Fix: park the client if cache-dir has been deleted

src/main/java/com/sheepit/client/Client.java

@@ -53,6 +53,7 @@ import com.sheepit.client.datamodel.client.Error.ServerCode;
 import com.sheepit.client.datamodel.client.Error.Type;
 import com.sheepit.client.datamodel.server.Chunk;
 import com.sheepit.client.exception.SheepItException;
+import com.sheepit.client.exception.SheepItExceptionCacheDirDeleted;
 import com.sheepit.client.exception.SheepItExceptionNoRendererAvailable;
 import com.sheepit.client.exception.SheepItExceptionNoRightToRender;
 import com.sheepit.client.exception.SheepItExceptionNoSession;
@@ -756,6 +757,9 @@ import okhttp3.HttpUrl;
 			else if (e instanceof SheepItExceptionNoWritePermission) {
 				return Error.Type.NO_WRITE_PERMISSION;
 			}
+			else if (e instanceof SheepItExceptionCacheDirDeleted) {
+				return Type.CACHE_DIR_DELETED;
+			}
 			else {
 				return Error.Type.UNKNOWN;
 			}
@@ -822,6 +826,7 @@ import okhttp3.HttpUrl;
 					this.serverRequest,
 					this.gui,
 					this.log,
+					this.directoryManager,
 					this.directoryManager.getActualStoragePathFor(chunk),
 					chunk.getMd5(),
 					String.format(LOCALE, "%s?chunk=%s", this.serverRequest.getPage("download-chunk"), chunk.getId())
@@ -842,14 +847,21 @@ import okhttp3.HttpUrl;
 				}
 			}
 		}
-		catch (ExecutionException | InterruptedException | TimeoutException e) {
-			
-			executor.shutdown();
+		catch (ExecutionException e) {
+			if (e.getCause() instanceof SheepItException) {
+				throw (SheepItException)e.getCause();
+			}
+			else {
+				this.log.error("downloadChunks failed " + e.getCause());
+			}
+		}
+		catch (InterruptedException | TimeoutException e) {
 			return Type.DOWNLOAD_FILE;
 		}
-
+		finally {
+			executor.shutdown();
+		}
 		
-		executor.shutdown();
 		return Type.OK;
 	}
 	

src/main/java/com/sheepit/client/datamodel/client/Error.java

@@ -59,6 +59,7 @@ public class Error {
 		CANNOT_READ_FILE(30),
 		DETECT_DEVICE_ERROR(31),
 		COLOR_MANAGEMENT_ERROR(33),
+		CACHE_DIR_DELETED(35),
 		
 		// internal error handling
 		NO_SPACE_LEFT_ON_DEVICE(100),
@@ -206,7 +207,7 @@ public class Error {
 			case RENDERER_KILLED_BY_USER_INCOMPATIBLE_PROCESS:
 				return "Stopped rendering: The incompatible user-specified process is running.";
 			case SESSION_DISABLED:
-				return "The server has disabled your session. Your client may have generated a broken frame (GPU not compatible, not enough RAM/VRAM, etc).";
+				return "The server has disabled your session. Your client may have generated a broken frame (GPU not compatible, not enough RAM/VRAM, etc) or your cache directory is not longer available.";
 			case RENDERER_NOT_AVAILABLE:
 				return "The official Blender builds don't support rendering on this hardware.";
 			case MISSING_RENDERER:
@@ -237,6 +238,8 @@ public class Error {
 				return "There was an error with your GPU or driver. Please ensure you have the latest driver and don't run extreme over/underclockings.";
 			case COLOR_MANAGEMENT_ERROR:
 				return "There was an error with the Color management. Please ensure you didn't set a weird OCIO config. Or the project might use an unsupported Color management configuration.";
+			case CACHE_DIR_DELETED:
+				return "Cache directory is missing, the client is now DEAD";
 			default:
 				return in.toString();
 		}

src/main/java/com/sheepit/client/exception/SheepItExceptionCacheDirDeleted.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2025 Laurent CLOUET
+ * Author Laurent CLOUET <laurent.clouet@nopnop.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package com.sheepit.client.exception;
+
+public class SheepItExceptionCacheDirDeleted extends SheepItException {
+	public SheepItExceptionCacheDirDeleted() {
+		super();
+	}
+	
+	public SheepItExceptionCacheDirDeleted(String message) {
+		super(message);
+	}
+}

src/main/java/com/sheepit/client/network/DownloadManager.java

@@ -18,11 +18,14 @@
  */
 package com.sheepit.client.network;
 
+import com.sheepit.client.config.DirectoryManager;
 import com.sheepit.client.datamodel.client.Error;
+import com.sheepit.client.exception.SheepItExceptionCacheDirDeleted;
 import com.sheepit.client.ui.Gui;
 import com.sheepit.client.logger.Log;
 import com.sheepit.client.utils.Utils;
 import com.sheepit.client.exception.SheepItException;
+import lombok.AllArgsConstructor;
 
 import java.io.File;
 import java.io.IOException;
@@ -33,28 +36,20 @@ import java.nio.file.Path;
 import java.util.Random;
 import java.util.concurrent.TimeUnit;
 
-public class DownloadManager {
+@AllArgsConstructor  public class DownloadManager {
 	private static int maxDownloadFileAttempts = 5;
 	
 	// global objects
 	private ServerRequest serverRequest;
 	private Gui gui;
 	private Log log;
+	private DirectoryManager directoryManager;
 	
 	// task specific objects
 	private String local_target;
 	private String md5; // expected md5 of the file, for check purpose
 	private String remote; // remote url
 	
-	public DownloadManager(ServerRequest serverRequest, Gui gui, Log log, String local_target, String md5, String remote) {
-		this.serverRequest = serverRequest;
-		this.gui = gui;
-		this.log = log;
-		this.local_target = local_target;
-		this.md5 = md5;
-		this.remote = remote;
-	}
-	
 	public Error.Type download() throws SheepItException {
 		File local_path_file = new File(this.local_target);
 		
@@ -175,7 +170,7 @@ public class DownloadManager {
 		return new File(this.local_target + ".partial").exists();
 	}
 	
-	private void createLock() {
+	private void createLock() throws SheepItExceptionCacheDirDeleted {
 		try {
 			File file = new File(this.local_target + ".partial");
 			file.createNewFile();
@@ -193,6 +188,16 @@ public class DownloadManager {
 				this.log.error("DownloadManager::createLock checking path info " + test_path + " exists? " + (new File(test_path).exists() ? "yes" : "no") + " is writeable? " + (Files.isWritable(Path.of(test_path)) ? "yes" : "no"));
 				current_path = test_path;
 			}
+			
+			File cache_dir = new File(this.local_target).getParentFile();
+			if (cache_dir.exists() == false) {
+				this.log.error("DownloadManager::createLock cache-dir has been deleted, it should not happen, park the client");
+				// it shouldn't happen, the client need a cache dir
+				
+				// 2 solutions: re-create the cache dir or park the client.
+				// we don't know why the cache dir was deleted so -> park the client
+				throw new SheepItExceptionCacheDirDeleted();
+			}
 		}
 	}