retrieve fee rates from configured source on non-mainnet networks where available

src/main/java/com/sparrowwallet/sparrow/AppServices.java

@@ -293,7 +293,7 @@ public class AppServices {
 
             FeeRatesSource feeRatesSource = Config.get().getFeeRatesSource();
             feeRatesSource = (feeRatesSource == null ? FeeRatesSource.MEMPOOL_SPACE : feeRatesSource);
-            if(event instanceof ConnectionEvent && Network.get().equals(Network.MAINNET) && feeRatesSource.isExternal()) {
+            if(event instanceof ConnectionEvent && feeRatesSource.supportsNetwork(Network.get()) && feeRatesSource.isExternal()) {
                 EventManager.get().post(new FeeRatesSourceChangedEvent(feeRatesSource));
             }
         });

src/main/java/com/sparrowwallet/sparrow/net/ElectrumServer.java

@@ -823,7 +823,7 @@ public class ElectrumServer {
             if(AppServices.getTargetBlockFeeRates() != null) {
                 targetBlocksFeeRatesSats.putAll(AppServices.getTargetBlockFeeRates());
             }
-        } else if(Network.get().equals(Network.MAINNET)) {
+        } else if(feeRatesSource.supportsNetwork(Network.get())) {
             targetBlocksFeeRatesSats.putAll(feeRatesSource.getBlockTargetFeeRates(targetBlocksFeeRatesSats));
         }
 

src/main/java/com/sparrowwallet/sparrow/net/FeeRatesSource.java

@@ -1,5 +1,6 @@
 package com.sparrowwallet.sparrow.net;
 
+import com.sparrowwallet.drongo.Network;
 import com.sparrowwallet.sparrow.AppServices;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -14,13 +15,26 @@ public enum FeeRatesSource {
         public Map<Integer, Double> getBlockTargetFeeRates(Map<Integer, Double> defaultblockTargetFeeRates) {
             return Collections.emptyMap();
         }
+
+        @Override
+        public boolean supportsNetwork(Network network) {
+            return true;
+        }
     },
     MEMPOOL_SPACE("mempool.space", true) {
         @Override
         public Map<Integer, Double> getBlockTargetFeeRates(Map<Integer, Double> defaultblockTargetFeeRates) {
             String url = AppServices.isUsingProxy() ? "http://mempoolhqx4isw62xs7abwphsq7ldayuidyx2v2oethdhhj6mlo2r6ad.onion/api/v1/fees/recommended" : "https://mempool.space/api/v1/fees/recommended";
+            if(Network.get() != Network.MAINNET && supportsNetwork(Network.get())) {
+                url = url.replace("/api/", "/" + Network.get().getName() + "/api/");
+            }
             return getThreeTierFeeRates(this, defaultblockTargetFeeRates, url);
         }
+
+        @Override
+        public boolean supportsNetwork(Network network) {
+            return network == Network.MAINNET || network == Network.TESTNET || network == Network.TESTNET4 || network == Network.SIGNET;
+        }
     },
     BITCOINFEES_EARN_COM("bitcoinfees.earn.com", true) {
         @Override
@@ -28,6 +42,11 @@ public enum FeeRatesSource {
             String url = "https://bitcoinfees.earn.com/api/v1/fees/recommended";
             return getThreeTierFeeRates(this, defaultblockTargetFeeRates, url);
         }
+
+        @Override
+        public boolean supportsNetwork(Network network) {
+            return network == Network.MAINNET;
+        }
     },
     MINIMUM("Minimum (1 sat/vB)", false) {
         @Override
@@ -39,6 +58,11 @@ public enum FeeRatesSource {
 
             return blockTargetFeeRates;
         }
+
+        @Override
+        public boolean supportsNetwork(Network network) {
+            return true;
+        }
     },
     OXT_ME("oxt.me", true) {
         @Override
@@ -47,6 +71,11 @@ public enum FeeRatesSource {
             return getThreeTierFeeRates(this, defaultblockTargetFeeRates, url);
         }
 
+        @Override
+        public boolean supportsNetwork(Network network) {
+            return network == Network.MAINNET;
+        }
+
         @Override
         protected ThreeTierRates getThreeTierRates(String url, HttpClientService httpClientService) throws Exception {
             OxtRates oxtRates = httpClientService.requestJson(url, OxtRates.class, null);
@@ -72,6 +101,8 @@ public enum FeeRatesSource {
 
     public abstract Map<Integer, Double> getBlockTargetFeeRates(Map<Integer, Double> defaultblockTargetFeeRates);
 
+    public abstract boolean supportsNetwork(Network network);
+
     public String getName() {
         return name;
     }
@@ -132,7 +163,7 @@ public enum FeeRatesSource {
         return name;
     }
 
-    private record ThreeTierRates(Double fastestFee, Double halfHourFee, Double hourFee, Double minimumFee) {}
+    protected record ThreeTierRates(Double fastestFee, Double halfHourFee, Double hourFee, Double minimumFee) {}
 
     private record OxtRates(OxtRatesData[] data) {}