Function process

program/src/processor/close_account.rs:59–86

(program_id: &Pubkey, accounts: &[AccountInfo])

}

pub(crate) fn process(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let accounts = Accounts::parse(program_id, accounts)?;

    let mut user_account_data = accounts.user.data.borrow_mut();
    let user_account = UserAccount::from_buffer(&mut user_account_data)?;
    if &user_account.header.owner != accounts.user_owner.key {
        msg!("Invalid user account owner provided!");
        return Err(ProgramError::InvalidArgument);
    };

    if user_account.header.number_of_orders != 0
        || user_account.header.quote_token_free != 0
        || user_account.header.base_token_free != 0
    {
        msg!("The user account cannot be closed as it has pending orders or unsettled funds");
        return Err(DexError::UserAccountStillActive.into());
    }

    user_account.header.tag = AccountTag::Closed as u64;

    let mut lamports = accounts.user.lamports.borrow_mut();
    let mut target_lamports = accounts.target_lamports_account.lamports.borrow_mut();

    **target_lamports += **lamports;
    **lamports = 0;

    Ok(())
}