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"""Helper functions for working with names for volumes, resources, etc.
"""
import string
import random
import re
# we only use lowercase here because kubernetes requires
# names to be lowercase or digits, so that is our default
try:
# py2
UNIQUE_CHARS = (string.lowercase + string.digits)
except AttributeError:
# py3
UNIQUE_CHARS = (string.ascii_lowercase + string.digits)
def make_unique_label(prefix=None, suffix=None, sep='-',
clean=r'[^a-zA-Z0-9]+', unique_len=8,
unique_chars=UNIQUE_CHARS):
"""Generate a unique name string based on an optional prefix,
suffix, and pseudo-random set of alphanumeric characters.
Args:
prefix (str): Start of the unique string.
suffix (str): End of the unique string.
sep (str): Separator string (between sections/invalid chars).
clean (str): Reqular expression matching invalid chars.
that will be replaced by `sep` if found in the prefix or suffix
unique_len (int): Length of the unique part.
unique_chars (str): String representing the set of characters
the unique part will draw from.
Returns:
str: The uniqueish string.
"""
cre = re.compile(clean)
parts = []
if prefix:
parts.append(cre.sub(sep, prefix))
parts.append(''.join(random.choice(unique_chars)
for _ in range(unique_len)))
if suffix:
parts.append(cre.sub(sep, suffix))
return sep.join(parts)
def extract_method_name(full_name, keep_class=False):
"""Given a full test name as returned from TestCase.id() return
just the method part or class.method.
Args:
full_name (str): Dot separated name of test.
keep_class (str): Retain the class name, if false only the
method name will be returned.
Returns:
str: Method name or class.method_name.
"""
offset = -1
if keep_class:
offset = -2
return '.'.join(full_name.split('.')[offset:])
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