state: nonce management

[Wondertan]

Current state

Before sending a transaction, the node requests the sequence number from the state.

Problem

• You can't send multiple transactions to be included in one block because they will have the same bounce.
• One roundtrip latency to APP node before sending TX

Solution

Nounce/sequence management:

• Fetch current nounce on StateModule start per each account registered the node(currently one only)
• Maintain a local state of the nounces per account
• Increment them every time a new tx is sent

Caveats

Doesn't support cases where multiple transactions are sent from the same account but from different wallets. (the only real solution here is a mempool connection between wallets)

Impl Details

• Keyring.Signer, which is available on the CoreAccessor has QueryAccountNumber method that needs to be called on start only instead of per each TX to use the nounce node keeps and to avoid roundtrip problem
• Before sending each transaction nounce has to be incremented on the node through SetSequence method

Refs

Further improvements to this workflow on the app side: celestiaorg/celestia-app#1910