X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fchain%2Fchaininterface.rs;h=814193af0033a21987757b2d1258bd30b988feda;hb=27079e04d7b542058e48cafaf5c2e7114b3b8e15;hp=3a2e69cd1cbe2bad22b8a06e58802fbe8a9f2dc9;hpb=425e4adbf23e9b67ea03457375812f758e95c9e4;p=rust-lightning

diff --git a/lightning/src/chain/chaininterface.rs b/lightning/src/chain/chaininterface.rs
index 3a2e69cd..814193af 100644
--- a/lightning/src/chain/chaininterface.rs
+++ b/lightning/src/chain/chaininterface.rs
@@ -9,8 +9,8 @@ use bitcoin::blockdata::transaction::Transaction;
 use bitcoin::blockdata::script::Script;
 use bitcoin::blockdata::constants::genesis_block;
 use bitcoin::util::hash::BitcoinHash;
-use bitcoin_hashes::sha256d::Hash as Sha256dHash;
 use bitcoin::network::constants::Network;
+use bitcoin::hash_types::{Txid, BlockHash};
 
 use util::logger::Logger;
 
@@ -19,8 +19,10 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 use std::collections::HashSet;
 use std::ops::Deref;
 use std::marker::PhantomData;
+use std::ptr;
 
 /// Used to give chain error details upstream
+#[derive(Clone)]
 pub enum ChainError {
 	/// Client doesn't support UTXO lookup (but the chain hash matches our genesis block hash)
 	NotSupported,
@@ -38,11 +40,11 @@ pub enum ChainError {
 /// events).
 pub trait ChainWatchInterface: Sync + Send {
 	/// Provides a txid/random-scriptPubKey-in-the-tx which much be watched for.
-	fn install_watch_tx(&self, txid: &Sha256dHash, script_pub_key: &Script);
+	fn install_watch_tx(&self, txid: &Txid, script_pub_key: &Script);
 
 	/// Provides an outpoint which must be watched for, providing any transactions which spend the
 	/// given outpoint.
-	fn install_watch_outpoint(&self, outpoint: (Sha256dHash, u32), out_script: &Script);
+	fn install_watch_outpoint(&self, outpoint: (Txid, u32), out_script: &Script);
 
 	/// Indicates that a listener needs to see all transactions.
 	fn watch_all_txn(&self);
@@ -51,7 +53,7 @@ pub trait ChainWatchInterface: Sync + Send {
 	/// 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
 	/// final two the output within the transaction.
-	fn get_chain_utxo(&self, genesis_hash: Sha256dHash, unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError>;
+	fn get_chain_utxo(&self, genesis_hash: BlockHash, unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError>;
 
 	/// Gets the list of transactions and transaction indices that the ChainWatchInterface is
 	/// watching for.
@@ -72,11 +74,16 @@ pub trait BroadcasterInterface: Sync + Send {
 /// A trait indicating a desire to listen for events from the chain
 pub trait ChainListener: Sync + Send {
 	/// Notifies a listener that a block was connected.
-	/// Note that if a new transaction/outpoint is watched during a block_connected call, the block
-	/// *must* be re-scanned with the new transaction/outpoints and block_connected should be
-	/// called again with the same header and (at least) the new transactions.
 	///
-	/// Note that if non-new transaction/outpoints may be registered during a call, a second call
+	/// The txn_matched array should be set to references to transactions which matched the
+	/// relevant installed watch outpoints/txn, or the full set of transactions in the block.
+	///
+	/// Note that if txn_matched includes only matched transactions, and a new
+	/// transaction/outpoint is watched during a block_connected call, the block *must* be
+	/// re-scanned with the new transaction/outpoints and block_connected should be called
+	/// again with the same header and (at least) the new transactions.
+	///
+	/// Note that if non-new transaction/outpoints are be registered during a call, a second call
 	/// *must not* happen.
 	///
 	/// This also means those counting confirmations using block_connected callbacks should watch
@@ -121,17 +128,18 @@ pub trait FeeEstimator: Sync + Send {
 pub const MIN_RELAY_FEE_SAT_PER_1000_WEIGHT: u64 = 4000;
 
 /// Utility for tracking registered txn/outpoints and checking for matches
+#[cfg_attr(test, derive(PartialEq))]
 pub struct ChainWatchedUtil {
 	watch_all: bool,
 
 	// We are more conservative in matching during testing to ensure everything matches *exactly*,
 	// even though during normal runtime we take more optimized match approaches...
 	#[cfg(test)]
-	watched_txn: HashSet<(Sha256dHash, Script)>,
+	watched_txn: HashSet<(Txid, Script)>,
 	#[cfg(not(test))]
 	watched_txn: HashSet<Script>,
 
-	watched_outpoints: HashSet<(Sha256dHash, u32)>,
+	watched_outpoints: HashSet<(Txid, u32)>,
 }
 
 impl ChainWatchedUtil {
@@ -146,7 +154,7 @@ impl ChainWatchedUtil {
 
 	/// Registers a tx for monitoring, returning true if it was a new tx and false if we'd already
 	/// been watching for it.
-	pub fn register_tx(&mut self, txid: &Sha256dHash, script_pub_key: &Script) -> bool {
+	pub fn register_tx(&mut self, txid: &Txid, script_pub_key: &Script) -> bool {
 		if self.watch_all { return false; }
 		#[cfg(test)]
 		{
@@ -161,7 +169,7 @@ impl ChainWatchedUtil {
 
 	/// Registers an outpoint for monitoring, returning true if it was a new outpoint and false if
 	/// we'd already been watching for it
-	pub fn register_outpoint(&mut self, outpoint: (Sha256dHash, u32), _script_pub_key: &Script) -> bool {
+	pub fn register_outpoint(&mut self, outpoint: (Txid, u32), _script_pub_key: &Script) -> bool {
 		if self.watch_all { return false; }
 		self.watched_outpoints.insert(outpoint)
 	}
@@ -247,11 +255,22 @@ impl<'a, CL: Deref<Target = ChainListener + 'a> + 'a> BlockNotifier<'a, CL> {
 	}
 
 	/// Register the given listener to receive events.
-	// TODO: unregister
 	pub fn register_listener(&self, listener: CL) {
 		let mut vec = self.listeners.lock().unwrap();
 		vec.push(listener);
 	}
+	/// Unregister the given listener to no longer
+	/// receive events.
+	///
+	/// If the same listener is registered multiple times, unregistering
+	/// will remove ALL occurrences of that listener. Comparison is done using
+	/// the pointer returned by the Deref trait implementation.
+	pub fn unregister_listener(&self, listener: CL) {
+		let mut vec = self.listeners.lock().unwrap();
+		// item is a ref to an abstract thing that dereferences to a ChainListener,
+		// so dereference it twice to get the ChainListener itself
+		vec.retain(|item | !ptr::eq(&(**item), &(*listener)));
+	}
 
 	/// Notify listeners that a block was connected given a full, unfiltered block.
 	///
@@ -281,7 +300,6 @@ impl<'a, CL: Deref<Target = ChainListener + 'a> + 'a> BlockNotifier<'a, CL> {
 		return last_seen != self.chain_monitor.reentered();
 	}
 
-
 	/// Notify listeners that a block was disconnected.
 	pub fn block_disconnected(&self, header: &BlockHeader, disconnected_height: u32) {
 		let listeners = self.listeners.lock().unwrap();
@@ -289,7 +307,6 @@ impl<'a, CL: Deref<Target = ChainListener + 'a> + 'a> BlockNotifier<'a, CL> {
 			listener.block_disconnected(&header, disconnected_height);
 		}
 	}
-
 }
 
 /// Utility to capture some common parts of ChainWatchInterface implementors.
@@ -302,16 +319,27 @@ pub struct ChainWatchInterfaceUtil {
 	logger: Arc<Logger>,
 }
 
+// We only expose PartialEq in test since its somewhat unclear exactly what it should do and we're
+// only comparing a subset of fields (essentially just checking that the set of things we're
+// watching is the same).
+#[cfg(test)]
+impl PartialEq for ChainWatchInterfaceUtil {
+	fn eq(&self, o: &Self) -> bool {
+		self.network == o.network &&
+		*self.watched.lock().unwrap() == *o.watched.lock().unwrap()
+	}
+}
+
 /// Register listener
 impl ChainWatchInterface for ChainWatchInterfaceUtil {
-	fn install_watch_tx(&self, txid: &Sha256dHash, script_pub_key: &Script) {
+	fn install_watch_tx(&self, txid: &Txid, script_pub_key: &Script) {
 		let mut watched = self.watched.lock().unwrap();
 		if watched.register_tx(txid, script_pub_key) {
 			self.reentered.fetch_add(1, Ordering::Relaxed);
 		}
 	}
 
-	fn install_watch_outpoint(&self, outpoint: (Sha256dHash, u32), out_script: &Script) {
+	fn install_watch_outpoint(&self, outpoint: (Txid, u32), out_script: &Script) {
 		let mut watched = self.watched.lock().unwrap();
 		if watched.register_outpoint(outpoint, out_script) {
 			self.reentered.fetch_add(1, Ordering::Relaxed);
@@ -325,7 +353,7 @@ impl ChainWatchInterface for ChainWatchInterfaceUtil {
 		}
 	}
 
-	fn get_chain_utxo(&self, genesis_hash: Sha256dHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
+	fn get_chain_utxo(&self, genesis_hash: BlockHash, _unspent_tx_output_identifier: u64) -> Result<(Script, u64), ChainError> {
 		if genesis_hash != genesis_block(self.network).header.bitcoin_hash() {
 			return Err(ChainError::NotWatched);
 		}
@@ -363,7 +391,6 @@ impl ChainWatchInterfaceUtil {
 		}
 	}
 
-
 	/// Checks if a given transaction matches the current filter.
 	pub fn does_match_tx(&self, tx: &Transaction) -> bool {
 		let watched = self.watched.lock().unwrap();
@@ -374,3 +401,80 @@ impl ChainWatchInterfaceUtil {
 		watched.does_match_tx(tx)
 	}
 }
+
+#[cfg(test)]
+mod tests {
+	use ln::functional_test_utils::{create_chanmon_cfgs, create_node_cfgs};
+	use super::{BlockNotifier, ChainListener};
+	use std::ptr;
+
+	#[test]
+	fn register_listener_test() {
+		let chanmon_cfgs = create_chanmon_cfgs(1);
+		let node_cfgs = create_node_cfgs(1, &chanmon_cfgs);
+		let block_notifier = BlockNotifier::new(node_cfgs[0].chain_monitor.clone());
+		assert_eq!(block_notifier.listeners.lock().unwrap().len(), 0);
+		let listener = &node_cfgs[0].chan_monitor.simple_monitor as &ChainListener;
+		block_notifier.register_listener(listener);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 1);
+		let item = vec.first().clone().unwrap();
+		assert!(ptr::eq(&(**item), &(*listener)));
+	}
+
+	#[test]
+	fn unregister_single_listener_test() {
+		let chanmon_cfgs = create_chanmon_cfgs(2);
+		let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+		let block_notifier = BlockNotifier::new(node_cfgs[0].chain_monitor.clone());
+		let listener1 = &node_cfgs[0].chan_monitor.simple_monitor as &ChainListener;
+		let listener2 = &node_cfgs[1].chan_monitor.simple_monitor as &ChainListener;
+		block_notifier.register_listener(listener1);
+		block_notifier.register_listener(listener2);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 2);
+		drop(vec);
+		block_notifier.unregister_listener(listener1);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 1);
+		let item = vec.first().clone().unwrap();
+		assert!(ptr::eq(&(**item), &(*listener2)));
+	}
+
+	#[test]
+	fn unregister_single_listener_ref_test() {
+		let chanmon_cfgs = create_chanmon_cfgs(2);
+		let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+		let block_notifier = BlockNotifier::new(node_cfgs[0].chain_monitor.clone());
+		block_notifier.register_listener(&node_cfgs[0].chan_monitor.simple_monitor as &ChainListener);
+		block_notifier.register_listener(&node_cfgs[1].chan_monitor.simple_monitor as &ChainListener);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 2);
+		drop(vec);
+		block_notifier.unregister_listener(&node_cfgs[0].chan_monitor.simple_monitor);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 1);
+		let item = vec.first().clone().unwrap();
+		assert!(ptr::eq(&(**item), &(*&node_cfgs[1].chan_monitor.simple_monitor)));
+	}
+
+	#[test]
+	fn unregister_multiple_of_the_same_listeners_test() {
+		let chanmon_cfgs = create_chanmon_cfgs(2);
+		let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+		let block_notifier = BlockNotifier::new(node_cfgs[0].chain_monitor.clone());
+		let listener1 = &node_cfgs[0].chan_monitor.simple_monitor as &ChainListener;
+		let listener2 = &node_cfgs[1].chan_monitor.simple_monitor as &ChainListener;
+		block_notifier.register_listener(listener1);
+		block_notifier.register_listener(listener1);
+		block_notifier.register_listener(listener2);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 3);
+		drop(vec);
+		block_notifier.unregister_listener(listener1);
+		let vec = block_notifier.listeners.lock().unwrap();
+		assert_eq!(vec.len(), 1);
+		let item = vec.first().clone().unwrap();
+		assert!(ptr::eq(&(**item), &(*listener2)));
+	}
+}