Use systemd.journal to log to journald when sarted via .service files.

This enables proper filtering by level etc. (incl. journald coloring).

1 files changed, 16 insertions, 0 deletions

diff --git a/common.py b/common.py
index 3eb8a3e..88a0f4d 100644
--- a/common.py
+++ b/common.py
@@ -27,6 +27,22 @@ from xdg.BaseDirectory import xdg_config_home
 import logging
 import yaml
 
+def init_logger(app=__file__, level=logging.WARNING):
+    log_fmt = logging.Formatter('%(levelname)s: %(message)s')
+    log = logging.getLogger()
+    log.setLevel(level)
+
+    if os.getenv('SYSTEMD_EXEC_PID', None) is None:
+        ch = logging.StreamHandler()
+    else:
+        # started in systemd, use journald for filtering incl. coloring
+        from systemd.journal import JournalHandler
+        ch = JournalHandler(SYSLOG_IDENTIFIER=app)
+
+    ch.setFormatter(log_fmt)
+    log.addHandler(ch)
+    return log
+
 def load_config(path=None, groupnames=None):
     if path is None:
         for p in [Path(),