Adding upstream version 2.2.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

staslib/log.py

@@ -0,0 +1,53 @@
+# Copyright (c) 2022, Dell Inc. or its subsidiaries.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+# See the LICENSE file for details.
+#
+# This file is part of NVMe STorage Appliance Services (nvme-stas).
+#
+# Authors: Martin Belanger <Martin.Belanger@dell.com>
+#
+'''nvme-stas logging module'''
+
+import sys
+import logging
+from staslib import defs
+
+
+def init(syslog: bool):
+    '''Init log module
+    @param syslog: True to send messages to the syslog,
+                   False to send messages to stdout.
+    '''
+    log = logging.getLogger()
+    log.propagate = False
+
+    if syslog:
+        try:
+            # Try journal logger first
+            import systemd.journal  # pylint: disable=import-outside-toplevel
+
+            handler = systemd.journal.JournalHandler(SYSLOG_IDENTIFIER=defs.PROG_NAME)
+        except ModuleNotFoundError:
+            # Go back to standard syslog handler
+            from logging.handlers import SysLogHandler  # pylint: disable=import-outside-toplevel
+
+            handler = SysLogHandler(address="/dev/log")
+            handler.setFormatter(logging.Formatter(f'{defs.PROG_NAME}: %(message)s'))
+    else:
+        # Log to stdout
+        handler = logging.StreamHandler(stream=sys.stdout)
+
+    log.addHandler(handler)
+    log.setLevel(logging.INFO if syslog else logging.DEBUG)
+
+
+def level() -> str:
+    '''@brief return current log level'''
+    logger = logging.getLogger()
+    return str(logging.getLevelName(logger.getEffectiveLevel()))
+
+
+def set_level_from_tron(tron):
+    '''Set log level based on TRON'''
+    logger = logging.getLogger()
+    logger.setLevel(logging.DEBUG if tron else logging.INFO)