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#!/usr/bin/env python3
#
# Test NBD client reconnection
#
# Copyright (c) 2019 Virtuozzo International GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os
import subprocess
import iotests
from iotests import file_path, log
nbd_sock, conf_file = file_path('nbd-sock', 'nbd-fault-injector.conf')
def make_conf_file(event):
"""
Create configuration file for the nbd-fault-injector.py
:param event: which event the server should close a connection on
"""
with open(conf_file, 'w') as conff:
conff.write('[inject-error]\nevent={}\nwhen=after'.format(event))
def start_server_NBD(event):
make_conf_file(event)
srv = subprocess.Popen(['nbd-fault-injector.py', '--classic-negotiation',
nbd_sock, conf_file], stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, universal_newlines=True)
line = srv.stdout.readline()
if 'Listening on ' in line:
log('NBD server: started')
else:
log('NBD server: ' + line.rstrip())
return srv
def start_client_NBD():
log('NBD client: QEMU-IO write')
args = iotests.qemu_io_args_no_fmt + \
['-c', 'write -P 0x7 0 3M', '--image-opts',
'driver=nbd,server.type=unix,server.path={},'
'reconnect-delay=7'.format(nbd_sock)]
clt = subprocess.Popen(args, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True)
return clt
def check_proc_NBD(proc, connector):
try:
outs, errs = proc.communicate(timeout=10)
if proc.returncode < 0:
log('NBD {}: EXIT SIGNAL {}\n'.format(connector, proc.returncode))
log(outs)
else:
msg = outs.split('\n', 1)
log('NBD {}: {}'.format(connector, msg[0]))
except subprocess.TimeoutExpired:
proc.kill()
log('NBD {}: ERROR timeout expired'.format(connector))
finally:
if connector == 'server':
os.remove(nbd_sock)
os.remove(conf_file)
srv = start_server_NBD('data')
clt = start_client_NBD()
# The server should close the connection after a client write request
check_proc_NBD(srv, 'server')
# Start the NBD server again
srv = start_server_NBD('reply')
# The client should reconnect and complete the write operation
check_proc_NBD(clt, 'client')
# Make it sure that server terminated
check_proc_NBD(srv, 'server')
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