1 class SyslogRule (SyslogFilter) :

     2     """

     3         A rule matches syslog lines, and formats them.

     4             

     5             tag         - apply given tag to matches

     6     """

     7         

     8     def __init__ (self, tag, program=None, pattern=None, format=None, flags=None, **opts) :

     9         if pattern and not isinstance(pattern, re.RegexObject) :

    10             pattern = re.compile(pattern, flags)

    11 

    12         super(SyslogRule, self).__init__(prog=program)

    13 

    14         self.tag = tag

    15         self.format = format

    16         self.pattern = pattern

    17 

    18     def apply (self, item) :

    19         """

    20             Apply rule against given item.

    21         """

    22         

    23         # filter

    24         match = self.filter(item)

    25 

    26         if not match :

    27             # ignore

    28             return None

    29         

    30         match = self.pattern.match(item['msg'])

    31 

    32         if not match :

    33             # ignore

    34             return None

    35         

    36         # apply

    37         item.update(match.groupdict())

    38 

    39         if self.tag is False :

    40             # drop

    41             return False

    42             

    43         if self.format :

    44             # return

    45             return self.tag, self.format.format(**item)

    46