Fix API call POST /peers so it returns "false" for existing peer, instead of throwing / Internal Server Error

src/main/java/org/qortal/api/resource/PeersResource.java

@@ -8,7 +8,7 @@ import io.swagger.v3.oas.annotations.parameters.RequestBody;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
-import java.util.Arrays;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -169,13 +169,14 @@ public class PeersResource {
 		try {
 			PeerAddress peerAddress = PeerAddress.fromString(address);
 
-			Network.getInstance().mergePeers("API", addedWhen, Arrays.asList(peerAddress));
+			List<PeerAddress> newPeerAddresses = new ArrayList<>(1);
+			newPeerAddresses.add(peerAddress);
 
-			return "true";
+			boolean addResult = Network.getInstance().mergePeers("API", addedWhen, newPeerAddresses);
+
+			return addResult ? "true" : "false";
 		} catch (IllegalArgumentException e) {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_NETWORK_ADDRESS);
-		} catch (ApiException e) {
-			throw e;
 		} catch (DataException e) {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
 		}

src/main/java/org/qortal/network/Network.java

@@ -1123,11 +1123,11 @@ public class Network {
 		}
 	}
 
-	public void mergePeers(String addedBy, long addedWhen, List<PeerAddress> peerAddresses) throws DataException {
+	public boolean mergePeers(String addedBy, long addedWhen, List<PeerAddress> peerAddresses) throws DataException {
 		mergePeersLock.lock();
 
 		try (final Repository repository = RepositoryManager.getRepository()) {
-			this.mergePeers(repository, addedBy, addedWhen, peerAddresses);
+			return this.mergePeers(repository, addedBy, addedWhen, peerAddresses);
 		} finally {
 			mergePeersLock.unlock();
 		}
@@ -1158,7 +1158,7 @@ public class Network {
 		}
 	}
 
-	private void mergePeers(Repository repository, String addedBy, long addedWhen, List<PeerAddress> peerAddresses) throws DataException {
+	private boolean mergePeers(Repository repository, String addedBy, long addedWhen, List<PeerAddress> peerAddresses) throws DataException {
 		List<PeerData> newPeers;
 		synchronized (this.allKnownPeers) {
 			for (PeerData knownPeerData : this.allKnownPeers) {
@@ -1167,6 +1167,9 @@ public class Network {
 				peerAddresses.removeIf(isKnownAddress);
 			}
 
+			if (peerAddresses.isEmpty())
+				return false;
+
 			// Add leftover peer addresses to known peers list
 			newPeers = peerAddresses.stream().map(peerAddress -> new PeerData(peerAddress, addedWhen, addedBy)).collect(Collectors.toList());
 
@@ -1184,6 +1187,8 @@ public class Network {
 				LOGGER.error(String.format("Repository issue while merging peers list from %s", addedBy), e);
 				throw e;
 			}
+
+			return true;
 		}
 	}