Will there be concurrency issues with the contract?

æpp Development
1

Will there be concurrency issues with the contract? For example, transfer 10 gold COINS from the contract account to the user account in a way marked as transfer out after successful transfer? In the case of high concurrency, if the same millisecond is called twice, would 20 COINS be produced?

Such as:

  stateful entrypoint unlock(height : int) =
    if (Chain.block_height < height )
      abort("Height Error")

    let map_accounts = state.day_accounts[height]
    send(map_accounts.index,map_accounts)
    put( state{ day_accounts[height] = {index = 0 , accounts = {}}} )

  stateful entrypoint send(index : int ,map_accounts :map_accounts) =
    if(index >= 0)
   
      let account = map_accounts.accounts[index]

      if(account.time < Chain.timestamp)
        Chain.spend(Call.caller, account.number)
      send(index - 1 , map_accounts)

Does this recursion out of the contract cause security issues?

2

No, there will not be any concurrency issues with this contract. There is only one transaction running at a single point in time.

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