_ Git - rapid-gossip-sync-server/blob - src/verifier.rs

   1 use std::io::ErrorKind;
   2 use std::ops::Deref;
   3 use std::sync::Arc;
   4 use std::sync::Mutex;
   5
   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;
  17
  18 use crate::config;
  19 use crate::types::GossipPeerManager;
  20
  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>>>,
  26         logger: L
  27 }
  28
  29 struct RestBinaryResponse(Vec<u8>);
  30
  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 {
  33                 ChainVerifier {
  34                         rest_client: Arc::new(RestClient::new(config::bitcoin_rest_endpoint()).unwrap()),
  35                         outbound_gossiper,
  36                         graph,
  37                         peer_handler: Mutex::new(None),
  38                         logger
  39                 }
  40         }
  41         pub(crate) fn set_ph(&self, peer_handler: GossipPeerManager<L>) {
  42                 *self.peer_handler.lock().unwrap() = Some(peer_handler);
  43         }
  44
  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;
  49
  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);
  54                 }
  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);
  59                 }
  60                 Ok(transaction.output.swap_remove(output_index as usize))
  61         }
  62
  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| {
  68                         match error.kind() {
  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);
  72                                 }
  73                                 _ => {
  74                                         log_error!(logger, "Could't find block hash at height {}: {}", block_height, error.to_string());
  75                                 }
  76                         }
  77                         UtxoLookupError::UnknownChain
  78                 })?.0;
  79                 let block_hash = BlockHash::from_slice(&block_hash).unwrap();
  80
  81                 let block_result = client.get_block(&block_hash).await;
  82                 match block_result {
  83                         Ok(BlockData::FullBlock(block)) => {
  84                                 Ok(block)
  85                         },
  86                         Ok(_) => unreachable!(),
  87                         Err(error) => {
  88                                 log_error!(logger, "Couldn't retrieve block {}: {:?} ({})", block_height, error, block_hash);
  89                                 Err(UtxoLookupError::UnknownChain)
  90                         }
  91                 }
  92         }
  93 }
  94
  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(); }
 108                 });
 109                 UtxoResult::Async(res)
 110         }
 111 }
 112
 113 impl TryInto<RestBinaryResponse> for BinaryResponse {
 114         type Error = std::io::Error;
 115
 116         fn try_into(self) -> Result<RestBinaryResponse, Self::Error> {
 117                 Ok(RestBinaryResponse(self.0))
 118         }
 119 }