Prefix messages with a timestamp and support multiple verbosity levels

README.md

@@ -50,6 +50,8 @@ In addition some checks have specific options, see lib/checks.py for examples.
 In case you want to check lesser important services and configure very long check intervals, you may
 want to have another interval, global to all checks, for error retries. This can be set with the `error_every` option.
 
+For a full list of all available options, see the lib/__init__.py file.
+
 Current state output
 --------------------
 

lib/__init__.py

@@ -15,6 +15,9 @@ config.install_attr('base_tick', 60)
 # How often we retry checks that are in error (-1 disables feature)
 config.install_attr('error_every', -1)
 
+# Verbosity level (one of CRITICAL, ERROR, WARNING, INFO, DEBUG)
+config.install_attr('verb_level', 'INFO')
+
 # Email addresses to send to when an alert is triggered
 config.install_attr('emails.to', [])
 # The From: address

lib/checks.py

 from .subprocess_compat import TimeoutExpired, Popen, PIPE
 import re
+import logging
 from . import mails
 from collections import Iterable
 from datetime import datetime
@@ -61,6 +62,7 @@ class Check(object):
                                           config.error_every < 0
                                        else config.error_every)
         if self.every_count == 0 or immediate:
+            logging.debug('Running ' + str(self))
             self.setup()
             if not self.check():
                 self.retry_count = min(self.retry_count + 1, self.retry)

lib/mails.py

 import smtplib
+import logging
 from email.mime.text import MIMEText
 from email.utils import make_msgid
 from collections import defaultdict
@@ -55,7 +56,7 @@ class ThreadedSMTP(object):
                             server = smtplib.SMTP(host)
                         server.sendmail(*args, **kwargs)
                     except Exception as e:
-                        print("Couldn't send email: %s" % str(e), file=stderr)
+                        logging.warning("Couldn't send email: %s" % str(e))
             finally:
                 if server:  # server is None on exception queue.Empty
                     self._queue.task_done()

picomon.py

 import concurrent.futures
 import signal
 import argparse
+import logging
 from time import sleep
 import config as user_config
 from lib import config
@@ -60,8 +61,17 @@ if __name__ == '__main__':
                         help="single run with immediate output of " +
                              "check results (test/debug)",
                         action="store_true")
+    parser.add_argument("-D", "--debug",
+                        help="Set verbosity to DEBUG",
+                        action="store_true")
     args = parser.parse_args()
 
+    # Configure logging
+    logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s',
+                        level=config.verb_level)
+    if args.debug:
+        logging.getLogger().setLevel('DEBUG')
+
     # do the actual polling
     with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor:
         def runner(check):