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File dbutils.py

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

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

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2024-06-24 12:45:06
..	DIR	-	drwxr-xr-x	2024-06-24 12:45:06
__init__.py	text/x-python	15.61 KB	-rw-r--r--	2024-04-10 04:58:35
__init__.pyc	application/octet-stream	12.16 KB	-rw-r--r--	2024-04-10 04:58:46
__init__.pyo	application/octet-stream	12.16 KB	-rw-r--r--	2024-04-10 04:58:46
db.py	text/plain	2.67 KB	-rw-r--r--	2024-04-10 04:58:35
db.pyc	application/octet-stream	592 B	-rw-r--r--	2024-04-10 04:58:46
db.pyo	application/octet-stream	592 B	-rw-r--r--	2024-04-10 04:58:46
dbobj.py	text/x-python	11.07 KB	-rw-r--r--	2024-04-10 04:58:35
dbobj.pyc	application/octet-stream	18.38 KB	-rw-r--r--	2024-04-10 04:58:46
dbobj.pyo	application/octet-stream	18.38 KB	-rw-r--r--	2024-04-10 04:58:46
dbrecio.py	text/x-python	5.18 KB	-rw-r--r--	2024-04-10 04:58:35
dbrecio.pyc	application/octet-stream	5.18 KB	-rw-r--r--	2024-04-10 04:58:46
dbrecio.pyo	application/octet-stream	5.18 KB	-rw-r--r--	2024-04-10 04:58:46
dbshelve.py	text/x-python	11.29 KB	-rw-r--r--	2024-04-10 04:58:35
dbshelve.pyc	application/octet-stream	12.72 KB	-rw-r--r--	2024-04-10 04:58:46
dbshelve.pyo	application/octet-stream	12.72 KB	-rw-r--r--	2024-04-10 04:58:46
dbtables.py	text/x-python	30.14 KB	-rw-r--r--	2024-04-10 04:58:35
dbtables.pyc	application/octet-stream	23.96 KB	-rw-r--r--	2024-04-10 04:58:46
dbtables.pyo	application/octet-stream	23.82 KB	-rw-r--r--	2024-04-10 04:58:43
dbutils.py	text/x-python	2.89 KB	-rw-r--r--	2024-04-10 04:58:35
dbutils.pyc	application/octet-stream	1.59 KB	-rw-r--r--	2024-04-10 04:58:46
dbutils.pyo	application/octet-stream	1.59 KB	-rw-r--r--	2024-04-10 04:58:46

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