0xfnzero
108 lines
3.4 KiB
Rust
108 lines
3.4 KiB
Rust
use solana_sdk::pubkey::Pubkey;
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use crate::{
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instruction::utils::pumpfun::global_constants::{CREATOR_FEE, FEE_BASIS_POINTS},
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utils::calc::common::compute_fee,
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};
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/// Calculates the amount of tokens that can be purchased with a given SOL amount
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/// using the bonding curve formula.
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///
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/// # Arguments
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/// * `virtual_token_reserves` - Virtual token reserves in the bonding curve
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/// * `virtual_sol_reserves` - Virtual SOL reserves in the bonding curve
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/// * `real_token_reserves` - Actual token reserves available for purchase
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/// * `creator` - Creator's public key (affects fee calculation)
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/// * `amount` - SOL amount to spend (in lamports)
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///
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/// # Returns
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/// The amount of tokens that will be received (in token's smallest unit)
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#[inline]
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pub fn get_buy_token_amount_from_sol_amount(
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virtual_token_reserves: u128,
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virtual_sol_reserves: u128,
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real_token_reserves: u128,
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creator: Pubkey,
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amount: u64,
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) -> u64 {
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if amount == 0 {
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return 0;
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}
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if virtual_token_reserves == 0 {
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return 0;
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}
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let total_fee_basis_points =
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FEE_BASIS_POINTS + if creator != Pubkey::default() { CREATOR_FEE } else { 0 };
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// Convert to u128 to prevent overflow
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let amount_128 = amount as u128;
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let total_fee_basis_points_128 = total_fee_basis_points as u128;
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let input_amount = amount_128
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.checked_mul(10_000)
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.and_then(|v| v.checked_div(total_fee_basis_points_128 + 10_000))
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.unwrap_or(0);
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let Some(denominator) = virtual_sol_reserves.checked_add(input_amount) else { return 0 };
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if denominator == 0 {
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return 0;
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}
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let tokens_received = input_amount
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.checked_mul(virtual_token_reserves)
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.and_then(|v| v.checked_div(denominator))
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.unwrap_or(0)
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.min(real_token_reserves);
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tokens_received.min(u64::MAX as u128) as u64
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}
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/// Calculates the amount of SOL that will be received when selling a given token amount
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/// using the bonding curve formula with transaction fees deducted.
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///
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/// # Arguments
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/// * `virtual_token_reserves` - Virtual token reserves in the bonding curve
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/// * `virtual_sol_reserves` - Virtual SOL reserves in the bonding curve
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/// * `creator` - Creator's public key (affects fee calculation)
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/// * `amount` - Token amount to sell (in token's smallest unit)
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///
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/// # Returns
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/// The amount of SOL that will be received after fees (in lamports)
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#[inline]
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pub fn get_sell_sol_amount_from_token_amount(
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virtual_token_reserves: u128,
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virtual_sol_reserves: u128,
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creator: Pubkey,
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amount: u64,
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) -> u64 {
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if amount == 0 {
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return 0;
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}
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// migrated bonding curve
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if virtual_token_reserves == 0 {
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return 0;
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}
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let amount_128 = amount as u128;
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// Calculate SOL amount received from selling tokens using constant product formula
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let Some(numerator) = amount_128.checked_mul(virtual_sol_reserves) else {
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return u64::MAX;
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};
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let denominator = virtual_token_reserves.checked_add(amount_128).unwrap_or(1);
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let sol_cost = numerator.checked_div(denominator).unwrap_or(0);
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let total_fee_basis_points =
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FEE_BASIS_POINTS + if creator != Pubkey::default() { CREATOR_FEE } else { 0 };
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let total_fee_basis_points_128 = total_fee_basis_points as u128;
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// Calculate transaction fee
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let fee = compute_fee(sol_cost, total_fee_basis_points_128);
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sol_cost.saturating_sub(fee).min(u64::MAX as u128) as u64
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}
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