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# Copyright 2015 Intel Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Interface for VNF.
"""
import time
from tools import tasks
class IVnf(tasks.Process):
"""
Interface for VNF.
"""
_number_vnfs = 0
def __init__(self):
"""
Initialization method.
Purpose of this method is to initialize all
common Vnf data, no services should be started by
this call (use ``start`` method instead).
"""
self._number = IVnf._number_vnfs
IVnf._number_vnfs = IVnf._number_vnfs + 1
self._log_prefix = 'vnf_%d_cmd : ' % self._number
def start(self):
"""
Starts VNF instance.
This is a blocking function
"""
super(IVnf, self).start()
def stop(self):
"""
Stops VNF instance.
"""
self._logger.info('Killing VNF...')
# force termination of VNF and wait for it to terminate; It will avoid
# sporadic reboot of host. (caused by hugepages or DPDK ports)
super(IVnf, self).kill(signal='-9', sleep=10)
def execute(self, cmd, delay=0):
"""
execute ``cmd`` with given ``delay``.
This method makes asynchronous call to guest system
and waits given ``delay`` before returning. Can be
used with ``wait`` method to create synchronous call.
:param cmd: Command to execute on guest system.
:param delay: Delay (in seconds) to wait after sending
command before returning. Please note that
this value can be floating point which
allows to pass milliseconds.
:returns: None.
"""
self._logger.debug('%s%s', self._log_prefix, cmd)
self._child.sendline(cmd)
time.sleep(delay)
def wait(self, prompt='', timeout=30):
"""
wait for ``prompt`` on guest system for given ``timeout``.
This method ends based on two conditions:
* ``prompt`` has been detected
* ``timeout`` has been reached.
:param prompt: method end condition. If ``prompt``
won't be detected during given timeout,
method will return False.
:param timeout: Time to wait for prompt (in seconds).
Please note that this value can be floating
point which allows to pass milliseconds.
:returns: True if result_cmd has been detected before
timeout has been reached, False otherwise.
"""
self._child.expect(prompt, timeout=timeout)
def execute_and_wait(self, cmd, timeout=30, prompt=''):
"""
execute ``cmd`` with given ``timeout``.
This method makes synchronous call to guest system
and waits till ``cmd`` execution is finished
(based on ``prompt value) or ''timeout'' has
been reached.
:param cmd: Command to execute on guest system.
:param timeout: Timeout till the end of execution is not
detected.
:param prompt: method end condition. If ``prompt``
won't be detected during given timeout,
method will return False. If no argument
or None value will be passed, default
``prompt`` passed in __init__
method will be used.
:returns: True if end of execution has been detected
before timeout has been reached, False otherwise.
"""
self.execute(cmd)
self.wait(prompt=prompt, timeout=timeout)
@staticmethod
def reset_vnf_counter():
"""
Reset internal VNF counters
This method is static
"""
IVnf._number_vnfs = 0
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