79 lines
2.8 KiB
Rust
79 lines
2.8 KiB
Rust
use super::GasEscalator;
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use ethers_core::types::U256;
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/// Linearly increasing gas price.
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///
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///
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/// Start with `initial_price`, then increase it by fixed amount `increase_by` every `every_secs`
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/// seconds until the transaction gets confirmed. There is an optional upper limit.
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///
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/// <https://github.com/makerdao/pymaker/blob/master/pymaker/gas.py#L129>
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#[derive(Clone, Debug)]
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pub struct LinearGasPrice {
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every_secs: u64,
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increase_by: U256,
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max_price: Option<U256>,
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}
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impl LinearGasPrice {
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/// Constructor
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pub fn new<T: Into<U256>>(
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increase_by: T,
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every_secs: impl Into<u64>,
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max_price: Option<T>,
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) -> Self {
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LinearGasPrice {
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every_secs: every_secs.into(),
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increase_by: increase_by.into(),
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max_price: max_price.map(Into::into),
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}
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}
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}
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impl GasEscalator for LinearGasPrice {
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fn get_gas_price(&self, initial_price: U256, time_elapsed: u64) -> U256 {
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let mut result = initial_price + self.increase_by * (time_elapsed / self.every_secs);
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dbg!(time_elapsed, self.every_secs);
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if let Some(max_price) = self.max_price {
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result = std::cmp::min(result, max_price);
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}
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result
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}
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}
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#[cfg(test)]
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// https://github.com/makerdao/pymaker/blob/master/tests/test_gas.py#L107
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mod tests {
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use super::*;
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#[test]
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fn gas_price_increases_with_time() {
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let oracle = LinearGasPrice::new(100, 60u64, None);
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let initial_price = U256::from(1000);
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assert_eq!(oracle.get_gas_price(initial_price, 0), 1000.into());
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assert_eq!(oracle.get_gas_price(initial_price, 1), 1000.into());
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assert_eq!(oracle.get_gas_price(initial_price, 59), 1000.into());
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assert_eq!(oracle.get_gas_price(initial_price, 60), 1100.into());
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assert_eq!(oracle.get_gas_price(initial_price, 119), 1100.into());
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assert_eq!(oracle.get_gas_price(initial_price, 120), 1200.into());
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assert_eq!(oracle.get_gas_price(initial_price, 1200), 3000.into());
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}
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#[test]
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fn gas_price_should_obey_max_value() {
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let oracle = LinearGasPrice::new(100, 60u64, Some(2500));
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let initial_price = U256::from(1000);
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assert_eq!(oracle.get_gas_price(initial_price, 0), 1000.into());
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assert_eq!(oracle.get_gas_price(initial_price, 1), 1000.into());
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assert_eq!(oracle.get_gas_price(initial_price, 59), 1000.into());
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assert_eq!(oracle.get_gas_price(initial_price, 60), 1100.into());
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assert_eq!(oracle.get_gas_price(initial_price, 119), 1100.into());
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assert_eq!(oracle.get_gas_price(initial_price, 120), 1200.into());
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assert_eq!(oracle.get_gas_price(initial_price, 1200), 2500.into());
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assert_eq!(oracle.get_gas_price(initial_price, 3000), 2500.into());
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assert_eq!(oracle.get_gas_price(initial_price, 1000000), 2500.into());
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}
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}
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