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use std::{fmt, iter::Sum}; use num::Zero; use casper_types::U512; use crate::shared::motes::Motes; #[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)] pub struct Gas(U512); impl Gas { pub fn new(value: U512) -> Self { Gas(value) } pub fn value(&self) -> U512 { self.0 } pub fn from_motes(motes: Motes, conv_rate: u64) -> Option<Self> { motes .value() .checked_div(U512::from(conv_rate)) .map(Self::new) } pub fn checked_add(&self, rhs: Self) -> Option<Self> { self.0.checked_add(rhs.value()).map(Self::new) } pub fn checked_sub(&self, rhs: Self) -> Option<Self> { self.0.checked_sub(rhs.value()).map(Self::new) } } impl fmt::Display for Gas { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{:?}", self.0) } } impl std::ops::Add for Gas { type Output = Gas; fn add(self, rhs: Self) -> Self::Output { let val = self.value() + rhs.value(); Gas::new(val) } } impl std::ops::Sub for Gas { type Output = Gas; fn sub(self, rhs: Self) -> Self::Output { let val = self.value() - rhs.value(); Gas::new(val) } } impl std::ops::Div for Gas { type Output = Gas; fn div(self, rhs: Self) -> Self::Output { let val = self.value() / rhs.value(); Gas::new(val) } } impl std::ops::Mul for Gas { type Output = Gas; fn mul(self, rhs: Self) -> Self::Output { let val = self.value() * rhs.value(); Gas::new(val) } } impl std::ops::AddAssign for Gas { fn add_assign(&mut self, rhs: Self) { self.0 += rhs.0 } } impl Zero for Gas { fn zero() -> Self { Gas::new(U512::zero()) } fn is_zero(&self) -> bool { self.0.is_zero() } } impl Sum for Gas { fn sum<I: Iterator<Item = Self>>(iter: I) -> Self { iter.fold(Gas::zero(), std::ops::Add::add) } } impl From<u32> for Gas { fn from(gas: u32) -> Self { let gas_u512: U512 = gas.into(); Gas::new(gas_u512) } } impl From<u64> for Gas { fn from(gas: u64) -> Self { let gas_u512: U512 = gas.into(); Gas::new(gas_u512) } } #[cfg(test)] mod tests { use casper_types::U512; use crate::shared::{gas::Gas, motes::Motes}; #[test] fn should_be_able_to_get_instance_of_gas() { let initial_value = 1; let gas = Gas::new(U512::from(initial_value)); assert_eq!( initial_value, gas.value().as_u64(), "should have equal value" ) } #[test] fn should_be_able_to_compare_two_instances_of_gas() { let left_gas = Gas::new(U512::from(1)); let right_gas = Gas::new(U512::from(1)); assert_eq!(left_gas, right_gas, "should be equal"); let right_gas = Gas::new(U512::from(2)); assert_ne!(left_gas, right_gas, "should not be equal") } #[test] fn should_be_able_to_add_two_instances_of_gas() { let left_gas = Gas::new(U512::from(1)); let right_gas = Gas::new(U512::from(1)); let expected_gas = Gas::new(U512::from(2)); assert_eq!((left_gas + right_gas), expected_gas, "should be equal") } #[test] fn should_be_able_to_subtract_two_instances_of_gas() { let left_gas = Gas::new(U512::from(1)); let right_gas = Gas::new(U512::from(1)); let expected_gas = Gas::new(U512::from(0)); assert_eq!((left_gas - right_gas), expected_gas, "should be equal") } #[test] fn should_be_able_to_multiply_two_instances_of_gas() { let left_gas = Gas::new(U512::from(100)); let right_gas = Gas::new(U512::from(10)); let expected_gas = Gas::new(U512::from(1000)); assert_eq!((left_gas * right_gas), expected_gas, "should be equal") } #[test] fn should_be_able_to_divide_two_instances_of_gas() { let left_gas = Gas::new(U512::from(1000)); let right_gas = Gas::new(U512::from(100)); let expected_gas = Gas::new(U512::from(10)); assert_eq!((left_gas / right_gas), expected_gas, "should be equal") } #[test] fn should_be_able_to_convert_from_mote() { let mote = Motes::new(U512::from(100)); let gas = Gas::from_motes(mote, 10).expect("should have gas"); let expected_gas = Gas::new(U512::from(10)); assert_eq!(gas, expected_gas, "should be equal") } #[test] fn should_be_able_to_default() { let gas = Gas::default(); let expected_gas = Gas::new(U512::from(0)); assert_eq!(gas, expected_gas, "should be equal") } #[test] fn should_be_able_to_compare_relative_value() { let left_gas = Gas::new(U512::from(100)); let right_gas = Gas::new(U512::from(10)); assert!(left_gas > right_gas, "should be gt"); let right_gas = Gas::new(U512::from(100)); assert!(left_gas >= right_gas, "should be gte"); assert!(left_gas <= right_gas, "should be lte"); let left_gas = Gas::new(U512::from(10)); assert!(left_gas < right_gas, "should be lt"); } #[test] fn should_default() { let left_gas = Gas::new(U512::from(0)); let right_gas = Gas::default(); assert_eq!(left_gas, right_gas, "should be equal"); let u512 = U512::zero(); assert_eq!(left_gas.value(), u512, "should be equal"); } #[test] fn should_support_checked_div_from_motes() { let motes = Motes::new(U512::zero()); let conv_rate = 0; let maybe = Gas::from_motes(motes, conv_rate); assert!(maybe.is_none(), "should be none due to divide by zero"); } }