derive-rs 0.1.16

Rust SDK for Derive.xyz
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use std::str::FromStr;

use alloy::primitives::{I256, U256};
use anyhow::Result;
use bigdecimal::BigDecimal;

fn pow10_bigdecimal(prec: u32) -> BigDecimal {
    let mut v = BigDecimal::from(1u64);
    for _ in 0..prec {
        v *= BigDecimal::from(10u64);
    }
    v
}

pub fn decimal_to_u256(decimal: &BigDecimal) -> Result<U256> {
    decimal_to_u256_with_prec(decimal, 18)
}

pub fn decimal_to_i256(decimal: &BigDecimal) -> Result<I256> {
    decimal_to_i256_with_prec(decimal, 18)
}

pub fn decimal_to_u256_with_prec(decimal: &BigDecimal, prec: u32) -> Result<U256> {
    let factor = pow10_bigdecimal(prec);
    let scaled = (decimal * &factor).with_scale_round(0, bigdecimal::RoundingMode::HalfUp);
    let s = scaled.to_string();
    Ok(U256::from_str(&s)?)
}

pub fn decimal_to_i256_with_prec(decimal: &BigDecimal, prec: u32) -> Result<I256> {
    let factor = pow10_bigdecimal(prec);
    let scaled = (decimal * &factor).with_scale_round(0, bigdecimal::RoundingMode::HalfUp);
    let s = scaled.to_string();
    Ok(I256::from_dec_str(&s)?)
}

pub fn to_e18(value: &BigDecimal) -> Result<U256> {
    decimal_to_u256_with_prec(value, 18)
}