X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning-persister%2Fsrc%2Flib.rs;h=8e7d9055a6aae014b80daf6d9280717fda1a713f;hb=b9970ff41b497bce5cba13b2bb8023368e8ea2f8;hp=6cfa540cf1ec9c32a89a13bf1ba995e8dd3808f5;hpb=34dd7c5cbbfe04a91edacfc995499a40f22e9d7c;p=rust-lightning diff --git a/lightning-persister/src/lib.rs b/lightning-persister/src/lib.rs index 6cfa540c..8e7d9055 100644 --- a/lightning-persister/src/lib.rs +++ b/lightning-persister/src/lib.rs @@ -1,366 +1,17 @@ -//! Utilities that handle persisting Rust-Lightning data to disk via standard filesystem APIs. +//! Provides utilities for LDK data persistence and retrieval. -#![deny(broken_intra_doc_links)] -#![deny(missing_docs)] - -#![cfg_attr(all(test, feature = "unstable"), feature(test))] -#[cfg(all(test, feature = "unstable"))] extern crate test; - -mod util; - -extern crate lightning; -extern crate bitcoin; -extern crate libc; - -use bitcoin::hash_types::{BlockHash, Txid}; -use bitcoin::hashes::hex::{FromHex, ToHex}; -use crate::util::DiskWriteable; -use lightning::chain; -use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator}; -use lightning::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr}; -use lightning::chain::channelmonitor; -use lightning::chain::keysinterface::{Sign, KeysInterface}; -use lightning::chain::transaction::OutPoint; -use lightning::ln::channelmanager::ChannelManager; -use lightning::util::logger::Logger; -use lightning::util::ser::{ReadableArgs, Writeable}; -use std::fs; -use std::io::{Cursor, Error}; -use std::ops::Deref; -use std::path::{Path, PathBuf}; - -/// 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, -} - -impl DiskWriteable for ChannelMonitor { - fn write_to_file(&self, writer: &mut fs::File) -> Result<(), Error> { - self.write(writer) - } -} - -impl DiskWriteable for ChannelManager -where - M::Target: chain::Watch, - T::Target: BroadcasterInterface, - K::Target: KeysInterface, - F::Target: FeeEstimator, - L::Target: Logger, -{ - fn write_to_file(&self, writer: &mut fs::File) -> Result<(), std::io::Error> { - self.write(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, - } - } +#![deny(rustdoc::broken_intra_doc_links)] +#![deny(rustdoc::private_intra_doc_links)] - /// Get the directory which was provided when this persister was initialized. - pub fn get_data_dir(&self) -> String { - self.path_to_channel_data.clone() - } - - pub(crate) fn path_to_monitor_data(&self) -> PathBuf { - let mut path = PathBuf::from(self.path_to_channel_data.clone()); - path.push("monitors"); - path - } - - /// Writes the provided `ChannelManager` to the path provided at `FilesystemPersister` - /// initialization, within a file called "manager". - pub fn persist_manager( - data_dir: String, - manager: &ChannelManager - ) -> Result<(), std::io::Error> - where - M::Target: chain::Watch, - T::Target: BroadcasterInterface, - K::Target: KeysInterface, - F::Target: FeeEstimator, - L::Target: Logger, - { - let path = PathBuf::from(data_dir); - util::write_to_file(path, "manager".to_string(), manager) - } - - /// Read `ChannelMonitor`s from disk. - pub fn read_channelmonitors ( - &self, keys_manager: K - ) -> Result)>, std::io::Error> - where K::Target: KeysInterface + Sized, - { - let path = self.path_to_monitor_data(); - if !Path::new(&path).exists() { - return Ok(Vec::new()); - } - let mut res = Vec::new(); - for file_option in fs::read_dir(path).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(std::io::Error::new( - std::io::ErrorKind::InvalidData, - "Invalid ChannelMonitor file name", - )); - } - - let txid = Txid::from_hex(filename.unwrap().split_at(64).0); - if txid.is_err() { - return Err(std::io::Error::new( - std::io::ErrorKind::InvalidData, - "Invalid tx ID in filename", - )); - } +#![deny(missing_docs)] - let index = filename.unwrap().split_at(65).1.parse(); - if index.is_err() { - return Err(std::io::Error::new( - std::io::ErrorKind::InvalidData, - "Invalid tx index in filename", - )); - } +#![cfg_attr(docsrs, feature(doc_auto_cfg))] - let contents = fs::read(&file.path())?; - let mut buffer = Cursor::new(&contents); - match <(BlockHash, ChannelMonitor)>::read(&mut buffer, &*keys_manager) { - Ok((blockhash, channel_monitor)) => { - if channel_monitor.get_funding_txo().0.txid != txid.unwrap() || channel_monitor.get_funding_txo().0.index != index.unwrap() { - return Err(std::io::Error::new(std::io::ErrorKind::InvalidData, "ChannelMonitor was stored in the wrong file")); - } - res.push((blockhash, channel_monitor)); - } - Err(e) => return Err(std::io::Error::new( - std::io::ErrorKind::InvalidData, - format!("Failed to deserialize ChannelMonitor: {}", e), - )) - } - } - Ok(res) - } -} +#[cfg(ldk_bench)] extern crate criterion; -impl channelmonitor::Persist for FilesystemPersister { - fn persist_new_channel(&self, funding_txo: OutPoint, monitor: &ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr> { - let filename = format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index); - util::write_to_file(self.path_to_monitor_data(), filename, monitor) - .map_err(|_| ChannelMonitorUpdateErr::PermanentFailure) - } +pub mod fs_store; - fn update_persisted_channel(&self, funding_txo: OutPoint, _update: &ChannelMonitorUpdate, monitor: &ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr> { - let filename = format!("{}_{}", funding_txo.txid.to_hex(), funding_txo.index); - util::write_to_file(self.path_to_monitor_data(), filename, monitor) - .map_err(|_| ChannelMonitorUpdateErr::PermanentFailure) - } -} +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 lightning::chain::channelmonitor::{Persist, ChannelMonitorUpdateErr}; - use lightning::chain::transaction::OutPoint; - use lightning::{check_closed_broadcast, check_closed_event, check_added_monitors}; - use lightning::ln::features::InitFeatures; - use lightning::ln::functional_test_utils::*; - use lightning::ln::msgs::ErrorAction; - use lightning::util::events::{ClosureReason, Event, MessageSendEventsProvider, MessageSendEvent}; - use lightning::util::test_utils; - use std::fs; - #[cfg(target_os = "windows")] - use { - lightning::get_event_msg, - lightning::ln::msgs::ChannelMessageHandler, - }; - - 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), - _ => {} - } - } - } - - // 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, &node_cfgs[0].keys_manager); - 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); - 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.read_channelmonitors(nodes[0].keys_manager).unwrap(); - assert_eq!(persisted_chan_data_0.len(), 0); - let mut persisted_chan_data_1 = persister_1.read_channelmonitors(nodes[1].keys_manager).unwrap(); - assert_eq!(persisted_chan_data_1.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.read_channelmonitors(nodes[0].keys_manager).unwrap(); - assert_eq!(persisted_chan_data_0.len(), 1); - for (_, mon) in persisted_chan_data_0.iter() { - assert_eq!(mon.get_latest_update_id(), $expected_update_id); - } - persisted_chan_data_1 = persister_1.read_channelmonitors(nodes[1].keys_manager).unwrap(); - assert_eq!(persisted_chan_data_1.len(), 1); - for (_, mon) in persisted_chan_data_1.iter() { - 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); - check_persisted_data!(5); - send_payment(&nodes[1], &vec!(&nodes[0])[..], 4000000); - 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).unwrap(); - check_closed_event!(nodes[0], 1, ClosureReason::HolderForceClosed); - check_closed_broadcast!(nodes[0], true); - 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: nodes[0].best_block_hash(), 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()]}); - check_closed_broadcast!(nodes[1], true); - check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed); - 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 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).unwrap(); - check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed); - 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).unwrap(); - check_closed_event!(nodes[1], 1, ClosureReason::HolderForceClosed); - 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(); - } -} - -#[cfg(all(test, feature = "unstable"))] -pub mod bench { - use test::Bencher; - - #[bench] - fn bench_sends(bench: &mut Bencher) { - let persister_a = super::FilesystemPersister::new("bench_filesystem_persister_a".to_string()); - let persister_b = super::FilesystemPersister::new("bench_filesystem_persister_b".to_string()); - lightning::ln::channelmanager::bench::bench_two_sends(bench, persister_a, persister_b); - } -} +mod test_utils;