问题描述
我下面的代码多次运行而没有任何问题在Linux中互为对方:
I have the following code running without any problem multiple times aftereach other in Linux:
def test_ftp(ftpserver):
with FTP() as f:
f.connect("localhost", port=ftpserver.server_port)
f.login("M1", "bachmann")
f.cwd("/")
f.mkd("FOO")
f.quit()
相同的测试只能在MacOS X中运行一次,之后它将挂起.重新启动计算机是我重新运行测试的唯一方法.
The same tests can only be run once in MacOS X, after that it will simply hang. Rebooting the machines, is the only way I can re-run the tests.
ftpserver
是在 pytest-localftpserver 中定义的测试装置,我正在发布代码出于此原因,我怀疑这是导致错误的原因:
ftpserver
is a test fixture defined in pytest-localftpserver, I am posting the code for this fixture here for the reason that I suspect that it is the cause of error:
class MPFTPServer(multiprocessing.Process):
def __init__(self, username, password, ftp_home, ftp_port, **kwargs):
self._server = SimpleFTPServer(username, password, ftp_home, ftp_port)
self.server_home = self._server.ftp_home
self.anon_root = self._server.anon_root
self.server_port = self._server.ftp_port
super().__init__(**kwargs)
def run(self):
self._server.serve_forever()
def join(self):
self._server.stop()
def stop(self):
self._server.stop()
@pytest.fixture(scope="session", autouse=True)
def ftpserver(request):
"""The returned ``ftpsever`` provides a threaded instance of
``pyftpdlib.servers.FTPServer`` running on localhost.
...
"""
from pytest_localftpserver.plugin import MPFTPServer
ftp_user = os.getenv("FTP_USER", "fakeusername")
ftp_password = os.getenv("FTP_PASS", "qweqwe")
ftp_home = os.getenv("FTP_HOME", "")
ftp_port = int(os.getenv("FTP_PORT", 0))
server = MPFTPServer(ftp_user, ftp_password, ftp_home, ftp_port)
# This is a must in order to clear used sockets
server.daemon = True
server.start()
yield server
server.join()
您能说出为什么此代码在Linux中可重复运行"但在MacOSX中不能重复运行吗?
Can you tell why this code "works repeatedly" in Linux but not in MacOSX?
进一步挖掘,我发现ftp服务器甚至无法启动,因此挂起了.代码崩溃,并显示以下消息:
Digging a bit further, I found that the ftp server will not even start, hence the hanging. The code crashes with the following message:
Process MPFTPServer-1:
Traceback (most recent call last):
File "/opt/pkg/lib/python3.5/multiprocessing/process.py", line 249, in _bootstrap
self.run()
File "/Users/w/.virtualenvs/controller_config/lib/python3.5/site-packages/pytest_localftpserver/plugin.py", line 81, in run
self._server.serve_forever()
File "/Users/w/.virtualenvs/controller_config/lib/python3.5/site-packages/pyftpdlib/servers.py", line 207, in serve_forever
self.ioloop.loop(timeout, blocking)
File "/Users/w/.virtualenvs/controller_config/lib/python3.5/site-packages/pyftpdlib/ioloop.py", line 348, in loop
poll(soonest_timeout)
File "/Users/w/.virtualenvs/controller_config/lib/python3.5/site-packages/pyftpdlib/ioloop.py", line 709, in poll
timeout)
OSError: [Errno 9] Bad file descriptor
推荐答案
好,显然在Mac OS X中错误的文件描述符是已知的:
因此解决方案只是在run
方法内部而不是在__init__
中启动服务器实例:
So the solution was simply to start the server instance inside the run
method, instead in __init__
:
class MPFTPServer(multiprocessing.Process):
def __init__(self, username, password, ftp_home, ftp_port, **kwargs):
self.username = username
self.password = password
self.server_home = ftp_home
self.server_port = ftp_port
super().__init__(**kwargs)
def run(self):
self._server = SimpleFTPServer(self.username, self.password,
self.server_home, self.server_port)
self._server.serve_forever()
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