Warn user when free disk space is too low.

core/src/main/java/bisq/core/app/BisqHeadlessApp.java

@@ -78,6 +78,7 @@ protected void setupHandlers() {
         bisqSetup.setDisplayTorNetworkSettingsHandler(show -> log.info("onDisplayTorNetworkSettingsHandler: show={}", show));
         bisqSetup.setSpvFileCorruptedHandler(msg -> log.error("onSpvFileCorruptedHandler: msg={}", msg));
         bisqSetup.setChainFileLockedExceptionHandler(msg -> log.error("onChainFileLockedExceptionHandler: msg={}", msg));
+        bisqSetup.setDiskSpaceWarningHandler(msg -> log.error("onDiskSpaceWarningHandler: msg={}", msg));
         bisqSetup.setLockedUpFundsHandler(msg -> log.info("onLockedUpFundsHandler: msg={}", msg));
         bisqSetup.setShowFirstPopupIfResyncSPVRequestedHandler(() -> log.info("onShowFirstPopupIfResyncSPVRequestedHandler"));
         bisqSetup.setRequestWalletPasswordHandler(aesKeyHandler -> log.info("onRequestWalletPasswordHandler"));

core/src/main/java/bisq/core/app/BisqSetup.java

@@ -107,6 +107,8 @@
 
 import javax.annotation.Nullable;
 
+import static bisq.core.util.FormattingUtils.formatBytes;
+
 @Slf4j
 @Singleton
 public class BisqSetup {
@@ -162,7 +164,7 @@ default void onRequestWalletPassword() {
             filterWarningHandler, displaySecurityRecommendationHandler, displayLocalhostHandler,
             wrongOSArchitectureHandler, displaySignedByArbitratorHandler,
             displaySignedByPeerHandler, displayPeerLimitLiftedHandler, displayPeerSignerHandler,
-            rejectedTxErrorMessageHandler;
+            rejectedTxErrorMessageHandler, diskSpaceWarningHandler;
     @Setter
     @Nullable
     private Consumer<Boolean> displayTorNetworkSettingsHandler;
@@ -462,8 +464,10 @@ private void initWallet() {
                 walletPasswordHandler,
                 () -> {
                     if (allBasicServicesInitialized) {
+                        // the following are called each time a block is received
                         checkForLockedUpFunds();
                         checkForInvalidMakerFeeTxs();
+                        checkFreeDiskSpace();
                     }
                 },
                 () -> walletInitialized.set(true));
@@ -547,6 +551,18 @@ private void checkForInvalidMakerFeeTxs() {
         });
     }
 
+    private void checkFreeDiskSpace() {
+        long TWO_GIGABYTES = 2147483648L;
+        long usableSpace = new File(Config.appDataDir(), VERSION_FILE_NAME).getUsableSpace();
+        if (usableSpace < TWO_GIGABYTES) {
+            String message = Res.get("popup.warning.diskSpace", formatBytes(usableSpace), formatBytes(TWO_GIGABYTES));
+            log.warn(message);
+            if (diskSpaceWarningHandler != null) {
+                diskSpaceWarningHandler.accept(message);
+            }
+        }
+    }
+
     @Nullable
     public static String getLastBisqVersion() {
         File versionFile = getVersionFile();

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

@@ -1,4 +1,3 @@
-# Keep display strings organized by domain
 # Naming convention: We use camelCase and dot separated name spaces.
 # Use as many sub spaces as required to make the structure clear, but as little as possible.
 # E.g.: [main-view].[component].[description]
@@ -3202,6 +3201,10 @@ popup.warning.openOfferWithInvalidMakerFeeTx=The maker fee transaction for offer
   Please go to \"Settings/Network info\" and do a SPV resync.\n\
   For further help please contact the Bisq support channel at the Bisq Matrix Space.
 
+popup.warning.diskSpace=You have less than 2 GB free disk space left.\n\
+  Free space={0}, required space={1}.\n\n\
+  Please free up some disk space to continue running Bisq.
+
 popup.info.securityDepositInfo=To ensure both traders follow the trade protocol, both traders need to pay a security \
 deposit.\n\nThis deposit is kept in your trade wallet until your trade has been successfully completed, and then it's \
 refunded to you.\n\nPlease note: if you're creating a new offer, Bisq needs to be running for another trader to take \

desktop/src/main/java/bisq/desktop/main/MainViewModel.java

@@ -27,6 +27,7 @@
 import bisq.desktop.main.overlays.notifications.Notification;
 import bisq.desktop.main.overlays.notifications.NotificationCenter;
 import bisq.desktop.main.overlays.popups.Popup;
+import bisq.desktop.main.overlays.popups.PopupManager;
 import bisq.desktop.main.overlays.windows.DisplayAlertMessageWindow;
 import bisq.desktop.main.overlays.windows.TacWindow;
 import bisq.desktop.main.overlays.windows.TorNetworkSettingsWindow;
@@ -392,6 +393,13 @@ private void setupHandlers() {
         bisqSetup.setChainFileLockedExceptionHandler(msg -> new Popup().warning(msg)
                 .useShutDownButton()
                 .show());
+
+        bisqSetup.setDiskSpaceWarningHandler(msg -> {
+            if (PopupManager.isNoPopupDisplayed()) {
+                new Popup().warning(msg).show();
+            }
+        });
+
         bisqSetup.setLockedUpFundsHandler(msg -> {
             // repeated popups of the same message text can be stopped by selecting the "Dont show again" checkbox
             String key = Hex.encode(Hash.getSha256Ripemd160hash(msg.getBytes(Charsets.UTF_8)));

desktop/src/main/java/bisq/desktop/main/overlays/popups/PopupManager.java

@@ -40,6 +40,10 @@ public static void queueForDisplay(Popup popup) {
         displayNext();
     }
 
+    public static boolean isNoPopupDisplayed() {
+        return displayedPopup == null;
+    }
+
     public static void onHidden(Popup popup) {
         if (displayedPopup == null || displayedPopup == popup) {
             displayedPopup = null;