feat: remove concurrent transactions and messages handling #86
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Description
This PR removes the concurrent handling of transactions and messages. This is because it might cause some wrongful handling then a transaction contains messages that perform opposite operations.
As an example, consider a transaction that contains, in the given order:
MsgRevokeFeeAllowance
from Alice to BobMsgGrantFeeAllowance
from Alice to BobIf those messages are handled concurrently, since concurrency does not guarantee the order of handling, the following cases are both likely to happen:
MsgRevokeFeeAllowance
gets handled beforeMsgGrantFeeAllowance
MsgGrantFeeAllowance
gets handled beforeMsgRevokeFeeAllowance
If the parser is storing the existing fee allowances, then the following results are equally likely to happen:
MsgRevokeFeeAllowance
gets handled beforeMsgGrantFeeAllowance
), orMsgGrantFeeAllowance
gets handled beforeMsgRevokeFeeAllowance
)Obviously, the second case is not the correct one and is only due to the concurrent handling of messages.
The same might happen on a transaction level, with two transactions containing similar messages.
To solve this, we need to remove the concurrent handling of transactions and messages.
Checklist
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