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