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#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
from contextlib import contextmanager
import wttest, wiredtiger
# Timestamp abstraction class
class WiredTigerTimeStamp(object):
def __init__(self, initial_timestamp=1):
self.ts = initial_timestamp
def incr(self):
self.ts += 1
def get_incr(self):
ret = self.ts
self.ts += 1
return ret
def get(self):
return self.ts
# This allows us to easily "wrap" an operation in a transaction at the
# next timestamp. This global function version can be called externally.
@contextmanager
def session_timestamped_transaction(session, timestamper):
need_commit = False
if timestamper != None and \
not (hasattr(session, "_has_transaction") and session._has_transaction):
session.begin_transaction()
need_commit = True
yield
if need_commit:
config = 'commit_timestamp=%x' % timestamper.get_incr()
#wttest.WiredTigerTestCase.tty('commit_transaction ' + config)
session.commit_transaction(config)
elif timestamper != None:
config = 'commit_timestamp=%x' % timestamper.get_incr()
#wttest.WiredTigerTestCase.tty('timestamp_transaction ' + config)
session.timestamp_transaction(config)
# This class acts as a "proxy" for a Cursor. All methods, etc.
# are passed to the implementation object (via __getattr__),
# except for the ones that we explicitly override here.
class TimestampedCursor(wiredtiger.Cursor):
def __init__(self, session, cursor, timeStamper, testcase):
self._cursor = cursor
self._timeStamper = timeStamper
self._testcase = testcase
self._session = session
if not hasattr(session, "_has_transaction"):
session._has_transaction = False
def __getattr__(self, name):
return getattr(self._cursor, name)
# A more convenient way to "wrap" an operation in a transaction
@contextmanager
def timestamped_transaction(self):
with session_timestamped_transaction(self._session, self._timeStamper):
yield
# Overrides Cursor.insert
def insert(self):
with self.timestamped_transaction():
return self._cursor.insert()
# Overrides Cursor.update
def update(self):
with self.timestamped_transaction():
return self._cursor.update()
# Overrides Cursor.remove
def remove(self):
with self.timestamped_transaction():
return self._cursor.remove()
# Overrides Cursor.modify
def modify(self, mods):
with self.timestamped_transaction():
return self._cursor.modify(mods)
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