Re: [PATCH] iotests: Test nbd client reconnect

[Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>]

On 27/10/2019 17:48, Andrey Shinkevich wrote:
> The stress test for an NBD client. The NBD server is disconnected after
> a client write operation. The NBD client should reconnect and retry the
> operation.
> 
> Suggested-by: Denis V. Lunev <den@openvz.org>
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> ---
>   tests/qemu-iotests/277     | 91 ++++++++++++++++++++++++++++++++++++++++++++++
>   tests/qemu-iotests/277.out |  7 ++++
>   tests/qemu-iotests/group   |  1 +
>   3 files changed, 99 insertions(+)
>   create mode 100755 tests/qemu-iotests/277
>   create mode 100644 tests/qemu-iotests/277.out
> 
> diff --git a/tests/qemu-iotests/277 b/tests/qemu-iotests/277
> new file mode 100755
> index 0000000..46a29b7
> --- /dev/null
> +++ b/tests/qemu-iotests/277
> @@ -0,0 +1,91 @@
> +#!/usr/bin/env python
> +#
> +# Test nbd client reconnect
> +#
> +# 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 sys
> +import io
> +import subprocess
> +import iotests
> +from iotests import file_path, log
> +
> +
> +def start_server_NBD(nbd_sock, conf_file):
> +    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: {}'.format(line.rstrip()))
> +
> +    return srv
> +
> +
> +def check_server_NBD(srv):
> +    exitcode = srv.wait(timeout=10)
> +
> +    if exitcode < 0:
> +        sys.stderr.write('NBD server: ERROR %i\n' % (-exitcode))
> +        log(srv.communicate()[0])
> +    else:
> +        line = srv.stdout.readline()
> +        log('NBD server: ' + line.rstrip())
> +
> +    os.remove(nbd_sock)
> +    os.remove(conf_file)
> +
> +
> +def make_conf_file(conf_file, event):
> +    if os.path.exists(conf_file):
> +        os.remove(conf_file)
> +
> +    with open(conf_file, "w+") as conff:
> +        conff.write("[inject-error]\nevent={}\nwhen=after".format(event))
> +
> +
> +disk, nbd_sock = file_path('disk', 'nbd-sock')

The 'disk' is going to be remooved as a construction waste.

> +nbd_uri = 'nbd+unix:///?socket=' + nbd_sock
> +if os.path.exists(nbd_sock):
> +    os.remove(nbd_sock)
> +
> +conf_file = os.path.join(iotests.test_dir, "nbd-fault-injector.conf")
> +make_conf_file(conf_file, "data")
> +srv = start_server_NBD(nbd_sock, conf_file)
> +
> +log('NBD client: QEMU-IO write')
> +args = iotests.qemu_io_args + ['-f', 'raw', '-c', 'write -P 0x7 0 3M', nbd_uri]
> +clt = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
> +
> +check_server_NBD(srv)
> +
> +make_conf_file(conf_file, "reply")
> +srv = start_server_NBD(nbd_sock, conf_file)
> +
> +exitcode = clt.wait(timeout=10)
> +if exitcode < 0:
> +    sys.stderr.write('qemu-io received signal %i: %s\n' %
> +                     (-exitcode, ' '.join(args)))
> +
> +for line in io.TextIOWrapper(clt.stdout, encoding="utf-8"):
> +    if "3 MiB" not in line:
> +        log('NBD client: ' + line.rstrip())
> +
> +check_server_NBD(srv)
> diff --git a/tests/qemu-iotests/277.out b/tests/qemu-iotests/277.out
> new file mode 100644
> index 0000000..07e6e82
> --- /dev/null
> +++ b/tests/qemu-iotests/277.out
> @@ -0,0 +1,7 @@
> +NBD server: started
> +NBD client: QEMU-IO write
> +NBD server: Closing connection on rule match inject-error
> +NBD server: started
> +NBD client: Connection closed
> +NBD client: wrote 3145728/3145728 bytes at offset 0
> +NBD server: Closing connection on rule match inject-error
> diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
> index af322af..22ef1b8 100644
> --- a/tests/qemu-iotests/group
> +++ b/tests/qemu-iotests/group
> @@ -282,3 +282,4 @@
>   267 rw auto quick snapshot
>   268 rw auto quick
>   270 rw backing quick
> +277 rw
> 

-- 
With the best regards,
Andrey Shinkevich