prompt to fall back on startup error with custom node

core/src/main/java/haveno/core/api/XmrConnectionService.java

@@ -43,6 +43,7 @@ import java.util.Set;
 
 import org.apache.commons.lang3.exception.ExceptionUtils;
 
+import javafx.beans.property.BooleanProperty;
 import javafx.beans.property.IntegerProperty;
 import javafx.beans.property.LongProperty;
 import javafx.beans.property.ObjectProperty;
@@ -50,6 +51,7 @@ import javafx.beans.property.ReadOnlyDoubleProperty;
 import javafx.beans.property.ReadOnlyIntegerProperty;
 import javafx.beans.property.ReadOnlyLongProperty;
 import javafx.beans.property.ReadOnlyObjectProperty;
+import javafx.beans.property.SimpleBooleanProperty;
 import javafx.beans.property.SimpleIntegerProperty;
 import javafx.beans.property.SimpleLongProperty;
 import javafx.beans.property.SimpleObjectProperty;
@@ -89,6 +91,8 @@ public final class XmrConnectionService {
     private final LongProperty chainHeight = new SimpleLongProperty(0);
     private final DownloadListener downloadListener = new DownloadListener();
     @Getter
+    private final BooleanProperty connectionServiceFallbackHandlerActive = new SimpleBooleanProperty();
+    @Getter
     private final StringProperty connectionServiceErrorMsg = new SimpleStringProperty();
     private final LongProperty numUpdates = new SimpleLongProperty(0);
     private Socks5ProxyProvider socks5ProxyProvider;
@@ -99,6 +103,7 @@ public final class XmrConnectionService {
     private Boolean isConnected = false;
     @Getter
     private MoneroDaemonInfo lastInfo;
+    private Long lastFallbackInvocation;
     private Long lastLogPollErrorTimestamp;
     private long lastLogDaemonNotSyncedTimestamp;
     private Long syncStartHeight;
@@ -115,6 +120,8 @@ public final class XmrConnectionService {
     private int numRequestsLastMinute;
     private long lastSwitchTimestamp;
     private Set<MoneroRpcConnection> excludedConnections = new HashSet<>();
+    private static final long FALLBACK_INVOCATION_PERIOD_MS = 1000 * 60 * 1; // offer to fallback up to once every minute
+    private boolean fallbackApplied;
 
     @Inject
     public XmrConnectionService(P2PService p2PService,
@@ -424,6 +431,19 @@ public final class XmrConnectionService {
         return numUpdates;
     }
 
+    public void fallbackToBestConnection() {
+        if (isShutDownStarted) return;
+        if (xmrNodes.getProvidedXmrNodes().isEmpty()) {
+            log.warn("Falling back to public nodes");
+            preferences.setMoneroNodesOptionOrdinal(XmrNodes.MoneroNodesOption.PUBLIC.ordinal());
+        } else {
+            log.warn("Falling back to provided nodes");
+            preferences.setMoneroNodesOptionOrdinal(XmrNodes.MoneroNodesOption.PROVIDED.ordinal());
+        }
+        fallbackApplied = true;
+        initializeConnections();
+    }
+
     // ------------------------------- HELPERS --------------------------------
 
     private void doneDownload() {
@@ -533,7 +553,7 @@ public final class XmrConnectionService {
             }
 
             // restore connections
-            if ("".equals(config.xmrNode)) {
+            if (!isFixedConnection()) {
 
                 // load previous or default connections
                 if (coreContext.isApiUser()) {
@@ -569,10 +589,7 @@ public final class XmrConnectionService {
                 }
 
                 // restore last connection
-                if (isFixedConnection()) {
-                    if (getConnections().size() != 1) throw new IllegalStateException("Expected connection list to have 1 fixed connection but was: " + getConnections().size());
-                    connectionManager.setConnection(getConnections().get(0));
-                } else if (connectionList.getCurrentConnectionUri().isPresent() && connectionManager.hasConnection(connectionList.getCurrentConnectionUri().get())) {
+                if (connectionList.getCurrentConnectionUri().isPresent() && connectionManager.hasConnection(connectionList.getCurrentConnectionUri().get())) {
                     if (!xmrLocalNode.shouldBeIgnored() || !xmrLocalNode.equalsUri(connectionList.getCurrentConnectionUri().get())) {
                         connectionManager.setConnection(connectionList.getCurrentConnectionUri().get());
                     }
@@ -592,7 +609,7 @@ public final class XmrConnectionService {
                 maybeStartLocalNode();
 
                 // update connection
-                if (!isFixedConnection() && (connectionManager.getConnection() == null || connectionManager.getAutoSwitch())) {
+                if (connectionManager.getConnection() == null || connectionManager.getAutoSwitch()) {
                     MoneroRpcConnection bestConnection = getBestAvailableConnection();
                     if (bestConnection != null) setConnection(bestConnection);
                 }
@@ -614,6 +631,7 @@ public final class XmrConnectionService {
         }
 
         // notify initial connection
+        lastRefreshPeriodMs = getRefreshPeriodMs();
         onConnectionChanged(connectionManager.getConnection());
     }
 
@@ -716,16 +734,14 @@ public final class XmrConnectionService {
                     // skip handling if shutting down
                     if (isShutDownStarted) return;
 
-                    // fallback to provided or public nodes if custom connection fails on startup
-                    if (lastInfo == null && "".equals(config.xmrNode) && preferences.getMoneroNodesOption() == XmrNodes.MoneroNodesOption.CUSTOM) {
-                        if (xmrNodes.getProvidedXmrNodes().isEmpty()) {
-                            log.warn("Failed to fetch daemon info from custom node on startup, falling back to public nodes: " + e.getMessage());
-                            preferences.setMoneroNodesOptionOrdinal(XmrNodes.MoneroNodesOption.PUBLIC.ordinal());
-                        } else {
-                            log.warn("Failed to fetch daemon info from custom node on startup, falling back to provided nodes: " + e.getMessage());
-                            preferences.setMoneroNodesOptionOrdinal(XmrNodes.MoneroNodesOption.PROVIDED.ordinal());
+                    // invoke fallback handling on startup error
+                    boolean canFallback = isFixedConnection() || isCustomConnections();
+                    if (lastInfo == null && canFallback) {
+                        if (!connectionServiceFallbackHandlerActive.get() && (lastFallbackInvocation == null || System.currentTimeMillis() - lastFallbackInvocation > FALLBACK_INVOCATION_PERIOD_MS)) {
+                            log.warn("Failed to fetch daemon info from custom connection on startup: " + e.getMessage());
+                            lastFallbackInvocation = System.currentTimeMillis();
+                            connectionServiceFallbackHandlerActive.set(true);
                         }
-                        initializeConnections();
                         return;
                     }
 
@@ -819,6 +835,10 @@ public final class XmrConnectionService {
     }
 
     private boolean isFixedConnection() {
-        return !"".equals(config.xmrNode) || preferences.getMoneroNodesOption() == XmrNodes.MoneroNodesOption.CUSTOM;
+        return !"".equals(config.xmrNode) && !fallbackApplied;
+    }
+
+    private boolean isCustomConnections() {
+        return preferences.getMoneroNodesOption() == XmrNodes.MoneroNodesOption.CUSTOM;
     }
 }

core/src/main/java/haveno/core/app/HavenoHeadlessApp.java

@@ -75,6 +75,7 @@ public class HavenoHeadlessApp implements HeadlessApp {
             log.info("onDisplayTacHandler: We accept the tacs automatically in headless mode");
             acceptedHandler.run();
         });
+        havenoSetup.setDisplayMoneroConnectionFallbackHandler(show -> log.info("onDisplayMoneroConnectionFallbackHandler: show={}", show));
         havenoSetup.setDisplayTorNetworkSettingsHandler(show -> log.info("onDisplayTorNetworkSettingsHandler: show={}", show));
         havenoSetup.setChainFileLockedExceptionHandler(msg -> log.error("onChainFileLockedExceptionHandler: msg={}", msg));
         tradeManager.setLockedUpFundsHandler(msg -> log.info("onLockedUpFundsHandler: msg={}", msg));

core/src/main/java/haveno/core/app/HavenoSetup.java

@@ -158,6 +158,9 @@ public class HavenoSetup {
             rejectedTxErrorMessageHandler;
     @Setter
     @Nullable
+    private Consumer<Boolean> displayMoneroConnectionFallbackHandler;        
+    @Setter
+    @Nullable
     private Consumer<Boolean> displayTorNetworkSettingsHandler;
     @Setter
     @Nullable
@@ -426,6 +429,12 @@ public class HavenoSetup {
         getXmrDaemonSyncProgress().addListener((observable, oldValue, newValue) -> resetStartupTimeout());
         getXmrWalletSyncProgress().addListener((observable, oldValue, newValue) -> resetStartupTimeout());
 
+        // listen for fallback handling
+        getConnectionServiceFallbackHandlerActive().addListener((observable, oldValue, newValue) -> {
+            if (displayMoneroConnectionFallbackHandler == null) return;
+            displayMoneroConnectionFallbackHandler.accept(newValue);
+        });
+
         log.info("Init P2P network");
         havenoSetupListeners.forEach(HavenoSetupListener::onInitP2pNetwork);
         p2pNetworkReady = p2PNetworkSetup.init(this::initWallet, displayTorNetworkSettingsHandler);
@@ -725,6 +734,10 @@ public class HavenoSetup {
         return xmrConnectionService.getConnectionServiceErrorMsg();
     }
 
+    public BooleanProperty getConnectionServiceFallbackHandlerActive() {
+        return xmrConnectionService.getConnectionServiceFallbackHandlerActive();
+    }
+
     public StringProperty getTopErrorMsg() {
         return topErrorMsg;
     }

core/src/main/java/haveno/core/app/WalletAppSetup.java

@@ -120,7 +120,7 @@ public class WalletAppSetup {
               @Nullable Runnable showPopupIfInvalidBtcConfigHandler,
               Runnable downloadCompleteHandler,
               Runnable walletInitializedHandler) {
-        log.info("Initialize WalletAppSetup with monero-java version {}", MoneroUtils.getVersion());
+        log.info("Initialize WalletAppSetup with monero-java v{}", MoneroUtils.getVersion());
 
         ObjectProperty<Throwable> walletServiceException = new SimpleObjectProperty<>();
         xmrInfoBinding = EasyBind.combine(

core/src/main/java/haveno/core/xmr/wallet/XmrWalletService.java

@@ -1298,9 +1298,10 @@ public class XmrWalletService extends XmrWalletBase {
             } else {
 
                 // force restart main wallet if connection changed while syncing
-                log.warn("Force restarting main wallet because connection changed while syncing");
-                forceRestartMainWallet();
-                return;
+                if (wallet != null) {
+                    log.warn("Force restarting main wallet because connection changed while syncing");
+                    forceRestartMainWallet();
+                }
             }
         });
 

core/src/main/resources/i18n/displayStrings.properties

@@ -2044,6 +2044,9 @@ closedTradesSummaryWindow.totalTradeFeeInXmr.title=Sum of all trade fees paid in
 closedTradesSummaryWindow.totalTradeFeeInXmr.value={0} ({1} of total trade amount)
 walletPasswordWindow.headline=Enter password to unlock
 
+connectionFallback.headline=Connection error
+connectionFallback.msg=Error connecting to your custom Monero node(s).\n\nDo you want to try the next best available Monero node?
+
 torNetworkSettingWindow.header=Tor networks settings
 torNetworkSettingWindow.noBridges=Don't use bridges
 torNetworkSettingWindow.providedBridges=Connect with provided bridges

desktop/src/main/java/haveno/desktop/main/MainView.java

@@ -674,6 +674,7 @@ public class MainView extends InitializableView<StackPane, MainViewModel>  {
                 }
             } else {
                 xmrInfoLabel.setId("footer-pane");
+                xmrInfoLabel.getStyleClass().remove("error-text");
                 if (xmrNetworkWarnMsgPopup != null)
                     xmrNetworkWarnMsgPopup.hide();
             }

desktop/src/main/java/haveno/desktop/main/MainViewModel.java

@@ -140,6 +140,7 @@ public class MainViewModel implements ViewModel, HavenoSetup.HavenoSetupListener
     @SuppressWarnings("FieldCanBeLocal")
     private MonadicBinding<Boolean> tradesAndUIReady;
     private final Queue<Overlay<?>> popupQueue = new PriorityQueue<>(Comparator.comparing(Overlay::getDisplayOrderPriority));
+    private Popup moneroConnectionFallbackPopup;
 
 
     ///////////////////////////////////////////////////////////////////////////////////////////
@@ -334,9 +335,38 @@ public class MainViewModel implements ViewModel, HavenoSetup.HavenoSetupListener
             tacWindow.onAction(acceptedHandler::run).show();
         }, 1));
 
+        havenoSetup.setDisplayMoneroConnectionFallbackHandler(show -> {
+            if (moneroConnectionFallbackPopup == null) {
+                moneroConnectionFallbackPopup = new Popup()
+                    .headLine(Res.get("connectionFallback.headline"))
+                    .warning(Res.get("connectionFallback.msg"))
+                    .closeButtonText(Res.get("shared.no"))
+                    .actionButtonText(Res.get("shared.yes"))
+                    .onAction(() -> {
+                        havenoSetup.getConnectionServiceFallbackHandlerActive().set(false);
+                        new Thread(() -> HavenoUtils.xmrConnectionService.fallbackToBestConnection()).start();
+                    })
+                    .onClose(() -> {
+                        log.warn("User has declined to fallback to the next best available Monero node.");
+                        havenoSetup.getConnectionServiceFallbackHandlerActive().set(false);
+                    });
+            }
+            if (show) {
+                moneroConnectionFallbackPopup.show();
+            } else if (moneroConnectionFallbackPopup.isDisplayed()) {
+                moneroConnectionFallbackPopup.hide();
+            }
+        });
+        
         havenoSetup.setDisplayTorNetworkSettingsHandler(show -> {
             if (show) {
                 torNetworkSettingsWindow.show();
+
+                // bring connection fallback popup to front if displayed
+                if (moneroConnectionFallbackPopup != null && moneroConnectionFallbackPopup.isDisplayed()) {
+                    moneroConnectionFallbackPopup.hide();
+                    moneroConnectionFallbackPopup.show();
+                }
             } else if (torNetworkSettingsWindow.isDisplayed()) {
                 torNetworkSettingsWindow.hide();
             }