Remove empty match arm during prefix check

[rust-lightning] / lightning-rapid-gossip-sync / src / processing.rs

diff --git a/lightning-rapid-gossip-sync/src/processing.rs b/lightning-rapid-gossip-sync/src/processing.rs
index 1a46ef587afad0ef28d90d95ead951e1d1f8f69e..cc32e3ace14ebf2ffd32d5e197ea47306fceb3c1 100644 (file)
--- a/lightning-rapid-gossip-sync/src/processing.rs
+++ b/lightning-rapid-gossip-sync/src/processing.rs
@@ -37,12 +37,9 @@ impl<NG: Deref<Target=NetworkGraph<L>>, L: Deref> RapidGossipSync<NG, L> where L
                let mut prefix = [0u8; 4];
                read_cursor.read_exact(&mut prefix)?;
 
-               match prefix {
-                       GOSSIP_PREFIX => {}
-                       _ => {
-                               return Err(DecodeError::UnknownVersion.into());
-                       }
-               };
+               if prefix != GOSSIP_PREFIX {
+                       return Err(DecodeError::UnknownVersion.into());
+               }
 
                let chain_hash: BlockHash = Readable::read(read_cursor)?;
                let latest_seen_timestamp: u32 = Readable::read(read_cursor)?;
@@ -534,4 +531,39 @@ mod tests {
                assert!(after.contains("619737530008010752"));
                assert!(after.contains("783241506229452801"));
        }
+
+       #[test]
+       pub fn update_fails_with_unknown_version() {
+               let unknown_version_input = vec![
+                       76, 68, 75, 2, 111, 226, 140, 10, 182, 241, 179, 114, 193, 166, 162, 70, 174, 99, 247,
+                       79, 147, 30, 131, 101, 225, 90, 8, 156, 104, 214, 25, 0, 0, 0, 0, 0, 97, 227, 98, 218,
+                       0, 0, 0, 4, 2, 22, 7, 207, 206, 25, 164, 197, 231, 230, 231, 56, 102, 61, 250, 251,
+                       187, 172, 38, 46, 79, 247, 108, 44, 155, 48, 219, 238, 252, 53, 192, 6, 67, 2, 36, 125,
+                       157, 176, 223, 175, 234, 116, 94, 248, 201, 225, 97, 235, 50, 47, 115, 172, 63, 136,
+                       88, 216, 115, 11, 111, 217, 114, 84, 116, 124, 231, 107, 2, 158, 1, 242, 121, 152, 106,
+                       204, 131, 186, 35, 93, 70, 216, 10, 237, 224, 183, 89, 95, 65, 3, 83, 185, 58, 138,
+                       181, 64, 187, 103, 127, 68, 50, 2, 201, 19, 17, 138, 136, 149, 185, 226, 156, 137, 175,
+                       110, 32, 237, 0, 217, 90, 31, 100, 228, 149, 46, 219, 175, 168, 77, 4, 143, 38, 128,
+                       76, 97, 0, 0, 0, 2, 0, 0, 255, 8, 153, 192, 0, 2, 27, 0, 0, 0, 1, 0, 0, 255, 2, 68,
+                       226, 0, 6, 11, 0, 1, 2, 3, 0, 0, 0, 4, 0, 40, 0, 0, 0, 0, 0, 0, 3, 232, 0, 0, 3, 232,
+                       0, 0, 0, 1, 0, 0, 0, 0, 29, 129, 25, 192, 255, 8, 153, 192, 0, 2, 27, 0, 0, 60, 0, 0,
+                       0, 0, 0, 0, 0, 1, 0, 0, 0, 100, 0, 0, 2, 224, 0, 0, 0, 0, 58, 85, 116, 216, 0, 29, 0,
+                       0, 0, 1, 0, 0, 0, 125, 0, 0, 0, 0, 58, 85, 116, 216, 255, 2, 68, 226, 0, 6, 11, 0, 1,
+                       0, 0, 1,
+               ];
+
+               let block_hash = genesis_block(Network::Bitcoin).block_hash();
+               let logger = TestLogger::new();
+               let network_graph = NetworkGraph::new(block_hash, &logger);
+               let rapid_sync = RapidGossipSync::new(&network_graph);
+               let update_result = rapid_sync.update_network_graph(&unknown_version_input[..]);
+
+               assert!(update_result.is_err());
+
+               if let Err(GraphSyncError::DecodeError(DecodeError::UnknownVersion)) = update_result {
+                       // this is the expected error type
+               } else {
+                       panic!("Unexpected update result: {:?}", update_result)
+               }
+       }
 }