133 lines
4.1 KiB
Python
Executable File
133 lines
4.1 KiB
Python
Executable File
#! /usr/bin/env python
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import logging
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from multiprocessing import Process
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import os
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import sys
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import tempfile
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import unittest
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if sys.platform != "win32":
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import fcntl
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class SingleInstanceException(BaseException):
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pass
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class SingleInstance(object):
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def __init__(self, flavor_id="", lockfile=""):
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self.initialized = False
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if lockfile:
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self.lockfile = lockfile
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else:
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basename = os.path.splitext(os.path.abspath(sys.argv[0]))[0].replace(
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"/", "-").replace(":", "").replace("\\", "-") + '-%s' % flavor_id + '.lock'
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self.lockfile = os.path.normpath(
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tempfile.gettempdir() + '/' + basename)
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logger.debug("SingleInstance lockfile: " + self.lockfile)
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if sys.platform == 'win32':
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try:
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# file already exists, we try to remove (in case previous
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# execution was interrupted)
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if os.path.exists(self.lockfile):
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os.unlink(self.lockfile)
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self.fd = os.open(
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self.lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
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except OSError:
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type, e, tb = sys.exc_info()
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if e.errno == 13:
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logger.error(
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"Another instance is already running, quitting.")
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raise SingleInstanceException()
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print(e.errno)
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raise
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else: # non Windows
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self.fp = open(self.lockfile, 'w')
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self.fp.flush()
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try:
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fcntl.lockf(self.fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except IOError:
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logger.warning(
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"Another instance is already running, quitting.")
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raise SingleInstanceException()
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self.initialized = True
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def __del__(self):
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if not self.initialized:
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return
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try:
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if sys.platform == 'win32':
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if hasattr(self, 'fd'):
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os.close(self.fd)
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os.unlink(self.lockfile)
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else:
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fcntl.lockf(self.fp, fcntl.LOCK_UN)
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# os.close(self.fp)
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if os.path.isfile(self.lockfile):
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os.unlink(self.lockfile)
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except Exception as e:
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if logger:
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logger.warning(e)
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else:
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print("Unloggable error: %s" % e)
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sys.exit(-1)
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def f(name):
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tmp = logger.level
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logger.setLevel(logging.CRITICAL) # we do not want to see the warning
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try:
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me2 = SingleInstance(flavor_id=name) # noqa
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except SingleInstanceException:
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sys.exit(-1)
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logger.setLevel(tmp)
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pass
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class testSingleton(unittest.TestCase):
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def test_1(self):
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me = SingleInstance(flavor_id="test-1")
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del me # now the lock should be removed
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assert True
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def test_2(self):
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p = Process(target=f, args=("test-2",))
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p.start()
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p.join()
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# the called function should succeed
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assert p.exitcode == 0, "%s != 0" % p.exitcode
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def test_3(self):
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me = SingleInstance(flavor_id="test-3") # noqa -- me should still kept
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p = Process(target=f, args=("test-3",))
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p.start()
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p.join()
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# the called function should fail because we already have another
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# instance running
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assert p.exitcode != 0, "%s != 0 (2nd execution)" % p.exitcode
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# note, we return -1 but this translates to 255 meanwhile we'll
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# consider that anything different from 0 is good
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p = Process(target=f, args=("test-3",))
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p.start()
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p.join()
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# the called function should fail because we already have another
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# instance running
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assert p.exitcode != 0, "%s != 0 (3rd execution)" % p.exitcode
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def test_4(self):
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lockfile = '/tmp/foo.lock'
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me = SingleInstance(lockfile=lockfile)
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assert me.lockfile == lockfile
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logger = logging.getLogger("tendo.singleton")
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if __name__ == "__main__":
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logger.addHandler(logging.StreamHandler())
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logger.setLevel(logging.DEBUG)
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unittest.main()
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