How to use create_traceback_proxy method in Slash

Best Python code snippet using slash

exception_handling.py

Source:exception_handling.py

...58    """59    if not PYPY and fake_traceback:60        # Only in CPython we're able to fake the original, full traceback61        try:62            fake_tbs = create_traceback_proxy(frame_correction=2)63        except (KeyError, IndexError) as e:64            _logger.warn("Could not extract full traceback for exceptions handling")65            _logger.trace("Extraction failure: {!r}", e, exc_info=True)66            fake_tbs = tuple()67    else:68        fake_tbs = tuple()69    swallow = kwargs.pop("swallow", False)70    swallow_types = kwargs.pop('swallow_types', ())71    if swallow:72        swallow_types = swallow_types + (Exception, )73    assert isinstance(swallow_types, (list, tuple)), 'swallow_types must be either a list or a tuple'74    passthrough_types = kwargs.pop('passthrough_types', ()) + tuple(_ignored_state.ignored_exception_types)75    return _HandlingException(fake_tbs, swallow_types, passthrough_types, kwargs)76class _HandledException(object):77    exception = None78class _HandlingException(object):79    def __init__(self, fake_tbs, swallow_types, passthrough_types, handling_kwargs):80        self._fake_traceback = fake_tbs81        self._kwargs = handling_kwargs82        self._passthrough_types = passthrough_types83        self._swallow_types = swallow_types84        self._handled = _HandledException()85    def __enter__(self):86        return self._handled87    def __exit__(self, *exc_info):88        if not exc_info or exc_info == NO_EXC_INFO:89            return90        exc_value = exc_info[1]91        if isinstance(exc_value, self._passthrough_types):92            return None93        if self._fake_traceback:94            (first_tb, last_tb) = self._fake_traceback95            (second_tb, _) = create_traceback_proxy(exc_info[2])96            last_tb.tb_next = second_tb97            exc_info = (exc_info[0], exc_info[1], first_tb._tb) # pylint: disable=protected-access98        handle_exception(exc_info, **self._kwargs)99        self._handled.exception = exc_info[1]100        skip_types = () if slash_context.session is None else slash_context.session.get_skip_exception_types()101        if isinstance(exc_value, skip_types) or isinstance(exc_value, exceptions.INTERRUPTION_EXCEPTIONS):102            return None103        if self._swallow_types and isinstance(exc_value, self._swallow_types):104            _logger.trace('Swallowing {!r}', exc_value)105            return True106        return None107def handle_exception(exc_info, context=None):108    """109    Call any handlers or debugging code before propagating an exception onwards....

traceback_proxy.py

Source:traceback_proxy.py

...13import inspect14from ..utils.python import PYPY15__all__ = ["create_traceback_proxy"]16if PYPY:17    def create_traceback_proxy(tb=None, frame_correction=0): # pylint: disable=unused-argument18        raise NotImplementedError("Tracebacks manipulation is not possible in PyPy")19else:20    class TracebackProxy(object):21        """22        Wraps the builtin traceback.traceback object.23        Exports exactly the same interface, making these types interchangable24        """25        _Py_ssize_t = ctypes.c_ssize_t26        class _PyObject(ctypes.Structure):27            pass28        # Python build with "--with-pydebug"29        if hasattr(sys, 'getobjects'):30            _PyObject._fields_ = [ # pylint: disable=protected-access31                ('_ob_next', ctypes.POINTER(_PyObject)),32                ('_ob_prev', ctypes.POINTER(_PyObject)),33                ('ob_refcnt', _Py_ssize_t),34                ('ob_type', ctypes.POINTER(_PyObject))35            ]36        else:37            _PyObject._fields_ = [ # pylint: disable=protected-access38                ('ob_refcnt', _Py_ssize_t),39                ('ob_type', ctypes.POINTER(_PyObject))40            ]41        class _Frame(_PyObject):42            """43            Represents a traceback.frame object44            """45            pass46        class _Traceback(_PyObject):47            """48            Represents a traceback.traceback object49            """50            pass51        _Traceback._fields_ = [ # pylint: disable=protected-access52            ('tb_next', ctypes.POINTER(_Traceback)),53            ('tb_frame', ctypes.POINTER(_Frame)),54            ('tb_lasti', ctypes.c_int),55            ('tb_lineno', ctypes.c_int)56        ]57        def __init__(self, tb=None, frame=None):58            assert tb is not None or frame is not None59            self._tb = TracebackProxy.create_traceback()60            self._obj = TracebackProxy._Traceback.from_address(id(self._tb)) # pylint: disable=no-member61            self.tb_next = None62            if tb:63                self.tb_frame = tb.tb_frame64                self.tb_lasti = tb.tb_lasti65                self.tb_lineno = tb.tb_lineno66            else:67                self.tb_frame = frame68                self.tb_lasti = frame.f_lasti69                self.tb_lineno = frame.f_lineno70        def print_tb(self):71            traceback.print_tb(self._tb)72        @property73        def tb_next(self):74            return self._tb.tb_next75        @tb_next.setter76        def tb_next(self, tb):77            if self._tb.tb_next:78                old = TracebackProxy._Traceback.from_address(id(self._tb.tb_next)) # pylint: disable=no-member79                old.ob_refcnt -= 180            assert tb is None or isinstance(tb, types.TracebackType) or isinstance(tb, TracebackProxy)81            if tb:82                obj = TracebackProxy._Traceback.from_address(id(tb)) # pylint: disable=no-member83                obj.ob_refcnt += 184                self._obj.tb_next = ctypes.pointer(obj)85            else:86                self._obj.tb_next = ctypes.POINTER(TracebackProxy._Traceback)()87        @property88        def tb_frame(self):89            return self._tb.tb_frame90        @tb_frame.setter91        def tb_frame(self, frame):92            if self._tb.tb_frame:93                old = TracebackProxy._Frame.from_address(id(self._tb.tb_frame)) # pylint: disable=no-member94                old.ob_refcnt -= 195            if frame:96                assert isinstance(frame, types.FrameType)97                frame = TracebackProxy._Frame.from_address(id(frame)) # pylint: disable=no-member98                frame.ob_refcnt += 199                self._obj.tb_frame = ctypes.pointer(frame)100            else:101                self._obj.tb_frame = ctypes.POINTER(TracebackProxy._Frame)()102        @property103        def tb_lasti(self):104            return self._tb.tb_lasti105        @tb_lasti.setter106        def tb_lasti(self, lasti):107            self._obj.tb_lasti = lasti108        @property109        def tb_lineno(self):110            return self._tb.tb_lineno111        @tb_lineno.setter112        def tb_lineno(self, lineno):113            self._obj.tb_lineno = lineno114        def __eq__(self, other):115            return self._tb == other._tb # pylint: disable=protected-access116        def __ne__(self, other):117            return self._tb != other._tb # pylint: disable=protected-access118        @staticmethod119        def create_traceback():120            try:121                1 / 0122            except:123                tb = sys.exc_info()[2]124            return tb125        @property126        def __class__(self):127            return types.TracebackType128    def create_traceback_proxy(tb=None, frame_correction=0):129        """130        Builds a TracebackProxy object, using a given traceback, or current context if None.131        Returns a tuple with the first and the last tracebacks.132        Works only on CPython (Both Python 2 and 3 are supported)133        :param tb: traceback.traceback object to extract frames from134        :param frame_correction: Specifies the amount of frames to skip135        """136        assert frame_correction >= 0137        if isinstance(tb, types.TracebackType):138            for i in range(frame_correction + 1): # pylint: disable=unused-variable139                first = current = TracebackProxy(tb=tb)140                tb = tb.tb_next141            while tb:142                current.tb_next = TracebackProxy(tb=tb)...

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