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

   1 use std::fs::OpenOptions;
   2 use std::io::{BufWriter, Write};
   3 use std::sync::Arc;
   4 use std::time::{Duration, Instant};
   5 use lightning::routing::gossip::NetworkGraph;
   6 use lightning::util::ser::Writeable;
   7 use tokio::sync::mpsc;
   8 use tokio_postgres::NoTls;
   9
  10 use crate::{config, hex_utils, TestLogger};
  11 use crate::types::GossipMessage;
  12
  13 pub(crate) struct GossipPersister {
  14         gossip_persistence_receiver: mpsc::Receiver<GossipMessage>,
  15         network_graph: Arc<NetworkGraph<TestLogger>>,
  16 }
  17
  18 impl GossipPersister {
  19         pub fn new(network_graph: Arc<NetworkGraph<TestLogger>>) -> (Self, mpsc::Sender<GossipMessage>) {
  20                 let (gossip_persistence_sender, gossip_persistence_receiver) =
  21                         mpsc::channel::<GossipMessage>(100);
  22                 (GossipPersister {
  23                         gossip_persistence_receiver,
  24                         network_graph
  25                 }, gossip_persistence_sender)
  26         }
  27
  28         pub(crate) async fn persist_gossip(&mut self) {
  29                 let connection_config = config::db_connection_config();
  30                 let (client, connection) =
  31                         connection_config.connect(NoTls).await.unwrap();
  32
  33                 tokio::spawn(async move {
  34                         if let Err(e) = connection.await {
  35                                 panic!("connection error: {}", e);
  36                         }
  37                 });
  38
  39                 {
  40                         // initialize the database
  41                         let initialization = client
  42                                 .execute(config::db_config_table_creation_query(), &[])
  43                                 .await;
  44                         if let Err(initialization_error) = initialization {
  45                                 panic!("db init error: {}", initialization_error);
  46                         }
  47
  48                         let initialization = client
  49                                 .execute(
  50                                         // TODO: figure out a way to fix the id value without Postgres complaining about
  51                                         // its value not being default
  52                                         "INSERT INTO config (id, db_schema) VALUES ($1, $2) ON CONFLICT (id) DO NOTHING",
  53                                         &[&1, &config::SCHEMA_VERSION]
  54                                 ).await;
  55                         if let Err(initialization_error) = initialization {
  56                                 panic!("db init error: {}", initialization_error);
  57                         }
  58
  59                         let initialization = client
  60                                 .execute(config::db_announcement_table_creation_query(), &[])
  61                                 .await;
  62                         if let Err(initialization_error) = initialization {
  63                                 panic!("db init error: {}", initialization_error);
  64                         }
  65
  66                         let initialization = client
  67                                 .execute(
  68                                         config::db_channel_update_table_creation_query(),
  69                                         &[],
  70                                 )
  71                                 .await;
  72                         if let Err(initialization_error) = initialization {
  73                                 panic!("db init error: {}", initialization_error);
  74                         }
  75
  76                         let initialization = client
  77                                 .batch_execute(config::db_index_creation_query())
  78                                 .await;
  79                         if let Err(initialization_error) = initialization {
  80                                 panic!("db init error: {}", initialization_error);
  81                         }
  82                 }
  83
  84                 // print log statement every minute
  85                 let mut latest_persistence_log = Instant::now() - Duration::from_secs(60);
  86                 let mut i = 0u32;
  87                 let mut latest_graph_cache_time = Instant::now();
  88                 // TODO: it would be nice to have some sort of timeout here so after 10 seconds of
  89                 // inactivity, some sort of message could be broadcast signaling the activation of request
  90                 // processing
  91                 while let Some(gossip_message) = &self.gossip_persistence_receiver.recv().await {
  92                         i += 1; // count the persisted gossip messages
  93
  94                         if latest_persistence_log.elapsed().as_secs() >= 60 {
  95                                 println!("Persisting gossip message #{}", i);
  96                                 latest_persistence_log = Instant::now();
  97                         }
  98
  99                         // has it been ten minutes? Just cache it
 100                         if latest_graph_cache_time.elapsed().as_secs() >= 600 {
 101                                 self.persist_network_graph();
 102                                 latest_graph_cache_time = Instant::now();
 103                         }
 104
 105                         match &gossip_message {
 106                                 GossipMessage::ChannelAnnouncement(announcement) => {
 107                                         let scid = announcement.contents.short_channel_id;
 108                                         let scid_hex = hex_utils::hex_str(&scid.to_be_bytes());
 109                                         // scid is 8 bytes
 110                                         // block height is the first three bytes
 111                                         // to obtain block height, shift scid right by 5 bytes (40 bits)
 112                                         let block_height = (scid >> 5 * 8) as i32;
 113                                         let chain_hash = announcement.contents.chain_hash.as_ref();
 114                                         let chain_hash_hex = hex_utils::hex_str(chain_hash);
 115
 116                                         // start with the type prefix, which is already known a priori
 117                                         let mut announcement_signed = Vec::new();
 118                                         announcement.write(&mut announcement_signed).unwrap();
 119
 120                                         let result = client
 121                                                 .execute("INSERT INTO channel_announcements (\
 122                                                         short_channel_id, \
 123                                                         block_height, \
 124                                                         chain_hash, \
 125                                                         announcement_signed \
 126                                                 ) VALUES ($1, $2, $3, $4) ON CONFLICT (short_channel_id) DO NOTHING", &[
 127                                                         &scid_hex,
 128                                                         &block_height,
 129                                                         &chain_hash_hex,
 130                                                         &announcement_signed
 131                                                 ]).await;
 132                                         if result.is_err() {
 133                                                 panic!("error: {}", result.err().unwrap());
 134                                         }
 135                                 }
 136                                 GossipMessage::ChannelUpdate(update) => {
 137                                         let scid = update.contents.short_channel_id;
 138                                         let scid_hex = hex_utils::hex_str(&scid.to_be_bytes());
 139
 140                                         let chain_hash = update.contents.chain_hash.as_ref();
 141                                         let chain_hash_hex = hex_utils::hex_str(chain_hash);
 142
 143                                         let timestamp = update.contents.timestamp as i64;
 144
 145                                         let channel_flags = update.contents.flags as i32;
 146                                         let direction = channel_flags & 1;
 147                                         let disable = (channel_flags & 2) > 0;
 148
 149                                         let composite_index = format!("{}:{}:{}", scid_hex, timestamp, direction);
 150
 151                                         let cltv_expiry_delta = update.contents.cltv_expiry_delta as i32;
 152                                         let htlc_minimum_msat = update.contents.htlc_minimum_msat as i64;
 153                                         let fee_base_msat = update.contents.fee_base_msat as i32;
 154                                         let fee_proportional_millionths =
 155                                                 update.contents.fee_proportional_millionths as i32;
 156                                         let htlc_maximum_msat = update.contents.htlc_maximum_msat as i64;
 157
 158                                         // start with the type prefix, which is already known a priori
 159                                         let mut update_signed = Vec::new();
 160                                         update.write(&mut update_signed).unwrap();
 161
 162                                         let result = client
 163                                                 .execute("INSERT INTO channel_updates (\
 164                                                         composite_index, \
 165                                                         chain_hash, \
 166                                                         short_channel_id, \
 167                                                         timestamp, \
 168                                                         channel_flags, \
 169                                                         direction, \
 170                                                         disable, \
 171                                                         cltv_expiry_delta, \
 172                                                         htlc_minimum_msat, \
 173                                                         fee_base_msat, \
 174                                                         fee_proportional_millionths, \
 175                                                         htlc_maximum_msat, \
 176                                                         blob_signed \
 177                                                 ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13)  ON CONFLICT (composite_index) DO NOTHING", &[
 178                                                         &composite_index,
 179                                                         &chain_hash_hex,
 180                                                         &scid_hex,
 181                                                         &timestamp,
 182                                                         &channel_flags,
 183                                                         &direction,
 184                                                         &disable,
 185                                                         &cltv_expiry_delta,
 186                                                         &htlc_minimum_msat,
 187                                                         &fee_base_msat,
 188                                                         &fee_proportional_millionths,
 189                                                         &htlc_maximum_msat,
 190                                                         &update_signed
 191                                                 ]).await;
 192                                         if result.is_err() {
 193                                                 panic!("error: {}", result.err().unwrap());
 194                                         }
 195                                 }
 196                         }
 197                 }
 198         }
 199
 200         fn persist_network_graph(&self) {
 201                 println!("Caching network graph…");
 202                 let cache_path = config::network_graph_cache_path();
 203                 let file = OpenOptions::new()
 204                         .create(true)
 205                         .write(true)
 206                         .truncate(true)
 207                         .open(&cache_path)
 208                         .unwrap();
 209                 self.network_graph.remove_stale_channels();
 210                 let mut writer = BufWriter::new(file);
 211                 self.network_graph.write(&mut writer).unwrap();
 212                 writer.flush().unwrap();
 213                 println!("Cached network graph!");
 214         }
 215 }