more useful error message (paritytech#9014)

gasp-xyz · Jun 4, 2021 · 7d8a9b6 · 7d8a9b6
1 parent a57bc44
commit 7d8a9b6
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/client/finality-grandpa/src/import.rs b/client/finality-grandpa/src/import.rs
@@ -646,9 +646,10 @@ where
 		initial_sync: bool,
 	) -> Result<(), ConsensusError> {
 		if justification.0 != GRANDPA_ENGINE_ID {
-			return Err(ConsensusError::ClientImport(
-				"GRANDPA can only import GRANDPA Justifications.".into(),
-			));
+			return Err(ConsensusError::ClientImport(format!(
+				"Expected GRANDPA Justification, got {}.",
+				String::from_utf8_lossy(&justification.0)
+			)));
 		}
 
 		let justification = GrandpaJustification::decode_and_verify_finalizes(