40 lines
1.3 KiB
Rust
40 lines
1.3 KiB
Rust
use anchor_lang::__private::bytemuck::Zeroable;
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use anchor_lang::prelude::*;
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/// Exchange rate for an asset that can be used to mint voting rights.
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#[zero_copy]
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#[derive(AnchorSerialize, AnchorDeserialize, Default)]
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pub struct ExchangeRateEntry {
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/// Mint for this entry.
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pub mint: Pubkey,
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/// Mint decimals.
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pub mint_decimals: u8,
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/// Exchange rate for 1.0 decimal-respecting unit of mint currency
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/// into the common vote currency.
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///
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/// Example: If rate=2, then 1.000 of mint currency has a vote weight
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/// of 2.000000 in common vote currency. In the example mint decimals
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/// was 3 and common_decimals was 6.
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pub rate: u64,
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/// Factor for converting mint native currency to common vote currency,
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/// including decimal handling.
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///
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/// Examples:
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/// - if common and mint have the same number of decimals, this is the same as 'rate'
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/// - common decimals = 6, mint decimals = 3, rate = 5 -> 500
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pub conversion_factor: u64,
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}
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impl ExchangeRateEntry {
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/// Converts an amount in this ExchangeRateEntry's mint's native currency
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/// to the equivalent common registrar vote currency amount.
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pub fn convert(&self, amount_native: u64) -> u64 {
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amount_native.checked_mul(self.conversion_factor).unwrap()
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}
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}
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unsafe impl Zeroable for ExchangeRateEntry {}
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