explicitly drop read lock before acquiring write lock
             drop(pending_components);
             if let Some(components) = self.availability_cache.write().get_mut(&block_root) {
@@ -534,23 +536,17 @@ impl<T: BeaconChainTypes> PendingPayloadCache<T> {
             return ReconstructColumnsDecision::No("block already imported");
         };
 
-        let Some(epoch) = pending_components
-            .verified_data_columns
-            .first()
-            .map(|c| c.as_data_column().epoch())
-        else {
-            return ReconstructColumnsDecision::No("not enough columns");
-        };
+        let epoch = pending_components.epoch();
 
         let total_column_count = T::EthSpec::number_of_columns();
         let sampling_column_count = self
             .custody_context
             .num_of_data_columns_to_sample(epoch, &self.spec);
-        let received_column_count = pending_components.verified_data_columns.len();
 
         if pending_components.reconstruction_started {
             return ReconstructColumnsDecision::No("already started");
         }
+        let received_column_count = pending_components.num_completed_columns();
         if received_column_count >= sampling_column_count {
             return ReconstructColumnsDecision::No("all sampling columns received");
         }
@@ -559,7 +555,7 @@ impl<T: BeaconChainTypes> PendingPayloadCache<T> {
         }
 
         pending_components.reconstruction_started = true;
-        ReconstructColumnsDecision::Yes(pending_components.verified_data_columns.clone())
+        ReconstructColumnsDecision::Yes(pending_components.get_cached_data_columns(block_root))
     }
 
     /// This could mean some invalid data columns made it through to the `DataAvailabilityChecker`.
diff --git a/beacon_node/beacon_chain/src/pending_payload_cache/pending_components.rs b/beacon_node/beacon_chain/src/pending_payload_cache/pending_components.rs
index 758a1705f3..3b09c10fe3 100644
--- a/beacon_node/beacon_chain/src/pending_payload_cache/pending_components.rs
+++ b/beacon_node/beacon_chain/src/pending_payload_cache/pending_components.rs
@@ -30,6 +30,16 @@ pub struct PendingComponents<E: EthSpec> {
 }
 
 impl<E: EthSpec> PendingComponents<E> {
+    /// Returns the completed custody columns
+    pub fn get_cached_data_columns(&self, block_root: Hash256) -> Vec<Arc<DataColumnSidecar<E>>> {
+        self.verified_data_columns
+            .iter()
+            .filter_map(|(col_idx, col)| {
+                col.try_to_sidecar(*col_idx, self.slot, block_root, self.num_blobs_expected)
+            })
+            .collect()
+    }
+
     /// Returns the indices of cached custody columns
     pub fn get_cached_data_columns_indices(&self) -> Vec<ColumnIndex> {
         self.verified_data_columns
@@ -81,6 +91,13 @@ impl<E: EthSpec> PendingComponents<E> {
         self.num_blobs_expected
     }
 
+    pub fn num_completed_columns(&self) -> usize {
+        self.verified_data_columns
+            .iter()
+            .filter_map(|(_, col)| col.is_complete(self.num_blobs_expected).then_some(()))
+            .count()
+    }
+
     /// Returns `Some` if the envelope and all required data columns have been received.
     pub fn make_available(
         &self,
@@ -104,14 +121,7 @@ impl<E: EthSpec> PendingComponents<E> {
             });
             vec![]
         } else {
-            let data_columns: Vec<_> = self
-                .verified_data_columns
-                .iter()
-                .filter_map(|(col_idx, col)| {
-                    col.try_to_sidecar(*col_idx, self.slot, block_hash, self.num_blobs_expected)
-                })
-                .collect();
-            let num_completed_columns = data_columns.len();
+            let num_completed_columns = self.num_completed_columns();
             match num_completed_columns.cmp(&num_expected_columns) {
                 Ordering::Greater => {
                     // Should never happen
@@ -124,7 +134,17 @@ impl<E: EthSpec> PendingComponents<E> {
                         debug!("All data columns received, data is available");
                     });
 
-                    data_columns
+                    self.verified_data_columns
+                        .iter()
+                        .filter_map(|(col_idx, col)| {
+                            col.try_to_sidecar(
+                                *col_idx,
+                                self.slot,
+                                block_hash,
+                                self.num_blobs_expected,
+                            )
+                        })
+                        .collect()
                 }
                 Ordering::Less => {
                     // Not enough data columns received yet
@@ -187,7 +207,7 @@ impl<E: EthSpec> PendingComponents<E> {
 // the current usage, as it's deconstructed immediately.
 #[allow(clippy::large_enum_variant)]
 pub(crate) enum ReconstructColumnsDecision<E: EthSpec> {
-    Yes(Vec<KzgVerifiedCustodyDataColumn<E>>),
+    Yes(Vec<Arc<DataColumnSidecar<E>>>),
     No(&'static str),
 }