1 files changed, 91 insertions, 0 deletions
diff --git a/classes/Debug.php b/classes/Debug.php
new file mode 100644
index 0000000..79116cd
--- /dev/null
+++ b/classes/Debug.php
@@ -0,0 +1,91 @@
+<?php
+class Debug {
+	const LOG_DISABLED = -1;
+    const LOG_NORMAL = 0;
+    const LOG_VERBOSE = 1;
+    const LOG_EXTENDED = 2;
+
+	public static int $LOG_DISABLED = -1;
+    public static int $LOG_NORMAL = 0;
+    public static int $LOG_VERBOSE = 1;
+    public static int $LOG_EXTENDED = 2;
+
+    private static bool $enabled = false;
+    private static bool $quiet = false;
+    private static string $logfile = "";
+    private static int $loglevel = 0;
+
+	public static function set_logfile(string $logfile) : void {
+        self::$logfile = $logfile;
+    }
+
+    public static function enabled() : bool {
+        return self::$enabled;
+    }
+
+    public static function set_enabled(bool $enable) : void {
+        self::$enabled = $enable;
+    }
+
+    public static function set_quiet(bool $quiet) : void {
+        self::$quiet = $quiet;
+    }
+
+    public static function set_loglevel(int $level) : void {
+        self::$loglevel = $level;
+    }
+
+    public static function get_loglevel() : int {
+        return self::$loglevel;
+    }
+
+    public static function log(string $message, int $level = 0) : void {
+
+        if (!self::$enabled || self::$loglevel < $level) return;
+
+        $ts = strftime("%H:%M:%S", time());
+        if (function_exists('posix_getpid')) {
+            $ts = "$ts/" . posix_getpid();
+        }
+
+        if (self::$logfile) {
+            $fp = fopen(self::$logfile, 'a+');
+
+            if ($fp) {
+                $locked = false;
+
+                if (function_exists("flock")) {
+                    $tries = 0;
+
+                    // try to lock logfile for writing
+                    while ($tries < 5 && !$locked = flock($fp, LOCK_EX | LOCK_NB)) {
+                        sleep(1);
+                        ++$tries;
+                    }
+
+                    if (!$locked) {
+                        fclose($fp);
+                        user_error("Unable to lock debugging log file: " . self::$logfile, E_USER_WARNING);
+                        return;
+                    }
+                }
+
+                fputs($fp, "[$ts] $message\n");
+
+                if (function_exists("flock")) {
+                    flock($fp, LOCK_UN);
+                }
+
+                fclose($fp);
+
+                if (self::$quiet)
+                    return;
+
+            } else {
+                user_error("Unable to open debugging log file: " . self::$logfile, E_USER_WARNING);
+            }
+        }
+
+        print "[$ts] $message\n";
+    }
+}