use util::logger::Logger;
-use std::sync::{Mutex,Weak,MutexGuard,Arc};
+use std::sync::{Mutex, MutexGuard, Arc};
use std::sync::atomic::{AtomicUsize, Ordering};
use std::collections::HashSet;
+use std::ops::Deref;
+use std::marker::PhantomData;
/// Used to give chain error details upstream
pub enum ChainError {
/// 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
fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u64;
}
+/// Minimum relay fee as required by bitcoin network mempool policy.
+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,
}
}
+/// BlockNotifierArc is useful when you need a BlockNotifier that points to ChainListeners with
+/// static lifetimes, e.g. when you're using lightning-net-tokio (since tokio::spawn requires
+/// parameters with static lifetimes). Other times you can afford a reference, which is more
+/// efficient, in which case BlockNotifierRef is a more appropriate type. Defining these type
+/// aliases prevents issues such as overly long function definitions.
+pub type BlockNotifierArc = Arc<BlockNotifier<'static, Arc<ChainListener>>>;
+
+/// BlockNotifierRef is useful when you want a BlockNotifier that points to ChainListeners
+/// with nonstatic lifetimes. This is useful for when static lifetimes are not needed. Nonstatic
+/// lifetimes are more efficient but less flexible, and should be used by default unless static
+/// lifetimes are required, e.g. when you're using lightning-net-tokio (since tokio::spawn
+/// requires parameters with static lifetimes), in which case BlockNotifierArc is a more
+/// appropriate type. Defining these type aliases for common usages prevents issues such as
+/// overly long function definitions.
+pub type BlockNotifierRef<'a> = BlockNotifier<'a, &'a ChainListener>;
+
/// Utility for notifying listeners about new blocks, and handling block rescans if new watch
/// data is registered.
-pub struct BlockNotifier<'a> {
- listeners: Mutex<Vec<Weak<ChainListener + 'a>>>, //TODO(vmw): try removing Weak
+///
+/// Rather than using a plain BlockNotifier, it is preferable to use either a BlockNotifierArc
+/// or a BlockNotifierRef for conciseness. See their documentation for more details, but essentially
+/// you should default to using a BlockNotifierRef, and use a BlockNotifierArc instead when you
+/// require ChainListeners with static lifetimes, such as when you're using lightning-net-tokio.
+pub struct BlockNotifier<'a, CL: Deref<Target = ChainListener + 'a> + 'a> {
+ listeners: Mutex<Vec<CL>>,
chain_monitor: Arc<ChainWatchInterface>,
+ phantom: PhantomData<&'a ()>,
}
-impl<'a> BlockNotifier<'a> {
+impl<'a, CL: Deref<Target = ChainListener + 'a> + 'a> BlockNotifier<'a, CL> {
/// Constructs a new BlockNotifier without any listeners.
- pub fn new(chain_monitor: Arc<ChainWatchInterface>) -> BlockNotifier<'a> {
+ pub fn new(chain_monitor: Arc<ChainWatchInterface>) -> BlockNotifier<'a, CL> {
BlockNotifier {
listeners: Mutex::new(Vec::new()),
chain_monitor,
+ phantom: PhantomData,
}
}
- /// Register the given listener to receive events. Only a weak pointer is provided and
- /// the registration should be freed once that pointer expires.
+ /// Register the given listener to receive events.
// TODO: unregister
- pub fn register_listener(&self, listener: Weak<ChainListener + 'a>) {
+ pub fn register_listener(&self, listener: CL) {
let mut vec = self.listeners.lock().unwrap();
vec.push(listener);
}
pub fn block_connected_checked(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> bool {
let last_seen = self.chain_monitor.reentered();
- let listeners = self.listeners.lock().unwrap().clone();
+ let listeners = self.listeners.lock().unwrap();
for listener in listeners.iter() {
- match listener.upgrade() {
- Some(arc) => arc.block_connected(header, height, txn_matched, indexes_of_txn_matched),
- None => ()
- }
+ listener.block_connected(header, height, txn_matched, indexes_of_txn_matched);
}
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().clone();
+ let listeners = self.listeners.lock().unwrap();
for listener in listeners.iter() {
- match listener.upgrade() {
- Some(arc) => arc.block_disconnected(&header, disconnected_height),
- None => ()
- }
+ listener.block_disconnected(&header, disconnected_height);
}
}
-
}
/// Utility to capture some common parts of ChainWatchInterface implementors.
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) {
}
}
-
/// Checks if a given transaction matches the current filter.
pub fn does_match_tx(&self, tx: &Transaction) -> bool {
let watched = self.watched.lock().unwrap();
projects / rust-lightning / blobdiff