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# Copyright 2012 OpenStack Foundation
# 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.
import inspect
import re
from oslo_log import log as logging
LOG = logging.getLogger(__name__)
def singleton(cls):
"""Simple wrapper for classes that should only have a single instance."""
instances = {}
def getinstance():
if cls not in instances:
instances[cls] = cls()
return instances[cls]
return getinstance
def find_test_caller():
"""Find the caller class and test name.
Because we know that the interesting things that call us are
test_* methods, and various kinds of setUp / tearDown, we
can look through the call stack to find appropriate methods,
and the class we were in when those were called.
"""
caller_name = None
names = []
frame = inspect.currentframe()
is_cleanup = False
# Start climbing the ladder until we hit a good method
while True:
try:
frame = frame.f_back
name = frame.f_code.co_name
names.append(name)
if re.search("^(test_|setUp|tearDown)", name):
cname = ""
if 'self' in frame.f_locals:
cname = frame.f_locals['self'].__class__.__name__
if 'cls' in frame.f_locals:
cname = frame.f_locals['cls'].__name__
caller_name = cname + ":" + name
break
elif re.search("^_run_cleanup", name):
is_cleanup = True
elif name == 'main':
caller_name = 'main'
break
else:
cname = ""
if 'self' in frame.f_locals:
cname = frame.f_locals['self'].__class__.__name__
if 'cls' in frame.f_locals:
cname = frame.f_locals['cls'].__name__
# the fact that we are running cleanups is indicated pretty
# deep in the stack, so if we see that we want to just
# start looking for a real class name, and declare victory
# once we do.
if is_cleanup and cname:
if not re.search("^RunTest", cname):
caller_name = cname + ":_run_cleanups"
break
except Exception:
break
# prevents frame leaks
del frame
if caller_name is None:
LOG.debug("Sane call name not found in %s" % names)
return caller_name
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