git.bitcoin.ninja 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::{EntropySource, NodeSigner, WriteableEcdsaChannelSigner, SignerProvider};
  20 use crate::chain::transaction::OutPoint;
  21 use crate::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate};
  22 use crate::ln::channelmanager::ChannelManager;
  23 use crate::routing::router::Router;
  24 use crate::routing::gossip::NetworkGraph;
  25 use super::{logger::Logger, ser::Writeable};
  26
  27 /// Trait for a key-value store for persisting some writeable object at some key
  28 /// Implementing `KVStorePersister` provides auto-implementations for [`Persister`]
  29 /// and [`Persist`] traits.  It uses "manager", "network_graph",
  30 /// and "monitors/{funding_txo_id}_{funding_txo_index}" for keys.
  31 pub trait KVStorePersister {
  32         /// Persist the given writeable using the provided key
  33         fn persist<W: Writeable>(&self, key: &str, object: &W) -> io::Result<()>;
  34 }
  35
  36 /// Trait that handles persisting a [`ChannelManager`], [`NetworkGraph`], and [`WriteableScore`] to disk.
  37 pub trait Persister<'a, M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref, S: WriteableScore<'a>>
  38         where M::Target: 'static + chain::Watch<<SP::Target as SignerProvider>::Signer>,
  39                 T::Target: 'static + BroadcasterInterface,
  40                 ES::Target: 'static + EntropySource,
  41                 NS::Target: 'static + NodeSigner,
  42                 SP::Target: 'static + SignerProvider,
  43                 F::Target: 'static + FeeEstimator,
  44                 R::Target: 'static + Router,
  45                 L::Target: 'static + Logger,
  46 {
  47         /// Persist the given ['ChannelManager'] to disk, returning an error if persistence failed.
  48         fn persist_manager(&self, channel_manager: &ChannelManager<M, T, ES, NS, SP, F, R, L>) -> Result<(), io::Error>;
  49
  50         /// Persist the given [`NetworkGraph`] to disk, returning an error if persistence failed.
  51         fn persist_graph(&self, network_graph: &NetworkGraph<L>) -> Result<(), io::Error>;
  52
  53         /// Persist the given [`WriteableScore`] to disk, returning an error if persistence failed.
  54         fn persist_scorer(&self, scorer: &S) -> Result<(), io::Error>;
  55 }
  56
  57 impl<'a, A: KVStorePersister, M: Deref, T: Deref, ES: Deref, NS: Deref, SP: Deref, F: Deref, R: Deref, L: Deref, S: WriteableScore<'a>> Persister<'a, M, T, ES, NS, SP, F, R, L, S> for A
  58         where M::Target: 'static + chain::Watch<<SP::Target as SignerProvider>::Signer>,
  59                 T::Target: 'static + BroadcasterInterface,
  60                 ES::Target: 'static + EntropySource,
  61                 NS::Target: 'static + NodeSigner,
  62                 SP::Target: 'static + SignerProvider,
  63                 F::Target: 'static + FeeEstimator,
  64                 R::Target: 'static + Router,
  65                 L::Target: 'static + Logger,
  66 {
  67         /// Persist the given ['ChannelManager'] to disk with the name "manager", returning an error if persistence failed.
  68         fn persist_manager(&self, channel_manager: &ChannelManager<M, T, ES, NS, SP, F, R, L>) -> Result<(), io::Error> {
  69                 self.persist("manager", channel_manager)
  70         }
  71
  72         /// Persist the given [`NetworkGraph`] to disk with the name "network_graph", returning an error if persistence failed.
  73         fn persist_graph(&self, network_graph: &NetworkGraph<L>) -> Result<(), io::Error> {
  74                 self.persist("network_graph", network_graph)
  75         }
  76
  77         /// Persist the given [`WriteableScore`] to disk with name "scorer", returning an error if persistence failed.
  78         fn persist_scorer(&self, scorer: &S) -> Result<(), io::Error> {
  79                 self.persist("scorer", &scorer)
  80         }
  81 }
  82
  83 impl<ChannelSigner: WriteableEcdsaChannelSigner, K: KVStorePersister> Persist<ChannelSigner> for K {
  84         // TODO: We really need a way for the persister to inform the user that its time to crash/shut
  85         // down once these start returning failure.
  86         // A PermanentFailure implies we should probably just shut down the node since we're
  87         // force-closing channels without even broadcasting!
  88
  89         fn persist_new_channel(&self, funding_txo: OutPoint, monitor: &ChannelMonitor<ChannelSigner>, _update_id: MonitorUpdateId) -> chain::ChannelMonitorUpdateStatus {
  90                 let key = format!("monitors/{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
  91                 match self.persist(&key, monitor) {
  92                         Ok(()) => chain::ChannelMonitorUpdateStatus::Completed,
  93                         Err(_) => chain::ChannelMonitorUpdateStatus::PermanentFailure,
  94                 }
  95         }
  96
  97         fn update_persisted_channel(&self, funding_txo: OutPoint, _update: Option<&ChannelMonitorUpdate>, monitor: &ChannelMonitor<ChannelSigner>, _update_id: MonitorUpdateId) -> chain::ChannelMonitorUpdateStatus {
  98                 let key = format!("monitors/{}_{}", funding_txo.txid.to_hex(), funding_txo.index);
  99                 match self.persist(&key, monitor) {
 100                         Ok(()) => chain::ChannelMonitorUpdateStatus::Completed,
 101                         Err(_) => chain::ChannelMonitorUpdateStatus::PermanentFailure,
 102                 }
 103         }
 104 }