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In Pinocchio 0.10.1, Rent::get()?.minimum_balance(DATA_LEN) has been deprecated.

So I am trying to use the Rent::try_minimum_balance()

  let rent = Rent::from_account_view(my_account)?;// fails to run at 
//unlikely(account_view.address() != &RENT_ID) inside the from_account_view().
//What is RENT_ID?

  let rent = Rent::from_bytes(my_account.borrow_unchecked())?;
  // causes the lamports below to be 0 
  let lamports = Rent::try_minimum_balance(&rent, Mint22::BASE_LEN)?;

How to make rent from a given account ?

And what if such my_account does not exist yet?

Docs: https://docs.rs/pinocchio/latest/pinocchio/sysvars/rent/struct.Rent.html

1 Answer 1

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1

You have to pass the rent sysvar account (which has account address RENT_ID) to get the Rent struct first, then use that to get the required rent based on how many bytes of data your account will hold:

// rent_account_sysvar has address RENT_ID
let rent_sysvar = Rent::from_account_view(rent_account_sysvar)?;
// my_account_len is how many bytes are/will be stored inside my_account
let rent_for_my_account = rent_sysvar.try_minimum_balance(my_account_len)?;
Improve this answer
3
  • rent_account_sysvar's address is SysvarRent111111111111111111111111111111111 Thank you Commented 10 hours ago
  • is Rent::from_bytes(account.borrow_unchecked()) used for existing accounts? Commented 9 hours ago
  • Rent::from_bytes is for when you got the rent sysvar data via some other means and want to convert it to a Rent struct. To calculate rent for foreign accounts it's always with the byte length like I showed in my answer. Commented 34 mins ago

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