clean up and improvements

beacon_node/network/src/sync/block_sidecar_coupling.rs

@@ -5,11 +5,6 @@ use types::{
     SignedBeaconBlockAndBlobsSidecar,
 };
 
-struct ReceivedData<T: EthSpec> {
-    block: Option<Arc<SignedBeaconBlock<T>>>,
-    blob: Option<Arc<BlobsSidecar<T>>>,
-}
-
 #[derive(Debug, Default)]
 pub struct BlockBlobRequestInfo<T: EthSpec> {
     /// Blocks we have received awaiting for their corresponding sidecar.
@@ -17,84 +12,68 @@ pub struct BlockBlobRequestInfo<T: EthSpec> {
     /// Sidecars we have received awaiting for their corresponding block.
     accumulated_sidecars: VecDeque<Arc<BlobsSidecar<T>>>,
     /// Whether the individual RPC request for blocks is finished or not.
-    is_blocks_rpc_finished: bool,
+    is_blocks_stream_terminated: bool,
     /// Whether the individual RPC request for sidecars is finished or not.
-    is_sidecar_rpc_finished: bool,
+    is_sidecars_stream_terminated: bool,
 }
 
 impl<T: EthSpec> BlockBlobRequestInfo<T> {
     pub fn add_block_response(&mut self, maybe_block: Option<Arc<SignedBeaconBlock<T>>>) {
         match maybe_block {
             Some(block) => self.accumulated_blocks.push_back(block),
-            None => self.is_blocks_rpc_finished = true,
+            None => self.is_blocks_stream_terminated = true,
         }
     }
 
     pub fn add_sidecar_response(&mut self, maybe_sidecar: Option<Arc<BlobsSidecar<T>>>) {
         match maybe_sidecar {
             Some(sidecar) => self.accumulated_sidecars.push_back(sidecar),
-            None => self.is_sidecar_rpc_finished = true,
+            None => self.is_sidecars_stream_terminated = true,
         }
     }
 
     pub fn into_responses(self) -> Result<Vec<BlockWrapper<T>>, &'static str> {
         let BlockBlobRequestInfo {
             accumulated_blocks,
-            accumulated_sidecars,
+            mut accumulated_sidecars,
             ..
         } = self;
 
-        // Create the storage for our pairs.
-        let mut pairs = Vec::with_capacity(accumulated_blocks.len());
-
-        // ASSUMPTION: There can't be more more blobs than blocks. i.e. sending any block (empty
+        // ASSUMPTION: There can't be more more blobs than blocks. i.e. sending any blob (empty
         // included) for a skipped slot is not permitted.
-        for sidecar in accumulated_sidecars {
-            let blob_slot = sidecar.beacon_block_slot;
-            // First queue any blocks that might not have a blob.
-            while let Some(block) = {
-                // We identify those if their slot is less than the current blob's slot.
-                match accumulated_blocks.front() {
-                    Some(borrowed_block) if borrowed_block.slot() < blob_slot => {
-                        accumulated_blocks.pop_front()
-                    }
-                    Some(_) => None,
-                    None => {
-                        // We received a blob and ran out of blocks. This is a peer error
-                        return Err("Blob without more blobs to pair with returned by peer");
-                    }
+        let pairs = accumulated_blocks
+            .into_iter()
+            .map(|beacon_block| {
+                if accumulated_sidecars
+                    .front()
+                    .map(|sidecar| sidecar.beacon_block_slot == beacon_block.slot())
+                    .unwrap_or(false)
+                {
+                    let blobs_sidecar =
+                        accumulated_sidecars.pop_front().ok_or("missing sidecar")?;
+                    Ok(BlockWrapper::BlockAndBlob {
+                        block_sidecar_pair: SignedBeaconBlockAndBlobsSidecar {
+                            beacon_block,
+                            blobs_sidecar,
+                        },
+                    })
+                } else {
+                    Ok(BlockWrapper::Block {
+                        block: beacon_block,
+                    })
                 }
-            } {
-                pairs.push(BlockWrapper::Block { block })
-            }
+            })
+            .collect::<Result<Vec<_>, _>>();
 
-            // The next block must be present and must match the blob's slot
-            let next_block = accumulated_blocks
-                .pop_front()
-                .expect("If block stream ended, an error was previously returned");
-            if next_block.slot() != blob_slot {
-                // We verified that the slot of the block is not less than the slot of the blob (it
-                // would have been returned before). It's also not equal, so this block is ahead
-                // than the blob. This means the blob is not paired.
-                return Err("Blob without a matching block returned by peer");
-            }
-            pairs.push(BlockWrapper::BlockAndBlob {
-                block_sidecar_pair: SignedBeaconBlockAndBlobsSidecar {
-                    beacon_block: next_block,
-                    blobs_sidecar: sidecar,
-                },
-            });
+        // if accumulated sidecars is not empty, throw an error.
+        if !accumulated_sidecars.is_empty() {
+            return Err("Received more sidecars than blocks");
         }
 
-        // Every remaining block does not have a blob
-        for block in accumulated_blocks {
-            pairs.push(BlockWrapper::Block { block })
-        }
-
-        Ok(pairs)
+        pairs
     }
 
     pub fn is_finished(&self) -> bool {
-        self.is_blocks_rpc_finished && self.is_sidecar_rpc_finished
+        self.is_blocks_stream_terminated && self.is_sidecars_stream_terminated
     }
 }

beacon_node/network/src/sync/network_context.rs

@@ -278,11 +278,9 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
         is_stream_terminator: bool,
     ) -> Option<(ChainId, BatchId)> {
         if is_stream_terminator {
-            self.range_requests
-                .remove(&request_id)
-                .map(|(chain_id, batch_id)| (chain_id, batch_id))
+            self.range_requests.remove(&request_id)
         } else {
-            self.range_requests.get(&request_id).cloned()
+            self.range_requests.get(&request_id).copied()
         }
     }
 
@@ -354,7 +352,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
                 .remove(&request_id)
                 .map(|batch_id| batch_id)
         } else {
-            self.backfill_requests.get(&request_id).cloned()
+            self.backfill_requests.get(&request_id).copied()
         }
     }