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Re: [PATCH v2 03/10] Python: add utility function for retrieving port re


From: John Snow
Subject: Re: [PATCH v2 03/10] Python: add utility function for retrieving port redirection
Date: Thu, 25 Mar 2021 14:10:19 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

On 3/23/21 6:15 PM, Cleber Rosa wrote:
Slightly different versions for the same utility code are currently
present on different locations.  This unifies them all, giving
preference to the version from virtiofs_submounts.py, because of the
last tweaks added to it.

While at it, this adds a "qemu.utils" module to host the utility
function and a test.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
  python/qemu/utils.py                     | 35 ++++++++++++++++++++++++
  tests/acceptance/info_usernet.py         | 29 ++++++++++++++++++++
  tests/acceptance/linux_ssh_mips_malta.py | 16 +++++------
  tests/acceptance/virtiofs_submounts.py   | 21 ++++----------
  tests/vm/basevm.py                       |  7 ++---
  5 files changed, 78 insertions(+), 30 deletions(-)
  create mode 100644 python/qemu/utils.py
  create mode 100644 tests/acceptance/info_usernet.py

diff --git a/python/qemu/utils.py b/python/qemu/utils.py
new file mode 100644
index 0000000000..89a246ab30
--- /dev/null
+++ b/python/qemu/utils.py
@@ -0,0 +1,35 @@
+"""
+QEMU utility library
+
+This offers miscellaneous utility functions, which may not be easily
+distinguishable or numerous to be in their own module.
+"""
+
+# Copyright (C) 2021 Red Hat Inc.
+#
+# Authors:
+#  Cleber Rosa <crosa@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2.  See
+# the COPYING file in the top-level directory.
+#
+
+import re
+from typing import Optional
+
+
+def get_info_usernet_hostfwd_port(info_usernet_output: str) -> Optional[int]:
+    """
+    Returns the port given to the hostfwd parameter via info usernet
+
+    :param info_usernet_output: output generated by hmp command "info usernet"
+    :param info_usernet_output: str
+    :return: the port number allocated by the hostfwd option
+    :rtype: int

I think, unless you know something I don't, that I would prefer to keep type information in the "live" annotations where they can be checked against rot.

+    """
+    for line in info_usernet_output.split('\r\n'):
+        regex = r'TCP.HOST_FORWARD.*127\.0\.0\.1\s+(\d+)\s+10\.'
+        match = re.search(regex, line)
+        if match is not None:
+            return int(match[1])
+    return None

I wonder if more guest-specific code doesn't belong elsewhere, but I don't have a strong counter-suggestion, so I would probably ACK this for now.

(Are you okay with the idea that we won't include the utils module in the PyPI upload? I think I would like to avoid shipping something like this outside of our castle walls, but agree that having it in the common code area somewhere for our own use is good.)

diff --git a/tests/acceptance/info_usernet.py b/tests/acceptance/info_usernet.py
new file mode 100644
index 0000000000..9c1fd903a0
--- /dev/null
+++ b/tests/acceptance/info_usernet.py
@@ -0,0 +1,29 @@
+# Test for the hmp command "info usernet"
+#
+# Copyright (c) 2021 Red Hat, Inc.
+#
+# Author:
+#  Cleber Rosa <crosa@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+
+from avocado_qemu import Test
+
+from qemu.utils import get_info_usernet_hostfwd_port
+
+
+class InfoUsernet(Test):
+
+    def test_hostfwd(self):
+        self.vm.add_args('-netdev', 'user,id=vnet,hostfwd=:127.0.0.1:0-:22')
+        self.vm.launch()
+        res = self.vm.command('human-monitor-command',
+                              command_line='info usernet')
+        port = get_info_usernet_hostfwd_port(res)
+        self.assertIsNotNone(port,
+                             ('"info usernet" output content does not seem to '
+                              'contain the redirected port'))
+        self.assertGreater(port, 0,
+                           ('Found a redirected port that is not greater than'
+                            ' zero'))
diff --git a/tests/acceptance/linux_ssh_mips_malta.py 
b/tests/acceptance/linux_ssh_mips_malta.py
index 6dbd02d49d..052008f02d 100644
--- a/tests/acceptance/linux_ssh_mips_malta.py
+++ b/tests/acceptance/linux_ssh_mips_malta.py
@@ -18,6 +18,8 @@
  from avocado.utils import archive
  from avocado.utils import ssh
+from qemu.utils import get_info_usernet_hostfwd_port
+
class LinuxSSH(Test): @@ -70,18 +72,14 @@ def get_kernel_info(self, endianess, wordsize):
      def setUp(self):
          super(LinuxSSH, self).setUp()
- def get_portfwd(self):
+    def ssh_connect(self, username, password):
+        self.ssh_logger = logging.getLogger('ssh')
          res = self.vm.command('human-monitor-command',
                                command_line='info usernet')
-        line = res.split('\r\n')[2]
-        port = re.split(r'.*TCP.HOST_FORWARD.*127\.0\.0\.1 (\d+)\s+10\..*',
-                        line)[1]
+        port = get_info_usernet_hostfwd_port(res)
+        if not port:
+            self.cancel("Failed to retrieve SSH port")
          self.log.debug("sshd listening on port:" + port)
-        return port
-
-    def ssh_connect(self, username, password):
-        self.ssh_logger = logging.getLogger('ssh')
-        port = self.get_portfwd()
          self.ssh_session = ssh.Session(self.VM_IP, port=int(port),
                                         user=username, password=password)
          for i in range(10):
diff --git a/tests/acceptance/virtiofs_submounts.py 
b/tests/acceptance/virtiofs_submounts.py
index ca64b76301..57a7047342 100644
--- a/tests/acceptance/virtiofs_submounts.py
+++ b/tests/acceptance/virtiofs_submounts.py
@@ -9,6 +9,8 @@
  from avocado_qemu import wait_for_console_pattern
  from avocado.utils import ssh
+from qemu.utils import get_info_usernet_hostfwd_port
+
def run_cmd(args):
      subp = subprocess.Popen(args,
@@ -73,27 +75,14 @@ class VirtiofsSubmountsTest(LinuxTest):
      :avocado: tags=accel:kvm
      """
- def get_portfwd(self):
-        port = None
-
+    def ssh_connect(self, username, keyfile):
+        self.ssh_logger = logging.getLogger('ssh')
          res = self.vm.command('human-monitor-command',
                                command_line='info usernet')
-        for line in res.split('\r\n'):
-            match = \
-                re.search(r'TCP.HOST_FORWARD.*127\.0\.0\.1\s+(\d+)\s+10\.',
-                          line)
-            if match is not None:
-                port = int(match[1])
-                break
-
+        port = get_info_usernet_hostfwd_port(res)
          self.assertIsNotNone(port)
          self.assertGreater(port, 0)
          self.log.debug('sshd listening on port: %d', port)
-        return port
-
-    def ssh_connect(self, username, keyfile):
-        self.ssh_logger = logging.getLogger('ssh')
-        port = self.get_portfwd()
          self.ssh_session = ssh.Session('127.0.0.1', port=port,
                                         user=username, key=keyfile)
          for i in range(10):
diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
index 00f1d5ca8d..75ce07df36 100644
--- a/tests/vm/basevm.py
+++ b/tests/vm/basevm.py
@@ -21,6 +21,7 @@
  sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
  from qemu.accel import kvm_available
  from qemu.machine import QEMUMachine
+from qemu.utils import get_info_usernet_hostfwd_port
  import subprocess
  import hashlib
  import argparse
@@ -306,11 +307,7 @@ def boot(self, img, extra_args=[]):
          self.console_init()
          usernet_info = guest.qmp("human-monitor-command",
                                   command_line="info usernet")
-        self.ssh_port = None
-        for l in usernet_info["return"].splitlines():
-            fields = l.split()
-            if "TCP[HOST_FORWARD]" in fields and "22" in fields:
-                self.ssh_port = l.split()[3]
+        self.ssh_port = get_info_usernet_hostfwd_port(usernet_info)
          if not self.ssh_port:
              raise Exception("Cannot find ssh port from 'info usernet':\n%s" % 
\
                              usernet_info)





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