1 package org.ldk.batteries;
3 import javax.annotation.Nullable;
4 import org.ldk.enums.Network;
5 import org.ldk.structs.*;
6 import org.ldk.util.TwoTuple;
8 import java.io.IOException;
9 import java.util.HashSet;
13 * A simple utility class which assists in constructing a fresh or deserializing from disk a ChannelManager and one or
14 * more ChannelMonitors.
16 * Also constructs a PeerManager and spawns a background thread to monitor for and notify you of relevant Events.
18 public class ChannelManagerConstructor {
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.
23 public static class InvalidSerializedDataException extends Exception {
24 InvalidSerializedDataException(String reason) {
30 * The ChannelManager either deserialized or newly-constructed.
32 public final ChannelManager channel_manager;
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.
37 public final byte[] channel_manager_latest_block_hash;
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.
44 public final TwoTuple_BlockHashChannelMonitorZ[] channel_monitors;
46 * A PeerManager which is constructed to pass messages and handle connections to peers.
48 public final PeerManager peer_manager;
50 * A NioPeerHandler which manages a background thread to handle socket events and pass them to the peer_manager.
52 public final NioPeerHandler nio_peer_handler;
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.
57 * It should be used to send payments instead of doing so directly via the `channel_manager`.
59 * When payments are made through this, they are automatically retried and the provided Scorer
60 * will be updated with payment failure data.
62 @Nullable public InvoicePayer payer;
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;
70 * Deserializes a channel manager and a set of channel monitors from the given serialized copies and interface implementations
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.
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");
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)");
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");
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());
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());
118 NioPeerHandler nio_peer_handler = null;
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.");
124 this.nio_peer_handler = nio_peer_handler;
125 if (filter != null) {
126 for (ChannelMonitor monitor : monitors) {
127 monitor.load_outputs_to_watch(filter);
133 * Constructs a channel manager from the given interface implementations
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());
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());
160 NioPeerHandler nio_peer_handler = null;
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.");
166 this.nio_peer_handler = nio_peer_handler;
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.
173 public interface EventHandler {
174 void handle_event(Event events);
175 void persist_manager(byte[] channel_manager_bytes);
178 BackgroundProcessor background_processor = null;
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.
184 * This also spawns a background thread which will call the appropriate methods on the provided
185 * EventHandler as required.
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());
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();
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);
207 * Interrupt the background thread, stopping the background handling of events.
209 public void interrupt() {
210 this.background_processor.stop();
211 this.nio_peer_handler.interrupt();