[PATCH] iotests: Test nbd client reconnect

[Andrey Shinkevich]

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 <address@hidden>
Signed-off-by: Andrey Shinkevich <address@hidden>
---
 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')
+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
-- 
1.8.3.1