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

   1 use std::collections::{BTreeMap, HashSet};
   2 use std::io::Cursor;
   3 use std::ops::Add;
   4 use std::sync::Arc;
   5 use std::time::{Duration, Instant, SystemTime};
   6
   7 use lightning::ln::msgs::{ChannelAnnouncement, ChannelUpdate, UnsignedChannelAnnouncement, UnsignedChannelUpdate};
   8 use lightning::routing::gossip::NetworkGraph;
   9 use lightning::util::ser::Readable;
  10 use tokio_postgres::{Client, Connection, NoTls, Socket};
  11 use tokio_postgres::tls::NoTlsStream;
  12
  13 use crate::{config, TestLogger};
  14 use crate::serialization::MutatedProperties;
  15
  16 /// The delta set needs to be a BTreeMap so the keys are sorted.
  17 /// That way, the scids in the response automatically grow monotonically
  18 pub(super) type DeltaSet = BTreeMap<u64, ChannelDelta>;
  19
  20 pub(super) struct AnnouncementDelta {
  21         pub(super) seen: u32,
  22         pub(super) announcement: UnsignedChannelAnnouncement,
  23 }
  24
  25 pub(super) struct UpdateDelta {
  26         pub(super) seen: u32,
  27         pub(super) update: UnsignedChannelUpdate,
  28 }
  29
  30 pub(super) struct DirectedUpdateDelta {
  31         pub(super) last_update_before_seen: Option<UnsignedChannelUpdate>,
  32         pub(super) mutated_properties: MutatedProperties,
  33         pub(super) latest_update_after_seen: Option<UpdateDelta>,
  34 }
  35
  36 pub(super) struct ChannelDelta {
  37         pub(super) announcement: Option<AnnouncementDelta>,
  38         pub(super) updates: (Option<DirectedUpdateDelta>, Option<DirectedUpdateDelta>),
  39         pub(super) first_update_seen: Option<u32>,
  40 }
  41
  42 impl Default for ChannelDelta {
  43         fn default() -> Self {
  44                 Self { announcement: None, updates: (None, None), first_update_seen: None }
  45         }
  46 }
  47
  48 impl Default for DirectedUpdateDelta {
  49         fn default() -> Self {
  50                 Self {
  51                         last_update_before_seen: None,
  52                         mutated_properties: MutatedProperties::default(),
  53                         latest_update_after_seen: None,
  54                 }
  55         }
  56 }
  57
  58 pub(super) async fn connect_to_db() -> (Client, Connection<Socket, NoTlsStream>) {
  59         let connection_config = config::db_connection_config();
  60         connection_config.connect(NoTls).await.unwrap()
  61 }
  62
  63 /// Fetch all the channel announcements that are presently in the network graph, regardless of
  64 /// whether they had been seen before.
  65 /// Also include all announcements for which the first update was announced
  66 /// after `last_syc_timestamp`
  67 pub(super) async fn fetch_channel_announcements(delta_set: &mut DeltaSet, network_graph: Arc<NetworkGraph<TestLogger>>, client: &Client, last_sync_timestamp: u32) {
  68         let last_sync_timestamp_object = SystemTime::UNIX_EPOCH.add(Duration::from_secs(last_sync_timestamp as u64));
  69         println!("Obtaining channel ids from network graph");
  70         let channel_ids = {
  71                 let read_only_graph = network_graph.read_only();
  72                 println!("Retrieved read-only network graph copy");
  73                 let channel_iterator = read_only_graph.channels().unordered_iter();
  74                 channel_iterator
  75                         .filter(|c| c.1.announcement_message.is_some())
  76                         .map(|c| c.1.announcement_message.as_ref().unwrap().contents.short_channel_id as i64)
  77                         .collect::<Vec<_>>()
  78         };
  79
  80         println!("Obtaining corresponding database entries");
  81         // get all the channel announcements that are currently in the network graph
  82         let announcement_rows = client.query("SELECT announcement_signed, seen FROM channel_announcements WHERE short_channel_id = any($1) ORDER BY short_channel_id ASC", &[&channel_ids]).await.unwrap();
  83
  84         for current_announcement_row in announcement_rows {
  85                 let blob: Vec<u8> = current_announcement_row.get("announcement_signed");
  86                 let mut readable = Cursor::new(blob);
  87                 let unsigned_announcement = ChannelAnnouncement::read(&mut readable).unwrap().contents;
  88
  89                 let scid = unsigned_announcement.short_channel_id;
  90                 let current_seen_timestamp_object: SystemTime = current_announcement_row.get("seen");
  91                 let current_seen_timestamp: u32 = current_seen_timestamp_object.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs() as u32;
  92
  93                 let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
  94                 (*current_channel_delta).announcement = Some(AnnouncementDelta {
  95                         announcement: unsigned_announcement,
  96                         seen: current_seen_timestamp,
  97                 });
  98         }
  99
 100         println!("Annotating channel announcements whose oldest channel update in a given direction occurred after the last sync");
 101         /// Steps:
 102         /// — Obtain all updates, distinct by (scid, direction), ordered by seen DESC // to find the oldest update in a given direction
 103         /// — From those updates, select distinct by (scid), ordered by seen DESC (to obtain the newer one per direction)
 104         /// This will allow us to mark the first time updates in both directions were seen
 105
 106         // here is where the channels whose first update in either direction occurred after
 107         // `last_seen_timestamp` are added to the selection
 108         let newer_oldest_directional_updates = client.query("
 109                 SELECT DISTINCT ON (short_channel_id) *
 110                 FROM (
 111                         SELECT DISTINCT ON (short_channel_id, direction) blob_signed
 112                         FROM channel_updates
 113                         WHERE short_channel_id = any($1)
 114                         ORDER BY seen ASC, short_channel_id ASC, direction ASC
 115                 ) AS directional_last_seens
 116                 ORDER BY short_channel_id ASC, seen DESC
 117         ", &[&channel_ids]).await.unwrap();
 118
 119         for current_row in newer_oldest_directional_updates {
 120                 let blob: Vec<u8> = current_row.get("blob_signed");
 121                 let mut readable = Cursor::new(blob);
 122                 let unsigned_update = ChannelUpdate::read(&mut readable).unwrap().contents;
 123                 let scid = unsigned_update.short_channel_id;
 124                 let current_seen_timestamp_object: SystemTime = current_row.get("seen");
 125                 let current_seen_timestamp: u32 = current_seen_timestamp_object.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs() as u32;
 126
 127                 if (current_seen_timestamp > last_sync_timestamp) {
 128                         // the newer of the two oldest seen directional updates came after last sync timestamp
 129                         let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
 130                         // first time a channel was seen in both directions
 131                         (*current_channel_delta).first_bidirectional_updates_seen = Some(current_seen_timestamp);
 132                 }
 133         }
 134 }
 135
 136 pub(super) async fn fetch_channel_updates(delta_set: &mut DeltaSet, client: &Client, last_sync_timestamp: u32, consider_intermediate_updates: bool) {
 137         let start = Instant::now();
 138         let last_sync_timestamp_object = SystemTime::UNIX_EPOCH.add(Duration::from_secs(last_sync_timestamp as u64));
 139
 140         // get the latest channel update in each direction prior to last_sync_timestamp, provided
 141         // there was an update in either direction that happened after the last sync (to avoid
 142         // collecting too many reference updates)
 143         let reference_rows = client.query("SELECT DISTINCT ON (short_channel_id, direction) id, direction, blob_signed FROM channel_updates WHERE seen < $1 AND short_channel_id IN (SELECT short_channel_id FROM channel_updates WHERE seen >= $1 GROUP BY short_channel_id) ORDER BY short_channel_id ASC, direction ASC, seen DESC", &[&last_sync_timestamp_object]).await.unwrap();
 144
 145         println!("Fetched reference rows ({}): {:?}", reference_rows.len(), start.elapsed());
 146
 147         let mut last_seen_update_ids: Vec<i32> = Vec::with_capacity(reference_rows.len());
 148         let mut non_intermediate_ids: HashSet<i32> = HashSet::new();
 149
 150         for current_reference in reference_rows {
 151                 let update_id: i32 = current_reference.get("id");
 152                 last_seen_update_ids.push(update_id);
 153                 non_intermediate_ids.insert(update_id);
 154
 155                 let direction: bool = current_reference.get("direction");
 156                 let blob: Vec<u8> = current_reference.get("blob_signed");
 157                 let mut readable = Cursor::new(blob);
 158                 let unsigned_channel_update = ChannelUpdate::read(&mut readable).unwrap().contents;
 159                 let scid = unsigned_channel_update.short_channel_id;
 160
 161                 let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
 162                 let update_delta = if !direction {
 163                         (*current_channel_delta).updates.0.get_or_insert(DirectedUpdateDelta::default())
 164                 } else {
 165                         (*current_channel_delta).updates.1.get_or_insert(DirectedUpdateDelta::default())
 166                 };
 167                 update_delta.last_update_before_seen = Some(unsigned_channel_update);
 168         }
 169
 170         println!("Processed reference rows (delta size: {}): {:?}", delta_set.len(), start.elapsed());
 171
 172         // get all the intermediate channel updates
 173         // (to calculate the set of mutated fields for snapshotting, where intermediate updates may
 174         // have been omitted)
 175
 176         let mut intermediate_update_prefix = "";
 177         if !consider_intermediate_updates {
 178                 intermediate_update_prefix = "DISTINCT ON (short_channel_id, direction)";
 179         }
 180
 181         let query_string = format!("SELECT {} id, direction, blob_signed, seen FROM channel_updates WHERE seen >= $1 ORDER BY short_channel_id ASC, direction ASC, seen DESC", intermediate_update_prefix);
 182         let intermediate_updates = client.query(&query_string, &[&last_sync_timestamp_object]).await.unwrap();
 183         println!("Fetched intermediate rows ({}): {:?}", intermediate_updates.len(), start.elapsed());
 184
 185         let mut previous_scid = u64::MAX;
 186         let mut previously_seen_directions = (false, false);
 187
 188         // let mut previously_seen_directions = (false, false);
 189         let mut intermediate_update_count = 0;
 190         for intermediate_update in intermediate_updates {
 191                 let update_id: i32 = intermediate_update.get("id");
 192                 if non_intermediate_ids.contains(&update_id) {
 193                         continue;
 194                 }
 195                 intermediate_update_count += 1;
 196
 197                 let direction: bool = intermediate_update.get("direction");
 198                 let current_seen_timestamp_object: SystemTime = intermediate_update.get("seen");
 199                 let current_seen_timestamp: u32 = current_seen_timestamp_object.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs() as u32;
 200                 let blob: Vec<u8> = intermediate_update.get("blob_signed");
 201                 let mut readable = Cursor::new(blob);
 202                 let unsigned_channel_update = ChannelUpdate::read(&mut readable).unwrap().contents;
 203
 204                 let scid = unsigned_channel_update.short_channel_id;
 205                 if scid != previous_scid {
 206                         previous_scid = scid;
 207                         previously_seen_directions = (false, false);
 208                 }
 209
 210                 // get the write configuration for this particular channel's directional details
 211                 let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
 212                 let update_delta = if !direction {
 213                         (*current_channel_delta).updates.0.get_or_insert(DirectedUpdateDelta::default())
 214                 } else {
 215                         (*current_channel_delta).updates.1.get_or_insert(DirectedUpdateDelta::default())
 216                 };
 217
 218                 {
 219                         // handle the latest deltas
 220                         if !direction && !previously_seen_directions.0 {
 221                                 previously_seen_directions.0 = true;
 222                                 update_delta.latest_update_after_seen = Some(UpdateDelta {
 223                                         seen: current_seen_timestamp,
 224                                         update: unsigned_channel_update.clone(),
 225                                 });
 226                         } else if direction && !previously_seen_directions.1 {
 227                                 previously_seen_directions.1 = true;
 228                                 update_delta.latest_update_after_seen = Some(UpdateDelta {
 229                                         seen: current_seen_timestamp,
 230                                         update: unsigned_channel_update.clone(),
 231                                 });
 232                         }
 233                 }
 234
 235                 // determine mutations
 236                 if let Some(last_seen_update) = update_delta.last_update_before_seen.as_ref(){
 237                         if unsigned_channel_update.flags != last_seen_update.flags {
 238                                 update_delta.mutated_properties.flags = true;
 239                         }
 240                         if unsigned_channel_update.cltv_expiry_delta != last_seen_update.cltv_expiry_delta {
 241                                 update_delta.mutated_properties.cltv_expiry_delta = true;
 242                         }
 243                         if unsigned_channel_update.htlc_minimum_msat != last_seen_update.htlc_minimum_msat {
 244                                 update_delta.mutated_properties.htlc_minimum_msat = true;
 245                         }
 246                         if unsigned_channel_update.fee_base_msat != last_seen_update.fee_base_msat {
 247                                 update_delta.mutated_properties.fee_base_msat = true;
 248                         }
 249                         if unsigned_channel_update.fee_proportional_millionths != last_seen_update.fee_proportional_millionths {
 250                                 update_delta.mutated_properties.fee_proportional_millionths = true;
 251                         }
 252                         if unsigned_channel_update.htlc_maximum_msat != last_seen_update.htlc_maximum_msat {
 253                                 update_delta.mutated_properties.htlc_maximum_msat = true;
 254                         }
 255                 }
 256
 257         }
 258         println!("Processed intermediate rows ({}) (delta size: {}): {:?}", intermediate_update_count, delta_set.len(), start.elapsed());
 259 }
 260
 261 pub(super) fn filter_delta_set(delta_set: &mut DeltaSet) {
 262         let original_length = delta_set.len();
 263         let keys: Vec<u64> = delta_set.keys().cloned().collect();
 264         for k in keys {
 265                 let v = delta_set.get(&k).unwrap();
 266                 if v.announcement.is_none() {
 267                         // this channel is not currently in the network graph
 268                         delta_set.remove(&k);
 269                         continue;
 270                 }
 271
 272                 let update_meets_criteria = |update: &Option<DirectedUpdateDelta>| {
 273                         if update.is_none() {
 274                                 return false;
 275                         };
 276                         let update_reference = update.as_ref().unwrap();
 277                         // update_reference.latest_update_after_seen.is_some() && !update_reference.intermediate_updates.is_empty()
 278                         // if there has been an update after the channel was first seen
 279                         update_reference.latest_update_after_seen.is_some()
 280                 };
 281
 282                 let direction_a_meets_criteria = update_meets_criteria(&v.updates.0);
 283                 let direction_b_meets_criteria = update_meets_criteria(&v.updates.1);
 284
 285                 if !direction_a_meets_criteria && !direction_b_meets_criteria {
 286                         delta_set.remove(&k);
 287                 }
 288         }
 289
 290         let new_length = delta_set.len();
 291         if original_length != new_length {
 292                 println!("length modified!");
 293         }
 294 }