allow printing log messages during occ

Signed-off-by: Robin Appelman <robin@icewind.nl>

Author: icewind1991

appinfo/info.xml

@@ -11,6 +11,10 @@
 	<namespace>LogReader</namespace>
 	<default_enable/>
 
+	<types>
+		<logging/>
+	</types>
+
 	<category>tools</category>
 	<website>https://github.com/nextcloud/logreader</website>
 	<bugs>https://github.com/nextcloud/logreader/issues</bugs>

lib/AppInfo/Application.php

@@ -23,19 +23,22 @@
 
 namespace OCA\LogReader\AppInfo;
 
+use OCA\LogReader\Listener\LogListener;
 use OCA\LogReader\Log\Formatter;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IBootContext;
 use OCP\AppFramework\Bootstrap\IBootstrap;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
 use OCP\AppFramework\IAppContainer;
+use OCP\Log\BeforeMessageLoggedEvent;
 
 class Application extends App implements IBootstrap {
 	public function __construct(array $urlParams = []) {
 		parent::__construct('logreader', $urlParams);
 	}
 
 	public function register(IRegistrationContext $context): void {
+		$context->registerEventListener(BeforeMessageLoggedEvent::class, LogListener::class);
 	}
 
 	public function boot(IBootContext $context): void {

lib/Listener/LogListener.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2023 Robin Appelman <robin@icewind.nl>
+ *
+ * @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 OCA\LogReader\Listener;
+
+use OC\SystemConfig;
+use OCA\LogReader\Log\Console;
+use OCA\LogReader\Log\Formatter;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Log\BeforeMessageLoggedEvent;
+use Symfony\Component\Console\Terminal;
+
+class LogListener implements IEventListener {
+	private ?Console $console;
+
+	public function __construct(Formatter $formatter, SystemConfig $config) {
+		if (\OC_CONSOLE) {
+			$level = getenv('OCC_LOG');
+			if ($level) {
+				$terminal = new Terminal();
+				$this->console = new Console($formatter, $config, $level, $terminal->getWidth());
+			} else {
+				$this->console = null;
+			}
+		} else {
+			$this->console = null;
+		}
+	}
+
+
+	public function handle(Event $event): void {
+		if (!$event instanceof BeforeMessageLoggedEvent) {
+			return;
+		}
+
+		if ($this->console) {
+			$this->console->log($event->getLevel(), $event->getApp(), $event->getMessage());
+		}
+	}
+
+}

lib/Log/Console.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2023 Robin Appelman <robin@icewind.nl>
+ *
+ * @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 OCA\LogReader\Log;
+
+use OC\Log\LogDetails;
+use OC\SystemConfig;
+use OCA\LogReader\Command\Tail;
+
+/**
+ * Utility to write log messages to the console as they are emitted
+ */
+class Console extends LogDetails{
+	private int $level;
+	private int $terminalWidth;
+	private Formatter $formatter;
+
+	public function __construct(Formatter $formatter, SystemConfig $config, string $level, int $terminalWidth) {
+		parent::__construct($config);
+		$this->formatter = $formatter;
+		$this->level = self::parseLogLevel($level);
+		$this->terminalWidth = $terminalWidth;
+	}
+
+	public function log(int $level, string $app, $entry) {
+		if ($level >= $this->level) {
+			$messageWidth = $this->terminalWidth - 8 - 18 - 6;
+
+			$entry = $this->logDetails($app, $entry, $level);
+
+			$lines = explode("\n", $this->formatter->formatMessage($entry, $messageWidth));
+			$lines[0] = str_pad(Tail::LEVELS[$level], 8) . ' ' .
+				str_pad(wordwrap($app, 18), 18) . ' ' .
+				str_pad($lines[0], $messageWidth);
+
+			for ($i = 1; $i < count($lines); $i++) {
+				$lines[$i] = str_repeat(' ', 8 + 18 + 2) . $lines[$i];
+			}
+
+			foreach ($lines as $line) {
+				fwrite(STDERR,$line . "\n");
+			}
+			fwrite(STDERR,"\n");
+		}
+	}
+
+	private static function parseLogLevel(string $level): int {
+		if (is_numeric($level)) {
+			return (int)$level;
+		}
+
+		switch (strtoupper($level)) {
+			case "DEBUG":
+				return 0;
+			case "INFO":
+				return 1;
+			case "WARN":
+				return 2;
+			case "ERROR":
+				return 3;
+			case "FATAL":
+				return 4;
+			default:
+				throw new \Exception("Unknown log level $level");
+		}
+	}
+}