87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
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# -*- coding: utf-8 -
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#
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# This file is part of gunicorn released under the MIT license.
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# See the NOTICE for more information.
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import errno
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import os
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import tempfile
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class Pidfile(object):
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"""\
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Manage a PID file. If a specific name is provided
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it and '"%s.oldpid" % name' will be used. Otherwise
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we create a temp file using os.mkstemp.
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"""
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def __init__(self, fname):
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self.fname = fname
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self.pid = None
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def create(self, pid):
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oldpid = self.validate()
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if oldpid:
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if oldpid == os.getpid():
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return
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msg = "Already running on PID %s (or pid file '%s' is stale)"
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raise RuntimeError(msg % (oldpid, self.fname))
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self.pid = pid
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# Write pidfile
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fdir = os.path.dirname(self.fname)
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if fdir and not os.path.isdir(fdir):
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raise RuntimeError("%s doesn't exist. Can't create pidfile." % fdir)
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fd, fname = tempfile.mkstemp(dir=fdir)
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os.write(fd, ("%s\n" % self.pid).encode('utf-8'))
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if self.fname:
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os.rename(fname, self.fname)
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else:
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self.fname = fname
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os.close(fd)
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# set permissions to -rw-r--r--
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os.chmod(self.fname, 420)
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def rename(self, path):
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self.unlink()
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self.fname = path
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self.create(self.pid)
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def unlink(self):
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""" delete pidfile"""
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try:
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with open(self.fname, "r") as f:
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pid1 = int(f.read() or 0)
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if pid1 == self.pid:
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os.unlink(self.fname)
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except:
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pass
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def validate(self):
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""" Validate pidfile and make it stale if needed"""
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if not self.fname:
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return
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try:
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with open(self.fname, "r") as f:
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try:
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wpid = int(f.read())
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except ValueError:
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return
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try:
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os.kill(wpid, 0)
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return wpid
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except OSError as e:
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if e.args[0] == errno.EPERM:
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return wpid
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if e.args[0] == errno.ESRCH:
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return
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raise
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except IOError as e:
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if e.args[0] == errno.ENOENT:
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return
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raise
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