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

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