_ Git - ldk-java/blob - src/main/java/org/ldk/batteries/ChannelManagerConstructor.java

   1 package org.ldk.batteries;
   2
   3 import org.jetbrains.annotations.Nullable;
   4 import org.ldk.enums.LDKNetwork;
   5 import org.ldk.structs.*;
   6 import org.ldk.util.TwoTuple;
   7
   8
   9 /**
  10  * A simple utility class which assists in constructing a fresh or deserializing from disk a ChannelManager and one or
  11  * more ChannelMonitors.
  12  */
  13 public class ChannelManagerConstructor {
  14     /**
  15      * An Exception that indicates the serialized data is invalid and has been corrupted on disk. You should attempt to
  16      * restore from a backup if there is one which is known to be current. Otherwise, funds may have been lost.
  17      */
  18     public static class InvalidSerializedDataException extends Exception {}
  19
  20     /**
  21      * The ChannelManager either deserialized or newly-constructed.
  22      */
  23     public final ChannelManager channel_manager;
  24     /**
  25      * The latest block has the channel manager saw. If this is non-null it is a 32-byte block hash.
  26      * You should sync the blockchain starting with the block that builds on this block.
  27      */
  28     public final byte[] channel_manager_latest_block_hash;
  29     /**
  30      * A list of ChannelMonitors and the last block they each saw. You should sync the blockchain on each individually
  31      * starting with the block that builds on the hash given.
  32      * After doing so (and syncing the blockchain on the channel manager as well), you should call chain_sync_completed()
  33      * and then continue to normal application operation.
  34      */
  35     public final TwoTuple<ChannelMonitor, byte[]>[] channel_monitors;
  36
  37     private final Watch chain_watch;
  38
  39     /**
  40      * Deserializes a channel manager and a set of channel monitors from the given serialized copies and interface implementations
  41      *
  42      * @param filter If provided, the outputs which were previously registered to be monitored for will be loaded into the filter.
  43      *               Note that if the provided Watch is a ChainWatch and has an associated filter, the previously registered
  44      *               outputs will be loaded when chain_sync_completed is called.
  45      */
  46     public ChannelManagerConstructor(byte[] channel_manager_serialized, byte[][] channel_monitors_serialized,
  47                                      KeysInterface keys_interface, FeeEstimator fee_estimator, Watch chain_watch, @Nullable Filter filter,
  48                                      BroadcasterInterface tx_broadcaster, Logger logger) throws InvalidSerializedDataException {
  49         final ChannelMonitor[] monitors = new ChannelMonitor[channel_monitors_serialized.length];
  50         this.channel_monitors = new TwoTuple[monitors.length];
  51         for (int i = 0; i < monitors.length; i++) {
  52             Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ res = UtilMethods.constructor_BlockHashChannelMonitorZ_read(channel_monitors_serialized[i], keys_interface);
  53             if (res instanceof Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ.Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ_Err) {
  54                 throw new InvalidSerializedDataException();
  55             }
  56             monitors[i] = ((Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ.Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ_OK) res).res.b;
  57             this.channel_monitors[i] = new TwoTuple<>(monitors[i], ((Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ.Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ_OK)res).res.a);
  58         }
  59         Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ res =
  60                 UtilMethods.constructor_BlockHashChannelManagerZ_read(channel_manager_serialized, keys_interface, fee_estimator, chain_watch, tx_broadcaster,
  61                         logger, UserConfig.constructor_default(), monitors);
  62         if (res instanceof Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_Err) {
  63             throw new InvalidSerializedDataException();
  64         }
  65         this.channel_manager = ((Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_OK)res).res.b;
  66         this.channel_manager_latest_block_hash = ((Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_OK)res).res.a;
  67         this.chain_watch = chain_watch;
  68         if (filter != null) {
  69             for (ChannelMonitor monitor : monitors) {
  70                 monitor.load_outputs_to_watch(filter);
  71             }
  72         }
  73     }
  74
  75     /**
  76      * Constructs a channel manager from the given interface implementations
  77      */
  78     public ChannelManagerConstructor(LDKNetwork network, UserConfig config, byte[] current_blockchain_tip_hash, int current_blockchain_tip_height,
  79                                      KeysInterface keys_interface, FeeEstimator fee_estimator, Watch chain_watch,
  80                                      BroadcasterInterface tx_broadcaster, Logger logger) throws InvalidSerializedDataException {
  81         channel_monitors = new TwoTuple[0];
  82         channel_manager_latest_block_hash = null;
  83         this.chain_watch = chain_watch;
  84         channel_manager = ChannelManager.constructor_new(fee_estimator, chain_watch, tx_broadcaster, logger, keys_interface, config, network, current_blockchain_tip_hash, current_blockchain_tip_height);
  85     }
  86
  87     /**
  88      * Utility which adds all of the deserialized ChannelMonitors to the chain watch so that further updates from the
  89      * ChannelManager are processed as normal.
  90      */
  91     public void chain_sync_completed() {
  92         for (TwoTuple<ChannelMonitor, byte[]> monitor: channel_monitors) {
  93             this.chain_watch.watch_channel(monitor.a.get_funding_txo().a, monitor.a);
  94         }
  95     }
  96 }