60 lines
2.0 KiB
Rust
60 lines
2.0 KiB
Rust
use crate::error::*;
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use crate::state::*;
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use anchor_lang::prelude::*;
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use anchor_spl::associated_token::AssociatedToken;
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use anchor_spl::token::{Mint, Token, TokenAccount};
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#[derive(Accounts)]
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#[instruction(idx: u16, rate: u64, decimals: u8)]
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pub struct CreateExchangeRate<'info> {
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#[account(mut, has_one = realm_authority)]
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pub registrar: Box<Account<'info, Registrar>>,
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pub realm_authority: Signer<'info>,
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/// Token account that all funds for this mint will be stored in
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#[account(
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init,
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payer = payer,
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associated_token::authority = registrar,
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associated_token::mint = mint,
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)]
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pub vault: Account<'info, TokenAccount>,
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/// Tokens of this mint will produce vote weight
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pub mint: Account<'info, Mint>,
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#[account(mut)]
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pub payer: Signer<'info>,
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pub rent: Sysvar<'info, Rent>,
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pub token_program: Program<'info, Token>,
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pub associated_token_program: Program<'info, AssociatedToken>,
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pub system_program: Program<'info, System>,
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}
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/// Creates a new exchange rate for a given mint. This allows a voter to
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/// deposit the mint in exchange for vote weight. There can only be a single
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/// exchange rate per mint.
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///
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/// `idx`: index of the rate to be set
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/// `rate`: multiplier to apply for converting tokens to vote weight
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/// `decimals`: number of decimals of mint that make one unit of token
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///
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/// The vote weight for one native token will be:
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/// ```
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/// rate * 10^vote_weight_decimals / 10^decimals
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/// ```
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pub fn create_exchange_rate(
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ctx: Context<CreateExchangeRate>,
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idx: u16,
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rate: u64,
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decimals: u8,
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) -> Result<()> {
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msg!("--------create_exchange_rate--------");
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require!(rate > 0, InvalidRate);
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let registrar = &mut ctx.accounts.registrar;
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require!((idx as usize) < registrar.rates.len(), InvalidIndex);
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require!(registrar.rates[idx as usize].rate == 0, RateNotZero);
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registrar.rates[idx as usize] = registrar.new_rate(ctx.accounts.mint.key(), decimals, rate)?;
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Ok(())
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}
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