Import target block body during warp sync (#12300)

* Receive and import target block body

* Request target block

* minor: wording

* Check for block body in the test

* Import target block justifications

* Fix: do not fail block validation if no justifications received

* Fix: import target blocks without justifications

Co-authored-by: arkpar <arkady.paronyan@gmail.com>

substrate/client/network/test/src/lib.rs

@@ -69,7 +69,7 @@ use sc_network_sync::{
 use sc_service::client::Client;
 use sp_blockchain::{
 	well_known_cache_keys::{self, Id as CacheKeyId},
-	HeaderBackend, Info as BlockchainInfo, Result as ClientResult,
+	Backend as BlockchainBackend, HeaderBackend, Info as BlockchainInfo, Result as ClientResult,
 };
 use sp_consensus::{
 	block_validation::{BlockAnnounceValidator, DefaultBlockAnnounceValidator},
@@ -540,6 +540,13 @@ where
 			.map(|backend| backend.blockchain().header(BlockId::hash(*hash)).unwrap().is_some())
 			.unwrap_or(false)
 	}
+
+	pub fn has_body(&self, hash: &H256) -> bool {
+		self.backend
+			.as_ref()
+			.map(|backend| backend.blockchain().body(BlockId::hash(*hash)).unwrap().is_some())
+			.unwrap_or(false)
+	}
 }
 
 pub trait BlockImportAdapterFull: