_ Git - ldk-java/blob - src/main/java/org/ldk/structs/Filter.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 java.lang.ref.Reference;
   8 import javax.annotation.Nullable;
   9
  10 /**
  11  * The `Filter` trait defines behavior for indicating chain activity of interest pertaining to
  12  * channels.
  13  *
  14  * This is useful in order to have a [`Watch`] implementation convey to a chain source which
  15  * transactions to be notified of. Notification may take the form of pre-filtering blocks or, in
  16  * the case of [BIP 157]/[BIP 158], only fetching a block if the compact filter matches. If
  17  * receiving full blocks from a chain source, any further filtering is unnecessary.
  18  *
  19  * After an output has been registered, subsequent block retrievals from the chain source must not
  20  * exclude any transactions matching the new criteria nor any in-block descendants of such
  21  * transactions.
  22  *
  23  * Note that use as part of a [`Watch`] implementation involves reentrancy. Therefore, the `Filter`
  24  * should not block on I/O. Implementations should instead queue the newly monitored data to be
  25  * processed later. Then, in order to block until the data has been processed, any [`Watch`]
  26  * invocation that has called the `Filter` must return [`InProgress`].
  27  *
  28  * [`InProgress`]: ChannelMonitorUpdateStatus::InProgress
  29  * [BIP 157]: https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki
  30  * [BIP 158]: https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki
  31  */
  32 @SuppressWarnings("unchecked") // We correctly assign various generic arrays
  33 public class Filter extends CommonBase {
  34         final bindings.LDKFilter bindings_instance;
  35         Filter(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }
  36         private Filter(bindings.LDKFilter arg) {
  37                 super(bindings.LDKFilter_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.Filter_free(ptr); } super.finalize();
  44         }
  45
  46         public static interface FilterInterface {
  47                 /**
  48                  * Registers interest in a transaction with `txid` and having an output with `script_pubkey` as
  49                  * a spending condition.
  50                  */
  51                 void register_tx(byte[] txid, byte[] script_pubkey);
  52                 /**
  53                  * Registers interest in spends of a transaction output.
  54                  *
  55                  * Note that this method might be called during processing of a new block. You therefore need
  56                  * to ensure that also dependent output spents within an already connected block are correctly
  57                  * handled, e.g., by re-scanning the block in question whenever new outputs have been
  58                  * registered mid-processing.
  59                  */
  60                 void register_output(WatchedOutput output);
  61         }
  62         private static class LDKFilterHolder { Filter held; }
  63         public static Filter new_impl(FilterInterface arg) {
  64                 final LDKFilterHolder impl_holder = new LDKFilterHolder();
  65                 impl_holder.held = new Filter(new bindings.LDKFilter() {
  66                         @Override public void register_tx(byte[] txid, byte[] script_pubkey) {
  67                                 arg.register_tx(txid, script_pubkey);
  68                                 Reference.reachabilityFence(arg);
  69                         }
  70                         @Override public void register_output(long output) {
  71                                 org.ldk.structs.WatchedOutput output_hu_conv = null; if (output < 0 || output > 4096) { output_hu_conv = new org.ldk.structs.WatchedOutput(null, output); }
  72                                 if (output_hu_conv != null) { output_hu_conv.ptrs_to.add(this); };
  73                                 arg.register_output(output_hu_conv);
  74                                 Reference.reachabilityFence(arg);
  75                         }
  76                 });
  77                 return impl_holder.held;
  78         }
  79         /**
  80          * Registers interest in a transaction with `txid` and having an output with `script_pubkey` as
  81          * a spending condition.
  82          */
  83         public void register_tx(byte[] txid, byte[] script_pubkey) {
  84                 bindings.Filter_register_tx(this.ptr, InternalUtils.check_arr_len(txid, 32), script_pubkey);
  85                 Reference.reachabilityFence(this);
  86                 Reference.reachabilityFence(txid);
  87                 Reference.reachabilityFence(script_pubkey);
  88         }
  89
  90         /**
  91          * Registers interest in spends of a transaction output.
  92          *
  93          * Note that this method might be called during processing of a new block. You therefore need
  94          * to ensure that also dependent output spents within an already connected block are correctly
  95          * handled, e.g., by re-scanning the block in question whenever new outputs have been
  96          * registered mid-processing.
  97          */
  98         public void register_output(org.ldk.structs.WatchedOutput output) {
  99                 bindings.Filter_register_output(this.ptr, output == null ? 0 : output.ptr);
 100                 Reference.reachabilityFence(this);
 101                 Reference.reachabilityFence(output);
 102                 if (this != null) { this.ptrs_to.add(output); };
 103         }
 104
 105 }