f - Rename NonDiscardingCache to ReadOnlyCache

lightning-block-sync/src/init.rs

@@ -48,7 +48,7 @@ pub async fn sync_listeners<B: BlockSource, C: Cache>(
 	let mut most_connected_blocks = Vec::new();
 	for (old_header, chain_listener) in chain_listeners_with_old_headers.drain(..) {
 		// Disconnect any stale blocks, but keep them in the cache for the next iteration.
-		let header_cache = &mut NonDiscardingCache(header_cache);
+		let header_cache = &mut ReadOnlyCache(header_cache);
 		let mut chain_notifier = ChainNotifier { header_cache };
 		let difference =
 			chain_notifier.find_difference(new_header, &old_header, &mut chain_poller).await?;
@@ -80,11 +80,13 @@ pub async fn sync_listeners<B: BlockSource, C: Cache>(
 	Ok(new_header)
 }
 
-/// A cache that won't discard any block headers. Used to prevent losing headers that are needed to
-/// disconnect blocks common to more than one listener.
-struct NonDiscardingCache<'a, C: Cache>(&'a mut C);
+/// A wrapper to make a cache read-only.
+///
+/// Used to prevent losing headers that may be needed to disconnect blocks common to more than one
+/// listener.
+struct ReadOnlyCache<'a, C: Cache>(&'a mut C);
 
-impl<'a, C: Cache> Cache for NonDiscardingCache<'a, C> {
+impl<'a, C: Cache> Cache for ReadOnlyCache<'a, C> {
 	fn look_up(&self, block_hash: &BlockHash) -> Option<&ValidatedBlockHeader> {
 		self.0.look_up(block_hash)
 	}