1 files changed, 182 insertions, 0 deletions
diff --git a/lib/private/TextProcessing/Manager.php b/lib/private/TextProcessing/Manager.php
new file mode 100644
index 00000000000..34e4b2bb4cc
--- /dev/null
+++ b/lib/private/TextProcessing/Manager.php
@@ -0,0 +1,182 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Marcel Klehr <mklehr@gmx.net>
+ *
+ * @author Marcel Klehr <mklehr@gmx.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OC\TextProcessing;
+
+use OC\AppFramework\Bootstrap\Coordinator;
+use OC\TextProcessing\Db\Task as DbTask;
+use \OCP\TextProcessing\Task as OCPTask;
+use OC\TextProcessing\Db\TaskMapper;
+use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Db\MultipleObjectsReturnedException;
+use OCP\BackgroundJob\IJobList;
+use OCP\Common\Exception\NotFoundException;
+use OCP\DB\Exception;
+use OCP\IServerContainer;
+use OCP\TextProcessing\IManager;
+use OCP\TextProcessing\IProvider;
+use OCP\PreConditionNotMetException;
+use Psr\Log\LoggerInterface;
+use RuntimeException;
+use Throwable;
+
+class Manager implements IManager {
+	/** @var ?IProvider[] */
+	private ?array $providers = null;
+
+	public function __construct(
+		private IServerContainer $serverContainer,
+		private Coordinator $coordinator,
+		private LoggerInterface $logger,
+		private IJobList $jobList,
+		private TaskMapper $taskMapper,
+	) {
+	}
+
+	public function getProviders(): array {
+		$context = $this->coordinator->getRegistrationContext();
+		if ($context === null) {
+			return [];
+		}
+
+		if ($this->providers !== null) {
+			return $this->providers;
+		}
+
+		$this->providers = [];
+
+		foreach ($context->getTextProcessingProviders() as $providerServiceRegistration) {
+			$class = $providerServiceRegistration->getService();
+			try {
+				$this->providers[$class] = $this->serverContainer->get($class);
+			} catch (Throwable $e) {
+				$this->logger->error('Failed to load Text processing provider ' . $class, [
+					'exception' => $e,
+				]);
+			}
+		}
+
+		return $this->providers;
+	}
+
+	public function hasProviders(): bool {
+		$context = $this->coordinator->getRegistrationContext();
+		if ($context === null) {
+			return false;
+		}
+		return count($context->getTextProcessingProviders()) > 0;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getAvailableTaskTypes(): array {
+		$tasks = [];
+		foreach ($this->getProviders() as $provider) {
+			$tasks[$provider->getTaskType()] = true;
+		}
+		return array_keys($tasks);
+	}
+
+	public function canHandleTask(OCPTask $task): bool {
+		return in_array($task->getType(), $this->getAvailableTaskTypes());
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function runTask(OCPTask $task): string {
+		if (!$this->canHandleTask($task)) {
+			throw new PreConditionNotMetException('No text processing provider is installed that can handle this task');
+		}
+		foreach ($this->getProviders() as $provider) {
+			if (!$task->canUseProvider($provider)) {
+				continue;
+			}
+			try {
+				$task->setStatus(OCPTask::STATUS_RUNNING);
+				if ($task->getId() === null) {
+					$taskEntity = $this->taskMapper->insert(DbTask::fromPublicTask($task));
+					$task->setId($taskEntity->getId());
+				} else {
+					$this->taskMapper->update(DbTask::fromPublicTask($task));
+				}
+				$output = $task->visitProvider($provider);
+				$task->setOutput($output);
+				$task->setStatus(OCPTask::STATUS_SUCCESSFUL);
+				$this->taskMapper->update(DbTask::fromPublicTask($task));
+				return $output;
+			} catch (\RuntimeException $e) {
+				$this->logger->info('LanguageModel call using provider ' . $provider->getName() . ' failed', ['exception' => $e]);
+				$task->setStatus(OCPTask::STATUS_FAILED);
+				$this->taskMapper->update(DbTask::fromPublicTask($task));
+				throw $e;
+			} catch (\Throwable $e) {
+				$this->logger->info('LanguageModel call using provider ' . $provider->getName() . ' failed', ['exception' => $e]);
+				$task->setStatus(OCPTask::STATUS_FAILED);
+				$this->taskMapper->update(DbTask::fromPublicTask($task));
+				throw new RuntimeException('LanguageModel call using provider ' . $provider->getName() . ' failed: ' . $e->getMessage(), 0, $e);
+			}
+		}
+
+		throw new RuntimeException('Could not run task');
+	}
+
+	/**
+	 * @inheritDoc
+	 * @throws Exception
+	 */
+	public function scheduleTask(OCPTask $task): void {
+		if (!$this->canHandleTask($task)) {
+			throw new PreConditionNotMetException('No LanguageModel provider is installed that can handle this task');
+		}
+		$task->setStatus(OCPTask::STATUS_SCHEDULED);
+		$taskEntity = DbTask::fromPublicTask($task);
+		$this->taskMapper->insert($taskEntity);
+		$task->setId($taskEntity->getId());
+		$this->jobList->add(TaskBackgroundJob::class, [
+			'taskId' => $task->getId()
+		]);
+	}
+
+	/**
+	 * @param int $id The id of the task
+	 * @return OCPTask
+	 * @throws RuntimeException If the query failed
+	 * @throws NotFoundException If the task could not be found
+	 */
+	public function getTask(int $id): OCPTask {
+		try {
+			$taskEntity = $this->taskMapper->find($id);
+			return $taskEntity->toPublicTask();
+		} catch (DoesNotExistException $e) {
+			throw new NotFoundException('Could not find task with the provided id');
+		} catch (MultipleObjectsReturnedException $e) {
+			throw new RuntimeException('Could not uniquely identify task with given id', 0, $e);
+		} catch (Exception $e) {
+			throw new RuntimeException('Failure while trying to find task by id: '.$e->getMessage(), 0, $e);
+		}
+	}
+}