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from __future__ import absolute_import |
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2
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3
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import sys |
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4
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import threading |
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6
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from .event import Event |
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7
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8
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9
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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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14
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15
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def __init__(self, threading_support=False): |
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self._handler = None |
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self._previous = None |
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self._threading_previous = None |
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self.threading_support = threading_support |
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21
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@property |
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def handler(self): |
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return self._handler |
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@property |
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def previous(self): |
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return self._previous |
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def __repr__(self): |
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return '<hunter.tracer.Tracer at 0x%x: threading_support=%s, %s%s%s%s>' % ( |
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id(self), |
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self.threading_support, |
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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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39
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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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43
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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 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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self._handler = predicate |
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if self.threading_support: |
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self._threading_previous = getattr(threading, '_trace_hook', None) |
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threading.settrace(self) |
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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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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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if self.threading_support: |
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threading.settrace(self._threading_previous) |
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self._threading_previous = None |
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68
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69
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def __enter__(self): |
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return self |
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72
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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
