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# 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 datetime
import math
import os.path
import sys
import tempfile
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):
"""Split a list.
Args:
seq: sequence
size: int
Returns:
New list.
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 FindDataFile(filename):
"""Find a datafile, searching various relative and OS paths."""
filename = os.path.expanduser(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(os.getcwd(), '..'),
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 directory in reversed(sys.path):
other_places.append(directory)
other_places.append(os.path.join(directory, 'namebench'))
for place in other_places:
path = os.path.join(place, filename)
if os.path.exists(path):
return path
print 'I could not find "%s". Tried:' % filename
for path in other_places:
print ' %s' % path
return filename
def GenerateOutputFilename(extension):
"""Generate a decent default output filename for a given extensio."""
# used for resolv.conf
if '.' in extension:
filename = extension
else:
output_base = 'namebench_%s' % datetime.datetime.strftime(datetime.datetime.now(),
'%Y-%m-%d %H%M')
output_base = output_base.replace(':', '').replace(' ', '_')
filename = '.'.join((output_base, extension))
output_dir = tempfile.gettempdir()
return os.path.join(output_dir, 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.', '')
error = '%s %s' % (exc_msg, error)
# We need to remove the trailing space at some point.
return error.rstrip()
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