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#
# Ouroboros - Copyright (C) 2016 - 2020
#
# Python API for applications
#
# 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.dev import *
from ouroboros.qos import _fl_to_timespec
# async API
class FlowEventError(Exception):
pass
class FEventType(IntFlag):
FlowPkt = lib.FLOW_PKT
FlowDown = lib.FLOW_DOWN
FlowUp = lib.FLOW_UP
FlowAlloc = lib.FLOW_ALLOC
FlowDealloc = lib.FLOW_DEALLOC
class FEventQueue:
"""
A queue of events waiting to be handled
"""
def __init__(self):
self.__fq = lib.fqueue_create()
if self.__fq is ffi.NULL:
raise MemoryError("Failed to create FEventQueue")
def __del__(self):
lib.fqueue_destroy(self.__fq)
def next(self):
"""
Get the next event
:return: Flow and eventtype on that flow
"""
f = Flow()
f._Flow__fd = lib.fqueue_next(self.__fq)
if f._Flow__fd < 0:
raise FlowEventError
_type = lib.fqueue_type(self.__fq)
if _type < 0:
raise FlowEventError
return f, _type
class FlowSet:
"""
A set of flows that can be monitored for events
"""
def __init__(self,
flows: [Flow] = None):
self.__set = lib.fset_create()
if self.__set is ffi.NULL:
raise MemoryError("Failed to create FlowSet")
if flows is not None:
for flow in flows:
if lib.fset_add(self.__set, flow._Flow__fd) != 0:
lib.fset_destroy(self.__set)
self.__set = ffi.NULL
raise MemoryError("Failed to add flow " + str(flow._Flow__fd) + ".")
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, tb):
lib.fset_destroy(self.__set)
def add(self,
flow: Flow):
"""
Add a Flow
:param flow: The flow object to add
"""
if self.__set is ffi.NULL:
raise ValueError
if lib.fset_add(self.__set, flow._Flow___fd) != 0:
raise MemoryError("Failed to add flow")
def zero(self):
"""
Remove all Flows from this set
"""
if self.__set is ffi.NULL:
raise ValueError
lib.fset_zero(self.__set)
def remove(self,
flow: Flow):
"""
Remove a flow from a set
:param flow:
"""
if self.__set is ffi.NULL:
raise ValueError
lib.fset_del(self.__set, flow._Flow__fd)
def wait(self,
fq: FEventType,
timeo: float = None):
"""
Wait for at least one event on one of the monitored flows
"""
if self.__set is ffi.NULL:
raise ValueError
_timeo = _fl_to_timespec(timeo)
ret = lib.fevent(self.__set, fq._FEventQueue__fq, _timeo)
if ret < 0:
raise FlowEventError
def destroy(self):
lib.fset_destroy(self.__set)
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