fix(TaskProcessing): increase error_message column length

Signed-off-by: Anupam Kumar <kyteinsky@gmail.com>

core/Migrations/Version30000Date20240906095113.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Core\Migrations;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\Attributes\ModifyColumn;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+#[ModifyColumn(table: 'taskprocessing_tasks', name: 'error_message', description: 'Increase column length to 4000 bytes to support longer error messages')]
+class Version30000Date20240906095113 extends SimpleMigrationStep {
+
+	/**
+	 * @param IOutput $output
+	 * @param Closure(): ISchemaWrapper $schemaClosure
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable('taskprocessing_tasks');
+		$column = $table->getColumn('error_message');
+
+		if ($column->getLength() < 4000) {
+			$column->setLength(4000);
+		}
+
+		return $schema;
+	}
+}

lib/private/TaskProcessing/Manager.php

@@ -891,7 +891,8 @@ class Manager implements IManager {
 		if ($error !== null) {
 			$task->setStatus(Task::STATUS_FAILED);
 			$task->setEndedAt(time());
-			$task->setErrorMessage($error);
+			// truncate error message to 1000 characters
+			$task->setErrorMessage(mb_substr($error, 0, 1000));
 			$this->logger->warning('A TaskProcessing ' . $task->getTaskTypeId() . ' task with id ' . $id . ' failed with the following message: ' . $error);
 		} elseif ($result !== null) {
 			$taskTypes = $this->getAvailableTaskTypes();
@@ -956,7 +957,7 @@ class Manager implements IManager {
 			$this->taskMapper->update($taskEntity);
 			$this->runWebhook($task);
 		} catch (\OCP\DB\Exception $e) {
-			throw new \OCP\TaskProcessing\Exception\Exception('There was a problem finding the task', 0, $e);
+			throw new \OCP\TaskProcessing\Exception\Exception($e->getMessage());
 		}
 		if ($task->getStatus() === Task::STATUS_SUCCESSFUL) {
 			$event = new TaskSuccessfulEvent($task);