BEEFY and GRANDPA protocol names should use full genesis hash (#10974)

std::fmt::Display shows formats as reduced hash (e.g. 0xb0a8…dafe)

Use hex::encode to format full hash.

Signed-off-by: acatangiu <adrian@parity.io>

substrate/client/beefy/src/lib.rs

@@ -53,13 +53,13 @@ pub(crate) mod beefy_protocol_name {
 	/// Name of the notifications protocol used by BEEFY.
 	///
 	/// Must be registered towards the networking in order for BEEFY to properly function.
-	pub fn standard_name<Hash: std::fmt::Display>(
+	pub fn standard_name<Hash: AsRef<[u8]>>(
 		genesis_hash: &Hash,
 		chain_spec: &Box<dyn ChainSpec>,
 	) -> std::borrow::Cow<'static, str> {
 		let chain_prefix = match chain_spec.fork_id() {
-			Some(fork_id) => format!("/{}/{}", genesis_hash, fork_id),
-			None => format!("/{}", genesis_hash),
+			Some(fork_id) => format!("/{}/{}", hex::encode(genesis_hash), fork_id),
+			None => format!("/{}", hex::encode(genesis_hash)),
 		};
 		format!("{}{}", chain_prefix, NAME).into()
 	}
@@ -190,3 +190,48 @@ where
 
 	worker.run().await
 }
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use sc_chain_spec::{ChainSpec, GenericChainSpec};
+	use serde::{Deserialize, Serialize};
+	use sp_core::H256;
+	use sp_runtime::{BuildStorage, Storage};
+
+	#[derive(Debug, Serialize, Deserialize)]
+	struct Genesis(std::collections::BTreeMap<String, String>);
+	impl BuildStorage for Genesis {
+		fn assimilate_storage(&self, storage: &mut Storage) -> Result<(), String> {
+			storage.top.extend(
+				self.0.iter().map(|(a, b)| (a.clone().into_bytes(), b.clone().into_bytes())),
+			);
+			Ok(())
+		}
+	}
+
+	#[test]
+	fn beefy_protocol_name() {
+		let chain_spec = GenericChainSpec::<Genesis>::from_json_file(std::path::PathBuf::from(
+			"../chain-spec/res/chain_spec.json",
+		))
+		.unwrap()
+		.cloned_box();
+
+		// Create protocol name using random genesis hash.
+		let genesis_hash = H256::random();
+		let expected = format!("/{}/beefy/1", hex::encode(genesis_hash));
+		let proto_name = beefy_protocol_name::standard_name(&genesis_hash, &chain_spec);
+		assert_eq!(proto_name.to_string(), expected);
+
+		// Create protocol name using hardcoded genesis hash. Verify exact representation.
+		let genesis_hash = [
+			50, 4, 60, 123, 58, 106, 216, 246, 194, 188, 139, 193, 33, 212, 202, 171, 9, 55, 123,
+			94, 8, 43, 12, 251, 187, 57, 173, 19, 188, 74, 205, 147,
+		];
+		let expected =
+			"/32043c7b3a6ad8f6c2bc8bc121d4caab09377b5e082b0cfbbb39ad13bc4acd93/beefy/1".to_string();
+		let proto_name = beefy_protocol_name::standard_name(&genesis_hash, &chain_spec);
+		assert_eq!(proto_name.to_string(), expected);
+	}
+}