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from __future__ import absolute_import |
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import sys |
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from .event import Event |
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class Tracer(object): |
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""" |
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Trace object. |
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""" |
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def __init__(self): |
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self._handler = None |
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self._previous = None |
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def __repr__(self): |
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return '<hunter.tracer.Tracer at 0x%x: %s%s%s%s>' % ( |
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id(self), |
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'<stopped>' if self._handler is None else 'handler=', |
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'' if self._handler is None else repr(self._handler), |
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'' if self._previous is None else ', previous=', |
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'' if self._previous is None else repr(self._previous), |
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) |
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def __call__(self, frame, kind, arg): |
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""" |
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The settrace function. |
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.. note:: |
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This always returns self (drills down) - as opposed to only drilling down when predicate(event) is True |
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because it might |
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match further inside. |
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""" |
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if self._handler is not None: |
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self._handler(Event(frame, kind, arg, self)) |
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return self |
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def trace(self, predicate): |
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""" |
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Starts tracing. Can be used as a context manager (with slightly incorrect semantics - it starts tracing |
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before ``__enter__`` is |
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called). |
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Args: |
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predicates (:class:`hunter.Q` instances): Runs actions if any of the given predicates match. |
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options: Keyword arguments that are passed to :class:`hunter.Q`, for convenience. |
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""" |
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self._handler = predicate |
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self._previous = sys.gettrace() |
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sys.settrace(self) |
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return self |
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def stop(self): |
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""" |
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Stop tracing. |
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""" |
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if self._handler is not None: |
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sys.settrace(self._previous) |
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self._handler = self._previous = None |
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def __enter__(self): |
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return self |
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def __exit__(self, exc_type, exc_val, exc_tb): |
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self.stop() |
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ionelmc /
python-hunter
