/
_tracer.py
34 lines (26 loc) · 1.12 KB
/
_tracer.py
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# Copyright (c) 2020 OpenCyphal
# This software is distributed under the terms of the MIT License.
# Author: Pavel Kirienko <pavel@opencyphal.org>
from __future__ import annotations
import typing
import dataclasses
import pycyphal.transport.loopback
from pycyphal.transport import Trace, TransferTrace, Capture
@dataclasses.dataclass(frozen=True)
class LoopbackCapture(pycyphal.transport.Capture):
"""
Since the loopback transport is not really a transport, its capture events contain entire transfers.
"""
transfer: pycyphal.transport.AlienTransfer
@staticmethod
def get_transport_type() -> typing.Type[pycyphal.transport.loopback.LoopbackTransport]:
return pycyphal.transport.loopback.LoopbackTransport
class LoopbackTracer(pycyphal.transport.Tracer):
"""
Since loopback transport does not have frames to trace, this tracer simply returns the transfer
from the capture object.
"""
def update(self, cap: Capture) -> typing.Optional[Trace]:
if isinstance(cap, LoopbackCapture):
return TransferTrace(cap.timestamp, cap.transfer, transfer_id_timeout=0)
return None