_ Git - ldk-java/blob - src/main/java/org/ldk/structs/Watch.java

   1 package org.ldk.structs;
   2
   3 import org.ldk.impl.bindings;
   4 import org.ldk.enums.*;
   5 import org.ldk.util.*;
   6 import java.util.Arrays;
   7 import javax.annotation.Nullable;
   8
   9 /**
  10  * The `Watch` trait defines behavior for watching on-chain activity pertaining to channels as
  11  * blocks are connected and disconnected.
  12  *
  13  * Each channel is associated with a [`ChannelMonitor`]. Implementations of this trait are
  14  * responsible for maintaining a set of monitors such that they can be updated accordingly as
  15  * channel state changes and HTLCs are resolved. See method documentation for specific
  16  * requirements.
  17  *
  18  * Implementations **must** ensure that updates are successfully applied and persisted upon method
  19  * completion. If an update fails with a [`PermanentFailure`], then it must immediately shut down
  20  * without taking any further action such as persisting the current state.
  21  *
  22  * If an implementation maintains multiple instances of a channel's monitor (e.g., by storing
  23  * backup copies), then it must ensure that updates are applied across all instances. Otherwise, it
  24  * could result in a revoked transaction being broadcast, allowing the counterparty to claim all
  25  * funds in the channel. See [`ChannelMonitorUpdateErr`] for more details about how to handle
  26  * multiple instances.
  27  *
  28  * [`ChannelMonitor`]: channelmonitor::ChannelMonitor
  29  * [`ChannelMonitorUpdateErr`]: channelmonitor::ChannelMonitorUpdateErr
  30  * [`PermanentFailure`]: channelmonitor::ChannelMonitorUpdateErr::PermanentFailure
  31  */
  32 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
  33 public class Watch extends CommonBase {
  34         final bindings.LDKWatch bindings_instance;
  35         Watch(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }
  36         private Watch(bindings.LDKWatch arg) {
  37                 super(bindings.LDKWatch_new(arg));
  38                 this.ptrs_to.add(arg);
  39                 this.bindings_instance = arg;
  40         }
  41         @Override @SuppressWarnings("deprecation")
  42         protected void finalize() throws Throwable {
  43                 if (ptr != 0) { bindings.Watch_free(ptr); } super.finalize();
  44         }
  45
  46         public static interface WatchInterface {
  47                 /**
  48                  * Watches a channel identified by `funding_txo` using `monitor`.
  49                  *
  50                  * Implementations are responsible for watching the chain for the funding transaction along
  51                  * with any spends of outputs returned by [`get_outputs_to_watch`]. In practice, this means
  52                  * calling [`block_connected`] and [`block_disconnected`] on the monitor.
  53                  *
  54                  * [`get_outputs_to_watch`]: channelmonitor::ChannelMonitor::get_outputs_to_watch
  55                  * [`block_connected`]: channelmonitor::ChannelMonitor::block_connected
  56                  * [`block_disconnected`]: channelmonitor::ChannelMonitor::block_disconnected
  57                  */
  58                 Result_NoneChannelMonitorUpdateErrZ watch_channel(OutPoint funding_txo, ChannelMonitor monitor);
  59                 /**
  60                  * Updates a channel identified by `funding_txo` by applying `update` to its monitor.
  61                  *
  62                  * Implementations must call [`update_monitor`] with the given update. See
  63                  * [`ChannelMonitorUpdateErr`] for invariants around returning an error.
  64                  *
  65                  * [`update_monitor`]: channelmonitor::ChannelMonitor::update_monitor
  66                  * [`ChannelMonitorUpdateErr`]: channelmonitor::ChannelMonitorUpdateErr
  67                  */
  68                 Result_NoneChannelMonitorUpdateErrZ update_channel(OutPoint funding_txo, ChannelMonitorUpdate update);
  69                 /**
  70                  * Returns any monitor events since the last call. Subsequent calls must only return new
  71                  * events.
  72                  */
  73                 MonitorEvent[] release_pending_monitor_events();
  74         }
  75         private static class LDKWatchHolder { Watch held; }
  76         public static Watch new_impl(WatchInterface arg) {
  77                 final LDKWatchHolder impl_holder = new LDKWatchHolder();
  78                 impl_holder.held = new Watch(new bindings.LDKWatch() {
  79                         @Override public long watch_channel(long funding_txo, long monitor) {
  80                                 OutPoint funding_txo_hu_conv = new OutPoint(null, funding_txo);
  81                                 funding_txo_hu_conv.ptrs_to.add(this);
  82                                 ChannelMonitor monitor_hu_conv = new ChannelMonitor(null, monitor);
  83                                 monitor_hu_conv.ptrs_to.add(this);
  84                                 Result_NoneChannelMonitorUpdateErrZ ret = arg.watch_channel(funding_txo_hu_conv, monitor_hu_conv);
  85                                 long result = ret != null ? ret.ptr : 0;
  86                                 return result;
  87                         }
  88                         @Override public long update_channel(long funding_txo, long update) {
  89                                 OutPoint funding_txo_hu_conv = new OutPoint(null, funding_txo);
  90                                 funding_txo_hu_conv.ptrs_to.add(this);
  91                                 ChannelMonitorUpdate update_hu_conv = new ChannelMonitorUpdate(null, update);
  92                                 update_hu_conv.ptrs_to.add(this);
  93                                 Result_NoneChannelMonitorUpdateErrZ ret = arg.update_channel(funding_txo_hu_conv, update_hu_conv);
  94                                 long result = ret != null ? ret.ptr : 0;
  95                                 return result;
  96                         }
  97                         @Override public long[] release_pending_monitor_events() {
  98                                 MonitorEvent[] ret = arg.release_pending_monitor_events();
  99                                 long[] result = ret != null ? Arrays.stream(ret).mapToLong(ret_conv_14 -> ret_conv_14.ptr).toArray() : null;
 100                                 return result;
 101                         }
 102                 });
 103                 return impl_holder.held;
 104         }
 105         /**
 106          * Watches a channel identified by `funding_txo` using `monitor`.
 107          *
 108          * Implementations are responsible for watching the chain for the funding transaction along
 109          * with any spends of outputs returned by [`get_outputs_to_watch`]. In practice, this means
 110          * calling [`block_connected`] and [`block_disconnected`] on the monitor.
 111          *
 112          * [`get_outputs_to_watch`]: channelmonitor::ChannelMonitor::get_outputs_to_watch
 113          * [`block_connected`]: channelmonitor::ChannelMonitor::block_connected
 114          * [`block_disconnected`]: channelmonitor::ChannelMonitor::block_disconnected
 115          */
 116         public Result_NoneChannelMonitorUpdateErrZ watch_channel(OutPoint funding_txo, ChannelMonitor monitor) {
 117                 long ret = bindings.Watch_watch_channel(this.ptr, funding_txo == null ? 0 : funding_txo.ptr & ~1, monitor == null ? 0 : monitor.ptr & ~1);
 118                 if (ret < 1024) { return null; }
 119                 Result_NoneChannelMonitorUpdateErrZ ret_hu_conv = Result_NoneChannelMonitorUpdateErrZ.constr_from_ptr(ret);
 120                 this.ptrs_to.add(funding_txo);
 121                 this.ptrs_to.add(monitor);
 122                 return ret_hu_conv;
 123         }
 124
 125         /**
 126          * Updates a channel identified by `funding_txo` by applying `update` to its monitor.
 127          *
 128          * Implementations must call [`update_monitor`] with the given update. See
 129          * [`ChannelMonitorUpdateErr`] for invariants around returning an error.
 130          *
 131          * [`update_monitor`]: channelmonitor::ChannelMonitor::update_monitor
 132          * [`ChannelMonitorUpdateErr`]: channelmonitor::ChannelMonitorUpdateErr
 133          */
 134         public Result_NoneChannelMonitorUpdateErrZ update_channel(OutPoint funding_txo, ChannelMonitorUpdate update) {
 135                 long ret = bindings.Watch_update_channel(this.ptr, funding_txo == null ? 0 : funding_txo.ptr & ~1, update == null ? 0 : update.ptr & ~1);
 136                 if (ret < 1024) { return null; }
 137                 Result_NoneChannelMonitorUpdateErrZ ret_hu_conv = Result_NoneChannelMonitorUpdateErrZ.constr_from_ptr(ret);
 138                 this.ptrs_to.add(funding_txo);
 139                 this.ptrs_to.add(update);
 140                 return ret_hu_conv;
 141         }
 142
 143         /**
 144          * Returns any monitor events since the last call. Subsequent calls must only return new
 145          * events.
 146          */
 147         public MonitorEvent[] release_pending_monitor_events() {
 148                 long[] ret = bindings.Watch_release_pending_monitor_events(this.ptr);
 149                 MonitorEvent[] ret_conv_14_arr = new MonitorEvent[ret.length];
 150                 for (int o = 0; o < ret.length; o++) {
 151                         long ret_conv_14 = ret[o];
 152                         MonitorEvent ret_conv_14_hu_conv = MonitorEvent.constr_from_ptr(ret_conv_14);
 153                         ret_conv_14_hu_conv.ptrs_to.add(this);
 154                         ret_conv_14_arr[o] = ret_conv_14_hu_conv;
 155                 }
 156                 return ret_conv_14_arr;
 157         }
 158
 159 }