[linear2] fix MuxProcess test fixture and some merge fallout

Author: dw

ansible_mitogen/process.py

@@ -114,14 +114,17 @@ def get_worker_model():
     return _worker_model
 
 
-def get_classic_worker_model():
+def get_classic_worker_model(**kwargs):
     """
     Return the single :class:`ClassicWorkerModel` instance, constructing it if
     necessary.
     """
     global _classic_worker_model
+    assert _classic_worker_model is None or (not kwargs), \
+        "ClassicWorkerModel kwargs supplied but model already constructed"
+
     if _classic_worker_model is None:
-        _classic_worker_model = ClassicWorkerModel()
+        _classic_worker_model = ClassicWorkerModel(**kwargs)
     return _classic_worker_model
 
 
@@ -417,9 +420,9 @@ def _initialize(self):
             For testing, if :data:`False`, don't initialize logging.
         """
         common_setup(_init_logging=self._init_logging)
+
         MuxProcess.cls_parent_sock, \
         MuxProcess.cls_child_sock = socket.socketpair()
-
         mitogen.core.set_cloexec(MuxProcess.cls_parent_sock.fileno())
         mitogen.core.set_cloexec(MuxProcess.cls_child_sock.fileno())
 
@@ -434,6 +437,28 @@ def _initialize(self):
         MuxProcess.cls_child_sock.close()
         MuxProcess.cls_child_sock = None
 
+    def _test_reset(self):
+        """
+        Used to clean up in unit tests.
+        """
+        # TODO: split this up a bit.
+        global _classic_worker_model
+        assert MuxProcess.cls_parent_sock is not None
+        MuxProcess.cls_parent_sock.close()
+        MuxProcess.cls_parent_sock = None
+        self.listener_path = None
+        self.router = None
+        self.parent = None
+
+        for mux in self._muxes:
+            pid, status = os.waitpid(mux.pid, 0)
+            status = mitogen.fork._convert_exit_status(status)
+            LOG.debug('mux PID %d %s', pid,
+                mitogen.parent.returncode_to_str(status))
+
+        _classic_worker_model = None
+        set_worker_model(None)
+
     def on_strategy_start(self):
         """
         See WorkerModel.on_strategy_start().
@@ -461,22 +486,26 @@ def get_binding(self, inventory_name):
         return ClassicBinding(self)
 
     def on_binding_close(self):
-        if self.broker:
-            self.broker.shutdown()
-            self.broker.join()
-            self.router = None
-            self.broker = None
+        if not self.broker:
+            return
+
+        self.broker.shutdown()
+        self.broker.join()
+        self.router = None
+        self.broker = None
+        self.listener_path = None
+        self.initialized = False
 
-            # #420: Ansible executes "meta" actions in the top-level process,
-            # meaning "reset_connection" will cause :class:`mitogen.core.Latch`
-            # FDs to be cached and erroneously shared by children on subsequent
-            # WorkerProcess forks. To handle that, call on_fork() to ensure any
-            # shared state is discarded.
-            # #490: only attempt to clean up when it's known that some
-            # resources exist to cleanup, otherwise later __del__ double-call
-            # to close() due to GC at random moment may obliterate an unrelated
-            # Connection's related resources.
-            mitogen.fork.on_fork()
+        # #420: Ansible executes "meta" actions in the top-level process,
+        # meaning "reset_connection" will cause :class:`mitogen.core.Latch` FDs
+        # to be cached and erroneously shared by children on subsequent
+        # WorkerProcess forks. To handle that, call on_fork() to ensure any
+        # shared state is discarded.
+        # #490: only attempt to clean up when it's known that some resources
+        # exist to cleanup, otherwise later __del__ double-call to close() due
+        # to GC at random moment may obliterate an unrelated Connection's
+        # related resources.
+        mitogen.fork.on_fork()
 
 
 class MuxProcess(object):
@@ -514,28 +543,14 @@ class of problems this worker is intended to avoid.
     #: applied to locally executed commands and modules.
     cls_original_env = None
 
-    #: In both processes, this a list of the temporary UNIX sockets used for
-    #: forked WorkerProcesses to contact the forked mux processes.
-    cls_listener_paths = None
-
-    @classmethod
-    def _reset(cls):
-        """
-        Used to clean up in unit tests.
-        """
-        assert cls.worker_sock is not None
-        cls.worker_sock.close()
-        cls.worker_sock = None
-        os.waitpid(cls.worker_pid, 0)
-
     def __init__(self, index):
         self.index = index
         #: Individual path of this process.
         self.path = mitogen.unix.make_socket_path()
 
     def start(self):
-        pid = os.fork()
-        if pid:
+        self.pid = os.fork()
+        if self.pid:
             # Wait for child to boot before continuing.
             mitogen.core.io_op(MuxProcess.cls_parent_sock.recv, 1)
             return

mitogen/fork.py

@@ -121,6 +121,19 @@ def handle_child_crash():
     os._exit(1)
 
 
+def _convert_exit_status(status):
+    """
+    Convert a :func:`os.waitpid`-style exit status to a :mod:`subprocess` style
+    exit status.
+    """
+    if os.WIFEXITED(status):
+        return os.WEXITSTATUS(status)
+    elif os.WIFSIGNALED(status):
+        return -os.WTERMSIG(status)
+    elif os.WIFSTOPPED(status):
+        return -os.WSTOPSIG(status)
+
+
 class Process(mitogen.parent.Process):
     def poll(self):
         try:
@@ -134,12 +147,7 @@ def poll(self):
 
         if not pid:
             return
-        if os.WIFEXITED(status):
-            return os.WEXITSTATUS(status)
-        elif os.WIFSIGNALED(status):
-            return -os.WTERMSIG(status)
-        elif os.WIFSTOPPED(status):
-            return -os.WSTOPSIG(status)
+        return _convert_exit_status(status)
 
 
 class Options(mitogen.parent.Options):

tests/ansible/tests/connection_test.py

@@ -26,13 +26,17 @@ class MuxProcessMixin(object):
     @classmethod
     def setUpClass(cls):
         #mitogen.utils.log_to_file()
-        ansible_mitogen.process.MuxProcess.start(_init_logging=False)
+        cls.model = ansible_mitogen.process.get_classic_worker_model(
+            _init_logging=False
+        )
+        ansible_mitogen.process.set_worker_model(cls.model)
+        cls.model.on_strategy_start()
         super(MuxProcessMixin, cls).setUpClass()
 
     @classmethod
     def tearDownClass(cls):
+        cls.model._test_reset()
         super(MuxProcessMixin, cls).tearDownClass()
-        ansible_mitogen.process.MuxProcess._reset()
 
 
 class ConnectionMixin(MuxProcessMixin):