add incoming-fee-rate and outgoing-fee-rate endpoints

application/src/main/java/de/cotto/lndmanagej/controller/ChannelIdConverter.java

@@ -0,0 +1,24 @@
+package de.cotto.lndmanagej.controller;
+
+import de.cotto.lndmanagej.model.ChannelId;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.Nonnull;
+
+@Component
+public class ChannelIdConverter implements Converter<String, ChannelId> {
+    public ChannelIdConverter() {
+        // default constructor
+    }
+
+    @Override
+    public ChannelId convert(@Nonnull String source) {
+        try {
+            long shortChannelId = Long.parseLong(source);
+            return ChannelId.fromShortChannelId(shortChannelId);
+        } catch (NumberFormatException numberFormatException) {
+            return ChannelId.fromCompactForm(source);
+        }
+    }
+}

application/src/main/java/de/cotto/lndmanagej/controller/LegacyController.java

@@ -5,6 +5,7 @@ import de.cotto.lndmanagej.model.ChannelId;
 import de.cotto.lndmanagej.model.LocalChannel;
 import de.cotto.lndmanagej.model.Pubkey;
 import de.cotto.lndmanagej.service.ChannelService;
+import de.cotto.lndmanagej.service.FeeService;
 import de.cotto.lndmanagej.service.NodeService;
 import de.cotto.lndmanagej.service.OwnNodeService;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -21,11 +22,18 @@ public class LegacyController {
     private final NodeService nodeService;
     private final ChannelService channelService;
     private final OwnNodeService ownNodeService;
+    private final FeeService feeService;
 
-    public LegacyController(NodeService nodeService, ChannelService channelService, OwnNodeService ownNodeService) {
+    public LegacyController(
+            NodeService nodeService,
+            ChannelService channelService,
+            OwnNodeService ownNodeService,
+            FeeService feeService
+    ) {
         this.nodeService = nodeService;
         this.channelService = channelService;
         this.ownNodeService = ownNodeService;
+        this.feeService = feeService;
     }
 
     @GetMapping("/node/{pubkey}/alias")
@@ -56,4 +64,14 @@ public class LegacyController {
     public boolean syncedToChain() {
         return ownNodeService.isSyncedToChain();
     }
+
+    @GetMapping("/channel/{channelId}/incoming-fee-rate")
+    public long getIncomingFeeRate(@PathVariable ChannelId channelId) {
+        return feeService.getIncomingFeeRate(channelId);
+    }
+
+    @GetMapping("/channel/{channelId}/outgoing-fee-rate")
+    public long getOutgoingFeeRate(@PathVariable ChannelId channelId) {
+        return feeService.getOutgoingFeeRate(channelId);
+    }
 }

application/src/main/java/de/cotto/lndmanagej/service/FeeService.java

@@ -0,0 +1,22 @@
+package de.cotto.lndmanagej.service;
+
+import de.cotto.lndmanagej.grpc.GrpcFees;
+import de.cotto.lndmanagej.model.ChannelId;
+import org.springframework.stereotype.Component;
+
+@Component
+public class FeeService {
+    private final GrpcFees grpcFees;
+
+    public FeeService(GrpcFees grpcFees) {
+        this.grpcFees = grpcFees;
+    }
+
+    public long getIncomingFeeRate(ChannelId channelId) {
+        return grpcFees.getIncomingFeeRate(channelId).orElseThrow(IllegalStateException::new);
+    }
+
+    public long getOutgoingFeeRate(ChannelId channelId) {
+        return grpcFees.getOutgoingFeeRate(channelId).orElseThrow(IllegalStateException::new);
+    }
+}