_ Git - ldk-java/blob - c_sharp/src/org/ldk/structs/BackgroundProcessor.cs

   1 using org.ldk.impl;
   2 using org.ldk.enums;
   3 using org.ldk.util;
   4 using System;
   5
   6 namespace org { namespace ldk { namespace structs {
   7
   8
   9 /**
  10  * `BackgroundProcessor` takes care of tasks that (1) need to happen periodically to keep
  11  * Rust-Lightning running properly, and (2) either can or should be run in the background. Its
  12  * responsibilities are:
  13  * Processing [`Event`]s with a user-provided [`EventHandler`].
  14  * Monitoring whether the [`ChannelManager`] needs to be re-persisted to disk, and if so,
  15  * writing it to disk/backups by invoking the callback given to it at startup.
  16  * [`ChannelManager`] persistence should be done in the background.
  17  * Calling [`ChannelManager::timer_tick_occurred`] and [`PeerManager::timer_tick_occurred`]
  18  * at the appropriate intervals.
  19  * Calling [`NetworkGraph::remove_stale_channels_and_tracking`] (if a [`GossipSync`] with a
  20  * [`NetworkGraph`] is provided to [`BackgroundProcessor::start`]).
  21  *
  22  * It will also call [`PeerManager::process_events`] periodically though this shouldn't be relied
  23  * upon as doing so may result in high latency.
  24  *
  25  * # Note
  26  *
  27  * If [`ChannelManager`] persistence fails and the persisted manager becomes out-of-date, then
  28  * there is a risk of channels force-closing on startup when the manager realizes it's outdated.
  29  * However, as long as [`ChannelMonitor`] backups are sound, no funds besides those used for
  30  * unilateral chain closure fees are at risk.
  31  *
  32  * [`ChannelMonitor`]: lightning::chain::channelmonitor::ChannelMonitor
  33  * [`Event`]: lightning::util::events::Event
  34  * BackgroundProcessor will immediately stop on drop. It should be stored until shutdown.
  35  */
  36 public class BackgroundProcessor : CommonBase {
  37         internal BackgroundProcessor(object _dummy, long ptr) : base(ptr) { }
  38         ~BackgroundProcessor() {
  39                 if (ptr != 0) { bindings.BackgroundProcessor_free(ptr); }
  40         }
  41
  42         /**
  43          * Start a background thread that takes care of responsibilities enumerated in the [top-level
  44          * documentation].
  45          *
  46          * The thread runs indefinitely unless the object is dropped, [`stop`] is called, or
  47          * [`Persister::persist_manager`] returns an error. In case of an error, the error is retrieved by calling
  48          * either [`join`] or [`stop`].
  49          *
  50          * # Data Persistence
  51          *
  52          * [`Persister::persist_manager`] is responsible for writing out the [`ChannelManager`] to disk, and/or
  53          * uploading to one or more backup services. See [`ChannelManager::write`] for writing out a
  54          * [`ChannelManager`]. See the `lightning-persister` crate for LDK's
  55          * provided implementation.
  56          *
  57          * [`Persister::persist_graph`] is responsible for writing out the [`NetworkGraph`] to disk, if
  58          * [`GossipSync`] is supplied. See [`NetworkGraph::write`] for writing out a [`NetworkGraph`].
  59          * See the `lightning-persister` crate for LDK's provided implementation.
  60          *
  61          * Typically, users should either implement [`Persister::persist_manager`] to never return an
  62          * error or call [`join`] and handle any error that may arise. For the latter case,
  63          * `BackgroundProcessor` must be restarted by calling `start` again after handling the error.
  64          *
  65          * # Event Handling
  66          *
  67          * `event_handler` is responsible for handling events that users should be notified of (e.g.,
  68          * payment failed). [`BackgroundProcessor`] may decorate the given [`EventHandler`] with common
  69          * functionality implemented by other handlers.
  70          * [`P2PGossipSync`] if given will update the [`NetworkGraph`] based on payment failures.
  71          *
  72          * # Rapid Gossip Sync
  73          *
  74          * If rapid gossip sync is meant to run at startup, pass [`RapidGossipSync`] via `gossip_sync`
  75          * to indicate that the [`BackgroundProcessor`] should not prune the [`NetworkGraph`] instance
  76          * until the [`RapidGossipSync`] instance completes its first sync.
  77          *
  78          * [top-level documentation]: BackgroundProcessor
  79          * [`join`]: Self::join
  80          * [`stop`]: Self::stop
  81          * [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
  82          * [`ChannelManager::write`]: lightning::ln::channelmanager::ChannelManager#impl-Writeable
  83          * [`Persister::persist_manager`]: lightning::util::persist::Persister::persist_manager
  84          * [`Persister::persist_graph`]: lightning::util::persist::Persister::persist_graph
  85          * [`NetworkGraph`]: lightning::routing::gossip::NetworkGraph
  86          * [`NetworkGraph::write`]: lightning::routing::gossip::NetworkGraph#impl-Writeable
  87          */
  88         public static BackgroundProcessor start(org.ldk.structs.Persister persister, org.ldk.structs.EventHandler event_handler, org.ldk.structs.ChainMonitor chain_monitor, org.ldk.structs.ChannelManager channel_manager, org.ldk.structs.GossipSync gossip_sync, org.ldk.structs.PeerManager peer_manager, org.ldk.structs.Logger logger, org.ldk.structs.Option_WriteableScoreZ scorer) {
  89                 long ret = bindings.BackgroundProcessor_start(persister == null ? 0 : persister.ptr, event_handler == null ? 0 : event_handler.ptr, chain_monitor == null ? 0 : chain_monitor.ptr, channel_manager == null ? 0 : channel_manager.ptr, gossip_sync.ptr, peer_manager == null ? 0 : peer_manager.ptr, logger == null ? 0 : logger.ptr, scorer.ptr);
  90                 GC.KeepAlive(persister);
  91                 GC.KeepAlive(event_handler);
  92                 GC.KeepAlive(chain_monitor);
  93                 GC.KeepAlive(channel_manager);
  94                 GC.KeepAlive(gossip_sync);
  95                 GC.KeepAlive(peer_manager);
  96                 GC.KeepAlive(logger);
  97                 GC.KeepAlive(scorer);
  98                 if (ret >= 0 && ret <= 4096) { return null; }
  99                 org.ldk.structs.BackgroundProcessor ret_hu_conv = null; if (ret < 0 || ret > 4096) { ret_hu_conv = new org.ldk.structs.BackgroundProcessor(null, ret); }
 100                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(ret_hu_conv); };
 101                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(persister); };
 102                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(event_handler); };
 103                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(chain_monitor); };
 104                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(channel_manager); };
 105                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(peer_manager); };
 106                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(logger); };
 107                 if (ret_hu_conv != null) { ret_hu_conv.ptrs_to.AddLast(scorer); };
 108                 return ret_hu_conv;
 109         }
 110
 111         /**
 112          * Join `BackgroundProcessor`'s thread, returning any error that occurred while persisting
 113          * [`ChannelManager`].
 114          *
 115          * # Panics
 116          *
 117          * This function panics if the background thread has panicked such as while persisting or
 118          * handling events.
 119          *
 120          * [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
 121          */
 122         public Result_NoneErrorZ join() {
 123                 long ret = bindings.BackgroundProcessor_join(this.ptr);
 124                 GC.KeepAlive(this);
 125                 if (ret >= 0 && ret <= 4096) { return null; }
 126                 Result_NoneErrorZ ret_hu_conv = Result_NoneErrorZ.constr_from_ptr(ret);
 127                 if (this != null) { this.ptrs_to.AddLast(this); };
 128                 // Due to rust's strict-ownership memory model, in some cases we need to "move"
 129                 // an object to pass exclusive ownership to the function being called.
 130                 // In most cases, we avoid this being visible in GC'd languages by cloning the object
 131                 // at the FFI layer, creating a new object which Rust can claim ownership of
 132                 // However, in some cases (eg here), there is no way to clone an object, and thus
 133                 // we actually have to pass full ownership to Rust.
 134                 // Thus, after this call, this is reset to null and is now a dummy object.
 135                 this.ptr = 0;;
 136                 return ret_hu_conv;
 137         }
 138
 139         /**
 140          * Stop `BackgroundProcessor`'s thread, returning any error that occurred while persisting
 141          * [`ChannelManager`].
 142          *
 143          * # Panics
 144          *
 145          * This function panics if the background thread has panicked such as while persisting or
 146          * handling events.
 147          *
 148          * [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
 149          */
 150         public Result_NoneErrorZ stop() {
 151                 long ret = bindings.BackgroundProcessor_stop(this.ptr);
 152                 GC.KeepAlive(this);
 153                 if (ret >= 0 && ret <= 4096) { return null; }
 154                 Result_NoneErrorZ ret_hu_conv = Result_NoneErrorZ.constr_from_ptr(ret);
 155                 if (this != null) { this.ptrs_to.AddLast(this); };
 156                 // Due to rust's strict-ownership memory model, in some cases we need to "move"
 157                 // an object to pass exclusive ownership to the function being called.
 158                 // In most cases, we avoid this being visible in GC'd languages by cloning the object
 159                 // at the FFI layer, creating a new object which Rust can claim ownership of
 160                 // However, in some cases (eg here), there is no way to clone an object, and thus
 161                 // we actually have to pass full ownership to Rust.
 162                 // Thus, after this call, this is reset to null and is now a dummy object.
 163                 this.ptr = 0;;
 164                 return ret_hu_conv;
 165         }
 166
 167 }
 168 } } }