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 {
/// 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>;
+
+ /// Gets the list of transactions and transaction indices that the ChainWatchInterface is
+ /// watching for.
+ fn filter_block<'a>(&self, block: &'a Block) -> (Vec<&'a Transaction>, Vec<u32>);
+
+ /// Returns a usize that changes when the ChainWatchInterface's watched data is modified.
+ /// Users of `filter_block` should pre-save a copy of `reentered`'s return value and use it to
+ /// determine whether they need to re-filter a given block.
+ fn reentered(&self) -> usize;
}
/// An interface to send a transaction to the Bitcoin network.
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
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);
}
}
}
Err(ChainError::NotSupported)
}
+
+ fn filter_block<'a>(&self, block: &'a Block) -> (Vec<&'a Transaction>, Vec<u32>) {
+ let mut matched = Vec::new();
+ let mut matched_index = Vec::new();
+ {
+ let watched = self.watched.lock().unwrap();
+ for (index, transaction) in block.txdata.iter().enumerate() {
+ if self.does_match_tx_unguarded(transaction, &watched) {
+ matched.push(transaction);
+ matched_index.push(index as u32);
+ }
+ }
+ }
+ (matched, matched_index)
+ }
+
+ fn reentered(&self) -> usize {
+ self.reentered.load(Ordering::Relaxed)
+ }
}
impl ChainWatchInterfaceUtil {
projects / rust-lightning / blobdiff