_ 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         pub(super) serialization_update_flags: Option<u8>,
  35 }
  36
  37 pub(super) struct ChannelDelta {
  38         pub(super) announcement: Option<AnnouncementDelta>,
  39         pub(super) updates: (Option<DirectedUpdateDelta>, Option<DirectedUpdateDelta>),
  40         pub(super) first_bidirectional_updates_seen: Option<u32>,
  41         /// The seen timestamp of the older of the two latest directional updates
  42         pub(super) requires_reminder: bool,
  43 }
  44
  45 impl Default for ChannelDelta {
  46         fn default() -> Self {
  47                 Self {
  48                         announcement: None,
  49                         updates: (None, None),
  50                         first_bidirectional_updates_seen: None,
  51                         requires_reminder: false,
  52                 }
  53         }
  54 }
  55
  56 impl Default for DirectedUpdateDelta {
  57         fn default() -> Self {
  58                 Self {
  59                         last_update_before_seen: None,
  60                         mutated_properties: MutatedProperties::default(),
  61                         latest_update_after_seen: None,
  62                         serialization_update_flags: None,
  63                 }
  64         }
  65 }
  66
  67 pub(super) async fn connect_to_db() -> (Client, Connection<Socket, NoTlsStream>) {
  68         let connection_config = config::db_connection_config();
  69         connection_config.connect(NoTls).await.unwrap()
  70 }
  71
  72 /// Fetch all the channel announcements that are presently in the network graph, regardless of
  73 /// whether they had been seen before.
  74 /// Also include all announcements for which the first update was announced
  75 /// after `last_sync_timestamp`
  76 pub(super) async fn fetch_channel_announcements(delta_set: &mut DeltaSet, network_graph: Arc<NetworkGraph<TestLogger>>, client: &Client, last_sync_timestamp: u32) {
  77         println!("Obtaining channel ids from network graph");
  78         let last_sync_timestamp_object = SystemTime::UNIX_EPOCH.add(Duration::from_secs(last_sync_timestamp as u64));
  79         let channel_ids = {
  80                 let read_only_graph = network_graph.read_only();
  81                 println!("Retrieved read-only network graph copy");
  82                 let channel_iterator = read_only_graph.channels().unordered_iter();
  83                 channel_iterator
  84                         .filter(|c| c.1.announcement_message.is_some())
  85                         .map(|c| c.1.announcement_message.as_ref().unwrap().contents.short_channel_id as i64)
  86                         .collect::<Vec<_>>()
  87         };
  88
  89         println!("Obtaining corresponding database entries");
  90         // get all the channel announcements that are currently in the network graph
  91         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();
  92
  93         for current_announcement_row in announcement_rows {
  94                 let blob: Vec<u8> = current_announcement_row.get("announcement_signed");
  95                 let mut readable = Cursor::new(blob);
  96                 let unsigned_announcement = ChannelAnnouncement::read(&mut readable).unwrap().contents;
  97
  98                 let scid = unsigned_announcement.short_channel_id;
  99                 let current_seen_timestamp_object: SystemTime = current_announcement_row.get("seen");
 100                 let current_seen_timestamp: u32 = current_seen_timestamp_object.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs() as u32;
 101
 102                 let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
 103                 (*current_channel_delta).announcement = Some(AnnouncementDelta {
 104                         announcement: unsigned_announcement,
 105                         seen: current_seen_timestamp,
 106                 });
 107         }
 108
 109         {
 110                 // THIS STEP IS USED TO DETERMINE IF A CHANNEL SHOULD BE OMITTED FROM THE DELTA
 111
 112                 println!("Annotating channel announcements whose oldest channel update in a given direction occurred after the last sync");
 113                 // Steps:
 114                 // — Obtain all updates, distinct by (scid, direction), ordered by seen DESC // to find the oldest update in a given direction
 115                 // — From those updates, select distinct by (scid), ordered by seen DESC (to obtain the newer one per direction)
 116                 // This will allow us to mark the first time updates in both directions were seen
 117
 118                 // here is where the channels whose first update in either direction occurred after
 119                 // `last_seen_timestamp` are added to the selection
 120                 let newer_oldest_directional_updates = client.query("
 121                         SELECT * FROM (
 122                                 SELECT DISTINCT ON (short_channel_id) *
 123                                 FROM (
 124                                         SELECT DISTINCT ON (short_channel_id, direction) short_channel_id, seen
 125                                         FROM channel_updates
 126                                         WHERE short_channel_id = any($1)
 127                                         ORDER BY short_channel_id ASC, direction ASC, seen ASC
 128                                 ) AS directional_last_seens
 129                                 ORDER BY short_channel_id ASC, seen DESC
 130                         ) AS distinct_chans
 131                         WHERE distinct_chans.seen >= $2
 132                         ", &[&channel_ids, &last_sync_timestamp_object]).await.unwrap();
 133
 134                 for current_row in newer_oldest_directional_updates {
 135                         let scid: i64 = current_row.get("short_channel_id");
 136                         let current_seen_timestamp_object: SystemTime = current_row.get("seen");
 137                         let current_seen_timestamp: u32 = current_seen_timestamp_object.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs() as u32;
 138
 139                         // the newer of the two oldest seen directional updates came after last sync timestamp
 140                         let current_channel_delta = delta_set.entry(scid as u64).or_insert(ChannelDelta::default());
 141                         // first time a channel was seen in both directions
 142                         (*current_channel_delta).first_bidirectional_updates_seen = Some(current_seen_timestamp);
 143                 }
 144         }
 145
 146         {
 147                 // THIS STEP IS USED TO DETERMINE IF A REMINDER UPDATE SHOULD BE SENT
 148
 149                 println!("Annotating channel announcements whose latest channel update in a given direction occurred more than six days ago");
 150                 // Steps:
 151                 // — Obtain all updates, distinct by (scid, direction), ordered by seen DESC
 152                 // — From those updates, select distinct by (scid), ordered by seen ASC (to obtain the older one per direction)
 153                 let reminder_threshold_timestamp = SystemTime::now().checked_sub(config::CHANNEL_REMINDER_AGE).unwrap();
 154                 let read_only_graph = network_graph.read_only();
 155
 156                 let older_latest_directional_updates = client.query("
 157                         SELECT short_channel_id FROM (
 158                                 SELECT DISTINCT ON (short_channel_id) *
 159                                 FROM (
 160                                         SELECT DISTINCT ON (short_channel_id, direction) short_channel_id, seen
 161                                         FROM channel_updates
 162                                         WHERE short_channel_id = any($1)
 163                                         ORDER BY short_channel_id ASC, direction ASC, seen DESC
 164                                 ) AS directional_last_seens
 165                                 ORDER BY short_channel_id ASC, seen ASC
 166                         ) AS distinct_chans
 167                         WHERE distinct_chans.seen <= $2
 168                         ", &[&channel_ids, &reminder_threshold_timestamp]).await.unwrap();
 169
 170                 for current_row in older_latest_directional_updates {
 171                         let scid: i64 = current_row.get("short_channel_id");
 172
 173                         // annotate this channel as requiring that reminders be sent to the client
 174                         let current_channel_delta = delta_set.entry(scid as u64).or_insert(ChannelDelta::default());
 175
 176                         // way might be able to get away with not using this
 177                         (*current_channel_delta).requires_reminder = true;
 178
 179                         if let Some(current_channel_info) = read_only_graph.channel(scid as u64) {
 180                                 if current_channel_info.one_to_two.is_none() || current_channel_info.two_to_one.is_none() {
 181                                         // we don't send reminders if we don't have bidirectional update data
 182                                         continue;
 183                                 }
 184
 185                                 if let Some(info) = current_channel_info.one_to_two.as_ref() {
 186                                         let flags: u8 = if info.enabled { 0 } else { 2 };
 187                                         let current_update = (*current_channel_delta).updates.0.get_or_insert(DirectedUpdateDelta::default());
 188                                         current_update.serialization_update_flags = Some(flags);
 189                                 }
 190
 191                                 if let Some(info) = current_channel_info.two_to_one.as_ref() {
 192                                         let flags: u8 = if info.enabled { 1 } else { 3 };
 193                                         let current_update = (*current_channel_delta).updates.1.get_or_insert(DirectedUpdateDelta::default());
 194                                         current_update.serialization_update_flags = Some(flags);
 195                                 }
 196                         } else {
 197                                 // we don't send reminders if we don't have the channel
 198                                 continue;
 199                         }
 200                 }
 201         }
 202 }
 203
 204 pub(super) async fn fetch_channel_updates(delta_set: &mut DeltaSet, client: &Client, last_sync_timestamp: u32, consider_intermediate_updates: bool) {
 205         let start = Instant::now();
 206         let last_sync_timestamp_object = SystemTime::UNIX_EPOCH.add(Duration::from_secs(last_sync_timestamp as u64));
 207
 208         // get the latest channel update in each direction prior to last_sync_timestamp, provided
 209         // there was an update in either direction that happened after the last sync (to avoid
 210         // collecting too many reference updates)
 211         let reference_rows = client.query("
 212                 SELECT DISTINCT ON (short_channel_id, direction) id, direction, blob_signed
 213                 FROM channel_updates
 214                 WHERE seen < $1 AND short_channel_id IN (
 215                         SELECT short_channel_id
 216                         FROM channel_updates
 217                         WHERE seen >= $1
 218                         GROUP BY short_channel_id
 219                 )
 220                 ORDER BY short_channel_id ASC, direction ASC, seen DESC
 221                 ", &[&last_sync_timestamp_object]).await.unwrap();
 222
 223         println!("Fetched reference rows ({}): {:?}", reference_rows.len(), start.elapsed());
 224
 225         let mut last_seen_update_ids: Vec<i32> = Vec::with_capacity(reference_rows.len());
 226         let mut non_intermediate_ids: HashSet<i32> = HashSet::new();
 227
 228         for current_reference in reference_rows {
 229                 let update_id: i32 = current_reference.get("id");
 230                 last_seen_update_ids.push(update_id);
 231                 non_intermediate_ids.insert(update_id);
 232
 233                 let direction: bool = current_reference.get("direction");
 234                 let blob: Vec<u8> = current_reference.get("blob_signed");
 235                 let mut readable = Cursor::new(blob);
 236                 let unsigned_channel_update = ChannelUpdate::read(&mut readable).unwrap().contents;
 237                 let scid = unsigned_channel_update.short_channel_id;
 238
 239                 let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
 240                 let update_delta = if !direction {
 241                         (*current_channel_delta).updates.0.get_or_insert(DirectedUpdateDelta::default())
 242                 } else {
 243                         (*current_channel_delta).updates.1.get_or_insert(DirectedUpdateDelta::default())
 244                 };
 245                 update_delta.last_update_before_seen = Some(unsigned_channel_update);
 246         }
 247
 248         println!("Processed reference rows (delta size: {}): {:?}", delta_set.len(), start.elapsed());
 249
 250         // get all the intermediate channel updates
 251         // (to calculate the set of mutated fields for snapshotting, where intermediate updates may
 252         // have been omitted)
 253
 254         let mut intermediate_update_prefix = "";
 255         if !consider_intermediate_updates {
 256                 intermediate_update_prefix = "DISTINCT ON (short_channel_id, direction)";
 257         }
 258
 259         let query_string = format!("
 260                 SELECT {} id, direction, blob_signed, seen
 261                 FROM channel_updates
 262                 WHERE seen >= $1
 263                 ORDER BY short_channel_id ASC, direction ASC, seen DESC
 264                 ", intermediate_update_prefix);
 265         let intermediate_updates = client.query(&query_string, &[&last_sync_timestamp_object]).await.unwrap();
 266         println!("Fetched intermediate rows ({}): {:?}", intermediate_updates.len(), start.elapsed());
 267
 268         let mut previous_scid = u64::MAX;
 269         let mut previously_seen_directions = (false, false);
 270
 271         // let mut previously_seen_directions = (false, false);
 272         let mut intermediate_update_count = 0;
 273         for intermediate_update in intermediate_updates {
 274                 let update_id: i32 = intermediate_update.get("id");
 275                 if non_intermediate_ids.contains(&update_id) {
 276                         continue;
 277                 }
 278                 intermediate_update_count += 1;
 279
 280                 let direction: bool = intermediate_update.get("direction");
 281                 let current_seen_timestamp_object: SystemTime = intermediate_update.get("seen");
 282                 let current_seen_timestamp: u32 = current_seen_timestamp_object.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs() as u32;
 283                 let blob: Vec<u8> = intermediate_update.get("blob_signed");
 284                 let mut readable = Cursor::new(blob);
 285                 let unsigned_channel_update = ChannelUpdate::read(&mut readable).unwrap().contents;
 286
 287                 let scid = unsigned_channel_update.short_channel_id;
 288                 if scid != previous_scid {
 289                         previous_scid = scid;
 290                         previously_seen_directions = (false, false);
 291                 }
 292
 293                 // get the write configuration for this particular channel's directional details
 294                 let current_channel_delta = delta_set.entry(scid).or_insert(ChannelDelta::default());
 295                 let update_delta = if !direction {
 296                         (*current_channel_delta).updates.0.get_or_insert(DirectedUpdateDelta::default())
 297                 } else {
 298                         (*current_channel_delta).updates.1.get_or_insert(DirectedUpdateDelta::default())
 299                 };
 300
 301                 {
 302                         // handle the latest deltas
 303                         if !direction && !previously_seen_directions.0 {
 304                                 previously_seen_directions.0 = true;
 305                                 update_delta.latest_update_after_seen = Some(UpdateDelta {
 306                                         seen: current_seen_timestamp,
 307                                         update: unsigned_channel_update.clone(),
 308                                 });
 309                         } else if direction && !previously_seen_directions.1 {
 310                                 previously_seen_directions.1 = true;
 311                                 update_delta.latest_update_after_seen = Some(UpdateDelta {
 312                                         seen: current_seen_timestamp,
 313                                         update: unsigned_channel_update.clone(),
 314                                 });
 315                         }
 316                 }
 317
 318                 // determine mutations
 319                 if let Some(last_seen_update) = update_delta.last_update_before_seen.as_ref() {
 320                         if unsigned_channel_update.flags != last_seen_update.flags {
 321                                 update_delta.mutated_properties.flags = true;
 322                         }
 323                         if unsigned_channel_update.cltv_expiry_delta != last_seen_update.cltv_expiry_delta {
 324                                 update_delta.mutated_properties.cltv_expiry_delta = true;
 325                         }
 326                         if unsigned_channel_update.htlc_minimum_msat != last_seen_update.htlc_minimum_msat {
 327                                 update_delta.mutated_properties.htlc_minimum_msat = true;
 328                         }
 329                         if unsigned_channel_update.fee_base_msat != last_seen_update.fee_base_msat {
 330                                 update_delta.mutated_properties.fee_base_msat = true;
 331                         }
 332                         if unsigned_channel_update.fee_proportional_millionths != last_seen_update.fee_proportional_millionths {
 333                                 update_delta.mutated_properties.fee_proportional_millionths = true;
 334                         }
 335                         if unsigned_channel_update.htlc_maximum_msat != last_seen_update.htlc_maximum_msat {
 336                                 update_delta.mutated_properties.htlc_maximum_msat = true;
 337                         }
 338                 }
 339         }
 340         println!("Processed intermediate rows ({}) (delta size: {}): {:?}", intermediate_update_count, delta_set.len(), start.elapsed());
 341 }
 342
 343 pub(super) fn filter_delta_set(delta_set: &mut DeltaSet) {
 344         let original_length = delta_set.len();
 345         let keys: Vec<u64> = delta_set.keys().cloned().collect();
 346         for k in keys {
 347                 let v = delta_set.get(&k).unwrap();
 348                 if v.announcement.is_none() {
 349                         // this channel is not currently in the network graph
 350                         delta_set.remove(&k);
 351                         continue;
 352                 }
 353
 354                 let update_meets_criteria = |update: &Option<DirectedUpdateDelta>| {
 355                         if update.is_none() {
 356                                 return false;
 357                         };
 358                         let update_reference = update.as_ref().unwrap();
 359                         // update_reference.latest_update_after_seen.is_some() && !update_reference.intermediate_updates.is_empty()
 360                         // if there has been an update after the channel was first seen
 361
 362                         v.requires_reminder || update_reference.latest_update_after_seen.is_some()
 363                 };
 364
 365                 let direction_a_meets_criteria = update_meets_criteria(&v.updates.0);
 366                 let direction_b_meets_criteria = update_meets_criteria(&v.updates.1);
 367
 368                 if !v.requires_reminder && !direction_a_meets_criteria && !direction_b_meets_criteria {
 369                         delta_set.remove(&k);
 370                 }
 371         }
 372
 373         let new_length = delta_set.len();
 374         if original_length != new_length {
 375                 println!("length modified!");
 376         }
 377 }