168 lines
5.2 KiB
Python
168 lines
5.2 KiB
Python
import json
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import logging
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import re
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from platypush.config import Config
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from platypush.message.event import Event, EventMatchResult
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from platypush.message.request import Request
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from platypush.utils import get_event_class_by_type
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def parse(msg):
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""" Builds a dict given another dictionary or
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a JSON UTF-8 encoded string/bytearray """
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if isinstance(msg, bytes) or isinstance(msg, bytearray):
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msg = msg.decode('utf-8')
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if isinstance(msg, str):
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try:
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msg = json.loads(msg.strip())
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except:
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logging.warning('Invalid JSON message: {}'.format(msg))
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return None
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return msg
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class EventCondition(object):
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""" Event hook condition class """
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def __init__(self, type=Event.__class__, **kwargs):
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"""
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Rule constructor.
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Params:
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type -- Class of the event to be built
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kwargs -- Fields rules as a key-value (e.g. source_button=btn_id
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or recognized_phrase='Your phrase')
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"""
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self.type = type
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self.args = {}
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self.parsed_args = {}
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for (key, value) in kwargs.items():
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# TODO So far we only allow simple value match. If value is a dict
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# instead, we should allow more a sophisticated attribute matching,
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# e.g. or conditions, in, and other operators.
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self.args[key] = value
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@classmethod
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def build(cls, rule):
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""" Builds a rule given either another EventRule, a dictionary or
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a JSON UTF-8 encoded string/bytearray """
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if isinstance(rule, cls): return rule
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else: rule = parse(rule)
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assert isinstance(rule, dict)
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type = get_event_class_by_type(
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rule.pop('type') if 'type' in rule else 'Event')
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args = {}
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for (key, value) in rule.items():
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args[key] = value
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return cls(type=type, **args)
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class EventAction(Request):
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""" Event hook action class. It is a special type of runnable request
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whose fields can be configured later depending on the event context """
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def __init__(self, target=None, action=None, **args):
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if target is None: target=Config.get('device_id')
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super().__init__(target=target, action=action, **args)
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def execute(self, **context):
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event_args = context.pop('event').args if 'event' in context else {}
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for (argname, value) in self.args.items():
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if isinstance(value, str):
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parsed_value = ''
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while value:
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m = re.match('([^\\\]*)\$([\w\d_-]+)(.*)', value)
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if m:
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context_argname = m.group(2)
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value = m.group(3)
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if context_argname in context:
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parsed_value += m.group(1) + context[context_argname]
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else:
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parsed_value += m.group(1) + '$' + m.group(2)
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else:
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parsed_value += value
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value = ''
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value = parsed_value
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self.args[argname] = value
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super().execute()
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@classmethod
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def build(cls, action):
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action = super().parse(action)
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action['origin'] = Config.get('device_id')
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if 'target' not in action:
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action['target'] = action['origin']
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return super().build(action)
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class EventHook(object):
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""" Event hook class. It consists of one conditionss and
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one or multiple actions to be executed """
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def __init__(self, name, condition=None, actions=[]):
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""" Construtor. Takes a name, a EventCondition object and a list of
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EventAction objects as input """
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self.name = name
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self.condition = EventCondition.build(condition or {})
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self.actions = actions
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@classmethod
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def build(cls, name, hook):
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""" Builds a rule given either another EventRule, a dictionary or
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a JSON UTF-8 encoded string/bytearray """
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if isinstance(hook, cls): return hook
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else: hook = parse(hook)
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assert isinstance(hook, dict)
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condition = EventCondition.build(hook['if']) if 'if' in hook else None
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actions = []
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if 'then' in hook:
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if isinstance(hook['then'], list):
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actions = [EventAction.build(action) for action in hook['then']]
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else:
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actions = [EventAction.build(hook['then'])]
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return cls(name=name, condition=condition, actions=actions)
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def matches_event(self, event):
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""" Returns an EventMatchResult object containing the information
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about the match between the event and this hook """
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return event.matches_condition(self.condition)
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def run(self, event):
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""" Checks the condition of the hook against a particular event and
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runs the hook actions if the condition is met """
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result = self.matches_event(event)
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if result.is_match:
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logging.info('Running hook {} triggered by an event'.format(self.name))
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for action in self.actions:
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action.execute(event=event, **result.parsed_args)
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# vim:sw=4:ts=4:et:
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