def _import_next_layer(self, proto, length=None):
"""Import next layer extractor.
Arguments:
proto (str): next layer protocol name
length (int): valid (*non-padding*) length
Returns:
pcapkit.protocols.protocol.Protocol: instance of next layer
"""
if self._exproto == 'null' and self._exlayer == 'None':
from pcapkit.protocols.raw import \
Raw as protocol # pylint: disable=import-outside-toplevel
else:
from pcapkit.foundation.analysis import \
analyse as protocol # pylint: disable=import-outside-toplevel
if length == 0:
next_ = NoPayload()
elif self._onerror:
next_ = beholder_ng(protocol)(self._file,
length,
termination=self._sigterm)
else:
next_ = protocol(self._file, length, termination=self._sigterm)
return next_
def _import_next_layer(self, proto, length, error=False): # pylint: disable=arguments-differ
"""Import next layer extractor.
This method currently supports following protocols as registered in
:data:`~pcapkit.const.reg.linktype.LinkType`:
.. list-table::
:header-rows: 1
* - ``proto``
- Protocol
* - 1
- :class:`~pcapkit.protocols.link.ethernet.Ethernet`
* - 228
- :class:`~pcapkit.protocols.internet.ipv4.IPv4`
* - 229
- :class:`~pcapkit.protocols.internet.ipv6.IPv6`
Arguments:
proto (pcapkit.const.reg.linktype.LinkType): next layer protocol index
length (int): valid (*non-padding*) length
Keyword arguments:
error (bool): if function called on error
Returns:
pcapkit.protocols.protocol.Protocol: instance of next layer
"""
module, name = self.__proto__[int(proto)]
try:
protocol = getattr(importlib.import_module(module), name)
except (ImportError, AttributeError):
from pcapkit.protocols.raw import \
Raw as protocol # pylint: disable=import-outside-toplevel
next_ = protocol(self._file,
length,
error=error,
layer=self._exlayer,
protocol=self._exproto)
return next_