def do_txn(self, args):
"""
txn -- Command to create IntegerKey transactions
txn <expr> [ && <expr> ]*
"""
txn = integer_key.IntegerKeyTransaction()
# pylint: disable=line-too-long
pattern = re.compile(
r"^\s*(?P<name>[a-zA-Z0-9]+)\s*(?P<verb>[+-]?=)\s*(?P<value>[0-9]+)\s*$"
) # noqa
expressions = args.split('&&')
for expression in expressions:
match = pattern.match(expression)
if not match:
print 'unable to parse the transaction; {0}'.format(expression)
return
update = integer_key.Update()
update.Verb = self._TxnVerbMap[match.group('verb')]
update.Name = match.group('name')
update.Value = long(match.group('value'))
txn.Updates.append(update)
txn.sign_from_node(self.LocalNode)
msg = integer_key.IntegerKeyTransactionMessage()
msg.Transaction = txn
self.sign_and_post(msg)
def _sendtxn(self, update):
"""
Build a transaction for the update, wrap it in a message with all
of the appropriate signatures and post it to the validator
"""
txn = integer_key.IntegerKeyTransaction()
txn.Updates = [update]
# add the last transaction submitted to ensure that the ordering
# in the journal matches the order in which we generated them
if self.LastTransaction:
txn.Dependencies = [self.LastTransaction]
update.Transaction = txn
txn.sign_from_node(self.LocalNode)
txnid = txn.Identifier
if not txn.is_valid(self.CurrentState.State):
logger.warn('transaction failed to apply')
return None
msg = integer_key.IntegerKeyTransactionMessage()
msg.Transaction = txn
msg.SenderID = self.LocalNode.Identifier
msg.sign_from_node(self.LocalNode)
try:
logger.debug('Posting transaction: %s', txnid)
result = self.postmsg(msg.MessageType, msg.dump())
except MessageException as me:
return None
except:
logger.debug('message post failed for some unusual reason')
return None
# if there was no exception thrown then all transactions should return
# a value which is a dictionary with the message that was sent
assert result
# if the message was successfully posted, then save the transaction
# id for future dependencies this could be a problem if the transaction
# fails during application
self.LastTransaction = txnid
txn.apply(self.CurrentState.State)
return txnid
