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#
# Ouroboros - Copyright (C) 2016 - 2020
#
# Python API for applications - QoS
#
# Dimitri Staessens <dimitri@ouroboros.rocks>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# version 2.1 as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., http://www.fsf.org/about/contact/.
#
from _ouroboros_cffi import ffi
from math import modf
from typing import Optional
# Some constants
MILLION = 1000 * 1000
BILLION = 1000 * 1000 * 1000
class QoSSpec:
"""
delay: In ms, default 1000s
bandwidth: In bits / s, default 0
availability: Class of 9s, default 0
loss: Packet loss in ppm, default MILLION
ber: Bit error rate, errors per billion bits. default BILLION
in_order: In-order delivery, enables FRCT, default 0
max_gap: Maximum interruption in ms, default MILLION
cypher_s: Requested encryption strength in bits
"""
def __init__(self,
delay: int = MILLION,
bandwidth: int = 0,
availability: int = 0,
loss: int = 1,
ber: int = MILLION,
in_order: int = 0,
max_gap: int = MILLION,
cypher_s: int = 0):
self.delay = delay
self.bandwidth = bandwidth
self.availability = availability
self.loss = loss
self.ber = ber
self.in_order = in_order
self.max_gap = max_gap
self.cypher_s = cypher_s
def _fl_to_timespec(timeo: float):
if timeo is None:
return ffi.NULL
elif timeo <= 0:
return ffi.new("struct timespec *", [0, 0])
else:
frac, whole = modf(timeo)
_timeo = ffi.new("struct timespec *")
_timeo.tv_sec = whole
_timeo.tv_nsec = frac * BILLION
return _timeo
def _timespec_to_fl(_timeo) -> Optional[float]:
if _timeo is ffi.NULL:
return None
elif _timeo.tv_sec <= 0 and _timeo.tv_nsec == 0:
return 0
else:
return _timeo.tv_sec + _timeo.tv_nsec / BILLION
def _qos_to_qosspec(qos: QoSSpec):
if qos is None:
return ffi.NULL
else:
return ffi.new("qosspec_t *",
[qos.delay,
qos.bandwidth,
qos.availability,
qos.loss,
qos.ber,
qos.in_order,
qos.max_gap,
qos.cypher_s])
def _qosspec_to_qos(_qos) -> Optional[QoSSpec]:
if _qos is ffi.NULL:
return None
else:
return QoSSpec(delay=_qos.delay,
bandwidth=_qos.bandwidth,
availability=_qos.availability,
loss=_qos.loss,
ber=_qos.ber,
in_order=_qos.in_order,
max_gap=_qos.max_gap,
cypher_s=_qos.cypher_s)
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