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from typing import Dict
from pyparsing import alphanums, alphas, printables, pyparsing_common, pyparsing_common, Word, infix_notation, CaselessKeyword, opAssoc, ParserElement
import logging
import time
import endpoint
import misc
'''
Implementations of Trigger:
MUST implement:
_evaluate(self, action: str) -> bool
evaluates the instace for action given by 'action'.
Provided configuration is stored in self._instances[action]['args']
CAN implement:
_addInstance(self, action: str)
Called afer 'action' was added.
SHOULDNT implement:
evaluate(self, action: str) -> bool
Only calls _evaluate(), if no check was performed in configured interval,
otherwise returns cached result
addInstance(self, action:str, interval=30, **kwargs)
'''
class Trigger:
NEEDS_CONTEXT = False
@staticmethod
def create(classname: str, **kwargs):
return misc.import_class(classname)(**kwargs)
def __init__(self):
self._instances = {}
def _addInstance(self, action: str):
pass
def addInstance(self, action: str, interval: int=30, **kwargs):
self._instances[action] = {'lastupdate':0,'interval':interval,'last':False,'args':kwargs}
self._addInstance(action)
logging.debug(f'Trigger: Action "{action}" registered.')
def _evaluate(self, action: str) -> bool:
raise NotImplemented
def _shouldReevaluate(self, action: str) -> bool:
return time.time() - self._instances[action]['lastupdate'] > self._instances[action]['interval']
def evaluate(self, action: str) -> bool:
if action not in self._instances:
logging.error(f'Trigger: Action "{action}" was not found. Evaluating to False.')
return False
if self._shouldReevaluate(action):
logging.debug(f'Re-evaluating trigger condition for action "{action}"')
result = self._evaluate(action)
self._instances[action]['last'] = result
self._instances[action]['lastupdate'] = time.time()
return result
return self._instances[action]['last']
'''
```yaml
conditional:
class: trigger.Conditional
---
- conditional:
interval: 30
when:
- host1.user.bob > 0
```
'''
class ConditionalTrigger(Trigger):
NEEDS_CONTEXT = True
def __init__(self, endpoints: Dict[str, endpoint.Endpoint]):
super().__init__()
self._endpoints = endpoints
self._setup_parser()
def _setup_parser(self):
ParserElement.enable_packrat()
boolean = CaselessKeyword('True').setParseAction(lambda x: True) | CaselessKeyword('False').setParseAction(lambda x: False)
integer = pyparsing_common.integer
variable = Word(alphanums + '.').setParseAction(self._parseVariable)
operand = boolean | integer | variable
self._parser = infix_notation(
operand,
[
('not', 1, opAssoc.RIGHT, lambda a: not a[0][1]),
('and', 2, opAssoc.LEFT, lambda a: a[0][0] and a[0][2]),
('or', 2, opAssoc.LEFT, lambda a: a[0][0] or a[0][2]),
('==', 2, opAssoc.LEFT, lambda a: a[0][0] == a[0][2]),
('>', 2, opAssoc.LEFT, lambda a: a[0][0] > a[0][2]),
('>=', 2, opAssoc.LEFT, lambda a: a[0][0] >= a[0][2]),
('<', 2, opAssoc.LEFT, lambda a: a[0][0] < a[0][2]),
('<=', 2, opAssoc.LEFT, lambda a: a[0][0] <= a[0][2]),
('+', 2, opAssoc.LEFT, lambda a: a[0][0] + a[0][2]),
('-', 2, opAssoc.LEFT, lambda a: a[0][0] - a[0][2]),
('*', 2, opAssoc.LEFT, lambda a: a[0][0] * a[0][2]),
('/', 2, opAssoc.LEFT, lambda a: a[0][0] / a[0][2]),
]
)
def _parseVariable(self, var):
logging.debug(f'Looking up variable "{var[0]}"')
endpoint, key = var[0].split('.',1)
if not endpoint in self._endpoints:
logging.error(f'Parser: Endpoint "{endpoint}" not found')
return None
return self._endpoints[endpoint].getState(key)
def _evaluate(self, action: str) -> bool:
return all(self._parser.parse_string(str(s)) for s in self._instances[action]['args']['when'])
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