Implement PeerDAS RPC handlers (#6237)

* Implement PeerDAS RPC handlers

* use terminate_response_stream

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into peerdas-network-rpc-handler

* cargo fmt

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -1155,6 +1155,25 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             .map_or_else(|| self.get_blobs(block_root), Ok)
     }
 
+    pub fn get_data_column_checking_all_caches(
+        &self,
+        block_root: Hash256,
+        index: ColumnIndex,
+    ) -> Result<Option<Arc<DataColumnSidecar<T::EthSpec>>>, Error> {
+        if let Some(column) = self
+            .data_availability_checker
+            .get_data_column(&DataColumnIdentifier { block_root, index })?
+        {
+            return Ok(Some(column));
+        }
+
+        if let Some(columns) = self.early_attester_cache.get_data_columns(block_root) {
+            return Ok(columns.iter().find(|c| c.index == index).cloned());
+        }
+
+        self.get_data_column(&block_root, &index)
+    }
+
     /// Returns the block at the given root, if any.
     ///
     /// ## Errors
@@ -1230,6 +1249,18 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         }
     }
 
+    /// Returns the data columns at the given root, if any.
+    ///
+    /// ## Errors
+    /// May return a database error.
+    pub fn get_data_column(
+        &self,
+        block_root: &Hash256,
+        column_index: &ColumnIndex,
+    ) -> Result<Option<Arc<DataColumnSidecar<T::EthSpec>>>, Error> {
+        Ok(self.store.get_data_column(block_root, column_index)?)
+    }
+
     pub fn get_blinded_block(
         &self,
         block_root: &Hash256,

beacon_node/beacon_chain/src/data_availability_checker.rs

@@ -15,8 +15,8 @@ use std::time::Duration;
 use task_executor::TaskExecutor;
 use types::blob_sidecar::{BlobIdentifier, BlobSidecar, FixedBlobSidecarList};
 use types::{
-    BlobSidecarList, ChainSpec, DataColumnSidecarList, Epoch, EthSpec, Hash256, SignedBeaconBlock,
-    Slot,
+    BlobSidecarList, ChainSpec, DataColumnIdentifier, DataColumnSidecar, DataColumnSidecarList,
+    Epoch, EthSpec, Hash256, SignedBeaconBlock, Slot,
 };
 
 mod error;
@@ -173,6 +173,14 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
         self.availability_cache.peek_blob(blob_id)
     }
 
+    /// Get a data column from the availability cache.
+    pub fn get_data_column(
+        &self,
+        data_column_id: &DataColumnIdentifier,
+    ) -> Result<Option<Arc<DataColumnSidecar<T::EthSpec>>>, AvailabilityCheckError> {
+        self.availability_cache.peek_data_column(data_column_id)
+    }
+
     /// Put a list of blobs received via RPC into the availability cache. This performs KZG
     /// verification on the blobs in the list.
     pub fn put_rpc_blobs(

beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs

@@ -13,7 +13,10 @@ use ssz_types::{FixedVector, VariableList};
 use std::num::NonZeroUsize;
 use std::sync::Arc;
 use types::blob_sidecar::BlobIdentifier;
-use types::{BlobSidecar, ChainSpec, ColumnIndex, Epoch, EthSpec, Hash256, SignedBeaconBlock};
+use types::{
+    BlobSidecar, ChainSpec, ColumnIndex, DataColumnIdentifier, DataColumnSidecar, Epoch, EthSpec,
+    Hash256, SignedBeaconBlock,
+};
 
 /// This represents the components of a partially available block
 ///
@@ -389,6 +392,22 @@ impl<T: BeaconChainTypes> DataAvailabilityCheckerInner<T> {
         }
     }
 
+    /// Fetch a data column from the cache without affecting the LRU ordering
+    pub fn peek_data_column(
+        &self,
+        data_column_id: &DataColumnIdentifier,
+    ) -> Result<Option<Arc<DataColumnSidecar<T::EthSpec>>>, AvailabilityCheckError> {
+        if let Some(pending_components) = self.critical.read().peek(&data_column_id.block_root) {
+            Ok(pending_components
+                .verified_data_columns
+                .iter()
+                .find(|data_column| data_column.as_data_column().index == data_column_id.index)
+                .map(|data_column| data_column.clone_arc()))
+        } else {
+            Ok(None)
+        }
+    }
+
     pub fn peek_pending_components<R, F: FnOnce(Option<&PendingComponents<T::EthSpec>>) -> R>(
         &self,
         block_root: &Hash256,

beacon_node/beacon_chain/src/data_column_verification.rs

@@ -254,6 +254,9 @@ impl<E: EthSpec> KzgVerifiedCustodyDataColumn<E> {
     pub fn as_data_column(&self) -> &DataColumnSidecar<E> {
         &self.data
     }
+    pub fn clone_arc(&self) -> Arc<DataColumnSidecar<E>> {
+        self.data.clone()
+    }
 }
 
 /// Complete kzg verification for a `DataColumnSidecar`.