web3_utils/
pyth.rs

1use solana_program::{
2    account_info::AccountInfo,
3    clock::Clock,
4    msg,
5    program_error::ProgramError,
6    pubkey::Pubkey,
7    pubkey,
8};
9use pyth_solana_receiver_sdk;
10use std::convert::TryInto;
11
12use crate::{
13    check::{check_account_key},
14    price_update::OriginSolanaPriceUpdateV2,
15};
16
17pub const PYTH_SOL_USD_FEED: Pubkey = pubkey!("7UVimffxr9ow1uXYxsr4LHAcV58mLzhmwaeKvJ1pjLiE");
18
19pub const PRICE_FEED_DISCRIMATOR: [u8; 8] = [34, 241, 35, 99, 157, 126, 244, 205];
20
21pub fn parse_price(data: &[u8]) -> Result<OriginSolanaPriceUpdateV2, ProgramError> {
22    let suffix = &data[..8];
23    if suffix != PRICE_FEED_DISCRIMATOR {
24        msg!("discrimator err");
25        return Err(ProgramError::InvalidArgument);
26    }
27    Ok(OriginSolanaPriceUpdateV2::new(data)?)
28}
29
30/// 获取 Pyth SOL/USD 价格，返回的是 FP32 定点数
31pub fn get_oracle_price_fp32(
32    account: &AccountInfo,
33    clock: &Clock,
34    maximum_age: u64,
35) -> Result<u128, ProgramError> {
36    check_account_key(account, &PYTH_SOL_USD_FEED)?;
37    let data = &account.data.borrow();
38    let update = parse_price(data)?;
39
40    let actual_feed_id = update.0.price_message.feed_id;
41
42    let pyth_solana_receiver_sdk::price_update::Price { price, exponent, .. } =
43        update.0
44            .get_price_no_older_than(clock, maximum_age, &actual_feed_id)
45            .map_err(|e| {
46                msg!("pyth error: {:?}", e);
47                ProgramError::InvalidArgument
48            })?;
49
50    let raw_price = price as i128;
51    let fp32_price = if exponent < 0 {
52        (raw_price << 32) / 10i128.pow((-exponent) as u32)
53    } else {
54        (raw_price << 32) * 10i128.pow(exponent as u32)
55    };
56
57    Ok(fp32_price as u128)
58}
59
60/// 输入：域名价格 (单位 USD，对标 lamports) 
61/// 输出：对应 lamports (u64)
62pub fn get_domain_price_sol(
63    domain_price_usd: u64,
64    sol_pyth_feed_account: &AccountInfo,
65    clock: &Clock,
66) -> Result<u64, ProgramError> {
67    #[cfg(feature = "devnet")]
68    let query_deviation = 600_000;
69    #[cfg(not(feature = "devnet"))]
70    let query_deviation = 60;
71
72    let sol_price_fp32 = get_oracle_price_fp32(sol_pyth_feed_account, clock, query_deviation)?;
73
74    // lamports = (domain_usd << 32) / (sol_usd_price_fp32 / 1e9)
75    // (domain_usd * 1e9) / sol_price(USD)
76    let usd_amount = domain_price_usd / 1_000_000;
77
78    let lamports = ((usd_amount as u128) << 32)
79        .checked_mul(1_000_000_000u128)
80        .ok_or(ProgramError::InvalidArgument)?
81        / sol_price_fp32;
82
83    msg!("{:?} usd = {:?} lamports", domain_price_usd, lamports);
84
85    Ok(lamports.try_into().map_err(|_| ProgramError::InvalidArgument)?)
86}
web3_utils/pyth.rs

web3_utils/
pyth.rs
