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util.py

# Copyright 2009 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Little utility functions."""

__author__ = 'tstromberg@google.com (Thomas Stromberg)'

import math
import re
import util
import os.path
import sys
import traceback

# third party lib
import dns.resolver

import nameserver

def CalculateListAverage(values):
  """Computes the arithmetic mean of a list of numbers."""
  if not values:
    return 0
  return sum(values) / float(len(values))

def DrawTextBar(value, max_value, max_width=53):
  """Return a simple ASCII bar graph, making sure it fits within max_width.

  Args:
    value: integer or float representing the value of this bar.
    max_value: integer or float representing the largest bar.
    max_width: How many characters this graph can use (int)

  Returns:
    string
  """

  hash_width = max_value / max_width
  return int(math.ceil(value/hash_width)) * '#'


def SecondsToMilliseconds(seconds):
  return seconds * 1000

def SplitSequence(seq, size):
  """Recipe From http://code.activestate.com/recipes/425397/

  Modified to not return blank values."""
  newseq = []
  splitsize = 1.0/size*len(seq)
  for i in range(size):
    newseq.append(seq[int(round(i*splitsize)):int(round((i+1)*splitsize))])

  return  [ x for x in newseq if x ]


def InternalNameServers():
  """Return list of DNS server IP's used by the host."""
  try:
    return dns.resolver.Resolver().nameservers
  except:
    print "Unable to get list of internal DNS servers."
    return []

def ExtractIPsFromString(ip_string):
  """Return a tuple of ip addressed held in a string."""

  ips = []
  # IPV6 If this regexp is too loose, see Regexp-IPv6 in CPAN for inspiration.
  ips.extend(re.findall('[\dabcdef:]+:[\dabcdef:]+', ip_string, re.IGNORECASE))
  ips.extend(re.findall('\d+\.\d+\.\d+\.+\d+', ip_string))
  return ips

def ExtractIPTuplesFromString(ip_string):
  ip_tuples = []
  for ip in ExtractIPsFromString(ip_string):
      ip_tuples.append((ip,ip))
  return ip_tuples

def FindDataFile(filename):
  if os.path.exists(filename):
    return filename

  # If it's not a relative path, we can't do anything useful.
  if os.path.isabs(filename):
    return filename

  other_places = [os.getcwd(),
                  os.path.join(os.path.dirname(os.path.dirname(sys.argv[0])), 'Contents', 'Resources'),
                  os.path.join(os.getcwd(), 'namebench.app', 'Contents', 'Resources'),
                  os.path.join(sys.prefix, 'namebench'),
                  '/usr/local/share/namebench'
                  '/usr/local/etc/namebench',
                  '/usr/local/namebench',
                  '/etc/namebench',
                  '/usr/share/namebench',
                  '/usr/namebench']
  for dir in reversed(sys.path):
    other_places.append(dir)
    other_places.append(os.path.join(dir, 'namebench'))

  for place in other_places:
    path = os.path.join(place, filename)
    if os.path.exists(path):
      return path

  print "I could not find your beloved '%s'. Tried:" % filename
  for path in other_places:
    print "  %s" % path
  return filename

def GetLastExceptionString():
  """Get the last exception and return a good looking string for it."""
  (exc, error) = sys.exc_info()[0:2]
  exc_msg = str(exc)
  if '<class' in exc_msg:
    exc_msg = exc_msg.split("'")[1]

  exc_msg = exc_msg.replace('dns.exception.', '')
  return '%s %s' % (exc_msg, error)

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