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::hash_types::{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};
21 use lightning::chain::chainmonitor;
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};
28 use std::io::{Cursor, Error};
30 use std::path::{Path, PathBuf};
32 /// FilesystemPersister persists channel data on disk, where each channel's
33 /// data is stored in a file named after its funding outpoint.
35 /// Warning: this module does the best it can with calls to persist data, but it
36 /// can only guarantee that the data is passed to the drive. It is up to the
37 /// drive manufacturers to do the actual persistence properly, which they often
38 /// don't (especially on consumer-grade hardware). Therefore, it is up to the
39 /// user to validate their entire storage stack, to ensure the writes are
41 /// Corollary: especially when dealing with larger amounts of money, it is best
42 /// practice to have multiple channel data backups and not rely only on one
43 /// FilesystemPersister.
44 pub struct FilesystemPersister {
45 path_to_channel_data: String,
48 impl<Signer: Sign> DiskWriteable for ChannelMonitor<Signer> {
49 fn write_to_file(&self, writer: &mut fs::File) -> Result<(), Error> {
54 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> DiskWriteable for ChannelManager<Signer, M, T, K, F, L>
56 M::Target: chain::Watch<Signer>,
57 T::Target: BroadcasterInterface,
58 K::Target: KeysInterface<Signer=Signer>,
59 F::Target: FeeEstimator,
62 fn write_to_file(&self, writer: &mut fs::File) -> Result<(), std::io::Error> {
67 impl FilesystemPersister {
68 /// Initialize a new FilesystemPersister and set the path to the individual channels'
70 pub fn new(path_to_channel_data: String) -> Self {
76 /// Get the directory which was provided when this persister was initialized.
77 pub fn get_data_dir(&self) -> String {
78 self.path_to_channel_data.clone()
81 pub(crate) fn path_to_monitor_data(&self) -> PathBuf {
82 let mut path = PathBuf::from(self.path_to_channel_data.clone());
83 path.push("monitors");
87 /// Writes the provided `ChannelManager` to the path provided at `FilesystemPersister`
88 /// initialization, within a file called "manager".
89 pub fn persist_manager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
91 manager: &ChannelManager<Signer, M, T, K, F, L>
92 ) -> Result<(), std::io::Error>
94 M::Target: chain::Watch<Signer>,
95 T::Target: BroadcasterInterface,
96 K::Target: KeysInterface<Signer=Signer>,
97 F::Target: FeeEstimator,
100 let path = PathBuf::from(data_dir);
101 util::write_to_file(path, "manager".to_string(), manager)
104 /// Read `ChannelMonitor`s from disk.
105 pub fn read_channelmonitors<Signer: Sign, K: Deref> (
106 &self, keys_manager: K
107 ) -> Result<Vec<(BlockHash, ChannelMonitor<Signer>)>, std::io::Error>
108 where K::Target: KeysInterface<Signer=Signer> + Sized,
110 let path = self.path_to_monitor_data();
111 if !Path::new(&path).exists() {
112 return Ok(Vec::new());
114 let mut res = Vec::new();
115 for file_option in fs::read_dir(path).unwrap() {
116 let file = file_option.unwrap();
117 let owned_file_name = file.file_name();
118 let filename = owned_file_name.to_str();
119 if !filename.is_some() || !filename.unwrap().is_ascii() || filename.unwrap().len() < 65 {
120 return Err(std::io::Error::new(
121 std::io::ErrorKind::InvalidData,
122 "Invalid ChannelMonitor file name",
126 let txid = Txid::from_hex(filename.unwrap().split_at(64).0);
128 return Err(std::io::Error::new(
129 std::io::ErrorKind::InvalidData,
130 "Invalid tx ID in filename",
134 let index = filename.unwrap().split_at(65).1.parse();
136 return Err(std::io::Error::new(
137 std::io::ErrorKind::InvalidData,
138 "Invalid tx index in filename",
142 let contents = fs::read(&file.path())?;
143 let mut buffer = Cursor::new(&contents);
144 match <(BlockHash, ChannelMonitor<Signer>)>::read(&mut buffer, &*keys_manager) {
145 Ok((blockhash, channel_monitor)) => {
146 if channel_monitor.get_funding_txo().0.txid != txid.unwrap() || channel_monitor.get_funding_txo().0.index != index.unwrap() {
147 return Err(std::io::Error::new(std::io::ErrorKind::InvalidData, "ChannelMonitor was stored in the wrong file"));
149 res.push((blockhash, channel_monitor));
151 Err(e) => return Err(std::io::Error::new(
152 std::io::ErrorKind::InvalidData,
153 format!("Failed to deserialize ChannelMonitor: {}", e),
161 impl<ChannelSigner: Sign> chainmonitor::Persist<ChannelSigner> for FilesystemPersister {
162 fn persist_new_channel(&self, funding_txo: OutPoint, monitor: &ChannelMonitor<ChannelSigner>) -> Result<(), chain::ChannelMonitorUpdateErr> {
163 let filename = format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
164 util::write_to_file(self.path_to_monitor_data(), filename, monitor)
165 .map_err(|_| chain::ChannelMonitorUpdateErr::PermanentFailure)
168 fn update_persisted_channel(&self, funding_txo: OutPoint, _update: &ChannelMonitorUpdate, monitor: &ChannelMonitor<ChannelSigner>) -> Result<(), chain::ChannelMonitorUpdateErr> {
169 let filename = format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
170 util::write_to_file(self.path_to_monitor_data(), filename, monitor)
171 .map_err(|_| chain::ChannelMonitorUpdateErr::PermanentFailure)
177 extern crate lightning;
178 extern crate bitcoin;
179 use crate::FilesystemPersister;
180 use bitcoin::blockdata::block::{Block, BlockHeader};
181 use bitcoin::hashes::hex::FromHex;
183 use lightning::chain::ChannelMonitorUpdateErr;
184 use lightning::chain::chainmonitor::Persist;
185 use lightning::chain::transaction::OutPoint;
186 use lightning::{check_closed_broadcast, check_closed_event, 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::{ClosureReason, Event, 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.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.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.len(), 1);
239 for (_, mon) in persisted_chan_data_0.iter() {
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.len(), 1);
244 for (_, mon) in persisted_chan_data_1.iter() {
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);
256 check_persisted_data!(5);
257 send_payment(&nodes[1], &vec!(&nodes[0])[..], 4000000);
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_event!(nodes[0], 1, ClosureReason::HolderForceClosed);
264 check_closed_broadcast!(nodes[0], true);
265 check_added_monitors!(nodes[0], 1);
267 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
268 assert_eq!(node_txn.len(), 1);
270 let header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[0].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
271 connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[0].clone(), node_txn[0].clone()]});
272 check_closed_broadcast!(nodes[1], true);
273 check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
274 check_added_monitors!(nodes[1], 1);
276 // Make sure everything is persisted as expected after close.
277 check_persisted_data!(11);
280 // Test that if the persister's path to channel data is read-only, writing a
281 // monitor to it results in the persister returning a PermanentFailure.
282 // Windows ignores the read-only flag for folders, so this test is Unix-only.
283 #[cfg(not(target_os = "windows"))]
285 fn test_readonly_dir_perm_failure() {
286 let persister = FilesystemPersister::new("test_readonly_dir_perm_failure".to_string());
287 fs::create_dir_all(&persister.path_to_channel_data).unwrap();
289 // Set up a dummy channel and force close. This will produce a monitor
290 // that we can then use to test persistence.
291 let chanmon_cfgs = create_chanmon_cfgs(2);
292 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
293 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
294 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
295 let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
296 nodes[1].node.force_close_channel(&chan.2).unwrap();
297 check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed);
298 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
300 // Set the persister's directory to read-only, which should result in
301 // returning a permanent failure when we then attempt to persist a
303 let path = &persister.path_to_channel_data;
304 let mut perms = fs::metadata(path).unwrap().permissions();
305 perms.set_readonly(true);
306 fs::set_permissions(path, perms).unwrap();
308 let test_txo = OutPoint {
309 txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
312 match persister.persist_new_channel(test_txo, &added_monitors[0].1) {
313 Err(ChannelMonitorUpdateErr::PermanentFailure) => {},
314 _ => panic!("unexpected result from persisting new channel")
317 nodes[1].node.get_and_clear_pending_msg_events();
318 added_monitors.clear();
321 // Test that if a persister's directory name is invalid, monitor persistence
323 #[cfg(target_os = "windows")]
325 fn test_fail_on_open() {
326 // Set up a dummy channel and force close. This will produce a monitor
327 // that we can then use to test persistence.
328 let chanmon_cfgs = create_chanmon_cfgs(2);
329 let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
330 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
331 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
332 let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
333 nodes[1].node.force_close_channel(&chan.2).unwrap();
334 check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed);
335 let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
337 // Create the persister with an invalid directory name and test that the
338 // channel fails to open because the directories fail to be created. There
339 // don't seem to be invalid filename characters on Unix that Rust doesn't
340 // handle, hence why the test is Windows-only.
341 let persister = FilesystemPersister::new(":<>/".to_string());
343 let test_txo = OutPoint {
344 txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
347 match persister.persist_new_channel(test_txo, &added_monitors[0].1) {
348 Err(ChannelMonitorUpdateErr::PermanentFailure) => {},
349 _ => panic!("unexpected result from persisting new channel")
352 nodes[1].node.get_and_clear_pending_msg_events();
353 added_monitors.clear();
357 #[cfg(all(test, feature = "unstable"))]
362 fn bench_sends(bench: &mut Bencher) {
363 let persister_a = super::FilesystemPersister::new("bench_filesystem_persister_a".to_string());
364 let persister_b = super::FilesystemPersister::new("bench_filesystem_persister_b".to_string());
365 lightning::ln::channelmanager::bench::bench_two_sends(bench, persister_a, persister_b);