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basefee.rs
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basefee.rs
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//! Helpers for working with EIP-1559 base fee
/// Calculate base fee for next block. [EIP-1559](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1559.md) spec
pub fn calculate_next_block_base_fee(
gas_used: u64,
gas_limit: u64,
base_fee: u64,
base_fee_params: crate::BaseFeeParams,
) -> u64 {
let gas_target = gas_limit / base_fee_params.elasticity_multiplier;
if gas_used == gas_target {
return base_fee
}
if gas_used > gas_target {
let gas_used_delta = gas_used - gas_target;
let base_fee_delta = std::cmp::max(
1,
base_fee as u128 * gas_used_delta as u128 /
gas_target as u128 /
base_fee_params.max_change_denominator as u128,
);
base_fee + (base_fee_delta as u64)
} else {
let gas_used_delta = gas_target - gas_used;
let base_fee_per_gas_delta = base_fee as u128 * gas_used_delta as u128 /
gas_target as u128 /
base_fee_params.max_change_denominator as u128;
base_fee.saturating_sub(base_fee_per_gas_delta as u64)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn calculate_base_fee_success() {
let base_fee = [
1000000000, 1000000000, 1000000000, 1072671875, 1059263476, 1049238967, 1049238967, 0,
1, 2,
];
let gas_used = [
10000000, 10000000, 10000000, 9000000, 10001000, 0, 10000000, 10000000, 10000000,
10000000,
];
let gas_limit = [
10000000, 12000000, 14000000, 10000000, 14000000, 2000000, 18000000, 18000000,
18000000, 18000000,
];
let next_base_fee = [
1125000000, 1083333333, 1053571428, 1179939062, 1116028649, 918084097, 1063811730, 1,
2, 3,
];
for i in 0..base_fee.len() {
assert_eq!(
next_base_fee[i],
calculate_next_block_base_fee(
gas_used[i],
gas_limit[i],
base_fee[i],
crate::BaseFeeParams::ethereum(),
)
);
}
}
#[cfg(feature = "optimism")]
#[test]
fn calculate_optimism_base_fee_success() {
let base_fee = [
1000000000, 1000000000, 1000000000, 1072671875, 1059263476, 1049238967, 1049238967, 0,
1, 2,
];
let gas_used = [
10000000, 10000000, 10000000, 9000000, 10001000, 0, 10000000, 10000000, 10000000,
10000000,
];
let gas_limit = [
10000000, 12000000, 14000000, 10000000, 14000000, 2000000, 18000000, 18000000,
18000000, 18000000,
];
let next_base_fee = [
1100000048, 1080000000, 1065714297, 1167067046, 1128881311, 1028254188, 1098203452, 1,
2, 3,
];
for i in 0..base_fee.len() {
assert_eq!(
next_base_fee[i],
calculate_next_block_base_fee(
gas_used[i],
gas_limit[i],
base_fee[i],
crate::BaseFeeParams::optimism(),
)
);
}
}
#[cfg(feature = "optimism")]
#[test]
fn calculate_optimism_goerli_base_fee_success() {
let base_fee = [
1000000000, 1000000000, 1000000000, 1072671875, 1059263476, 1049238967, 1049238967, 0,
1, 2,
];
let gas_used = [
10000000, 10000000, 10000000, 9000000, 10001000, 0, 10000000, 10000000, 10000000,
10000000,
];
let gas_limit = [
10000000, 12000000, 14000000, 10000000, 14000000, 2000000, 18000000, 18000000,
18000000, 18000000,
];
let next_base_fee = [
1180000000, 1146666666, 1122857142, 1244299375, 1189416692, 1028254188, 1144836295, 1,
2, 3,
];
for i in 0..base_fee.len() {
assert_eq!(
next_base_fee[i],
calculate_next_block_base_fee(
gas_used[i],
gas_limit[i],
base_fee[i],
crate::BaseFeeParams::optimism_goerli(),
)
);
}
}
}