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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2011 Citrix Systems, Inc.
#
# 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.
"""This modules stubs out functions in openstack.common.processutils."""
import re
from eventlet import greenthread
from nova.openstack.common import log as logging
from nova.openstack.common import processutils
LOG = logging.getLogger(__name__)
_fake_execute_repliers = []
_fake_execute_log = []
def fake_execute_get_log():
return _fake_execute_log
def fake_execute_clear_log():
global _fake_execute_log
_fake_execute_log = []
def fake_execute_set_repliers(repliers):
"""Allows the client to configure replies to commands."""
global _fake_execute_repliers
_fake_execute_repliers = repliers
def fake_execute_default_reply_handler(*ignore_args, **ignore_kwargs):
"""A reply handler for commands that haven't been added to the reply list.
Returns empty strings for stdout and stderr.
"""
return '', ''
def fake_execute(*cmd_parts, **kwargs):
"""This function stubs out execute.
It optionally executes a preconfigued function to return expected data.
"""
global _fake_execute_repliers
process_input = kwargs.get('process_input', None)
check_exit_code = kwargs.get('check_exit_code', 0)
delay_on_retry = kwargs.get('delay_on_retry', True)
attempts = kwargs.get('attempts', 1)
run_as_root = kwargs.get('run_as_root', False)
cmd_str = ' '.join(str(part) for part in cmd_parts)
LOG.debug(_("Faking execution of cmd (subprocess): %s"), cmd_str)
_fake_execute_log.append(cmd_str)
reply_handler = fake_execute_default_reply_handler
for fake_replier in _fake_execute_repliers:
if re.match(fake_replier[0], cmd_str):
reply_handler = fake_replier[1]
LOG.debug(_('Faked command matched %s') % fake_replier[0])
break
if isinstance(reply_handler, basestring):
# If the reply handler is a string, return it as stdout
reply = reply_handler, ''
else:
try:
# Alternative is a function, so call it
reply = reply_handler(cmd_parts,
process_input=process_input,
delay_on_retry=delay_on_retry,
attempts=attempts,
run_as_root=run_as_root,
check_exit_code=check_exit_code)
except processutils.ProcessExecutionError as e:
LOG.debug(_('Faked command raised an exception %s'), e)
raise
stdout = reply[0]
stderr = reply[1]
LOG.debug(_("Reply to faked command is stdout='%(stdout)s' "
"stderr='%(stderr)s'") % locals())
# Replicate the sleep call in the real function
greenthread.sleep(0)
return reply
def stub_out_processutils_execute(stubs):
fake_execute_set_repliers([])
fake_execute_clear_log()
stubs.Set(processutils, 'execute', fake_execute)
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