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from __future__ import absolute_import |
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import inspect |
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from itertools import chain |
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from fields import Fields |
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from six import string_types |
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from .actions import Action |
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from .event import Event |
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class Query(Fields.query): |
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""" |
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A query class. |
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See :class:`hunter.Event` for fields that can be filtered on. |
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""" |
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query = () |
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allowed = tuple(i for i in Event.__dict__.keys() if not i.startswith('_')) |
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def __init__(self, **query): |
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""" |
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Args: |
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query: criteria to match on. |
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Accepted arguments: ``arg``, ``code``, ``filename``, ``frame``, ``fullsource``, ``function``, |
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``globals``, ``kind``, ``lineno``, ``locals``, ``module``, ``source``, ``stdlib``, ``tracer``. |
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""" |
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for key in query: |
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if key not in self.allowed: |
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raise TypeError("Unexpected argument {!r}. Must be one of {}.".format(key, self.allowed)) |
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self.query = query |
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def __repr__(self): |
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return "Query({})".format( |
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', '.join("{}={!r}".format(*item) for item in self.query.items()), |
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) |
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def __call__(self, event): |
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""" |
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Handles event. Returns True if all criteria matched. |
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""" |
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for key, value in self.query.items(): |
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evalue = event[key] |
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if isinstance(evalue, string_types) and isinstance(value, (list, tuple, set)): |
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if not evalue.startswith(tuple(value)): |
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return False |
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elif evalue != value: |
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return False |
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return True |
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def __or__(self, other): |
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""" |
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Convenience API so you can do ``Q() | Q()``. It converts that to ``Or(Q(), Q())``. |
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""" |
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return Or(self, other) |
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def __and__(self, other): |
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""" |
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Convenience API so you can do ``Q() & Q()``. It converts that to ``And(Q(), Q())``. |
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""" |
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return And(self, other) |
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class When(Fields.condition.actions): |
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""" |
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Runs ``actions`` when ``condition(event)`` is ``True``. |
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Actions take a single ``event`` argument. |
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""" |
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def __init__(self, condition, *actions): |
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if not actions: |
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raise TypeError("Must give at least one action.") |
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super(When, self).__init__(condition, [ |
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action() if inspect.isclass(action) and issubclass(action, Action) else action |
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for action in actions |
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]) |
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def __call__(self, event): |
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""" |
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Handles the event. |
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""" |
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if self.condition(event): |
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for action in self.actions: |
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action(event) |
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return True |
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def __or__(self, other): |
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return Or(self, other) |
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def __and__(self, other): |
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return And(self, other) |
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def _with_metaclass(meta, *bases): |
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"""Create a base class with a metaclass.""" |
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# This requires a bit of explanation: the basic idea is to make a dummy |
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# metaclass for one level of class instantiation that replaces itself with |
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# the actual metaclass. |
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class metaclass(meta): |
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def __new__(cls, name, this_bases, d): |
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return meta(name, bases, d) |
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return type.__new__(metaclass, 'temporary_class', (), {}) |
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class And(Fields.predicates): |
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""" |
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`And` predicate. Exits at the first sub-predicate that returns ``False``. |
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""" |
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def __init__(self, *predicates): |
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self.predicates = predicates |
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def __str__(self): |
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return "And({})".format(', '.join(str(p) for p in self.predicates)) |
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def __call__(self, event): |
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""" |
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Handles the event. |
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""" |
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for predicate in self.predicates: |
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if not predicate(event): |
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return False |
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return True |
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def __or__(self, other): |
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return Or(self, other) |
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def __and__(self, other): |
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return And(*chain(self.predicates, other.predicates if isinstance(other, And) else (other,))) |
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class Or(Fields.predicates): |
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""" |
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`Or` predicate. Exits at first sub-predicate that returns ``True``. |
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""" |
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def __init__(self, *predicates): |
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self.predicates = predicates |
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def __str__(self): |
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return "Or({})".format(', '.join(str(p) for p in self.predicates)) |
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def __call__(self, event): |
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""" |
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Handles the event. |
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""" |
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for predicate in self.predicates: |
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if predicate(event): |
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return True |
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return False |
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def __or__(self, other): |
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return Or(*chain(self.predicates, other.predicates if isinstance(other, Or) else (other,))) |
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162
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def __and__(self, other): |
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return And(self, other) |
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ionelmc /
python-hunter
