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