1 use std::io::ErrorKind;
6 use bitcoin::blockdata::constants::ChainHash;
7 use bitcoin::{BlockHash, TxOut};
8 use bitcoin::blockdata::block::Block;
9 use bitcoin::hashes::Hash;
10 use lightning::log_error;
11 use lightning::routing::gossip::{NetworkGraph, P2PGossipSync};
12 use lightning::routing::utxo::{UtxoFuture, UtxoLookup, UtxoResult, UtxoLookupError};
13 use lightning::util::logger::Logger;
14 use lightning_block_sync::{BlockData, BlockSource};
15 use lightning_block_sync::http::BinaryResponse;
16 use lightning_block_sync::rest::RestClient;
19 use crate::types::GossipPeerManager;
21 pub(crate) struct ChainVerifier<L: Deref + Clone + Send + Sync + 'static> where L::Target: Logger {
22 rest_client: Arc<RestClient>,
23 graph: Arc<NetworkGraph<L>>,
24 outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>,
25 peer_handler: Mutex<Option<GossipPeerManager<L>>>,
29 struct RestBinaryResponse(Vec<u8>);
31 impl<L: Deref + Clone + Send + Sync + 'static> ChainVerifier<L> where L::Target: Logger {
32 pub(crate) fn new(graph: Arc<NetworkGraph<L>>, outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>, logger: L) -> Self {
34 rest_client: Arc::new(RestClient::new(config::bitcoin_rest_endpoint()).unwrap()),
37 peer_handler: Mutex::new(None),
41 pub(crate) fn set_ph(&self, peer_handler: GossipPeerManager<L>) {
42 *self.peer_handler.lock().unwrap() = Some(peer_handler);
45 async fn retrieve_utxo(client: Arc<RestClient>, short_channel_id: u64, logger: L) -> Result<TxOut, UtxoLookupError> {
46 let block_height = (short_channel_id >> 5 * 8) as u32; // block height is most significant three bytes
47 let transaction_index = ((short_channel_id >> 2 * 8) & 0xffffff) as u32;
48 let output_index = (short_channel_id & 0xffff) as u16;
50 let mut block = Self::retrieve_block(client, block_height, logger.clone()).await?;
51 if transaction_index as usize >= block.txdata.len() {
52 log_error!(logger, "Could't find transaction {} in block {}", transaction_index, block_height);
53 return Err(UtxoLookupError::UnknownTx);
55 let mut transaction = block.txdata.swap_remove(transaction_index as usize);
56 if output_index as usize >= transaction.output.len() {
57 log_error!(logger, "Could't find output {} in transaction {}", output_index, transaction.txid());
58 return Err(UtxoLookupError::UnknownTx);
60 Ok(transaction.output.swap_remove(output_index as usize))
63 async fn retrieve_block(client: Arc<RestClient>, block_height: u32, logger: L) -> Result<Block, UtxoLookupError> {
64 let uri = format!("blockhashbyheight/{}.bin", block_height);
65 let block_hash_result =
66 client.request_resource::<BinaryResponse, RestBinaryResponse>(&uri).await;
67 let block_hash: Vec<u8> = block_hash_result.map_err(|error| {
69 ErrorKind::InvalidData => {
70 // the response length was likely 0
71 log_error!(logger, "Could't find block hash at height {}: Invalid response! Please make sure the `-rest=1` flag is set.", block_height);
74 log_error!(logger, "Could't find block hash at height {}: {}", block_height, error.to_string());
77 UtxoLookupError::UnknownChain
79 let block_hash = BlockHash::from_slice(&block_hash).unwrap();
81 let block_result = client.get_block(&block_hash).await;
83 Ok(BlockData::FullBlock(block)) => {
86 Ok(_) => unreachable!(),
88 log_error!(logger, "Couldn't retrieve block {}: {:?} ({})", block_height, error, block_hash);
89 Err(UtxoLookupError::UnknownChain)
95 impl<L: Deref + Clone + Send + Sync + 'static> UtxoLookup for ChainVerifier<L> where L::Target: Logger {
96 fn get_utxo(&self, _genesis_hash: &ChainHash, short_channel_id: u64) -> UtxoResult {
97 let res = UtxoFuture::new();
98 let fut = res.clone();
99 let graph_ref = Arc::clone(&self.graph);
100 let client_ref = Arc::clone(&self.rest_client);
101 let gossip_ref = Arc::clone(&self.outbound_gossiper);
102 let pm_ref = self.peer_handler.lock().unwrap().clone();
103 let logger_ref = self.logger.clone();
104 tokio::spawn(async move {
105 let res = Self::retrieve_utxo(client_ref, short_channel_id, logger_ref).await;
106 fut.resolve(&*graph_ref, &*gossip_ref, res);
107 if let Some(pm) = pm_ref { pm.process_events(); }
109 UtxoResult::Async(res)
113 impl TryInto<RestBinaryResponse> for BinaryResponse {
114 type Error = std::io::Error;
116 fn try_into(self) -> Result<RestBinaryResponse, Self::Error> {
117 Ok(RestBinaryResponse(self.0))