def _askCheckCurrentSerial(self, conn, ttid, serial, oid, request_time):
try:
self.app.tm.checkCurrentSerial(ttid, serial, oid)
except ConflictError, err:
# resolvable or not
conn.answer(Packets.AnswerCheckCurrentSerial(1, oid,
err.getTID()))
except NonReadableCell:
logging.info('Ignore check of %s:%s by %s: unassigned partition',
dump(oid), dump(serial), dump(ttid))
locked = ZERO_TID
except NotRegisteredError:
# transaction was aborted, cancel this event
logging.info('Forget serial check of %s:%s by %s delayed by %s',
dump(oid), dump(serial), dump(ttid),
dump(self.app.tm.getLockingTID(oid)))
locked = ZERO_TID
else:
if request_time and SLOW_STORE is not None:
duration = time.time() - request_time
if duration > SLOW_STORE:
logging.info('CheckCurrentSerial delay: %.02fs', duration)
conn.answer(Packets.AnswerCheckCurrentSerial(locked))
# like ClientOperationHandler but read-only & only for tid <= backup_tid
class ClientReadOnlyOperationHandler(ClientOperationHandler):
def _readOnly(self, conn, *args, **kw):
conn.answer(
Errors.ReadOnlyAccess(
'read-only access because cluster is in backuping mode'))
askStoreTransaction = _readOnly
askVoteTransaction = _readOnly
askStoreObject = _readOnly
askFinalTID = _readOnly
askRebaseObject = _readOnly
askRebaseTransaction = _readOnly
self._askCheckCurrentSerial(conn, ttid, serial, oid, time.time())
def _askCheckCurrentSerial(self, conn, ttid, serial, oid, request_time):
try:
self.app.tm.checkCurrentSerial(ttid, serial, oid)
except ConflictError, err:
# resolvable or not
conn.answer(Packets.AnswerCheckCurrentSerial(1, oid,
err.getTID()))
except DelayedError:
# locked by a previous transaction, retry later
try:
self.app.queueEvent(self._askCheckCurrentSerial, conn, (ttid,
serial, oid, request_time), key=(oid, ttid))
except AlreadyPendingError:
conn.answer(Errors.AlreadyPending(dump(oid)))
except NotRegisteredError:
# transaction was aborted, cancel this event
logging.info('Forget serial check of %s:%s by %s delayed by %s',
dump(oid), dump(serial), dump(ttid),
dump(self.app.tm.getLockingTID(oid)))
# send an answer as the client side is waiting for it
conn.answer(Packets.AnswerCheckCurrentSerial(0, oid, serial))
else:
if SLOW_STORE is not None:
duration = time.time() - request_time
if duration > SLOW_STORE:
logging.info('CheckCurrentSerial delay: %.02fs', duration)
conn.answer(Packets.AnswerCheckCurrentSerial(0, oid, serial))
conn.answer(Packets.AnswerCheckCurrentSerial(err.tid))
return
except NonReadableCell:
logging.info('Ignore check of %s:%s by %s: unassigned partition',
dump(oid), dump(serial), dump(ttid))
except NotRegisteredError:
# transaction was aborted, cancel this event
logging.info('Forget serial check of %s:%s by %s delayed by %s',
dump(oid), dump(serial), dump(ttid),
dump(self.app.tm.getLockingTID(oid)))
else:
if request_time and SLOW_STORE is not None:
duration = time.time() - request_time
if duration > SLOW_STORE:
logging.info('CheckCurrentSerial delay: %.02fs', duration)
conn.answer(Packets.AnswerCheckCurrentSerial(None))
# like ClientOperationHandler but read-only & only for tid <= backup_tid
class ClientReadOnlyOperationHandler(ClientOperationHandler):
def _readOnly(self, conn, *args, **kw):
conn.answer(
Errors.ReadOnlyAccess(
'read-only access because cluster is in backuping mode'))
askStoreTransaction = _readOnly
askVoteTransaction = _readOnly
askStoreObject = _readOnly
askFinalTID = _readOnly
askRebaseObject = _readOnly
askRebaseTransaction = _readOnly