Merge pull request FRRouting#16827 from LabNConsulting/chopps/fix-on-…

…error-with-xdist

improvements for xdist mode

tests/topotests/conftest.py

@@ -18,12 +18,11 @@
 import lib.fixtures
 import pytest
 from lib.common_config import generate_support_bundle
-from lib.micronet_compat import Mininet
 from lib.topogen import diagnose_env, get_topogen
 from lib.topolog import get_test_logdir, logger
 from lib.topotest import json_cmp_result
 from munet import cli
-from munet.base import Commander, proc_error
+from munet.base import BaseMunet, Commander, proc_error
 from munet.cleanup import cleanup_current, cleanup_previous
 from munet.config import ConfigOptionsProxy
 from munet.testing.util import pause_test
@@ -86,7 +85,7 @@ def pytest_addoption(parser):
     parser.addoption(
         "--cli-on-error",
         action="store_true",
-        help="Mininet cli on test failure",
+        help="Munet cli on test failure",
     )
 
     parser.addoption(
@@ -711,7 +710,7 @@ def pytest_runtest_makereport(item, call):
         wait_for_procs = []
         # Really would like something better than using this global here.
         # Not all tests use topogen though so get_topogen() won't work.
-        for node in Mininet.g_mnet_inst.hosts.values():
+        for node in BaseMunet.g_unet.hosts.values():
             pause = True
 
             if is_tmux:
@@ -720,13 +719,15 @@ def pytest_runtest_makereport(item, call):
                     if not isatty
                     else None
                 )
-                Commander.tmux_wait_gen += 1
-                wait_for_channels.append(channel)
+                # If we don't have a tty to pause on pause for tmux windows to exit
+                if channel is not None:
+                    Commander.tmux_wait_gen += 1
+                    wait_for_channels.append(channel)
 
             pane_info = node.run_in_window(
                 error_cmd,
                 new_window=win_info is None,
-                background=True,
+                background=not isatty,
                 title="{} ({})".format(title, node.name),
                 name=title,
                 tmux_target=win_info,
@@ -737,9 +738,13 @@ def pytest_runtest_makereport(item, call):
                     win_info = pane_info
             elif is_xterm:
                 assert isinstance(pane_info, subprocess.Popen)
-                wait_for_procs.append(pane_info)
+                # If we don't have a tty to pause on pause for xterm procs to exit
+                if not isatty:
+                    wait_for_procs.append(pane_info)
 
         # Now wait on any channels
+        if wait_for_channels or wait_for_procs:
+            logger.info("Pausing for error command windows to exit")
         for channel in wait_for_channels:
             logger.debug("Waiting on TMUX channel %s", channel)
             commander.cmd_raises([commander.get_exec_path("tmux"), "wait", channel])
@@ -752,10 +757,10 @@ def pytest_runtest_makereport(item, call):
     if error and item.config.option.cli_on_error:
         # Really would like something better than using this global here.
         # Not all tests use topogen though so get_topogen() won't work.
-        if Mininet.g_mnet_inst:
-            cli.cli(Mininet.g_mnet_inst, title=title, background=False)
+        if BaseMunet.g_unet:
+            cli.cli(BaseMunet.g_unet, title=title, background=False)
         else:
-            logger.error("Could not launch CLI b/c no mininet exists yet")
+            logger.error("Could not launch CLI b/c no munet exists yet")
 
     if pause and isatty:
         pause_test()
@@ -800,9 +805,20 @@ def coverage_finish(terminalreporter, config):
 def pytest_terminal_summary(terminalreporter, exitstatus, config):
     # Only run if we are the top level test runner
     is_xdist_worker = "PYTEST_XDIST_WORKER" in os.environ
+    is_xdist = os.environ["PYTEST_XDIST_MODE"] != "no"
     if config.option.cov_topotest and not is_xdist_worker:
         coverage_finish(terminalreporter, config)
 
+    if (
+        is_xdist
+        and not is_xdist_worker
+        and (
+            bool(config.getoption("--pause"))
+            or bool(config.getoption("--pause-at-end"))
+        )
+    ):
+        pause_test("pause-at-end")
+
 
 #
 # Add common fixtures available to all tests as parameters

tests/topotests/munet/cli.py

@@ -745,7 +745,7 @@ def flush(self):
         await writer.drain()
 
 
-async def remote_cli(unet, prompt, title, background):
+async def remote_cli(unet, prompt, title, background, remote_wait=False):
     """Open a CLI in a new window."""
     try:
         if not unet.cli_sockpath:
@@ -756,6 +756,13 @@ async def remote_cli(unet, prompt, title, background):
             unet.cli_sockpath = sockpath
             logging.info("server created on :\n%s\n", sockpath)
 
+        if remote_wait:
+            wait_tmux = bool(os.getenv("TMUX", ""))
+            wait_x11 = not wait_tmux and bool(os.getenv("DISPLAY", ""))
+        else:
+            wait_tmux = False
+            wait_x11 = False
+
         # Open a new window with a new CLI
         python_path = await unet.async_get_exec_path(["python3", "python"])
         us = os.path.realpath(__file__)
@@ -765,7 +772,32 @@ async def remote_cli(unet, prompt, title, background):
         if prompt:
             cmd += f" --prompt='{prompt}'"
         cmd += " " + unet.cli_sockpath
-        unet.run_in_window(cmd, title=title, background=False)
+
+        channel = None
+        if wait_tmux:
+            from .base import Commander  # pylint: disable=import-outside-toplevel
+
+            channel = "{}-{}".format(os.getpid(), Commander.tmux_wait_gen)
+            logger.info("XXX channel is %s", channel)
+            # If we don't have a tty to pause on pause for tmux windows to exit
+            if channel is not None:
+                Commander.tmux_wait_gen += 1
+
+        pane_info = unet.run_in_window(
+            cmd, title=title, background=False, wait_for=channel
+        )
+
+        if wait_tmux and channel:
+            from .base import commander  # pylint: disable=import-outside-toplevel
+
+            logger.debug("Waiting on TMUX CLI window")
+            await commander.async_cmd_raises(
+                [commander.get_exec_path("tmux"), "wait", channel]
+            )
+        elif wait_x11 and isinstance(pane_info, subprocess.Popen):
+            logger.debug("Waiting on xterm CLI process %s", pane_info)
+            if hasattr(asyncio, "to_thread"):
+                await asyncio.to_thread(pane_info.wait)  # pylint: disable=no-member
     except Exception as error:
         logging.error("cli server: unexpected exception: %s", error)
 
@@ -906,8 +938,22 @@ def cli(
     prompt=None,
     background=True,
 ):
+    # In the case of no tty a remote_cli will be used, and we want it to wait on finish
+    # of the spawned cli.py script, otherwise it returns back here and exits async loop
+    # which kills the server side CLI socket operation.
+    remote_wait = not sys.stdin.isatty()
+
     asyncio.run(
-        async_cli(unet, histfile, sockpath, force_window, title, prompt, background)
+        async_cli(
+            unet,
+            histfile,
+            sockpath,
+            force_window,
+            title,
+            prompt,
+            background,
+            remote_wait=remote_wait,
+        )
     )
 
 
@@ -919,12 +965,14 @@ async def async_cli(
     title=None,
     prompt=None,
     background=True,
+    remote_wait=False,
 ):
     if prompt is None:
         prompt = "munet> "
 
     if force_window or not sys.stdin.isatty():
-        await remote_cli(unet, prompt, title, background)
+        await remote_cli(unet, prompt, title, background, remote_wait)
+        return
 
     if not unet:
         logger.debug("client-cli using sockpath %s", sockpath)

tests/topotests/munet/native.py

@@ -2733,7 +2733,7 @@ def __init__(
                     ),
                     "format": "stdout HOST [HOST ...]",
                     "help": "tail -f on the stdout of the qemu/cmd for this node",
-                    "new-window": True,
+                    "new-window": {"background": True, "ns_only": True},
                 },
                 {
                     "name": "stderr",
@@ -2743,7 +2743,7 @@ def __init__(
                     ),
                     "format": "stderr HOST [HOST ...]",
                     "help": "tail -f on the stdout of the qemu/cmd for this node",
-                    "new-window": True,
+                    "new-window": {"background": True, "ns_only": True},
                 },
             ]
         }

tests/topotests/munet/testing/util.py

@@ -52,22 +52,22 @@ def pause_test(desc=""):
     asyncio.run(async_pause_test(desc))
 
 
-def retry(retry_timeout, initial_wait=0, expected=True):
+def retry(retry_timeout, initial_wait=0, retry_sleep=2, expected=True):
     """decorator: retry while functions return is not None or raises an exception.
 
     * `retry_timeout`: Retry for at least this many seconds; after waiting
                        initial_wait seconds
     * `initial_wait`: Sleeps for this many seconds before first executing function
+    * `retry_sleep`: The time to sleep between retries.
     * `expected`: if False then the return logic is inverted, except for exceptions,
                   (i.e., a non None ends the retry loop, and returns that value)
     """
 
     def _retry(func):
         @functools.wraps(func)
         def func_retry(*args, **kwargs):
-            retry_sleep = 2
-
             # Allow the wrapped function's args to override the fixtures
+            _retry_sleep = float(kwargs.pop("retry_sleep", retry_sleep))
             _retry_timeout = kwargs.pop("retry_timeout", retry_timeout)
             _expected = kwargs.pop("expected", expected)
             _initial_wait = kwargs.pop("initial_wait", initial_wait)
@@ -82,13 +82,21 @@ def func_retry(*args, **kwargs):
             while True:
                 seconds_left = (retry_until - datetime.datetime.now()).total_seconds()
                 try:
-                    ret = func(*args, **kwargs)
-                    if _expected and ret is None:
+                    try:
+                        ret = func(*args, seconds_left=seconds_left, **kwargs)
+                    except TypeError as error:
+                        if "seconds_left" not in str(error):
+                            raise
+                        ret = func(*args, **kwargs)
+
+                    logging.debug("Function returned %s", ret)
+
+                    positive_result = ret is None
+                    if _expected == positive_result:
                         logging.debug("Function succeeds")
                         return ret
-                    logging.debug("Function returned %s", ret)
                 except Exception as error:
-                    logging.info("Function raised exception: %s", str(error))
+                    logging.info('Function raised exception: "%s"', error)
                     ret = error
 
                 if seconds_left < 0:
@@ -99,10 +107,10 @@ def func_retry(*args, **kwargs):
 
                 logging.info(
                     "Sleeping %ds until next retry with %.1f retry time left",
-                    retry_sleep,
+                    _retry_sleep,
                     seconds_left,
                 )
-                time.sleep(retry_sleep)
+                time.sleep(_retry_sleep)
 
         func_retry._original = func  # pylint: disable=W0212
         return func_retry