chaininterface: remove unused listeners field and method

Author: valentinewallace

src/chain/chaininterface.rs

@@ -45,11 +45,6 @@ pub trait ChainWatchInterface: Sync + Send {
 	/// Indicates that a listener needs to see all transactions.
 	fn watch_all_txn(&self);
 
-	/// Register the given listener to receive events. Only a weak pointer is provided and the
-	/// registration should be freed once that pointer expires.
-	fn register_listener(&self, listener: Weak<ChainListener>);
-	//TODO: unregister
-
 	/// Gets the script and value in satoshis for a given unspent transaction output given a
 	/// short_channel_id (aka unspent_tx_output_identier). For BTC/tBTC channels the top three
 	/// bytes are the block height, the next 3 the transaction index within the block, and the
@@ -282,7 +277,6 @@ impl BlockNotifier {
 pub struct ChainWatchInterfaceUtil {
 	network: Network,
 	watched: Mutex<ChainWatchedUtil>,
-	listeners: Mutex<Vec<Weak<ChainListener>>>,
 	reentered: AtomicUsize,
 	logger: Arc<Logger>,
 }
@@ -310,11 +304,6 @@ impl ChainWatchInterface for ChainWatchInterfaceUtil {
 		}
 	}
 
-	fn register_listener(&self, listener: Weak<ChainListener>) {
-		let mut vec = self.listeners.lock().unwrap();
-		vec.push(listener);
-	}
-
 	fn get_chain_utxo(&self, genesis_hash: Sha256dHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
 		if genesis_hash != genesis_block(self.network).header.bitcoin_hash() {
 			return Err(ChainError::NotWatched);
@@ -348,7 +337,6 @@ impl ChainWatchInterfaceUtil {
 		ChainWatchInterfaceUtil {
 			network: network,
 			watched: Mutex::new(ChainWatchedUtil::new()),
-			listeners: Mutex::new(Vec::new()),
 			reentered: AtomicUsize::new(1),
 			logger: logger,
 		}