Merge pull request #63 from arik-so/2023/10/ordering_fix
[rapid-gossip-sync-server] / src / tests / mod.rs
index 09147e920b501fd735ee7016c41a90da055b794b..ed3a99629d37841f39bbd506ad488cfb5c96bd49 100644 (file)
@@ -2,6 +2,7 @@
 
 use std::cell::RefCell;
 use std::sync::Arc;
+use std::{fs, thread};
 use std::time::{SystemTime, UNIX_EPOCH};
 use bitcoin::{BlockHash, Network};
 use bitcoin::secp256k1::ecdsa::Signature;
@@ -16,6 +17,7 @@ use lightning::util::ser::Writeable;
 use lightning_rapid_gossip_sync::RapidGossipSync;
 use crate::{config, serialize_delta};
 use crate::persistence::GossipPersister;
+use crate::snapshot::Snapshotter;
 use crate::types::{GossipMessage, tests::TestLogger};
 
 const CLIENT_BACKDATE_INTERVAL: u32 = 3600 * 24 * 7; // client backdates RGS by a week
@@ -39,7 +41,7 @@ fn current_time() -> u32 {
 
 pub(crate) fn db_test_schema() -> String {
        DB_TEST_SCHEMA.with(|suffix_reference| {
-               let mut suffix_option = suffix_reference.borrow();
+               let suffix_option = suffix_reference.borrow();
                suffix_option.as_ref().unwrap().clone()
        })
 }
@@ -114,7 +116,10 @@ impl SchemaSanitizer {
                        let unix_time = current_time.duration_since(UNIX_EPOCH).expect("Time went backwards");
                        let timestamp_seconds = unix_time.as_secs();
                        let timestamp_nanos = unix_time.as_nanos();
-                       let preimage = format!("{}", timestamp_nanos);
+                       // sometimes Rust thinks two tests start at the same nanosecond, causing a schema conflict
+                       let thread_id = thread::current().id();
+                       let preimage = format!("{:?}-{}", thread_id, timestamp_nanos);
+                       println!("test schema preimage: {}", preimage);
                        let suffix = Sha256dHash::hash(preimage.as_bytes()).into_inner().to_hex();
                        // the schema must start with a letter
                        let schema = format!("test_{}_{}", timestamp_seconds, suffix);
@@ -136,6 +141,26 @@ impl Drop for SchemaSanitizer {
        }
 }
 
+struct CacheSanitizer {}
+
+impl CacheSanitizer {
+       /// The CacheSanitizer instantiation requires that there be a schema sanitizer
+       fn new(_: &SchemaSanitizer) -> Self {
+               Self {}
+       }
+
+       fn cache_path(&self) -> String {
+               format!("./res/{}/", db_test_schema())
+       }
+}
+
+impl Drop for CacheSanitizer {
+       fn drop(&mut self) {
+               let cache_path = self.cache_path();
+               fs::remove_dir_all(cache_path).unwrap();
+       }
+}
+
 
 async fn clean_test_db() {
        let client = crate::connect_to_db().await;
@@ -168,9 +193,9 @@ async fn test_trivial_setup() {
                network_graph_arc.update_channel_unsigned(&update_1.contents).unwrap();
                network_graph_arc.update_channel_unsigned(&update_2.contents).unwrap();
 
-               receiver.send(GossipMessage::ChannelAnnouncement(announcement)).await.unwrap();
-               receiver.send(GossipMessage::ChannelUpdate(update_1)).await.unwrap();
-               receiver.send(GossipMessage::ChannelUpdate(update_2)).await.unwrap();
+               receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+               receiver.send(GossipMessage::ChannelUpdate(update_1, None)).await.unwrap();
+               receiver.send(GossipMessage::ChannelUpdate(update_2, None)).await.unwrap();
                drop(receiver);
                persister.persist_gossip().await;
        }
@@ -215,3 +240,574 @@ async fn test_trivial_setup() {
        assert_eq!(last_update_seen_a, update_result - CLIENT_BACKDATE_INTERVAL);
        assert_eq!(last_update_seen_b, update_result - CLIENT_BACKDATE_INTERVAL);
 }
+
+#[tokio::test]
+async fn test_full_snapshot_recency() {
+       let _sanitizer = SchemaSanitizer::new();
+       let logger = Arc::new(TestLogger::new());
+       let network_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let network_graph_arc = Arc::new(network_graph);
+
+       let short_channel_id = 1;
+       let timestamp = current_time();
+       println!("timestamp: {}", timestamp);
+
+       { // seed the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+               let announcement = generate_announcement(short_channel_id);
+               network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+               receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+
+               { // direction false
+                       { // first update
+                               let update = generate_update(short_channel_id, false, timestamp - 1, 0, 0, 0, 0, 38);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       { // second update
+                               let update = generate_update(short_channel_id, false, timestamp, 0, 0, 0, 0, 39);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+               { // direction true
+                       { // first and only update
+                               let update = generate_update(short_channel_id, true, timestamp, 0, 0, 0, 0, 10);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let client_graph_arc = Arc::new(client_graph);
+
+       { // sync after initial seed
+               let serialization = serialize_delta(network_graph_arc.clone(), 0, logger.clone()).await;
+               logger.assert_log_contains("rapid_gossip_sync_server", "announcement channel count: 1", 1);
+
+               let channel_count = network_graph_arc.read_only().channels().len();
+
+               assert_eq!(channel_count, 1);
+               assert_eq!(serialization.message_count, 3);
+               assert_eq!(serialization.announcement_count, 1);
+               assert_eq!(serialization.update_count, 2);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&serialization.data).unwrap();
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+               assert!(update_result < timestamp);
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 1);
+
+               let first_channel = channels.get(&short_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               // ensure the update in one direction shows the latest fee
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 39);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 10);
+       }
+
+       clean_test_db().await;
+}
+
+#[tokio::test]
+async fn test_full_snapshot_recency_with_wrong_seen_order() {
+       let _sanitizer = SchemaSanitizer::new();
+       let logger = Arc::new(TestLogger::new());
+       let network_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let network_graph_arc = Arc::new(network_graph);
+
+       let short_channel_id = 1;
+       let timestamp = current_time();
+       println!("timestamp: {}", timestamp);
+
+       { // seed the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+               let announcement = generate_announcement(short_channel_id);
+               network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+               receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+
+               { // direction false
+                       { // first update, seen latest
+                               let update = generate_update(short_channel_id, false, timestamp - 1, 0, 0, 0, 0, 38);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, Some(timestamp))).await.unwrap();
+                       }
+                       { // second update, seen first
+                               let update = generate_update(short_channel_id, false, timestamp, 0, 0, 0, 0, 39);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, Some(timestamp - 1))).await.unwrap();
+                       }
+               }
+               { // direction true
+                       { // first and only update
+                               let update = generate_update(short_channel_id, true, timestamp, 0, 0, 0, 0, 10);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let client_graph_arc = Arc::new(client_graph);
+
+       { // sync after initial seed
+               let serialization = serialize_delta(network_graph_arc.clone(), 0, logger.clone()).await;
+               logger.assert_log_contains("rapid_gossip_sync_server", "announcement channel count: 1", 1);
+
+               let channel_count = network_graph_arc.read_only().channels().len();
+
+               assert_eq!(channel_count, 1);
+               assert_eq!(serialization.message_count, 3);
+               assert_eq!(serialization.announcement_count, 1);
+               assert_eq!(serialization.update_count, 2);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&serialization.data).unwrap();
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+               assert!(update_result < timestamp);
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 1);
+
+               let first_channel = channels.get(&short_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               // ensure the update in one direction shows the latest fee
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 39);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 10);
+       }
+
+       clean_test_db().await;
+}
+
+#[tokio::test]
+async fn test_full_snapshot_recency_with_wrong_propagation_order() {
+       let _sanitizer = SchemaSanitizer::new();
+       let logger = Arc::new(TestLogger::new());
+       let network_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let network_graph_arc = Arc::new(network_graph);
+
+       let short_channel_id = 1;
+       let timestamp = current_time();
+       println!("timestamp: {}", timestamp);
+
+       { // seed the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+               let announcement = generate_announcement(short_channel_id);
+               network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+               receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+
+               { // direction false
+                       // apply updates in their timestamp order
+                       let update_1 = generate_update(short_channel_id, false, timestamp - 1, 0, 0, 0, 0, 38);
+                       let update_2 = generate_update(short_channel_id, false, timestamp, 0, 0, 0, 0, 39);
+                       network_graph_arc.update_channel_unsigned(&update_1.contents).unwrap();
+                       network_graph_arc.update_channel_unsigned(&update_2.contents).unwrap();
+
+                       // propagate updates in their seen order
+                       receiver.send(GossipMessage::ChannelUpdate(update_2, Some(timestamp - 1))).await.unwrap();
+                       receiver.send(GossipMessage::ChannelUpdate(update_1, Some(timestamp))).await.unwrap();
+               }
+               { // direction true
+                       { // first and only update
+                               let update = generate_update(short_channel_id, true, timestamp, 0, 0, 0, 0, 10);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let client_graph_arc = Arc::new(client_graph);
+
+       { // sync after initial seed
+               let serialization = serialize_delta(network_graph_arc.clone(), 0, logger.clone()).await;
+               logger.assert_log_contains("rapid_gossip_sync_server", "announcement channel count: 1", 1);
+
+               let channel_count = network_graph_arc.read_only().channels().len();
+
+               assert_eq!(channel_count, 1);
+               assert_eq!(serialization.message_count, 3);
+               assert_eq!(serialization.announcement_count, 1);
+               assert_eq!(serialization.update_count, 2);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&serialization.data).unwrap();
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+               assert!(update_result < timestamp);
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 1);
+
+               let first_channel = channels.get(&short_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               // ensure the update in one direction shows the latest fee
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 39);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 10);
+       }
+
+       clean_test_db().await;
+}
+
+#[tokio::test]
+async fn test_full_snapshot_mutiny_scenario() {
+       let _sanitizer = SchemaSanitizer::new();
+       let logger = Arc::new(TestLogger::new());
+       let network_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let network_graph_arc = Arc::new(network_graph);
+
+       let short_channel_id = 873706024403271681;
+       let timestamp = current_time();
+       // let oldest_simulation_timestamp = 1693300588;
+       let latest_simulation_timestamp = 1695909301;
+       let timestamp_offset = timestamp - latest_simulation_timestamp;
+       println!("timestamp: {}", timestamp);
+
+       { // seed the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+               let announcement = generate_announcement(short_channel_id);
+               network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+               receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+
+               { // direction false
+                       {
+                               let update = generate_update(short_channel_id, false, 1693507369 + timestamp_offset, 0, 0, 0, 0, 38);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1693680390 + timestamp_offset, 0, 0, 0, 0, 38);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1693749109 + timestamp_offset, 0, 0, 0, 0, 200);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1693925190 + timestamp_offset, 0, 0, 0, 0, 200);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1694008323 + timestamp_offset, 0, 0, 0, 0, 209);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1694219924 + timestamp_offset, 0, 0, 0, 0, 209);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1694267536 + timestamp_offset, 0, 0, 0, 0, 210);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1694458808 + timestamp_offset, 0, 0, 0, 0, 210);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1694526734 + timestamp_offset, 0, 0, 0, 0, 200);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1694794765 + timestamp_offset, 0, 0, 0, 0, 200);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, Some(1695909301 + 2 * config::SYMLINK_GRANULARITY_INTERVAL + timestamp_offset))).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, false, 1695909301 + timestamp_offset, 0, 0, 0, 0, 130);
+                               // network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+               { // direction true
+                       {
+                               let update = generate_update(short_channel_id, true, 1693300588 + timestamp_offset, 0, 0, 0, 0, 10);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       {
+                               let update = generate_update(short_channel_id, true, 1695003621 + timestamp_offset, 0, 0, 0, 0, 10);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let client_graph_arc = Arc::new(client_graph);
+
+       { // sync after initial seed
+               let serialization = serialize_delta(network_graph_arc.clone(), 0, logger.clone()).await;
+               logger.assert_log_contains("rapid_gossip_sync_server", "announcement channel count: 1", 1);
+
+               let channel_count = network_graph_arc.read_only().channels().len();
+
+               assert_eq!(channel_count, 1);
+               assert_eq!(serialization.message_count, 3);
+               assert_eq!(serialization.announcement_count, 1);
+               assert_eq!(serialization.update_count, 2);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&serialization.data).unwrap();
+               println!("update result: {}", update_result);
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+               assert!(update_result < timestamp);
+
+               let timestamp_delta = timestamp - update_result;
+               println!("timestamp delta: {}", timestamp_delta);
+               assert!(timestamp_delta < config::snapshot_generation_interval());
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 1);
+
+               let first_channel = channels.get(&short_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 130);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 10);
+       }
+
+       clean_test_db().await;
+}
+
+#[tokio::test]
+async fn test_full_snapshot_interlaced_channel_timestamps() {
+       let _sanitizer = SchemaSanitizer::new();
+       let logger = Arc::new(TestLogger::new());
+       let network_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let network_graph_arc = Arc::new(network_graph);
+
+       let main_channel_id = 1;
+       let timestamp = current_time();
+       println!("timestamp: {}", timestamp);
+
+       { // seed the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+               let secondary_channel_id = main_channel_id + 1;
+
+               { // main channel
+                       let announcement = generate_announcement(main_channel_id);
+                       network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+                       receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+               }
+
+               { // secondary channel
+                       let announcement = generate_announcement(secondary_channel_id);
+                       network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+                       receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+               }
+
+               { // main channel
+                       { // direction false
+                               let update = generate_update(main_channel_id, false, timestamp - 2, 0, 0, 0, 0, 10);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       { // direction true
+                               let update = generate_update(main_channel_id, true, timestamp - 2, 0, 0, 0, 0, 5);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               { // in-between channel
+                       { // direction false
+                               let update = generate_update(secondary_channel_id, false, timestamp - 1, 0, 0, 0, 0, 42);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       { // direction true
+                               let update = generate_update(secondary_channel_id, true, timestamp - 1, 0, 0, 0, 0, 42);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               { // main channel
+                       { // direction false
+                               let update = generate_update(main_channel_id, false, timestamp, 0, 0, 0, 0, 11);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+                       { // direction true
+                               let update = generate_update(main_channel_id, true, timestamp, 0, 0, 0, 0, 6);
+                               network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                               receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+                       }
+               }
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let client_graph_arc = Arc::new(client_graph);
+
+       { // sync after initial seed
+               let serialization = serialize_delta(network_graph_arc.clone(), 0, logger.clone()).await;
+               logger.assert_log_contains("rapid_gossip_sync_server", "announcement channel count: 2", 1);
+
+               let channel_count = network_graph_arc.read_only().channels().len();
+
+               assert_eq!(channel_count, 2);
+               assert_eq!(serialization.message_count, 6);
+               assert_eq!(serialization.announcement_count, 2);
+               assert_eq!(serialization.update_count, 4);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&serialization.data).unwrap();
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+               assert!(update_result < timestamp);
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 2);
+
+               let first_channel = channels.get(&main_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               // ensure the update in one direction shows the latest fee
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 11);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 6);
+       }
+
+       clean_test_db().await;
+}
+
+#[tokio::test]
+async fn test_full_snapshot_persistence() {
+       let schema_sanitizer = SchemaSanitizer::new();
+       let logger = Arc::new(TestLogger::new());
+       let network_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+       let network_graph_arc = Arc::new(network_graph);
+       let snapshotter = Snapshotter::new(network_graph_arc.clone(), logger.clone());
+       let cache_sanitizer = CacheSanitizer::new(&schema_sanitizer);
+
+       let short_channel_id = 1;
+       let timestamp = current_time();
+       println!("timestamp: {}", timestamp);
+
+       { // seed the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+               let announcement = generate_announcement(short_channel_id);
+               network_graph_arc.update_channel_from_announcement_no_lookup(&announcement).unwrap();
+               receiver.send(GossipMessage::ChannelAnnouncement(announcement, None)).await.unwrap();
+
+               { // direction true
+                       let update = generate_update(short_channel_id, true, timestamp, 0, 0, 0, 0, 10);
+                       network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                       receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+               }
+
+               { // direction false
+                       let update = generate_update(short_channel_id, false, timestamp - 1, 0, 0, 0, 0, 38);
+                       network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                       receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+               }
+
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       let cache_path = cache_sanitizer.cache_path();
+       let symlink_path = format!("{}/symlinks/0.bin", cache_path);
+
+       // generate snapshots
+       {
+               snapshotter.generate_snapshots(20, 5, &[5, u64::MAX], &cache_path, Some(10)).await;
+
+               let symlinked_data = fs::read(&symlink_path).unwrap();
+               let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+               let client_graph_arc = Arc::new(client_graph);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&symlinked_data).unwrap();
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 1);
+
+               let first_channel = channels.get(&short_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               // ensure the update in one direction shows the latest fee
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 38);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 10);
+       }
+
+       { // update the db
+               let (mut persister, receiver) = GossipPersister::new(network_graph_arc.clone(), logger.clone());
+
+               { // second update
+                       let update = generate_update(short_channel_id, false, timestamp + 30, 0, 0, 0, 0, 39);
+                       network_graph_arc.update_channel_unsigned(&update.contents).unwrap();
+                       receiver.send(GossipMessage::ChannelUpdate(update, None)).await.unwrap();
+               }
+
+               drop(receiver);
+               persister.persist_gossip().await;
+       }
+
+       // regenerate snapshots
+       {
+               snapshotter.generate_snapshots(20, 5, &[5, u64::MAX], &cache_path, Some(10)).await;
+
+               let symlinked_data = fs::read(&symlink_path).unwrap();
+               let client_graph = NetworkGraph::new(Network::Bitcoin, logger.clone());
+               let client_graph_arc = Arc::new(client_graph);
+
+               let rgs = RapidGossipSync::new(client_graph_arc.clone(), logger.clone());
+               let update_result = rgs.update_network_graph(&symlinked_data).unwrap();
+               // the update result must be a multiple of our snapshot granularity
+               assert_eq!(update_result % config::snapshot_generation_interval(), 0);
+
+               let readonly_graph = client_graph_arc.read_only();
+               let channels = readonly_graph.channels();
+               let client_channel_count = channels.len();
+               assert_eq!(client_channel_count, 1);
+
+               let first_channel = channels.get(&short_channel_id).unwrap();
+               assert!(&first_channel.announcement_message.is_none());
+               // ensure the update in one direction shows the latest fee
+               assert_eq!(first_channel.one_to_two.as_ref().unwrap().fees.proportional_millionths, 39);
+               assert_eq!(first_channel.two_to_one.as_ref().unwrap().fees.proportional_millionths, 10);
+       }
+
+       // clean up afterwards
+       clean_test_db().await;
+}