Andrew's git - logparse.git/blob

   1#
   2#   utilities.py
   3#
   4#   Commonly used general functions
   5#
   6
   7import re
   8import os
   9import socket
  10import inspect
  11
  12import logging
  13logger = logging.getLogger(__name__)
  14
  15from pkg_resources import Requirement, resource_filename
  16
  17from . import config
  18
  19def hostname(path): # get the hostname of current server
  20    hnfile = open(path, 'r')
  21    hn = re.search('^(\w*)\n*', hnfile.read()).group(1)
  22    return hn
  23
  24def getlocaldomain(): # get the parent fqdn of current server
  25    domain = socket.getfqdn().split('.', 1) # Note: if socket.fetfqdn() returns localhost, make sure the first entry in /etc/hosts contains the fqdn
  26    if len(domain) != 2:
  27        logger.warning('Could not get domain of this server, only hostname. Please consider updating /etc/hosts')
  28        return 'localdomain'
  29    else:
  30        return domain[-1]
  31
  32def resolve(ip, fqdn = 'host-only'):        # try to resolve an ip to hostname
  33    # Possible values for fqdn:
  34    #   fqdn            show full hostname and domain
  35    #   fqdn-implicit   show hostname and domain unless local
  36    #   host-only       only show hostname
  37    #   ip              never resolve anything
  38    # resolve-domains defined in individual sections of the config take priority over global config
  39    
  40    if not fqdn:
  41        fqdn = config.prefs['resolve-domains']
  42
  43    if fqdn == 'ip':
  44        return(ip)
  45
  46    try:
  47        socket.inet_aton(ip)  # succeeds if text contains ip
  48        hn = socket.gethostbyaddr(ip)[0] # resolve ip to hostname
  49        if fqdn == 'fqdn-implicit' and hn.split('.', 1)[1] == getlocaldomain():
  50            return(hn.split('.')[0])
  51        elif fqdn == 'fqdn' or fqdn == 'fqdn-implicit':
  52            return(hn)
  53        elif fqdn == 'host-only':
  54            return(hn.split('.')[0])
  55        else:
  56            logger.warning("invalid value for fqdn config")
  57            return(hn)
  58    except socket.herror:
  59        # cannot resolve ip
  60        logger.debug(ip + " cannot be found, might not exist anymore")
  61        return(ip)
  62    except (OSError, socket.error): # socket.error for Python 2 compatibility
  63        # already a hostname
  64        logger.debug(ip + " is already a hostname")
  65        return(ip)
  66    except Exception as err:
  67        logger.warning("failed to resolve hostname for " + ip + ": " + str(err))
  68        return(ip)  # return ip if no hostname exists
  69
  70def readlog(path = None, mode = 'r'):   # read file
  71    if (path == None):
  72        logger.error("no path provided")
  73        return
  74    else:
  75        if (os.path.isfile(path) is False):
  76            logger.error("Log at {0} was requested but does not exist".format(path))
  77            return ''
  78        else:
  79            try:
  80                return open(path, mode).read()
  81            except IOError or OSError as e:
  82                logger.warning("Error reading log at {0}: {1}".format(path, e.strerror))
  83                return 1