1 files changed, 89 insertions, 0 deletions
diff --git a/classes/Logger.php b/classes/Logger.php
new file mode 100644
index 000000000..ef6173a42
--- /dev/null
+++ b/classes/Logger.php
@@ -0,0 +1,89 @@
+<?php
+class Logger {
+	/** @var Logger|null */
+	private static $instance;
+
+	/** @var Logger_Adapter|null */
+	private $adapter;
+
+	const LOG_DEST_SQL = "sql";
+	const LOG_DEST_STDOUT = "stdout";
+	const LOG_DEST_SYSLOG = "syslog";
+
+	const ERROR_NAMES = [
+		1			=> 'E_ERROR',
+		2			=> 'E_WARNING',
+		4			=> 'E_PARSE',
+		8			=> 'E_NOTICE',
+		16			=> 'E_CORE_ERROR',
+		32			=> 'E_CORE_WARNING',
+		64			=> 'E_COMPILE_ERROR',
+		128		=> 'E_COMPILE_WARNING',
+		256		=> 'E_USER_ERROR',
+		512		=> 'E_USER_WARNING',
+		1024		=> 'E_USER_NOTICE',
+		2048		=> 'E_STRICT',
+		4096		=> 'E_RECOVERABLE_ERROR',
+		8192		=> 'E_DEPRECATED',
+		16384		=> 'E_USER_DEPRECATED',
+		32767		=> 'E_ALL'];
+
+	static function log_error(int $errno, string $errstr, string $file, int $line, string $context): bool {
+		return self::get_instance()->_log_error($errno, $errstr, $file, $line, $context);
+	}
+
+	private function _log_error(int $errno, string $errstr, string $file, int $line, string $context): bool {
+		//if ($errno == E_NOTICE) return false;
+
+		if ($this->adapter)
+			return $this->adapter->log_error($errno, $errstr, $file, $line, $context);
+		else
+			return false;
+	}
+
+	static function log(int $errno, string $errstr, string $context = ""): bool {
+		return self::get_instance()->_log($errno, $errstr, $context);
+	}
+
+	private function _log(int $errno, string $errstr, string $context = ""): bool {
+		if ($this->adapter)
+			return $this->adapter->log_error($errno, $errstr, '', 0, $context);
+		else
+			return user_error($errstr, $errno);
+	}
+
+	private function __clone() {
+		//
+	}
+
+	function __construct() {
+		switch (Config::get(Config::LOG_DESTINATION)) {
+		case self::LOG_DEST_SQL:
+			$this->adapter = new Logger_SQL();
+			break;
+		case self::LOG_DEST_SYSLOG:
+			$this->adapter = new Logger_Syslog();
+			break;
+		case self::LOG_DEST_STDOUT:
+			$this->adapter = new Logger_Stdout();
+			break;
+		default:
+			$this->adapter = null;
+		}
+
+		if ($this->adapter && !implements_interface($this->adapter, "Logger_Adapter"))
+			user_error("Adapter for LOG_DESTINATION: " . Config::LOG_DESTINATION . " does not implement required interface.", E_USER_ERROR);
+	}
+
+	private static function get_instance() : Logger {
+		if (self::$instance == null)
+			self::$instance = new self();
+
+		return self::$instance;
+	}
+
+	static function get() : Logger {
+		user_error("Please don't use Logger::get(), call Logger::log(...) instead.", E_USER_DEPRECATED);
+		return self::get_instance();
+	}
+}