_ Git - rust-lightning/blob - lightning/src/util/persist.rs

   1 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   2 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   3 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   4 // You may not use this file except in accordance with one or both of these
   5 // licenses.
   6
   7 //! This module contains a simple key-value store trait KVStorePersister that
   8 //! allows one to implement the persistence for [`ChannelManager`], [`NetworkGraph`],
   9 //! and [`ChannelMonitor`] all in one place.
  10
  11 use core::ops::Deref;
  12 use bitcoin::hashes::hex::ToHex;
  13 use crate::io;
  14 use crate::routing::scoring::WriteableScore;
  15
  16 use crate::chain;
  17 use crate::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
  18 use crate::chain::chainmonitor::{Persist, MonitorUpdateId};
  19 use crate::chain::keysinterface::{Sign, KeysInterface};
  20 use crate::chain::transaction::OutPoint;
  21 use crate::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate};
  22 use crate::ln::channelmanager::ChannelManager;
  23 use crate::routing::gossip::NetworkGraph;
  24 use super::{logger::Logger, ser::Writeable};
  25
  26 /// Trait for a key-value store for persisting some writeable object at some key
  27 /// Implementing `KVStorePersister` provides auto-implementations for [`Persister`]
  28 /// and [`Persist`] traits.  It uses "manager", "network_graph",
  29 /// and "monitors/{funding_txo_id}_{funding_txo_index}" for keys.
  30 pub trait KVStorePersister {
  31         /// Persist the given writeable using the provided key
  32         fn persist<W: Writeable>(&self, key: &str, object: &W) -> io::Result<()>;
  33 }
  34
  35 /// Trait that handles persisting a [`ChannelManager`], [`NetworkGraph`], and [`WriteableScore`] to disk.
  36 pub trait Persister<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref, S: WriteableScore<'a>>
  37         where M::Target: 'static + chain::Watch<<K::Target as KeysInterface>::Signer>,
  38                 T::Target: 'static + BroadcasterInterface,
  39                 K::Target: 'static + KeysInterface,
  40                 F::Target: 'static + FeeEstimator,
  41                 L::Target: 'static + Logger,
  42 {
  43         /// Persist the given ['ChannelManager'] to disk, returning an error if persistence failed.
  44         fn persist_manager(&self, channel_manager: &ChannelManager<M, T, K, F, L>) -> Result<(), io::Error>;
  45
  46         /// Persist the given [`NetworkGraph`] to disk, returning an error if persistence failed.
  47         fn persist_graph(&self, network_graph: &NetworkGraph<L>) -> Result<(), io::Error>;
  48
  49         /// Persist the given [`WriteableScore`] to disk, returning an error if persistence failed.
  50         fn persist_scorer(&self, scorer: &S) -> Result<(), io::Error>;
  51 }
  52
  53 impl<'a, A: KVStorePersister, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref, S: WriteableScore<'a>> Persister<'a, M, T, K, F, L, S> for A
  54         where M::Target: 'static + chain::Watch<<K::Target as KeysInterface>::Signer>,
  55                 T::Target: 'static + BroadcasterInterface,
  56                 K::Target: 'static + KeysInterface,
  57                 F::Target: 'static + FeeEstimator,
  58                 L::Target: 'static + Logger,
  59 {
  60         /// Persist the given ['ChannelManager'] to disk with the name "manager", returning an error if persistence failed.
  61         fn persist_manager(&self, channel_manager: &ChannelManager<M, T, K, F, L>) -> Result<(), io::Error> {
  62                 self.persist("manager", channel_manager)
  63         }
  64
  65         /// Persist the given [`NetworkGraph`] to disk with the name "network_graph", returning an error if persistence failed.
  66         fn persist_graph(&self, network_graph: &NetworkGraph<L>) -> Result<(), io::Error> {
  67                 self.persist("network_graph", network_graph)
  68         }
  69
  70         /// Persist the given [`WriteableScore`] to disk with name "scorer", returning an error if persistence failed.
  71         fn persist_scorer(&self, scorer: &S) -> Result<(), io::Error> {
  72                 self.persist("scorer", &scorer)
  73         }
  74 }
  75
  76 impl<ChannelSigner: Sign, K: KVStorePersister> Persist<ChannelSigner> for K {
  77         // TODO: We really need a way for the persister to inform the user that its time to crash/shut
  78         // down once these start returning failure.
  79         // A PermanentFailure implies we should probably just shut down the node since we're
  80         // force-closing channels without even broadcasting!
  81
  82         fn persist_new_channel(&self, funding_txo: OutPoint, monitor: &ChannelMonitor<ChannelSigner>, _update_id: MonitorUpdateId) -> chain::ChannelMonitorUpdateStatus {
  83                 let key = format!("monitors/{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
  84                 match self.persist(&key, monitor) {
  85                         Ok(()) => chain::ChannelMonitorUpdateStatus::Completed,
  86                         Err(_) => chain::ChannelMonitorUpdateStatus::PermanentFailure,
  87                 }
  88         }
  89
  90         fn update_persisted_channel(&self, funding_txo: OutPoint, _update: &Option<ChannelMonitorUpdate>, monitor: &ChannelMonitor<ChannelSigner>, _update_id: MonitorUpdateId) -> chain::ChannelMonitorUpdateStatus {
  91                 let key = format!("monitors/{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
  92                 match self.persist(&key, monitor) {
  93                         Ok(()) => chain::ChannelMonitorUpdateStatus::Completed,
  94                         Err(_) => chain::ChannelMonitorUpdateStatus::PermanentFailure,
  95                 }
  96         }
  97 }