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

   1 use std::convert::TryInto;
   2 use std::ops::Deref;
   3 use std::sync::Arc;
   4 use std::sync::Mutex;
   5
   6 use bitcoin::{BlockHash, TxOut};
   7 use bitcoin::blockdata::block::Block;
   8 use bitcoin::hashes::Hash;
   9 use lightning::log_error;
  10 use lightning::routing::gossip::{NetworkGraph, P2PGossipSync};
  11 use lightning::routing::utxo::{UtxoFuture, UtxoLookup, UtxoResult, UtxoLookupError};
  12 use lightning::util::logger::Logger;
  13 use lightning_block_sync::{BlockData, BlockSource};
  14 use lightning_block_sync::http::BinaryResponse;
  15 use lightning_block_sync::rest::RestClient;
  16
  17 use crate::config;
  18 use crate::types::GossipPeerManager;
  19
  20 pub(crate) struct ChainVerifier<L: Deref + Clone + Send + Sync + 'static> where L::Target: Logger {
  21         rest_client: Arc<RestClient>,
  22         graph: Arc<NetworkGraph<L>>,
  23         outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>,
  24         peer_handler: Mutex<Option<GossipPeerManager<L>>>,
  25         logger: L
  26 }
  27
  28 struct RestBinaryResponse(Vec<u8>);
  29
  30 impl<L: Deref + Clone + Send + Sync + 'static> ChainVerifier<L> where L::Target: Logger {
  31         pub(crate) fn new(graph: Arc<NetworkGraph<L>>, outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>, logger: L) -> Self {
  32                 ChainVerifier {
  33                         rest_client: Arc::new(RestClient::new(config::bitcoin_rest_endpoint()).unwrap()),
  34                         outbound_gossiper,
  35                         graph,
  36                         peer_handler: Mutex::new(None),
  37                         logger
  38                 }
  39         }
  40         pub(crate) fn set_ph(&self, peer_handler: GossipPeerManager<L>) {
  41                 *self.peer_handler.lock().unwrap() = Some(peer_handler);
  42         }
  43
  44         async fn retrieve_utxo(client: Arc<RestClient>, short_channel_id: u64, logger: L) -> Result<TxOut, UtxoLookupError> {
  45                 let block_height = (short_channel_id >> 5 * 8) as u32; // block height is most significant three bytes
  46                 let transaction_index = ((short_channel_id >> 2 * 8) & 0xffffff) as u32;
  47                 let output_index = (short_channel_id & 0xffff) as u16;
  48
  49                 let mut block = Self::retrieve_block(client, block_height, logger.clone()).await?;
  50                 if transaction_index as usize >= block.txdata.len() {
  51                         log_error!(logger, "Could't find transaction {} in block {}", transaction_index, block_height);
  52                         return Err(UtxoLookupError::UnknownTx);
  53                 }
  54                 let mut transaction = block.txdata.swap_remove(transaction_index as usize);
  55                 if output_index as usize >= transaction.output.len() {
  56                         log_error!(logger, "Could't find output {} in transaction {}", output_index, transaction.txid());
  57                         return Err(UtxoLookupError::UnknownTx);
  58                 }
  59                 Ok(transaction.output.swap_remove(output_index as usize))
  60         }
  61
  62         async fn retrieve_block(client: Arc<RestClient>, block_height: u32, logger: L) -> Result<Block, UtxoLookupError> {
  63                 let uri = format!("blockhashbyheight/{}.bin", block_height);
  64                 let block_hash_result =
  65                         client.request_resource::<BinaryResponse, RestBinaryResponse>(&uri).await;
  66                 let block_hash: Vec<u8> = block_hash_result.map_err(|error| {
  67                         log_error!(logger, "Could't find block hash at height {}: {}", block_height, error.to_string());
  68                         UtxoLookupError::UnknownChain
  69                 })?.0;
  70                 let block_hash = BlockHash::from_slice(&block_hash).unwrap();
  71
  72                 let block_result = client.get_block(&block_hash).await;
  73                 match block_result {
  74                         Ok(BlockData::FullBlock(block)) => {
  75                                 Ok(block)
  76                         },
  77                         Ok(_) => unreachable!(),
  78                         Err(error) => {
  79                                 log_error!(logger, "Couldn't retrieve block {}: {:?} ({})", block_height, error, block_hash);
  80                                 Err(UtxoLookupError::UnknownChain)
  81                         }
  82                 }
  83         }
  84 }
  85
  86 impl<L: Deref + Clone + Send + Sync + 'static> UtxoLookup for ChainVerifier<L> where L::Target: Logger {
  87         fn get_utxo(&self, _genesis_hash: &BlockHash, short_channel_id: u64) -> UtxoResult {
  88                 let res = UtxoFuture::new();
  89                 let fut = res.clone();
  90                 let graph_ref = Arc::clone(&self.graph);
  91                 let client_ref = Arc::clone(&self.rest_client);
  92                 let gossip_ref = Arc::clone(&self.outbound_gossiper);
  93                 let pm_ref = self.peer_handler.lock().unwrap().clone();
  94                 let logger_ref = self.logger.clone();
  95                 tokio::spawn(async move {
  96                         let res = Self::retrieve_utxo(client_ref, short_channel_id, logger_ref).await;
  97                         fut.resolve(&*graph_ref, &*gossip_ref, res);
  98                         if let Some(pm) = pm_ref { pm.process_events(); }
  99                 });
 100                 UtxoResult::Async(res)
 101         }
 102 }
 103
 104 impl TryInto<RestBinaryResponse> for BinaryResponse {
 105         type Error = std::io::Error;
 106
 107         fn try_into(self) -> Result<RestBinaryResponse, Self::Error> {
 108                 Ok(RestBinaryResponse(self.0))
 109         }
 110 }