packstack/packstack/installer/core/sequences.py
Christian Berendt d7916cec60 Enable PEP8 checks H102, H232, H233, H301, H904
* H102  Apache 2.0 license header not found
* H232  Python 3.x incompatible octal xxx should be written as 0oxxx
* H233  Python 3.x incompatible use of print operator
* H301  one import per line
* H904  Wrap long lines in parentheses instead of a backslash

Change-Id: I07003acb76eaa719daabc451239067494efa2bba
2015-02-02 10:45:44 +01:00

110 lines
3.6 KiB
Python

# -*- coding: utf-8 -*-
# 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.
"""
Base class for steps & sequences
"""
import sys
import logging
import traceback
from .. import utils
from ..exceptions import SequenceError
class Step(object):
"""
Wrapper for function representing single setup step.
"""
def __init__(self, name, function, title=None):
self.name = name
self.title = title or ('Step: %s' % name)
# process step function
if function and not callable(function):
raise SequenceError("Function object have to be callable. "
"Object %s is not callable." % function)
self.function = function
def run(self, config=None, messages=None):
config = config if config is not None else {}
messages = messages if messages is not None else []
# TO-DO: complete logger name when logging will be setup correctly
logger = logging.getLogger()
logger.debug('Running step %s.' % self.name)
# execute and report state
try:
self.function(config, messages)
except Exception as ex:
logger.debug(traceback.format_exc())
state = utils.state_message(self.title, 'ERROR', 'red')
sys.stdout.write('%s\n' % state)
sys.stdout.flush()
raise
else:
state = utils.state_message(self.title, 'DONE', 'green')
sys.stdout.write('%s\n' % state)
sys.stdout.flush()
class Sequence(object):
"""
Wrapper for sequence of setup steps.
"""
def __init__(self, name, steps, title=None, condition=None,
cond_match=None):
self.name = name
self.title = title
self.condition = condition
self.cond_match = cond_match
# process sequence steps
self.steps = utils.SortedDict()
for step in steps:
name, func = step['name'], step['function']
self.steps[name] = Step(name, func, title=step.get('title'))
def validate_condition(self, config):
"""
Returns True if config option condition has value given
in cond_match. Otherwise returns False.
"""
if not self.condition:
return True
result = config.get(self.condition)
return result == self.cond_match
def run(self, config=None, messages=None, step=None):
"""
Runs sequence of steps. Runs only specific step if step's name
is given via 'step' parameter.
"""
config = config if config is not None else {}
messages = messages if messages is not None else []
if not self.validate_condition(config):
return
if step:
self.steps[step].run(config=config, messages=messages)
return
logger = logging.getLogger()
logger.debug('Running sequence %s.' % self.name)
if self.title:
sys.stdout.write('%s\n' % self.title)
sys.stdout.flush()
for step in self.steps.itervalues():
step.run(config=config, messages=messages)