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Edit File : dbutils.py \| Size : 2.89 KB
#------------------------------------------------------------------------ # # Copyright (C) 2000 Autonomous Zone Industries # # License: This is free software. You may use this software for any # purpose including modification/redistribution, so long as # this header remains intact and that you do not claim any # rights of ownership or authorship of this software. This # software has been tested, but no warranty is expressed or # implied. # # Author: Gregory P. Smith <greg@krypto.org> # # Note: I don't know how useful this is in reality since when a # DBLockDeadlockError happens the current transaction is supposed to be # aborted. If it doesn't then when the operation is attempted again # the deadlock is still happening... # --Robin # #------------------------------------------------------------------------ # # import the time.sleep function in a namespace safe way to allow # "from bsddb.dbutils import " # from time import sleep as _sleep import sys absolute_import = (sys.version_info[0] >= 3) if absolute_import : # Because this syntaxis is not valid before Python 2.5 exec("from . import db") else : import db # always sleep at least N seconds between retrys _deadlock_MinSleepTime = 1.0/128 # never sleep more than N seconds between retrys _deadlock_MaxSleepTime = 3.14159 # Assign a file object to this for a "sleeping" message to be written to it # each retry _deadlock_VerboseFile = None def DeadlockWrap(function, _args, *_kwargs): """DeadlockWrap(function, _args, *_kwargs) - automatically retries function in case of a database deadlock. This is a function intended to be used to wrap database calls such that they perform retrys with exponentially backing off sleeps in between when a DBLockDeadlockError exception is raised. A 'max_retries' parameter may optionally be passed to prevent it from retrying forever (in which case the exception will be reraised). d = DB(...) d.open(...) DeadlockWrap(d.put, "foo", data="bar") # set key "foo" to "bar" """ sleeptime = _deadlock_MinSleepTime max_retries = _kwargs.get('max_retries', -1) if 'max_retries' in _kwargs: del _kwargs['max_retries'] while True: try: return function(_args, *_kwargs) except db.DBLockDeadlockError: if _deadlock_VerboseFile: _deadlock_VerboseFile.write( 'dbutils.DeadlockWrap: sleeping %1.3f\n' % sleeptime) _sleep(sleeptime) # exponential backoff in the sleep time sleeptime = 2 if sleeptime > _deadlock_MaxSleepTime: sleeptime = _deadlock_MaxSleepTime max_retries -= 1 if max_retries == -1: raise #------------------------------------------------------------------------ Back

Edit File : dbutils.py | Size : 2.89 KB

#------------------------------------------------------------------------
#
# Copyright (C) 2000 Autonomous Zone Industries
#
# License:      This is free software.  You may use this software for any
#               purpose including modification/redistribution, so long as
#               this header remains intact and that you do not claim any
#               rights of ownership or authorship of this software.  This
#               software has been tested, but no warranty is expressed or
#               implied.
#
# Author: Gregory P. Smith <greg@krypto.org>
#
# Note: I don't know how useful this is in reality since when a
#       DBLockDeadlockError happens the current transaction is supposed to be
#       aborted.  If it doesn't then when the operation is attempted again
#       the deadlock is still happening...
#       --Robin
#
#------------------------------------------------------------------------

#
# import the time.sleep function in a namespace safe way to allow
# "from bsddb.dbutils import *"
#
from time import sleep as _sleep

import sys
absolute_import = (sys.version_info[0] >= 3)
if absolute_import :
    # Because this syntaxis is not valid before Python 2.5
    exec("from . import db")
else :
    import db

# always sleep at least N seconds between retrys
_deadlock_MinSleepTime = 1.0/128
# never sleep more than N seconds between retrys
_deadlock_MaxSleepTime = 3.14159

# Assign a file object to this for a "sleeping" message to be written to it
# each retry
_deadlock_VerboseFile = None

def DeadlockWrap(function, *_args, **_kwargs):
    """DeadlockWrap(function, *_args, **_kwargs) - automatically retries
    function in case of a database deadlock.

This is a function intended to be used to wrap database calls such
    that they perform retrys with exponentially backing off sleeps in
    between when a DBLockDeadlockError exception is raised.

A 'max_retries' parameter may optionally be passed to prevent it
    from retrying forever (in which case the exception will be reraised).

d = DB(...)
        d.open(...)
        DeadlockWrap(d.put, "foo", data="bar")  # set key "foo" to "bar"
    """
    sleeptime = _deadlock_MinSleepTime
    max_retries = _kwargs.get('max_retries', -1)
    if 'max_retries' in _kwargs:
        del _kwargs['max_retries']
    while True:
        try:
            return function(*_args, **_kwargs)
        except db.DBLockDeadlockError:
            if _deadlock_VerboseFile:
                _deadlock_VerboseFile.write(
                    'dbutils.DeadlockWrap: sleeping %1.3f\n' % sleeptime)
            _sleep(sleeptime)
            # exponential backoff in the sleep time
            sleeptime *= 2
            if sleeptime > _deadlock_MaxSleepTime:
                sleeptime = _deadlock_MaxSleepTime
            max_retries -= 1
            if max_retries == -1:
                raise

#------------------------------------------------------------------------

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