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

   1 package org.ldk.batteries;
   2
   3 import javax.annotation.Nullable;
   4 import org.ldk.enums.Network;
   5 import org.ldk.structs.*;
   6 import org.ldk.util.TwoTuple;
   7
   8 import java.io.IOException;
   9 import java.util.HashSet;
  10
  11
  12 /**
  13  * A simple utility class which assists in constructing a fresh or deserializing from disk a ChannelManager and one or
  14  * more ChannelMonitors.
  15  *
  16  * Also constructs a PeerManager and spawns a background thread to monitor for and notify you of relevant Events.
  17  */
  18 public class ChannelManagerConstructor {
  19     /**
  20      * An Exception that indicates the serialized data is invalid and has been corrupted on disk. You should attempt to
  21      * restore from a backup if there is one which is known to be current. Otherwise, funds may have been lost.
  22      */
  23     public static class InvalidSerializedDataException extends Exception {
  24         InvalidSerializedDataException(String reason) {
  25             super(reason);
  26         }
  27     }
  28
  29     /**
  30      * The ChannelManager either deserialized or newly-constructed.
  31      */
  32     public final ChannelManager channel_manager;
  33     /**
  34      * The latest block has the channel manager saw. If this is non-null it is a 32-byte block hash.
  35      * You should sync the blockchain starting with the block that builds on this block.
  36      */
  37     public final byte[] channel_manager_latest_block_hash;
  38     /**
  39      * A list of ChannelMonitors and the last block they each saw. You should sync the blockchain on each individually
  40      * starting with the block that builds on the hash given.
  41      * After doing so (and syncing the blockchain on the channel manager as well), you should call chain_sync_completed()
  42      * and then continue to normal application operation.
  43      */
  44     public final TwoTuple_BlockHashChannelMonitorZ[] channel_monitors;
  45     /**
  46      * A PeerManager which is constructed to pass messages and handle connections to peers.
  47      */
  48     public final PeerManager peer_manager;
  49     /**
  50      * A NioPeerHandler which manages a background thread to handle socket events and pass them to the peer_manager.
  51      */
  52     public final NioPeerHandler nio_peer_handler;
  53     /**
  54      * If a `NetworkGraph` is provided to the constructor *and* a `LockableScore` is provided to
  55          * `chain_sync_completed`, this will be non-null after `chain_sync_completed` returns.
  56          *
  57      * It should be used to send payments instead of doing so directly via the `channel_manager`.
  58          *
  59      * When payments are made through this, they are automatically retried and the provided Scorer
  60      * will be updated with payment failure data.
  61      */
  62     @Nullable public InvoicePayer payer;
  63
  64     private final ChainMonitor chain_monitor;
  65     @Nullable private final NetworkGraph net_graph;
  66     @Nullable private final NetGraphMsgHandler graph_msg_handler;
  67     private final Logger logger;
  68
  69     /**
  70      * Deserializes a channel manager and a set of channel monitors from the given serialized copies and interface implementations
  71      *
  72      * @param filter If provided, the outputs which were previously registered to be monitored for will be loaded into the filter.
  73      *               Note that if the provided Watch is a ChainWatch and has an associated filter, the previously registered
  74      *               outputs will be loaded when chain_sync_completed is called.
  75      */
  76     public ChannelManagerConstructor(byte[] channel_manager_serialized, byte[][] channel_monitors_serialized, UserConfig config,
  77                                      KeysInterface keys_interface, FeeEstimator fee_estimator, ChainMonitor chain_monitor,
  78                                      @Nullable Filter filter, @Nullable NetworkGraph net_graph,
  79                                      BroadcasterInterface tx_broadcaster, Logger logger) throws InvalidSerializedDataException {
  80         final IgnoringMessageHandler no_custom_messages = IgnoringMessageHandler.of();
  81         final ChannelMonitor[] monitors = new ChannelMonitor[channel_monitors_serialized.length];
  82         this.channel_monitors = new TwoTuple_BlockHashChannelMonitorZ[monitors.length];
  83         HashSet<OutPoint> monitor_funding_set = new HashSet();
  84         for (int i = 0; i < monitors.length; i++) {
  85             Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ res = UtilMethods.C2Tuple_BlockHashChannelMonitorZ_read(channel_monitors_serialized[i], keys_interface);
  86             if (res instanceof Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ.Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ_Err) {
  87                 throw new InvalidSerializedDataException("Serialized ChannelMonitor was corrupt");
  88             }
  89             byte[] block_hash = ((Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ.Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ_OK)res).res.get_a();
  90             monitors[i] = ((Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ.Result_C2Tuple_BlockHashChannelMonitorZDecodeErrorZ_OK) res).res.get_b();
  91             this.channel_monitors[i] = TwoTuple_BlockHashChannelMonitorZ.of(block_hash, monitors[i]);
  92             if (!monitor_funding_set.add(monitors[i].get_funding_txo().get_a()))
  93                 throw new InvalidSerializedDataException("Set of ChannelMonitors contained duplicates (ie the same funding_txo was set on multiple monitors)");
  94         }
  95         Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ res =
  96                 UtilMethods.C2Tuple_BlockHashChannelManagerZ_read(channel_manager_serialized, keys_interface, fee_estimator, chain_monitor.as_Watch(), tx_broadcaster,
  97                         logger, config, monitors);
  98         if (res instanceof Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_Err) {
  99             throw new InvalidSerializedDataException("Serialized ChannelManager was corrupt");
 100         }
 101         this.channel_manager = ((Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_OK)res).res.get_b();
 102         this.channel_manager_latest_block_hash = ((Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_OK)res).res.get_a();
 103         this.chain_monitor = chain_monitor;
 104         this.logger = logger;
 105         byte[] random_data = keys_interface.get_secure_random_bytes();
 106         this.net_graph = net_graph;
 107         if (net_graph != null) {
 108             //TODO: We really need to expose the Access here to let users prevent DoS issues
 109             this.graph_msg_handler = NetGraphMsgHandler.of(net_graph, Option_AccessZ.none(), logger);
 110             this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(),
 111                     graph_msg_handler.as_RoutingMessageHandler(),
 112                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
 113         } else {
 114             this.graph_msg_handler = null;
 115             this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), no_custom_messages.as_RoutingMessageHandler(),
 116                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
 117         }
 118         NioPeerHandler nio_peer_handler = null;
 119         try {
 120             nio_peer_handler = new NioPeerHandler(this.peer_manager);
 121         } catch (IOException e) {
 122             throw new IllegalStateException("We should never fail to construct nio objects unless we're on a platform that cannot run LDK.");
 123         }
 124         this.nio_peer_handler = nio_peer_handler;
 125         if (filter != null) {
 126             for (ChannelMonitor monitor : monitors) {
 127                 monitor.load_outputs_to_watch(filter);
 128             }
 129         }
 130     }
 131
 132     /**
 133      * Constructs a channel manager from the given interface implementations
 134      */
 135     public ChannelManagerConstructor(Network network, UserConfig config, byte[] current_blockchain_tip_hash, int current_blockchain_tip_height,
 136                                      KeysInterface keys_interface, FeeEstimator fee_estimator, ChainMonitor chain_monitor,
 137                                      @Nullable NetworkGraph net_graph,
 138                                      BroadcasterInterface tx_broadcaster, Logger logger) {
 139         final IgnoringMessageHandler no_custom_messages = IgnoringMessageHandler.of();
 140         channel_monitors = new TwoTuple_BlockHashChannelMonitorZ[0];
 141         channel_manager_latest_block_hash = null;
 142         this.chain_monitor = chain_monitor;
 143         BestBlock block = BestBlock.of(current_blockchain_tip_hash, current_blockchain_tip_height);
 144         ChainParameters params = ChainParameters.of(network, block);
 145         channel_manager = ChannelManager.of(fee_estimator, chain_monitor.as_Watch(), tx_broadcaster, logger, keys_interface, config, params);
 146         this.logger = logger;
 147         byte[] random_data = keys_interface.get_secure_random_bytes();
 148         this.net_graph = net_graph;
 149         if (net_graph != null) {
 150             //TODO: We really need to expose the Access here to let users prevent DoS issues
 151             this.graph_msg_handler = NetGraphMsgHandler.of(net_graph, Option_AccessZ.none(), logger);
 152             this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(),
 153                     graph_msg_handler.as_RoutingMessageHandler(),
 154                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
 155         } else {
 156             this.graph_msg_handler = null;
 157             this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), no_custom_messages.as_RoutingMessageHandler(),
 158                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
 159         }
 160         NioPeerHandler nio_peer_handler = null;
 161         try {
 162             nio_peer_handler = new NioPeerHandler(this.peer_manager);
 163         } catch (IOException e) {
 164             throw new IllegalStateException("We should never fail to construct nio objects unless we're on a platform that cannot run LDK.");
 165         }
 166         this.nio_peer_handler = nio_peer_handler;
 167     }
 168
 169     /**
 170      * Abstract interface which should handle Events and persist the ChannelManager. When you call chain_sync_completed
 171      * a background thread is started which will automatically call these methods for you when events occur.
 172      */
 173     public interface EventHandler {
 174         void handle_event(Event events);
 175         void persist_manager(byte[] channel_manager_bytes);
 176     }
 177
 178     BackgroundProcessor background_processor = null;
 179
 180     /**
 181      * Utility which adds all of the deserialized ChannelMonitors to the chain watch so that further updates from the
 182      * ChannelManager are processed as normal.
 183      *
 184      * This also spawns a background thread which will call the appropriate methods on the provided
 185      * EventHandler as required.
 186      */
 187     public void chain_sync_completed(EventHandler event_handler, @Nullable MultiThreadedLockableScore scorer) {
 188         if (background_processor != null) { return; }
 189         for (TwoTuple_BlockHashChannelMonitorZ monitor: channel_monitors) {
 190             this.chain_monitor.as_Watch().watch_channel(monitor.get_b().get_funding_txo().get_a(), monitor.get_b());
 191         }
 192         org.ldk.structs.EventHandler ldk_handler = org.ldk.structs.EventHandler.new_impl(event_handler::handle_event);
 193         if (this.net_graph != null && scorer != null) {
 194             Router router = DefaultRouter.of(net_graph, logger).as_Router();
 195             this.payer = InvoicePayer.of(this.channel_manager.as_Payer(), router, scorer, this.logger, ldk_handler, RetryAttempts.of(3));
 196 assert this.payer != null;
 197             ldk_handler = this.payer.as_EventHandler();
 198         }
 199
 200         background_processor = BackgroundProcessor.start(org.ldk.structs.ChannelManagerPersister.new_impl(channel_manager -> {
 201             event_handler.persist_manager(channel_manager.write());
 202             return Result_NoneErrorZ.ok();
 203         }), ldk_handler, this.chain_monitor, this.channel_manager, this.graph_msg_handler, this.peer_manager, this.logger);
 204     }
 205
 206     /**
 207      * Interrupt the background thread, stopping the background handling of events.
 208      */
 209     public void interrupt() {
 210         this.nio_peer_handler.interrupt();
 211         this.background_processor.stop();
 212     }
 213 }