mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-09-08 22:14:09 +00:00
65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
from subprocess import Popen, run
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from functools import partial
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from contextlib import suppress
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import yaml
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from transitions import State
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from tfw import FSMBase
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class YamlFSM(FSMBase):
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def __init__(self, config_file):
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self.config = self.parse_config(config_file)
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self.setup_states()
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super().__init__() # FSMBase.__init__() requires states
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self.setup_transitions()
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@staticmethod
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def parse_config(config_file):
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with open(config_file, 'r') as ifile:
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return yaml.safe_load(ifile)
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def setup_states(self):
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self.for_config_states_and_transitions_do(self.patch_config_callbacks)
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self.states = [State(**state) for state in self.config['states']]
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def setup_transitions(self):
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self.for_config_states_and_transitions_do(self.subscribe_and_remove_predicates)
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for transition in self.config['transitions']:
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self.add_transition(**transition)
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def for_config_states_and_transitions_do(self, what):
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for array in ('states', 'transitions'):
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for json_obj in self.config[array]:
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what(json_obj)
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@staticmethod
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def patch_config_callbacks(json_obj):
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topatch = ('on_enter', 'on_exit', 'prepare', 'before', 'after')
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for key in json_obj:
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if key in topatch:
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json_obj[key] = partial(run_command_async, json_obj[key])
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def subscribe_and_remove_predicates(self, json_obj):
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if 'predicates' in json_obj:
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for predicate in json_obj['predicates']:
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self.subscribe_predicate(
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json_obj['trigger'],
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partial(
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command_statuscode_is_zero,
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predicate
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)
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)
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with suppress(KeyError):
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json_obj.pop('predicates')
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def run_command_async(command, event):
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Popen(command, shell=True)
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def command_statuscode_is_zero(command):
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return run(command, shell=True).returncode == 0
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