Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/lockfile/mkdirlockfile.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 from __future__ import absolute_import, division
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2
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3 import time
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4 import os
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5 import sys
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6 import errno
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7
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8 from . import (LockBase, LockFailed, NotLocked, NotMyLock, LockTimeout,
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9 AlreadyLocked)
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10
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11
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12 class MkdirLockFile(LockBase):
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13 """Lock file by creating a directory."""
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14 def __init__(self, path, threaded=True, timeout=None):
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15 """
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16 >>> lock = MkdirLockFile('somefile')
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17 >>> lock = MkdirLockFile('somefile', threaded=False)
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18 """
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19 LockBase.__init__(self, path, threaded, timeout)
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20 # Lock file itself is a directory. Place the unique file name into
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21 # it.
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22 self.unique_name = os.path.join(self.lock_file,
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23 "%s.%s%s" % (self.hostname,
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24 self.tname,
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25 self.pid))
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26
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27 def acquire(self, timeout=None):
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28 timeout = timeout if timeout is not None else self.timeout
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29 end_time = time.time()
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30 if timeout is not None and timeout > 0:
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31 end_time += timeout
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32
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33 if timeout is None:
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34 wait = 0.1
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35 else:
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36 wait = max(0, timeout / 10)
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37
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38 while True:
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39 try:
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40 os.mkdir(self.lock_file)
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41 except OSError:
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42 err = sys.exc_info()[1]
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43 if err.errno == errno.EEXIST:
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44 # Already locked.
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45 if os.path.exists(self.unique_name):
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46 # Already locked by me.
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47 return
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48 if timeout is not None and time.time() > end_time:
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49 if timeout > 0:
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50 raise LockTimeout("Timeout waiting to acquire"
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51 " lock for %s" %
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52 self.path)
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53 else:
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54 # Someone else has the lock.
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55 raise AlreadyLocked("%s is already locked" %
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56 self.path)
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57 time.sleep(wait)
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58 else:
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59 # Couldn't create the lock for some other reason
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60 raise LockFailed("failed to create %s" % self.lock_file)
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61 else:
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62 open(self.unique_name, "wb").close()
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63 return
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64
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65 def release(self):
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66 if not self.is_locked():
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67 raise NotLocked("%s is not locked" % self.path)
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68 elif not os.path.exists(self.unique_name):
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69 raise NotMyLock("%s is locked, but not by me" % self.path)
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70 os.unlink(self.unique_name)
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71 os.rmdir(self.lock_file)
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72
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73 def is_locked(self):
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74 return os.path.exists(self.lock_file)
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75
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76 def i_am_locking(self):
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77 return (self.is_locked() and
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78 os.path.exists(self.unique_name))
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79
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80 def break_lock(self):
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81 if os.path.exists(self.lock_file):
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82 for name in os.listdir(self.lock_file):
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83 os.unlink(os.path.join(self.lock_file, name))
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84 os.rmdir(self.lock_file)