use socketpair to test scapy sniff()

foosocket.py

from scapy.all import *


class FooSocket(Thread, SuperSocket):
    def __init__(self, frame_defs):
        super(FooSocket, self).__init__()
        self._frame_defs = frame_defs
        self.ins = None

    def __enter__(self):
        self._s0, self._s1 = socket.socketpair(socket.AF_UNIX, socket.SOCK_DGRAM)
        self.ins = self._s1

        self.start()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self._s0.close()
        self._s0 = None
        self._s1.close()
        self._s1 = None

    def run(self):
        for frame_def in self._frame_defs:
            frame, ifg = frame_def
            try:
                self._s0.send(frame)
            except (socket.error, AttributeError):
                break
            time.sleep(ifg)

    def fileno(self):
        return self._s1.fileno()


def _dump(p):
    p.show()

test_frame_set = [
    ((Ether() / IP() / TCP() / Raw(b'bar_0')).do_build(), 0.02),
    ((Ether() / IP() / TCP() / Raw(b'bar_1')).do_build(), 0.02),
    ((Ether() / IP() / TCP() / Raw(b'bar_2')).do_build(), 0.02),
    ((Ether() / IP() / TCP() / Raw(b'bar_3')).do_build(), 0.08),
    ((Ether() / IP() / TCP() / Raw(b'bar_4')).do_build(), 0.02)
]

with FooSocket(test_frame_set) as fs:
    sniff(opened_socket=fs, timeout=1, interpkt_timeout=0.06, prn=_dump)

i'm beginner in scapy, how we can using opened_socket I have little bit confused