Add support for InvoicePayer to ChannelManagerConstructor and test

Note that this adds an additional bit of runs in the
HumanObjectPeerTest, bringing leaks for a full run to:
    149 allocations remained for 1157302 bytes.

Author: Matt Corallo

src/main/java/org/ldk/batteries/ChannelManagerConstructor.java

@@ -45,13 +45,22 @@ public static class InvalidSerializedDataException extends Exception {}
      * A NioPeerHandler which manages a background thread to handle socket events and pass them to the peer_manager.
      */
     public final NioPeerHandler nio_peer_handler;
+    /**
+     * If a `NetworkGraph` is provided to the constructor *and* a `LockableScore` is provided to
+	 * `chain_sync_completed`, this will be non-null after `chain_sync_completed` returns.
+	 *
+     * It should be used to send payments instead of doing so directly via the `channel_manager`.
+	 *
+     * When payments are made through this, they are automatically retried and the provided Scorer
+     * will be updated with payment failure data.
+     */
+    @Nullable public InvoicePayer payer;
 
     private final ChainMonitor chain_monitor;
-
+    @Nullable private final NetworkGraph net_graph;
+    @Nullable private final NetGraphMsgHandler graph_msg_handler;
     private final Logger logger;
 
-    public final @Nullable NetGraphMsgHandler router;
-
     /**
      * Deserializes a channel manager and a set of channel monitors from the given serialized copies and interface implementations
      *
@@ -61,7 +70,7 @@ public static class InvalidSerializedDataException extends Exception {}
      */
     public ChannelManagerConstructor(byte[] channel_manager_serialized, byte[][] channel_monitors_serialized,
                                      KeysInterface keys_interface, FeeEstimator fee_estimator, ChainMonitor chain_monitor, @Nullable Filter filter,
-                                     @Nullable NetGraphMsgHandler router,
+                                     @Nullable NetworkGraph net_graph,
                                      BroadcasterInterface tx_broadcaster, Logger logger) throws InvalidSerializedDataException {
         final IgnoringMessageHandler no_custom_messages = IgnoringMessageHandler.of();
         final ChannelMonitor[] monitors = new ChannelMonitor[channel_monitors_serialized.length];
@@ -84,14 +93,18 @@ public ChannelManagerConstructor(byte[] channel_manager_serialized, byte[][] cha
         this.channel_manager = ((Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_OK)res).res.get_b();
         this.channel_manager_latest_block_hash = ((Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ.Result_C2Tuple_BlockHashChannelManagerZDecodeErrorZ_OK)res).res.get_a();
         this.chain_monitor = chain_monitor;
-        this.router = router;
         this.logger = logger;
         byte[] random_data = keys_interface.get_secure_random_bytes();
-        if (router != null) {
-            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), router.as_RoutingMessageHandler(),
+        this.net_graph = net_graph;
+        if (net_graph != null) {
+            //TODO: We really need to expose the Access here to let users prevent DoS issues
+            this.graph_msg_handler = NetGraphMsgHandler.of(net_graph, Option_AccessZ.none(), logger);
+            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(),
+                    graph_msg_handler.as_RoutingMessageHandler(),
                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
         } else {
-            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), (IgnoringMessageHandler.of()).as_RoutingMessageHandler(),
+            this.graph_msg_handler = null;
+            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), no_custom_messages.as_RoutingMessageHandler(),
                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
         }
         NioPeerHandler nio_peer_handler = null;
@@ -113,23 +126,27 @@ public ChannelManagerConstructor(byte[] channel_manager_serialized, byte[][] cha
      */
     public ChannelManagerConstructor(Network network, UserConfig config, byte[] current_blockchain_tip_hash, int current_blockchain_tip_height,
                                      KeysInterface keys_interface, FeeEstimator fee_estimator, ChainMonitor chain_monitor,
-                                     @Nullable NetGraphMsgHandler router,
+                                     @Nullable NetworkGraph net_graph,
                                      BroadcasterInterface tx_broadcaster, Logger logger) {
         final IgnoringMessageHandler no_custom_messages = IgnoringMessageHandler.of();
         channel_monitors = new TwoTuple_BlockHashChannelMonitorZ[0];
         channel_manager_latest_block_hash = null;
         this.chain_monitor = chain_monitor;
-        this.router = router;
         BestBlock block = BestBlock.of(current_blockchain_tip_hash, current_blockchain_tip_height);
         ChainParameters params = ChainParameters.of(network, block);
         channel_manager = ChannelManager.of(fee_estimator, chain_monitor.as_Watch(), tx_broadcaster, logger, keys_interface, config, params);
         this.logger = logger;
         byte[] random_data = keys_interface.get_secure_random_bytes();
-        if (router != null) {
-            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), router.as_RoutingMessageHandler(),
+        this.net_graph = net_graph;
+        if (net_graph != null) {
+            //TODO: We really need to expose the Access here to let users prevent DoS issues
+            this.graph_msg_handler = NetGraphMsgHandler.of(net_graph, Option_AccessZ.none(), logger);
+            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(),
+                    graph_msg_handler.as_RoutingMessageHandler(),
                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
         } else {
-            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), (IgnoringMessageHandler.of()).as_RoutingMessageHandler(),
+            this.graph_msg_handler = null;
+            this.peer_manager = PeerManager.of(channel_manager.as_ChannelMessageHandler(), no_custom_messages.as_RoutingMessageHandler(),
                     keys_interface.get_node_secret(), random_data, logger, no_custom_messages.as_CustomMessageHandler());
         }
         NioPeerHandler nio_peer_handler = null;
@@ -159,16 +176,23 @@ public interface EventHandler {
      * This also spawns a background thread which will call the appropriate methods on the provided
      * EventHandler as required.
      */
-    public void chain_sync_completed(EventHandler event_handler) {
+    public void chain_sync_completed(EventHandler event_handler, @Nullable LockableScore scorer) {
         if (background_processor != null) { return; }
         for (TwoTuple_BlockHashChannelMonitorZ monitor: channel_monitors) {
             this.chain_monitor.as_Watch().watch_channel(monitor.get_b().get_funding_txo().get_a(), monitor.get_b());
         }
+        org.ldk.structs.EventHandler ldk_handler = org.ldk.structs.EventHandler.new_impl(event_handler::handle_event);
+        if (this.net_graph != null && scorer != null) {
+            Router router = DefaultRouter.of(net_graph, logger).as_Router();
+            this.payer = InvoicePayer.of(this.channel_manager.as_Payer(), router, scorer, this.logger, ldk_handler, RetryAttempts.of(3));
+assert this.payer != null;
+            ldk_handler = this.payer.as_EventHandler();
+        }
+
         background_processor = BackgroundProcessor.start(org.ldk.structs.ChannelManagerPersister.new_impl(channel_manager -> {
             event_handler.persist_manager(channel_manager.write());
             return Result_NoneErrorZ.ok();
-        }), org.ldk.structs.EventHandler.new_impl(event_handler::handle_event),
-        this.chain_monitor, this.channel_manager, this.router, this.peer_manager, this.logger);
+        }), ldk_handler, this.chain_monitor, this.channel_manager, this.graph_msg_handler, this.peer_manager, this.logger);
     }
 
     /**