81 lines
2.7 KiB
Rust
81 lines
2.7 KiB
Rust
//! The accounts data space has a maximum size it is permitted to grow to. This module contains
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//! the constants and types for tracking and metering the accounts data space during program
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//! runtime.
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/// The maximum allowed size, in bytes, of the accounts data
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/// 128 GB was chosen because it is the RAM amount listed under Hardware Recommendations on
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/// [Validator Requirements](https://docs.solana.com/running-validator/validator-reqs), and
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/// validators often put the ledger on a RAM disk (i.e. tmpfs).
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pub const MAX_ACCOUNTS_DATA_LEN: u64 = 128_000_000_000;
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/// Meter and track the amount of available accounts data space
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#[derive(Debug, Default, Clone, Copy, Eq, PartialEq)]
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pub struct AccountsDataMeter {
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/// The initial amount of accounts data space used (in bytes)
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initial: u64,
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/// The amount of accounts data space that has changed since `initial` (in bytes)
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delta: i64,
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}
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impl AccountsDataMeter {
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/// Make a new AccountsDataMeter
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#[must_use]
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pub fn new(initial_accounts_data_len: u64) -> Self {
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Self {
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initial: initial_accounts_data_len,
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delta: 0,
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}
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}
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/// Return the initial amount of accounts data space used (in bytes)
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pub fn initial(&self) -> u64 {
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self.initial
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}
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/// Return the amount of accounts data space that has changed (in bytes)
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pub fn delta(&self) -> i64 {
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self.delta
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}
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/// Return the current amount of accounts data space used (in bytes)
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pub fn current(&self) -> u64 {
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/// NOTE: Mixed integer ops currently not stable, so copying the impl.
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/// * https://github.com/rust-lang/rust/issues/87840
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/// * https://github.com/a1phyr/rust/blob/47edde1086412b36e9efd6098b191ec15a2a760a/library/core/src/num/uint_macros.rs#L1039-L1048
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const fn saturating_add_signed(lhs: u64, rhs: i64) -> u64 {
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let (res, overflow) = lhs.overflowing_add(rhs as u64);
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if overflow == (rhs < 0) {
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res
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} else if overflow {
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u64::MAX
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} else {
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u64::MIN
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}
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}
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saturating_add_signed(self.initial, self.delta)
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}
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/// Adjust the space used by accounts data by `amount` (in bytes).
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pub fn adjust_delta_unchecked(&mut self, amount: i64) {
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self.delta = self.delta.saturating_add(amount);
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_new() {
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let initial = 1234;
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let accounts_data_meter = AccountsDataMeter::new(initial);
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assert_eq!(accounts_data_meter.initial, initial);
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}
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#[test]
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fn test_new_can_use_max_len() {
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let _ = AccountsDataMeter::new(MAX_ACCOUNTS_DATA_LEN);
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}
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}
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