1 //! Utilities that handle persisting Rust-Lightning data to disk via standard filesystem APIs.
3 #![deny(broken_intra_doc_links)]
6 #![cfg_attr(all(test, feature = "unstable"), feature(test))]
7 #[cfg(all(test, feature = "unstable"))] extern crate test;
11 extern crate lightning;
15 use bitcoin::{BlockHash, Txid};
16 use bitcoin::hashes::hex::{FromHex, ToHex};
17 use crate::util::DiskWriteable;
19 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
20 use lightning::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr};
21 use lightning::chain::channelmonitor;
22 use lightning::chain::keysinterface::{Sign, KeysInterface};
23 use lightning::chain::transaction::OutPoint;
24 use lightning::ln::channelmanager::ChannelManager;
25 use lightning::util::logger::Logger;
26 use lightning::util::ser::{ReadableArgs, Writeable};
27 use std::collections::HashMap;
29 use std::io::{Cursor, Error};
31 use std::path::{Path, PathBuf};
34 /// FilesystemPersister persists channel data on disk, where each channel's
35 /// data is stored in a file named after its funding outpoint.
37 /// Warning: this module does the best it can with calls to persist data, but it
38 /// can only guarantee that the data is passed to the drive. It is up to the
39 /// drive manufacturers to do the actual persistence properly, which they often
40 /// don't (especially on consumer-grade hardware). Therefore, it is up to the
41 /// user to validate their entire storage stack, to ensure the writes are
43 /// Corollary: especially when dealing with larger amounts of money, it is best
44 /// practice to have multiple channel data backups and not rely only on one
45 /// FilesystemPersister.
46 pub struct FilesystemPersister {
47 path_to_channel_data: String,
50 impl<Signer: Sign> DiskWriteable for ChannelMonitor<Signer> {
51 fn write_to_file(&self, writer: &mut fs::File) -> Result<(), Error> {
56 impl<Signer: Sign, M, T, K, F, L> DiskWriteable for ChannelManager<Signer, Arc<M>, Arc<T>, Arc<K>, Arc<F>, Arc<L>>
57 where M: chain::Watch<Signer>,
58 T: BroadcasterInterface,
59 K: KeysInterface<Signer=Signer>,
63 fn write_to_file(&self, writer: &mut fs::File) -> Result<(), std::io::Error> {
68 impl FilesystemPersister {
69 /// Initialize a new FilesystemPersister and set the path to the individual channels'
71 pub fn new(path_to_channel_data: String) -> Self {
77 /// Get the directory which was provided when this persister was initialized.
78 pub fn get_data_dir(&self) -> String {
79 self.path_to_channel_data.clone()
82 pub(crate) fn path_to_monitor_data(&self) -> PathBuf {
83 let mut path = PathBuf::from(self.path_to_channel_data.clone());
84 path.push("monitors");
88 /// Writes the provided `ChannelManager` to the path provided at `FilesystemPersister`
89 /// initialization, within a file called "manager".
90 pub fn persist_manager<Signer, M, T, K, F, L>(
92 manager: &ChannelManager<Signer, Arc<M>, Arc<T>, Arc<K>, Arc<F>, Arc<L>>
93 ) -> Result<(), std::io::Error>
95 M: chain::Watch<Signer>,
96 T: BroadcasterInterface,
97 K: KeysInterface<Signer=Signer>,
101 let path = PathBuf::from(data_dir);
102 util::write_to_file(path, "manager".to_string(), manager)
105 /// Read `ChannelMonitor`s from disk.
106 pub fn read_channelmonitors<Signer: Sign, K: Deref> (
107 &self, keys_manager: K
108 ) -> Result<HashMap<OutPoint, (BlockHash, ChannelMonitor<Signer>)>, std::io::Error>
109 where K::Target: KeysInterface<Signer=Signer> + Sized
111 let path = self.path_to_monitor_data();
112 if !Path::new(&path).exists() {
113 return Ok(HashMap::new());
115 let mut outpoint_to_channelmonitor = HashMap::new();
116 for file_option in fs::read_dir(path).unwrap() {
117 let file = file_option.unwrap();
118 let owned_file_name = file.file_name();
119 let filename = owned_file_name.to_str();
120 if !filename.is_some() || !filename.unwrap().is_ascii() || filename.unwrap().len() < 65 {
121 return Err(std::io::Error::new(
122 std::io::ErrorKind::InvalidData,
123 "Invalid ChannelMonitor file name",
127 let txid = Txid::from_hex(filename.unwrap().split_at(64).0);
129 return Err(std::io::Error::new(
130 std::io::ErrorKind::InvalidData,
131 "Invalid tx ID in filename",
135 let index = filename.unwrap().split_at(65).1.parse();
137 return Err(std::io::Error::new(
138 std::io::ErrorKind::InvalidData,
139 "Invalid tx index in filename",
143 let contents = fs::read(&file.path())?;
144 let mut buffer = Cursor::new(&contents);
145 match <(BlockHash, ChannelMonitor<Signer>)>::read(&mut buffer, &*keys_manager) {
146 Ok((blockhash, channel_monitor)) => {
147 outpoint_to_channelmonitor.insert(
148 OutPoint { txid: txid.unwrap(), index: index.unwrap() },
149 (blockhash, channel_monitor),
152 Err(e) => return Err(std::io::Error::new(
153 std::io::ErrorKind::InvalidData,
154 format!("Failed to deserialize ChannelMonitor: {}", e),
158 Ok(outpoint_to_channelmonitor)
162 impl<ChannelSigner: Sign> channelmonitor::Persist<ChannelSigner> for FilesystemPersister {
163 fn persist_new_channel(&self, funding_txo: OutPoint, monitor: &ChannelMonitor<ChannelSigner>) -> Result<(), ChannelMonitorUpdateErr> {
164 let filename = format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
165 util::write_to_file(self.path_to_monitor_data(), filename, monitor)
166 .map_err(|_| ChannelMonitorUpdateErr::PermanentFailure)
169 fn update_persisted_channel(&self, funding_txo: OutPoint, _update: &ChannelMonitorUpdate, monitor: &ChannelMonitor<ChannelSigner>) -> Result<(), ChannelMonitorUpdateErr> {
170 let filename = format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
171 util::write_to_file(self.path_to_monitor_data(), filename, monitor)
172 .map_err(|_| ChannelMonitorUpdateErr::PermanentFailure)
178 extern crate lightning;
179 extern crate bitcoin;
180 use crate::FilesystemPersister;
181 use bitcoin::blockdata::block::{Block, BlockHeader};
182 use bitcoin::hashes::hex::FromHex;
184 use lightning::chain::channelmonitor::{Persist, ChannelMonitorUpdateErr};
185 use lightning::chain::transaction::OutPoint;
186 use lightning::{check_closed_broadcast, check_added_monitors};
187 use lightning::ln::features::InitFeatures;
188 use lightning::ln::functional_test_utils::*;
189 use lightning::ln::msgs::ErrorAction;
190 use lightning::util::events::{MessageSendEventsProvider, MessageSendEvent};
191 use lightning::util::test_utils;
193 #[cfg(target_os = "windows")]
195 lightning::get_event_msg,
196 lightning::ln::msgs::ChannelMessageHandler,
199 impl Drop for FilesystemPersister {
201 // We test for invalid directory names, so it's OK if directory removal
203 match fs::remove_dir_all(&self.path_to_channel_data) {
204 Err(e) => println!("Failed to remove test persister directory: {}", e),
210 // Integration-test the FilesystemPersister. Test relaying a few payments
211 // and check that the persisted data is updated the appropriate number of
214 fn test_filesystem_persister() {
215 // Create the nodes, giving them FilesystemPersisters for data persisters.
216 let persister_0 = FilesystemPersister::new("test_filesystem_persister_0".to_string());
217 let persister_1 = FilesystemPersister::new("test_filesystem_persister_1".to_string());
218 let chanmon_cfgs = create_chanmon_cfgs(2);
219 let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
220 let chain_mon_0 = test_utils::TestChainMonitor::new(Some(&chanmon_cfgs[0].chain_source), &chanmon_cfgs[0].tx_broadcaster, &chanmon_cfgs[0].logger, &chanmon_cfgs[0].fee_estimator, &persister_0, &node_cfgs[0].keys_manager);
221 let chain_mon_1 = test_utils::TestChainMonitor::new(Some(&chanmon_cfgs[1].chain_source), &chanmon_cfgs[1].tx_broadcaster, &chanmon_cfgs[1].logger, &chanmon_cfgs[1].fee_estimator, &persister_1, &node_cfgs[1].keys_manager);
222 node_cfgs[0].chain_monitor = chain_mon_0;
223 node_cfgs[1].chain_monitor = chain_mon_1;
224 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
225 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
227 // Check that the persisted channel data is empty before any channels are
229 let mut persisted_chan_data_0 = persister_0.read_channelmonitors(nodes[0].keys_manager).unwrap();
230 assert_eq!(persisted_chan_data_0.keys().len(), 0);
231 let mut persisted_chan_data_1 = persister_1.read_channelmonitors(nodes[1].keys_manager).unwrap();
232 assert_eq!(persisted_chan_data_1.keys().len(), 0);
234 // Helper to make sure the channel is on the expected update ID.
235 macro_rules! check_persisted_data {
236 ($expected_update_id: expr) => {
237 persisted_chan_data_0 = persister_0.read_channelmonitors(nodes[0].keys_manager).unwrap();
238 assert_eq!(persisted_chan_data_0.keys().len(), 1);
239 for (_, mon) in persisted_chan_data_0.values() {
240 assert_eq!(mon.get_latest_update_id(), $expected_update_id);
242 persisted_chan_data_1 = persister_1.read_channelmonitors(nodes[1].keys_manager).unwrap();
243 assert_eq!(persisted_chan_data_1.keys().len(), 1);
244 for (_, mon) in persisted_chan_data_1.values() {
245 assert_eq!(mon.get_latest_update_id(), $expected_update_id);
250 // Create some initial channel and check that a channel was persisted.
251 let _ = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
252 check_persisted_data!(0);
254 // Send a few payments and make sure the monitors are updated to the latest.
255 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
256 check_persisted_data!(5);
257 send_payment(&nodes[1], &vec!(&nodes[0])[..], 4000000, 4_000_000);
258 check_persisted_data!(10);
260 // Force close because cooperative close doesn't result in any persisted
262 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
263 check_closed_broadcast!(nodes[0], true);
264 check_added_monitors!(nodes[0], 1);
266 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
267 assert_eq!(node_txn.len(), 1);
269 let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
270 connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[0].clone(), node_txn[0].clone()]});
271 check_closed_broadcast!(nodes[1], true);
272 check_added_monitors!(nodes[1], 1);
274 // Make sure everything is persisted as expected after close.
275 check_persisted_data!(11);
278 // Test that if the persister's path to channel data is read-only, writing a
279 // monitor to it results in the persister returning a PermanentFailure.
280 // Windows ignores the read-only flag for folders, so this test is Unix-only.
281 #[cfg(not(target_os = "windows"))]
283 fn test_readonly_dir_perm_failure() {
284 let persister = FilesystemPersister::new("test_readonly_dir_perm_failure".to_string());
285 fs::create_dir_all(&persister.path_to_channel_data).unwrap();
287 // Set up a dummy channel and force close. This will produce a monitor
288 // that we can then use to test persistence.
289 let chanmon_cfgs = create_chanmon_cfgs(2);
290 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
291 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
292 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
293 let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
294 nodes[1].node.force_close_channel(&chan.2).unwrap();
295 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
297 // Set the persister's directory to read-only, which should result in
298 // returning a permanent failure when we then attempt to persist a
300 let path = &persister.path_to_channel_data;
301 let mut perms = fs::metadata(path).unwrap().permissions();
302 perms.set_readonly(true);
303 fs::set_permissions(path, perms).unwrap();
305 let test_txo = OutPoint {
306 txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
309 match persister.persist_new_channel(test_txo, &added_monitors[0].1) {
310 Err(ChannelMonitorUpdateErr::PermanentFailure) => {},
311 _ => panic!("unexpected result from persisting new channel")
314 nodes[1].node.get_and_clear_pending_msg_events();
315 added_monitors.clear();
318 // Test that if a persister's directory name is invalid, monitor persistence
320 #[cfg(target_os = "windows")]
322 fn test_fail_on_open() {
323 // Set up a dummy channel and force close. This will produce a monitor
324 // that we can then use to test persistence.
325 let chanmon_cfgs = create_chanmon_cfgs(2);
326 let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
327 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
328 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
329 let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
330 nodes[1].node.force_close_channel(&chan.2).unwrap();
331 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
333 // Create the persister with an invalid directory name and test that the
334 // channel fails to open because the directories fail to be created. There
335 // don't seem to be invalid filename characters on Unix that Rust doesn't
336 // handle, hence why the test is Windows-only.
337 let persister = FilesystemPersister::new(":<>/".to_string());
339 let test_txo = OutPoint {
340 txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
343 match persister.persist_new_channel(test_txo, &added_monitors[0].1) {
344 Err(ChannelMonitorUpdateErr::PermanentFailure) => {},
345 _ => panic!("unexpected result from persisting new channel")
348 nodes[1].node.get_and_clear_pending_msg_events();
349 added_monitors.clear();
353 #[cfg(all(test, feature = "unstable"))]
358 fn bench_sends(bench: &mut Bencher) {
359 let persister_a = super::FilesystemPersister::new("bench_filesystem_persister_a".to_string());
360 let persister_b = super::FilesystemPersister::new("bench_filesystem_persister_b".to_string());
361 lightning::ln::channelmanager::bench::bench_two_sends(bench, persister_a, persister_b);