Merge pull request #50 from TheBlueMatt/main
[ldk-java] / 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  * [`PermanentFailure`]: ChannelMonitorUpdateErr::PermanentFailure
29  */
30 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
31 public class Watch extends CommonBase {
32         final bindings.LDKWatch bindings_instance;
33         Watch(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }
34         private Watch(bindings.LDKWatch arg) {
35                 super(bindings.LDKWatch_new(arg));
36                 this.ptrs_to.add(arg);
37                 this.bindings_instance = arg;
38         }
39         @Override @SuppressWarnings("deprecation")
40         protected void finalize() throws Throwable {
41                 if (ptr != 0) { bindings.Watch_free(ptr); } super.finalize();
42         }
43
44         public static interface WatchInterface {
45                 /**
46                  * Watches a channel identified by `funding_txo` using `monitor`.
47                  * 
48                  * Implementations are responsible for watching the chain for the funding transaction along
49                  * with any spends of outputs returned by [`get_outputs_to_watch`]. In practice, this means
50                  * calling [`block_connected`] and [`block_disconnected`] on the monitor.
51                  * 
52                  * Note: this interface MUST error with `ChannelMonitorUpdateErr::PermanentFailure` if
53                  * the given `funding_txo` has previously been registered via `watch_channel`.
54                  * 
55                  * [`get_outputs_to_watch`]: channelmonitor::ChannelMonitor::get_outputs_to_watch
56                  * [`block_connected`]: channelmonitor::ChannelMonitor::block_connected
57                  * [`block_disconnected`]: channelmonitor::ChannelMonitor::block_disconnected
58                  */
59                 Result_NoneChannelMonitorUpdateErrZ watch_channel(OutPoint funding_txo, ChannelMonitor monitor);
60                 /**
61                  * Updates a channel identified by `funding_txo` by applying `update` to its monitor.
62                  * 
63                  * Implementations must call [`update_monitor`] with the given update. See
64                  * [`ChannelMonitorUpdateErr`] for invariants around returning an error.
65                  * 
66                  * [`update_monitor`]: channelmonitor::ChannelMonitor::update_monitor
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          * Note: this interface MUST error with `ChannelMonitorUpdateErr::PermanentFailure` if
113          * the given `funding_txo` has previously been registered via `watch_channel`.
114          * 
115          * [`get_outputs_to_watch`]: channelmonitor::ChannelMonitor::get_outputs_to_watch
116          * [`block_connected`]: channelmonitor::ChannelMonitor::block_connected
117          * [`block_disconnected`]: channelmonitor::ChannelMonitor::block_disconnected
118          */
119         public Result_NoneChannelMonitorUpdateErrZ watch_channel(OutPoint funding_txo, ChannelMonitor monitor) {
120                 long ret = bindings.Watch_watch_channel(this.ptr, funding_txo == null ? 0 : funding_txo.ptr & ~1, monitor == null ? 0 : monitor.ptr & ~1);
121                 if (ret >= 0 && ret < 1024) { return null; }
122                 Result_NoneChannelMonitorUpdateErrZ ret_hu_conv = Result_NoneChannelMonitorUpdateErrZ.constr_from_ptr(ret);
123                 return ret_hu_conv;
124         }
125
126         /**
127          * Updates a channel identified by `funding_txo` by applying `update` to its monitor.
128          * 
129          * Implementations must call [`update_monitor`] with the given update. See
130          * [`ChannelMonitorUpdateErr`] for invariants around returning an error.
131          * 
132          * [`update_monitor`]: channelmonitor::ChannelMonitor::update_monitor
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 >= 0 && ret < 1024) { return null; }
137                 Result_NoneChannelMonitorUpdateErrZ ret_hu_conv = Result_NoneChannelMonitorUpdateErrZ.constr_from_ptr(ret);
138                 return ret_hu_conv;
139         }
140
141         /**
142          * Returns any monitor events since the last call. Subsequent calls must only return new
143          * events.
144          */
145         public MonitorEvent[] release_pending_monitor_events() {
146                 long[] ret = bindings.Watch_release_pending_monitor_events(this.ptr);
147                 MonitorEvent[] ret_conv_14_arr = new MonitorEvent[ret.length];
148                 for (int o = 0; o < ret.length; o++) {
149                         long ret_conv_14 = ret[o];
150                         MonitorEvent ret_conv_14_hu_conv = MonitorEvent.constr_from_ptr(ret_conv_14);
151                         ret_conv_14_hu_conv.ptrs_to.add(this);
152                         ret_conv_14_arr[o] = ret_conv_14_hu_conv;
153                 }
154                 return ret_conv_14_arr;
155         }
156
157 }