-extern crate lightning;
-extern crate bitcoin;
-extern crate libc;
+//! Provides utilities for LDK data persistence and retrieval.
+//
+// TODO: Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
+#![deny(broken_intra_doc_links)]
+#![deny(private_intra_doc_links)]
-use bitcoin::hashes::hex::ToHex;
-use lightning::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr};
-use lightning::chain::channelmonitor;
-use lightning::chain::keysinterface::ChannelKeys;
-use lightning::chain::transaction::OutPoint;
-use lightning::util::ser::Writeable;
-use std::fs;
-use std::io::Error;
-use std::path::{Path, PathBuf};
+#![deny(missing_docs)]
-#[cfg(test)]
-use {
- lightning::chain::keysinterface::KeysInterface,
- lightning::util::ser::ReadableArgs,
- bitcoin::{BlockHash, Txid},
- bitcoin::hashes::hex::FromHex,
- std::collections::HashMap,
- std::io::Cursor
-};
-
-#[cfg(not(target_os = "windows"))]
-use std::os::unix::io::AsRawFd;
-
-/// FilesystemPersister persists channel data on disk, where each channel's
-/// data is stored in a file named after its funding outpoint.
-///
-/// Warning: this module does the best it can with calls to persist data, but it
-/// can only guarantee that the data is passed to the drive. It is up to the
-/// drive manufacturers to do the actual persistence properly, which they often
-/// don't (especially on consumer-grade hardware). Therefore, it is up to the
-/// user to validate their entire storage stack, to ensure the writes are
-/// persistent.
-/// Corollary: especially when dealing with larger amounts of money, it is best
-/// practice to have multiple channel data backups and not rely only on one
-/// FilesystemPersister.
-pub struct FilesystemPersister {
- path_to_channel_data: String,
-}
-
-trait DiskWriteable {
- fn write(&self, writer: &mut fs::File) -> Result<(), Error>;
-}
-
-impl<ChanSigner: ChannelKeys> DiskWriteable for ChannelMonitor<ChanSigner> {
- fn write(&self, writer: &mut fs::File) -> Result<(), Error> {
- Writeable::write(self, writer)
- }
-}
-
-impl FilesystemPersister {
- /// Initialize a new FilesystemPersister and set the path to the individual channels'
- /// files.
- pub fn new(path_to_channel_data: String) -> Self {
- return Self {
- path_to_channel_data,
- }
- }
-
- fn get_full_filepath(&self, funding_txo: OutPoint) -> String {
- let mut path = PathBuf::from(&self.path_to_channel_data);
- path.push(format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index));
- path.to_str().unwrap().to_string()
- }
-
- // Utility to write a file to disk.
- fn write_channel_data(&self, funding_txo: OutPoint, monitor: &dyn DiskWriteable) -> std::io::Result<()> {
- fs::create_dir_all(&self.path_to_channel_data)?;
- // Do a crazy dance with lots of fsync()s to be overly cautious here...
- // We never want to end up in a state where we've lost the old data, or end up using the
- // old data on power loss after we've returned.
- // The way to atomically write a file on Unix platforms is:
- // open(tmpname), write(tmpfile), fsync(tmpfile), close(tmpfile), rename(), fsync(dir)
- let filename = self.get_full_filepath(funding_txo);
- let tmp_filename = format!("{}.tmp", filename.clone());
-
- {
- // Note that going by rust-lang/rust@d602a6b, on MacOS it is only safe to use
- // rust stdlib 1.36 or higher.
- let mut f = fs::File::create(&tmp_filename)?;
- monitor.write(&mut f)?;
- f.sync_all()?;
- }
- fs::rename(&tmp_filename, &filename)?;
- // Fsync the parent directory on Unix.
- #[cfg(not(target_os = "windows"))]
- {
- let path = Path::new(&filename).parent().unwrap();
- let dir_file = fs::OpenOptions::new().read(true).open(path)?;
- unsafe { libc::fsync(dir_file.as_raw_fd()); }
- }
- Ok(())
- }
-
- #[cfg(test)]
- fn load_channel_data<Keys: KeysInterface>(&self, keys: &Keys) ->
- Result<HashMap<OutPoint, ChannelMonitor<Keys::ChanKeySigner>>, ChannelMonitorUpdateErr> {
- if let Err(_) = fs::create_dir_all(&self.path_to_channel_data) {
- return Err(ChannelMonitorUpdateErr::PermanentFailure);
- }
- let mut res = HashMap::new();
- for file_option in fs::read_dir(&self.path_to_channel_data).unwrap() {
- let file = file_option.unwrap();
- let owned_file_name = file.file_name();
- let filename = owned_file_name.to_str();
- if !filename.is_some() || !filename.unwrap().is_ascii() || filename.unwrap().len() < 65 {
- return Err(ChannelMonitorUpdateErr::PermanentFailure);
- }
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
- let txid = Txid::from_hex(filename.unwrap().split_at(64).0);
- if txid.is_err() { return Err(ChannelMonitorUpdateErr::PermanentFailure); }
+#[cfg(ldk_bench)] extern crate criterion;
- let index = filename.unwrap().split_at(65).1.split('.').next().unwrap().parse();
- if index.is_err() { return Err(ChannelMonitorUpdateErr::PermanentFailure); }
+pub mod fs_store;
- let contents = fs::read(&file.path());
- if contents.is_err() { return Err(ChannelMonitorUpdateErr::PermanentFailure); }
-
- if let Ok((_, loaded_monitor)) =
- <(BlockHash, ChannelMonitor<Keys::ChanKeySigner>)>::read(&mut Cursor::new(&contents.unwrap()), keys) {
- res.insert(OutPoint { txid: txid.unwrap(), index: index.unwrap() }, loaded_monitor);
- } else {
- return Err(ChannelMonitorUpdateErr::PermanentFailure);
- }
- }
- Ok(res)
- }
-}
-
-impl<ChanSigner: ChannelKeys + Send + Sync> channelmonitor::Persist<ChanSigner> for FilesystemPersister {
- fn persist_new_channel(&self, funding_txo: OutPoint, monitor: &ChannelMonitor<ChanSigner>) -> Result<(), ChannelMonitorUpdateErr> {
- self.write_channel_data(funding_txo, monitor)
- .map_err(|_| ChannelMonitorUpdateErr::PermanentFailure)
- }
-
- fn update_persisted_channel(&self, funding_txo: OutPoint, _update: &ChannelMonitorUpdate, monitor: &ChannelMonitor<ChanSigner>) -> Result<(), ChannelMonitorUpdateErr> {
- self.write_channel_data(funding_txo, monitor)
- .map_err(|_| ChannelMonitorUpdateErr::PermanentFailure)
- }
-}
-
-#[cfg(test)]
-impl Drop for FilesystemPersister {
- fn drop(&mut self) {
- // We test for invalid directory names, so it's OK if directory removal
- // fails.
- match fs::remove_dir_all(&self.path_to_channel_data) {
- Err(e) => println!("Failed to remove test persister directory: {}", e),
- _ => {}
- }
- }
-}
+mod utils;
#[cfg(test)]
-mod tests {
- extern crate lightning;
- extern crate bitcoin;
- use crate::FilesystemPersister;
- use bitcoin::blockdata::block::{Block, BlockHeader};
- use bitcoin::hashes::hex::FromHex;
- use bitcoin::Txid;
- use DiskWriteable;
- use Error;
- use lightning::chain::channelmonitor::{Persist, ChannelMonitorUpdateErr};
- use lightning::chain::transaction::OutPoint;
- use lightning::{check_closed_broadcast, check_added_monitors};
- use lightning::ln::features::InitFeatures;
- use lightning::ln::functional_test_utils::*;
- use lightning::ln::msgs::ErrorAction;
- use lightning::util::events::{MessageSendEventsProvider, MessageSendEvent};
- use lightning::util::ser::Writer;
- use lightning::util::test_utils;
- use std::fs;
- use std::io;
- #[cfg(target_os = "windows")]
- use {
- lightning::get_event_msg,
- lightning::ln::msgs::ChannelMessageHandler,
- };
-
- struct TestWriteable{}
- impl DiskWriteable for TestWriteable {
- fn write(&self, writer: &mut fs::File) -> Result<(), Error> {
- writer.write_all(&[42; 1])
- }
- }
-
- // Integration-test the FilesystemPersister. Test relaying a few payments
- // and check that the persisted data is updated the appropriate number of
- // times.
- #[test]
- fn test_filesystem_persister() {
- // Create the nodes, giving them FilesystemPersisters for data persisters.
- let persister_0 = FilesystemPersister::new("test_filesystem_persister_0".to_string());
- let persister_1 = FilesystemPersister::new("test_filesystem_persister_1".to_string());
- let chanmon_cfgs = create_chanmon_cfgs(2);
- let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
- 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);
- 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[0].chain_monitor = chain_mon_0;
- node_cfgs[1].chain_monitor = chain_mon_1;
- let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
- let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
-
- // Check that the persisted channel data is empty before any channels are
- // open.
- let mut persisted_chan_data_0 = persister_0.load_channel_data(nodes[0].keys_manager).unwrap();
- assert_eq!(persisted_chan_data_0.keys().len(), 0);
- let mut persisted_chan_data_1 = persister_1.load_channel_data(nodes[1].keys_manager).unwrap();
- assert_eq!(persisted_chan_data_1.keys().len(), 0);
-
- // Helper to make sure the channel is on the expected update ID.
- macro_rules! check_persisted_data {
- ($expected_update_id: expr) => {
- persisted_chan_data_0 = persister_0.load_channel_data(nodes[0].keys_manager).unwrap();
- assert_eq!(persisted_chan_data_0.keys().len(), 1);
- for mon in persisted_chan_data_0.values() {
- assert_eq!(mon.get_latest_update_id(), $expected_update_id);
- }
- persisted_chan_data_1 = persister_1.load_channel_data(nodes[1].keys_manager).unwrap();
- assert_eq!(persisted_chan_data_1.keys().len(), 1);
- for mon in persisted_chan_data_1.values() {
- assert_eq!(mon.get_latest_update_id(), $expected_update_id);
- }
- }
- }
-
- // Create some initial channel and check that a channel was persisted.
- let _ = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
- check_persisted_data!(0);
-
- // Send a few payments and make sure the monitors are updated to the latest.
- send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
- check_persisted_data!(5);
- send_payment(&nodes[1], &vec!(&nodes[0])[..], 4000000, 4_000_000);
- check_persisted_data!(10);
-
- // Force close because cooperative close doesn't result in any persisted
- // updates.
- nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id);
- check_closed_broadcast!(nodes[0], false);
- check_added_monitors!(nodes[0], 1);
-
- let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
- assert_eq!(node_txn.len(), 1);
-
- let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
- connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[0].clone(), node_txn[0].clone()]}, 1);
- check_closed_broadcast!(nodes[1], false);
- check_added_monitors!(nodes[1], 1);
-
- // Make sure everything is persisted as expected after close.
- check_persisted_data!(11);
- }
-
- // Test that if the persister's path to channel data is read-only, writing
- // data to it fails. Windows ignores the read-only flag for folders, so this
- // test is Unix-only.
- #[cfg(not(target_os = "windows"))]
- #[test]
- fn test_readonly_dir() {
- let persister = FilesystemPersister::new("test_readonly_dir_persister".to_string());
- let test_writeable = TestWriteable{};
- let test_txo = OutPoint {
- txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
- index: 0
- };
- // Create the persister's directory and set it to read-only.
- let path = &persister.path_to_channel_data;
- fs::create_dir_all(path).unwrap();
- let mut perms = fs::metadata(path).unwrap().permissions();
- perms.set_readonly(true);
- fs::set_permissions(path, perms).unwrap();
- match persister.write_channel_data(test_txo, &test_writeable) {
- Err(e) => assert_eq!(e.kind(), io::ErrorKind::PermissionDenied),
- _ => panic!("Unexpected error message")
- }
- }
-
- // Test failure to rename in the process of atomically creating a channel
- // monitor's file. We induce this failure by making the `tmp` file a
- // directory.
- // Explanation: given "from" = the file being renamed, "to" = the
- // renamee that already exists: Windows should fail because it'll fail
- // whenever "to" is a directory, and Unix should fail because if "from" is a
- // file, then "to" is also required to be a file.
- #[test]
- fn test_rename_failure() {
- let persister = FilesystemPersister::new("test_rename_failure".to_string());
- let test_writeable = TestWriteable{};
- let txid_hex = "8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be";
- let outp_idx = 0;
- let test_txo = OutPoint {
- txid: Txid::from_hex(txid_hex).unwrap(),
- index: outp_idx,
- };
- // Create the channel data file and make it a directory.
- let path = &persister.path_to_channel_data;
- fs::create_dir_all(format!("{}/{}_{}", path, txid_hex, outp_idx)).unwrap();
- match persister.write_channel_data(test_txo, &test_writeable) {
- Err(e) => {
- #[cfg(not(target_os = "windows"))]
- assert_eq!(e.kind(), io::ErrorKind::Other);
- #[cfg(target_os = "windows")]
- assert_eq!(e.kind(), io::ErrorKind::PermissionDenied);
- }
- _ => panic!("Unexpected error message")
- }
- }
-
- // Test failure to create the temporary file in the persistence process.
- // We induce this failure by having the temp file already exist and be a
- // directory.
- #[test]
- fn test_tmp_file_creation_failure() {
- let persister = FilesystemPersister::new("test_tmp_file_creation_failure".to_string());
- let test_writeable = TestWriteable{};
- let txid_hex = "8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be";
- let outp_idx = 0;
- let test_txo = OutPoint {
- txid: Txid::from_hex(txid_hex).unwrap(),
- index: outp_idx,
- };
- // Create the tmp file and make it a directory.
- let path = &persister.path_to_channel_data;
- fs::create_dir_all(format!("{}/{}_{}.tmp", path, txid_hex, outp_idx)).unwrap();
- match persister.write_channel_data(test_txo, &test_writeable) {
- Err(e) => {
- #[cfg(not(target_os = "windows"))]
- assert_eq!(e.kind(), io::ErrorKind::Other);
- #[cfg(target_os = "windows")]
- assert_eq!(e.kind(), io::ErrorKind::PermissionDenied);
- }
- _ => panic!("Unexpected error message")
- }
- }
-
- // Test that if the persister's path to channel data is read-only, writing a
- // monitor to it results in the persister returning a PermanentFailure.
- // Windows ignores the read-only flag for folders, so this test is Unix-only.
- #[cfg(not(target_os = "windows"))]
- #[test]
- fn test_readonly_dir_perm_failure() {
- let persister = FilesystemPersister::new("test_readonly_dir_perm_failure".to_string());
- fs::create_dir_all(&persister.path_to_channel_data).unwrap();
-
- // Set up a dummy channel and force close. This will produce a monitor
- // that we can then use to test persistence.
- let chanmon_cfgs = create_chanmon_cfgs(2);
- let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
- let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
- let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
- let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
- nodes[1].node.force_close_channel(&chan.2);
- let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
-
- // Set the persister's directory to read-only, which should result in
- // returning a permanent failure when we then attempt to persist a
- // channel update.
- let path = &persister.path_to_channel_data;
- let mut perms = fs::metadata(path).unwrap().permissions();
- perms.set_readonly(true);
- fs::set_permissions(path, perms).unwrap();
-
- let test_txo = OutPoint {
- txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
- index: 0
- };
- match persister.persist_new_channel(test_txo, &added_monitors[0].1) {
- Err(ChannelMonitorUpdateErr::PermanentFailure) => {},
- _ => panic!("unexpected result from persisting new channel")
- }
-
- nodes[1].node.get_and_clear_pending_msg_events();
- added_monitors.clear();
- }
-
- // Test that if a persister's directory name is invalid, monitor persistence
- // will fail.
- #[cfg(target_os = "windows")]
- #[test]
- fn test_fail_on_open() {
- // Set up a dummy channel and force close. This will produce a monitor
- // that we can then use to test persistence.
- let chanmon_cfgs = create_chanmon_cfgs(2);
- let mut node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
- let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
- let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
- let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
- nodes[1].node.force_close_channel(&chan.2);
- let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap();
-
- // Create the persister with an invalid directory name and test that the
- // channel fails to open because the directories fail to be created. There
- // don't seem to be invalid filename characters on Unix that Rust doesn't
- // handle, hence why the test is Windows-only.
- let persister = FilesystemPersister::new(":<>/".to_string());
-
- let test_txo = OutPoint {
- txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(),
- index: 0
- };
- match persister.persist_new_channel(test_txo, &added_monitors[0].1) {
- Err(ChannelMonitorUpdateErr::PermanentFailure) => {},
- _ => panic!("unexpected result from persisting new channel")
- }
-
- nodes[1].node.get_and_clear_pending_msg_events();
- added_monitors.clear();
- }
-}
+mod test_utils;