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# Copyright 2017 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import cliapp
class StepRunnerInterface(object): # pragma: no cover
def get_required_keys(self):
raise NotImplementedError()
def run(self, step_spec, settings, state):
raise NotImplementedError()
def run_even_if_skipped(self, step_spec, settings, state):
pass
def teardown(self, step_spec, settings, state):
# Default implementation does nop, so that sub-classes don't
# need to have a nop teardown.
pass
def skip(self, step_spec, settings, state):
# Return true if step should be skipped and not run. Does not
# apply to teardowns.
# Skipping is indicated by the step having a field 'unless',
# which is either the name of a variable (field in state), or
# a list of such names. If all variables have a value that
# evaluates as truth, the step is skipped.
value = step_spec.get('unless', None)
if value is None:
return False
if isinstance(value, list):
return all(getattr(state, field, False) for field in value)
return getattr(state, value, False)
class StepRunnerList(object):
def __init__(self):
self._runners = []
def __len__(self):
return len(self._runners)
def add(self, runner):
self._runners.append(runner)
def find(self, step_spec):
actual = set(step_spec.keys())
for runner in self._runners:
required = set(runner.get_required_keys())
if actual.intersection(required) == required:
return runner
raise NoMatchingRunner(actual)
class StepError(cliapp.AppException):
pass
class NoMatchingRunner(cliapp.AppException):
def __init__(self, keys):
super(NoMatchingRunner, self).__init__(
'No runner implements step with keys {}'.format(
', '.join(keys)))
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