1 // Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
2 #![deny(broken_intra_doc_links)]
3 #![deny(private_intra_doc_links)]
7 #![deny(non_upper_case_globals)]
8 #![deny(non_camel_case_types)]
9 #![deny(non_snake_case)]
11 #![deny(unused_variables)]
12 #![deny(unused_imports)]
13 //! This crate exposes client functionality to rapidly sync gossip data, aimed primarily at mobile
16 //! The rapid gossip sync server will provide a compressed response containing differential gossip
17 //! data. The gossip data is formatted compactly, omitting signatures and opportunistically
18 //! incremental where previous channel updates are known. This mechanism is enabled when the
19 //! timestamp of the last known channel update is communicated. A reference server implementation
20 //! can be found [on Github](https://github.com/lightningdevkit/rapid-gossip-sync-server).
22 //! The primary benefit of this syncing mechanism is that it allows a low-powered client to offload
23 //! the validation of gossip signatures to a semi-trusted server. This enables the client to
24 //! privately calculate routes for payments, and to do so much faster than requiring a full
25 //! peer-to-peer gossip sync to complete.
27 //! The server calculates its response on the basis of a client-provided `latest_seen` timestamp,
28 //! i.e., the server will return all rapid gossip sync data it has seen after the given timestamp.
31 //! Firstly, the data needs to be retrieved from the server. For example, you could use the server
32 //! at <https://rapidsync.lightningdevkit.org> with the following request format:
35 //! curl -o rapid_sync.lngossip https://rapidsync.lightningdevkit.org/snapshot/<last_sync_timestamp>
37 //! Note that the first ever rapid sync should use `0` for `last_sync_timestamp`.
39 //! After the gossip data snapshot has been downloaded, one of the client's graph processing
40 //! functions needs to be called. In this example, we process the update by reading its contents
41 //! from disk, which we do by calling [`RapidGossipSync::update_network_graph`]:
44 //! use bitcoin::blockdata::constants::genesis_block;
45 //! use bitcoin::Network;
46 //! use lightning::routing::gossip::NetworkGraph;
47 //! use lightning_rapid_gossip_sync::RapidGossipSync;
49 //! # use lightning::util::logger::{Logger, Record};
50 //! # struct FakeLogger {}
51 //! # impl Logger for FakeLogger {
52 //! # fn log(&self, record: Record) { }
54 //! # let logger = FakeLogger {};
56 //! let network_graph = NetworkGraph::new(Network::Bitcoin, &logger);
57 //! let rapid_sync = RapidGossipSync::new(&network_graph, &logger);
58 //! let snapshot_contents: &[u8] = &[0; 0];
59 //! // In no-std you need to provide the current time in unix epoch seconds
60 //! // otherwise you can use update_network_graph
61 //! let current_time_unix = 0;
62 //! let new_last_sync_timestamp_result = rapid_sync.update_network_graph_no_std(snapshot_contents, Some(current_time_unix));
65 #![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
67 #[cfg(ldk_bench)] extern crate criterion;
69 #[cfg(not(feature = "std"))]
72 #[cfg(feature = "std")]
75 use core::sync::atomic::{AtomicBool, Ordering};
78 use lightning::routing::gossip::NetworkGraph;
79 use lightning::util::logger::Logger;
81 pub use crate::error::GraphSyncError;
83 /// Error types that these functions can return
86 /// Core functionality of this crate
89 /// The main Rapid Gossip Sync object.
91 /// See [crate-level documentation] for usage.
93 /// [crate-level documentation]: crate
94 pub struct RapidGossipSync<NG: Deref<Target=NetworkGraph<L>>, L: Deref>
95 where L::Target: Logger {
98 is_initial_sync_complete: AtomicBool
101 impl<NG: Deref<Target=NetworkGraph<L>>, L: Deref> RapidGossipSync<NG, L> where L::Target: Logger {
102 /// Instantiate a new [`RapidGossipSync`] instance.
103 pub fn new(network_graph: NG, logger: L) -> Self {
107 is_initial_sync_complete: AtomicBool::new(false)
111 /// Sync gossip data from a file.
112 /// Returns the last sync timestamp to be used the next time rapid sync data is queried.
114 /// `network_graph`: The network graph to apply the updates to
116 /// `sync_path`: Path to the file where the gossip update data is located
118 #[cfg(feature = "std")]
119 pub fn sync_network_graph_with_file_path(
122 ) -> Result<u32, GraphSyncError> {
123 let mut file = File::open(sync_path)?;
124 self.update_network_graph_from_byte_stream(&mut file)
127 /// Update network graph from binary data.
128 /// Returns the last sync timestamp to be used the next time rapid sync data is queried.
130 /// `update_data`: `&[u8]` binary stream that comprises the update data
131 #[cfg(feature = "std")]
132 pub fn update_network_graph(&self, update_data: &[u8]) -> Result<u32, GraphSyncError> {
133 let mut read_cursor = io::Cursor::new(update_data);
134 self.update_network_graph_from_byte_stream(&mut read_cursor)
137 /// Update network graph from binary data.
138 /// Returns the last sync timestamp to be used the next time rapid sync data is queried.
140 /// `update_data`: `&[u8]` binary stream that comprises the update data
141 /// `current_time_unix`: `Option<u64>` optional current timestamp to verify data age
142 pub fn update_network_graph_no_std(&self, update_data: &[u8], current_time_unix: Option<u64>) -> Result<u32, GraphSyncError> {
143 let mut read_cursor = io::Cursor::new(update_data);
144 self.update_network_graph_from_byte_stream_no_std(&mut read_cursor, current_time_unix)
147 /// Gets a reference to the underlying [`NetworkGraph`] which was provided in
148 /// [`RapidGossipSync::new`].
150 /// This is not exported to bindings users as bindings don't support a reference-to-a-reference yet
151 pub fn network_graph(&self) -> &NG {
155 /// Returns whether a rapid gossip sync has completed at least once.
156 pub fn is_initial_sync_complete(&self) -> bool {
157 self.is_initial_sync_complete.load(Ordering::Acquire)
161 #[cfg(feature = "std")]
166 use bitcoin::Network;
168 use lightning::ln::msgs::DecodeError;
169 use lightning::routing::gossip::NetworkGraph;
170 use lightning::util::test_utils::TestLogger;
171 use crate::RapidGossipSync;
174 fn test_sync_from_file() {
175 struct FileSyncTest {
180 fn new(tmp_directory: &str, valid_response: &[u8]) -> FileSyncTest {
181 let test = FileSyncTest { directory: tmp_directory.to_owned() };
183 let graph_sync_test_directory = test.get_test_directory();
184 fs::create_dir_all(graph_sync_test_directory).unwrap();
186 let graph_sync_test_file = test.get_test_file_path();
187 fs::write(graph_sync_test_file, valid_response).unwrap();
192 fn get_test_directory(&self) -> String {
193 self.directory.clone() + "/graph-sync-tests"
196 fn get_test_file_path(&self) -> String {
197 self.get_test_directory() + "/test_data.lngossip"
201 impl Drop for FileSyncTest {
203 fs::remove_dir_all(self.directory.clone()).unwrap();
207 // same as incremental_only_update_fails_without_prior_same_direction_updates
208 let valid_response = vec![
209 76, 68, 75, 1, 111, 226, 140, 10, 182, 241, 179, 114, 193, 166, 162, 70, 174, 99, 247,
210 79, 147, 30, 131, 101, 225, 90, 8, 156, 104, 214, 25, 0, 0, 0, 0, 0, 97, 227, 98, 218,
211 0, 0, 0, 4, 2, 22, 7, 207, 206, 25, 164, 197, 231, 230, 231, 56, 102, 61, 250, 251,
212 187, 172, 38, 46, 79, 247, 108, 44, 155, 48, 219, 238, 252, 53, 192, 6, 67, 2, 36, 125,
213 157, 176, 223, 175, 234, 116, 94, 248, 201, 225, 97, 235, 50, 47, 115, 172, 63, 136,
214 88, 216, 115, 11, 111, 217, 114, 84, 116, 124, 231, 107, 2, 158, 1, 242, 121, 152, 106,
215 204, 131, 186, 35, 93, 70, 216, 10, 237, 224, 183, 89, 95, 65, 3, 83, 185, 58, 138,
216 181, 64, 187, 103, 127, 68, 50, 2, 201, 19, 17, 138, 136, 149, 185, 226, 156, 137, 175,
217 110, 32, 237, 0, 217, 90, 31, 100, 228, 149, 46, 219, 175, 168, 77, 4, 143, 38, 128,
218 76, 97, 0, 0, 0, 2, 0, 0, 255, 8, 153, 192, 0, 2, 27, 0, 0, 0, 1, 0, 0, 255, 2, 68,
219 226, 0, 6, 11, 0, 1, 2, 3, 0, 0, 0, 2, 0, 40, 0, 0, 0, 0, 0, 0, 3, 232, 0, 0, 3, 232,
220 0, 0, 0, 1, 0, 0, 0, 0, 58, 85, 116, 216, 255, 8, 153, 192, 0, 2, 27, 0, 0, 25, 0, 0,
221 0, 1, 0, 0, 0, 125, 255, 2, 68, 226, 0, 6, 11, 0, 1, 5, 0, 0, 0, 0, 29, 129, 25, 192,
224 let tmp_directory = "./rapid-gossip-sync-tests-tmp";
225 let sync_test = FileSyncTest::new(tmp_directory, &valid_response);
226 let graph_sync_test_file = sync_test.get_test_file_path();
228 let logger = TestLogger::new();
229 let network_graph = NetworkGraph::new(Network::Bitcoin, &logger);
231 assert_eq!(network_graph.read_only().channels().len(), 0);
233 let rapid_sync = RapidGossipSync::new(&network_graph, &logger);
234 let sync_result = rapid_sync.sync_network_graph_with_file_path(&graph_sync_test_file);
236 if sync_result.is_err() {
237 panic!("Unexpected sync result: {:?}", sync_result)
240 assert_eq!(network_graph.read_only().channels().len(), 2);
241 let after = network_graph.to_string();
243 after.contains("021607cfce19a4c5e7e6e738663dfafbbbac262e4ff76c2c9b30dbeefc35c00643")
246 after.contains("02247d9db0dfafea745ef8c9e161eb322f73ac3f8858d8730b6fd97254747ce76b")
249 after.contains("029e01f279986acc83ba235d46d80aede0b7595f410353b93a8ab540bb677f4432")
252 after.contains("02c913118a8895b9e29c89af6e20ed00d95a1f64e4952edbafa84d048f26804c61")
254 assert!(after.contains("619737530008010752"));
255 assert!(after.contains("783241506229452801"));
259 fn measure_native_read_from_file() {
260 let logger = TestLogger::new();
261 let network_graph = NetworkGraph::new(Network::Bitcoin, &logger);
263 assert_eq!(network_graph.read_only().channels().len(), 0);
265 let rapid_sync = RapidGossipSync::new(&network_graph, &logger);
266 let start = std::time::Instant::now();
267 let sync_result = rapid_sync
268 .sync_network_graph_with_file_path("./res/full_graph.lngossip");
269 if let Err(crate::error::GraphSyncError::DecodeError(DecodeError::Io(io_error))) = &sync_result {
270 let error_string = format!("Input file lightning-rapid-gossip-sync/res/full_graph.lngossip is missing! Download it from https://bitcoin.ninja/ldk-compressed_graph-285cb27df79-2022-07-21.bin\n\n{:?}", io_error);
271 #[cfg(not(require_route_graph_test))]
273 println!("{}", error_string);
276 #[cfg(require_route_graph_test)]
277 panic!("{}", error_string);
279 let elapsed = start.elapsed();
280 println!("initialization duration: {:?}", elapsed);
281 if sync_result.is_err() {
282 panic!("Unexpected sync result: {:?}", sync_result)
290 use bitcoin::Network;
292 use criterion::Criterion;
296 use lightning::routing::gossip::NetworkGraph;
297 use lightning::util::test_utils::TestLogger;
299 use crate::RapidGossipSync;
302 pub fn bench_reading_full_graph_from_file(b: &mut Criterion) {
303 let logger = TestLogger::new();
304 b.bench_function("read_full_graph_from_rgs", |b| b.iter(|| {
305 let network_graph = NetworkGraph::new(Network::Bitcoin, &logger);
306 let rapid_sync = RapidGossipSync::new(&network_graph, &logger);
307 let mut file = match fs::read("../lightning-rapid-gossip-sync/res/full_graph.lngossip") {
310 let error_string = format!(
311 "Input file lightning-rapid-gossip-sync/res/full_graph.lngossip is missing! Download it from https://bitcoin.ninja/ldk-compressed_graph-bc08df7542-2022-05-05.bin\n\n{:?}",
313 #[cfg(not(require_route_graph_test))]
315 println!("{}", error_string);
318 #[cfg(require_route_graph_test)]
319 panic!("{}", error_string);
322 rapid_sync.update_network_graph_no_std(&mut file, None).unwrap();