1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
# 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
self._logger.debug('Initializing %s. VM with index %s',
self._number + 1, self._number)
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.
"""
if self.is_running():
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)
def validate_start(self, dummy_result):
""" Validate call of VNF start()
"""
if self._child and self._child.isalive():
return True
else:
return False
def validate_stop(self, result):
""" Validate call of fVNF stop()
"""
return not self.validate_start(result)
@staticmethod
def reset_vnf_counter():
"""
Reset internal VNF counters
This method is static
"""
IVnf._number_vnfs = 0
|
