2 #![deny(broken_intra_doc_links)]
3 #![deny(private_intra_doc_links)]
4 #![deny(non_upper_case_globals)]
5 #![deny(non_camel_case_types)]
6 #![deny(non_snake_case)]
7 #![deny(unused_variables)]
8 #![deny(unused_imports)]
12 use std::collections::{HashMap, HashSet};
14 use std::io::BufReader;
17 use lightning::log_info;
19 use lightning::routing::gossip::{NetworkGraph, NodeId};
20 use lightning::util::logger::Logger;
21 use lightning::util::ser::{ReadableArgs, Writeable};
22 use tokio::sync::mpsc;
23 use tokio_postgres::{Client, NoTls};
24 use crate::lookup::DeltaSet;
26 use crate::persistence::GossipPersister;
27 use crate::serialization::UpdateSerialization;
28 use crate::snapshot::Snapshotter;
29 use crate::types::RGSSLogger;
43 /// The purpose of this prefix is to identify the serialization format, should other rapid gossip
44 /// sync formats arise in the future.
46 /// The fourth byte is the protocol version in case our format gets updated.
47 const GOSSIP_PREFIX: [u8; 4] = [76, 68, 75, 1];
49 pub struct RapidSyncProcessor<L: Deref> where L::Target: Logger {
50 network_graph: Arc<NetworkGraph<L>>,
54 pub struct SerializedResponse {
56 pub message_count: u32,
57 pub announcement_count: u32,
58 pub update_count: u32,
59 pub update_count_full: u32,
60 pub update_count_incremental: u32,
63 impl<L: Deref + Clone + Send + Sync + 'static> RapidSyncProcessor<L> where L::Target: Logger {
64 pub fn new(logger: L) -> Self {
65 let network = config::network();
66 let network_graph = if let Ok(file) = File::open(&config::network_graph_cache_path()) {
67 log_info!(logger, "Initializing from cached network graph…");
68 let mut buffered_reader = BufReader::new(file);
69 let network_graph_result = NetworkGraph::read(&mut buffered_reader, logger.clone());
70 if let Ok(network_graph) = network_graph_result {
71 log_info!(logger, "Initialized from cached network graph!");
74 log_info!(logger, "Initialization from cached network graph failed: {}", network_graph_result.err().unwrap());
75 NetworkGraph::new(network, logger.clone())
78 NetworkGraph::new(network, logger.clone())
80 let arc_network_graph = Arc::new(network_graph);
82 network_graph: arc_network_graph,
87 pub async fn start_sync(&self) {
88 // means to indicate sync completion status within this module
89 let (sync_completion_sender, mut sync_completion_receiver) = mpsc::channel::<()>(1);
91 if config::DOWNLOAD_NEW_GOSSIP {
92 let (mut persister, persistence_sender) = GossipPersister::new(self.network_graph.clone(), self.logger.clone());
94 log_info!(self.logger, "Starting gossip download");
95 tokio::spawn(tracking::download_gossip(persistence_sender, sync_completion_sender,
96 Arc::clone(&self.network_graph), self.logger.clone()));
97 log_info!(self.logger, "Starting gossip db persistence listener");
98 tokio::spawn(async move { persister.persist_gossip().await; });
100 sync_completion_sender.send(()).await.unwrap();
103 let sync_completion = sync_completion_receiver.recv().await;
104 if sync_completion.is_none() {
105 panic!("Sync failed!");
107 log_info!(self.logger, "Initial sync complete!");
109 // start the gossip snapshotting service
110 Snapshotter::new(Arc::clone(&self.network_graph), self.logger.clone()).snapshot_gossip().await;
114 pub(crate) async fn connect_to_db() -> Client {
115 let connection_config = config::db_connection_config();
116 let (client, connection) = connection_config.connect(NoTls).await.unwrap();
118 tokio::spawn(async move {
119 if let Err(e) = connection.await {
120 panic!("connection error: {}", e);
124 client.execute("set time zone UTC", &[]).await.unwrap();
128 /// This method generates a no-op blob that can be used as a delta where none exists.
130 /// The primary purpose of this method is the scenario of a client retrieving and processing a
131 /// given snapshot, and then immediately retrieving the would-be next snapshot at the timestamp
132 /// indicated by the one that was just processed.
133 /// Previously, there would not be a new snapshot to be processed for that particular timestamp yet,
134 /// and the server would return a 404 error.
136 /// In principle, this method could also be used to address another unfortunately all too common
137 /// pitfall: requesting snapshots from intermediate timestamps, i. e. those that are not multiples
138 /// of our granularity constant. Note that for that purpose, this method could be very dangerous,
139 /// because if consumed, the `timestamp` value calculated here will overwrite the timestamp that
140 /// the client previously had, which could result in duplicated or omitted gossip down the line.
141 fn serialize_empty_blob(current_timestamp: u64) -> Vec<u8> {
142 let mut blob = GOSSIP_PREFIX.to_vec();
144 let network = config::network();
145 let genesis_block = bitcoin::blockdata::constants::genesis_block(network);
146 let chain_hash = genesis_block.block_hash();
147 chain_hash.write(&mut blob).unwrap();
149 let blob_timestamp = Snapshotter::<Arc<RGSSLogger>>::round_down_to_nearest_multiple(current_timestamp, config::SNAPSHOT_CALCULATION_INTERVAL as u64) as u32;
150 blob_timestamp.write(&mut blob).unwrap();
152 0u32.write(&mut blob).unwrap(); // node count
153 0u32.write(&mut blob).unwrap(); // announcement count
154 0u32.write(&mut blob).unwrap(); // update count
159 async fn serialize_delta<L: Deref + Clone>(network_graph: Arc<NetworkGraph<L>>, last_sync_timestamp: u32, logger: L) -> SerializedResponse where L::Target: Logger {
160 let client = connect_to_db().await;
162 network_graph.remove_stale_channels_and_tracking();
164 let mut output: Vec<u8> = vec![];
166 // set a flag if the chain hash is prepended
167 // chain hash only necessary if either channel announcements or non-incremental updates are present
168 // for announcement-free incremental-only updates, chain hash can be skipped
170 let mut node_id_set: HashSet<NodeId> = HashSet::new();
171 let mut node_id_indices: HashMap<NodeId, usize> = HashMap::new();
172 let mut node_ids: Vec<NodeId> = Vec::new();
173 let mut duplicate_node_ids: i32 = 0;
175 let mut get_node_id_index = |node_id: NodeId| {
176 if node_id_set.insert(node_id) {
177 node_ids.push(node_id);
178 let index = node_ids.len() - 1;
179 node_id_indices.insert(node_id, index);
182 duplicate_node_ids += 1;
183 node_id_indices[&node_id]
186 let mut delta_set = DeltaSet::new();
187 lookup::fetch_channel_announcements(&mut delta_set, network_graph, &client, last_sync_timestamp, logger.clone()).await;
188 log_info!(logger, "announcement channel count: {}", delta_set.len());
189 lookup::fetch_channel_updates(&mut delta_set, &client, last_sync_timestamp, logger.clone()).await;
190 log_info!(logger, "update-fetched channel count: {}", delta_set.len());
191 lookup::filter_delta_set(&mut delta_set, logger.clone());
192 log_info!(logger, "update-filtered channel count: {}", delta_set.len());
193 let serialization_details = serialization::serialize_delta_set(delta_set, last_sync_timestamp);
195 // process announcements
196 // write the number of channel announcements to the output
197 let announcement_count = serialization_details.announcements.len() as u32;
198 announcement_count.write(&mut output).unwrap();
199 let mut previous_announcement_scid = 0;
200 for current_announcement in serialization_details.announcements {
201 let id_index_1 = get_node_id_index(current_announcement.node_id_1);
202 let id_index_2 = get_node_id_index(current_announcement.node_id_2);
203 let mut stripped_announcement = serialization::serialize_stripped_channel_announcement(¤t_announcement, id_index_1, id_index_2, previous_announcement_scid);
204 output.append(&mut stripped_announcement);
206 previous_announcement_scid = current_announcement.short_channel_id;
210 let mut previous_update_scid = 0;
211 let update_count = serialization_details.updates.len() as u32;
212 update_count.write(&mut output).unwrap();
214 let default_update_values = serialization_details.full_update_defaults;
215 if update_count > 0 {
216 default_update_values.cltv_expiry_delta.write(&mut output).unwrap();
217 default_update_values.htlc_minimum_msat.write(&mut output).unwrap();
218 default_update_values.fee_base_msat.write(&mut output).unwrap();
219 default_update_values.fee_proportional_millionths.write(&mut output).unwrap();
220 default_update_values.htlc_maximum_msat.write(&mut output).unwrap();
223 let mut update_count_full = 0;
224 let mut update_count_incremental = 0;
225 for current_update in serialization_details.updates {
226 match ¤t_update {
227 UpdateSerialization::Full(_) => {
228 update_count_full += 1;
230 UpdateSerialization::Incremental(_, _) | UpdateSerialization::Reminder(_, _) => {
231 update_count_incremental += 1;
235 let mut stripped_update = serialization::serialize_stripped_channel_update(¤t_update, &default_update_values, previous_update_scid);
236 output.append(&mut stripped_update);
238 previous_update_scid = current_update.scid();
242 let message_count = announcement_count + update_count;
244 let mut prefixed_output = GOSSIP_PREFIX.to_vec();
246 // always write the chain hash
247 serialization_details.chain_hash.write(&mut prefixed_output).unwrap();
248 // always write the latest seen timestamp
249 let latest_seen_timestamp = serialization_details.latest_seen;
250 let overflow_seconds = latest_seen_timestamp % config::SNAPSHOT_CALCULATION_INTERVAL;
251 let serialized_seen_timestamp = latest_seen_timestamp.saturating_sub(overflow_seconds);
252 serialized_seen_timestamp.write(&mut prefixed_output).unwrap();
254 let node_id_count = node_ids.len() as u32;
255 node_id_count.write(&mut prefixed_output).unwrap();
257 for current_node_id in node_ids {
258 current_node_id.write(&mut prefixed_output).unwrap();
261 prefixed_output.append(&mut output);
263 log_info!(logger, "duplicated node ids: {}", duplicate_node_ids);
264 log_info!(logger, "latest seen timestamp: {:?}", serialization_details.latest_seen);
267 data: prefixed_output,
272 update_count_incremental,