X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning-block-sync%2Fsrc%2Finit.rs;h=d51cd3ba606f9bd513326cc527ab677459b58b0d;hb=13a33409b519e57b7d14cd9e440223d3495d55eb;hp=da9895ae7213f0a529aa7d77f4d84f8ca8d077fd;hpb=8bfdfdc9e4b40390e825eaf7539170b9373b1d31;p=rust-lightning

diff --git a/lightning-block-sync/src/init.rs b/lightning-block-sync/src/init.rs
index da9895ae..d51cd3ba 100644
--- a/lightning-block-sync/src/init.rs
+++ b/lightning-block-sync/src/init.rs
@@ -1,3 +1,6 @@
+//! Utilities to assist in the initial sync required to initialize or reload Rust-Lightning objects
+//! from disk.
+
 use crate::{BlockSource, BlockSourceResult, Cache, ChainNotifier};
 use crate::poll::{ChainPoller, Validate, ValidatedBlockHeader};
 
@@ -7,6 +10,20 @@ use bitcoin::network::constants::Network;
 
 use lightning::chain;
 
+/// Returns a validated block header of the source's best chain tip.
+///
+/// Upon success, the returned header can be used to initialize [`SpvClient`]. Useful during a fresh
+/// start when there are no chain listeners to sync yet.
+///
+/// [`SpvClient`]: crate::SpvClient
+pub async fn validate_best_block_header<B: BlockSource>(block_source: &mut B) ->
+BlockSourceResult<ValidatedBlockHeader> {
+	let (best_block_hash, best_block_height) = block_source.get_best_block().await?;
+	block_source
+		.get_header(&best_block_hash, best_block_height).await?
+		.validate(best_block_hash)
+}
+
 /// Performs a one-time sync of chain listeners using a single *trusted* block source, bringing each
 /// listener's view of the chain from its paired block hash to `block_source`'s best chain tip.
 ///
@@ -38,7 +55,6 @@ use lightning::chain;
 ///
 /// use lightning_block_sync::*;
 ///
-/// use std::cell::RefCell;
 /// use std::io::Cursor;
 ///
 /// async fn init_sync<
@@ -83,7 +99,7 @@ use lightning::chain;
 ///
 /// 	// Synchronize any channel monitors and the channel manager to be on the best block.
 /// 	let mut cache = UnboundedCache::new();
-/// 	let mut monitor_listener = (RefCell::new(monitor), &*tx_broadcaster, &*fee_estimator, &*logger);
+/// 	let mut monitor_listener = (monitor, &*tx_broadcaster, &*fee_estimator, &*logger);
 /// 	let listeners = vec![
 /// 		(monitor_block_hash, &mut monitor_listener as &mut dyn chain::Listen),
 /// 		(manager_block_hash, &mut manager as &mut dyn chain::Listen),
@@ -92,7 +108,7 @@ use lightning::chain;
 /// 		block_source, Network::Bitcoin, &mut cache, listeners).await.unwrap();
 ///
 /// 	// Allow the chain monitor to watch any channels.
-/// 	let monitor = monitor_listener.0.into_inner();
+/// 	let monitor = monitor_listener.0;
 /// 	chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor);
 ///
 /// 	// Create an SPV client to notify the chain monitor and channel manager of block events.
@@ -102,19 +118,16 @@ use lightning::chain;
 /// }
 /// ```
 ///
-/// [`SpvClient`]: ../struct.SpvClient.html
-/// [`ChannelManager`]: ../../lightning/ln/channelmanager/struct.ChannelManager.html
-/// [`ChannelMonitor`]: ../../lightning/chain/channelmonitor/struct.ChannelMonitor.html
+/// [`SpvClient`]: crate::SpvClient
+/// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
+/// [`ChannelMonitor`]: lightning::chain::channelmonitor::ChannelMonitor
 pub async fn synchronize_listeners<B: BlockSource, C: Cache>(
 	block_source: &mut B,
 	network: Network,
 	header_cache: &mut C,
 	mut chain_listeners: Vec<(BlockHash, &mut dyn chain::Listen)>,
 ) -> BlockSourceResult<ValidatedBlockHeader> {
-	let (best_block_hash, best_block_height) = block_source.get_best_block().await?;
-	let best_header = block_source
-		.get_header(&best_block_hash, best_block_height).await?
-		.validate(best_block_hash)?;
+	let best_header = validate_best_block_header(block_source).await?;
 
 	// Fetch the header for the block hash paired with each listener.
 	let mut chain_listeners_with_old_headers = Vec::new();