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Merge pull request #515 from gregdhill/feat/oracle-xlsd
feat: consume dia fair price feed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| #![allow(clippy::single_char_pattern)] | ||
| use super::{get_http, PriceFeed}; | ||
| use crate::{config::CurrencyStore, currency::*, Error}; | ||
| use async_trait::async_trait; | ||
| use clap::Parser; | ||
| use reqwest::Url; | ||
| use serde_json::Value; | ||
|
|
||
| #[derive(Parser, Debug, Clone)] | ||
| pub struct DiaFairPriceCli { | ||
| /// Fetch the exchange rate from Dia xLSD feed | ||
| #[clap(long)] | ||
| dia_fair_price_url: Option<Url>, | ||
| } | ||
|
|
||
| pub struct DiaFairPriceApi { | ||
| url: Url, | ||
| } | ||
|
|
||
| impl Default for DiaFairPriceApi { | ||
| fn default() -> Self { | ||
| Self { | ||
| url: Url::parse("https://api.diadata.org/xlsd/").unwrap(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn extract_response(value: Value, alias: &str) -> Option<f64> { | ||
| value | ||
| .as_array()? | ||
| .into_iter() | ||
| .find(|entry| matches!(entry.get("Token").and_then(|value| value.as_str()), Some(token) if token.to_uppercase() == alias))? | ||
| .get("FairPrice")? | ||
| .as_f64() | ||
| } | ||
|
|
||
| impl DiaFairPriceApi { | ||
| pub fn from_opts(opts: DiaFairPriceCli) -> Option<Self> { | ||
| opts.dia_fair_price_url.map(Self::new) | ||
| } | ||
|
|
||
| pub fn new(url: Url) -> Self { | ||
| Self { url } | ||
| } | ||
|
|
||
| async fn get_exchange_rate( | ||
| &self, | ||
| currency_pair: CurrencyPair<Currency>, | ||
| _currency_store: &CurrencyStore<String>, | ||
| ) -> Result<CurrencyPairAndPrice<Currency>, Error> { | ||
| if currency_pair.quote.symbol() != "USD" { | ||
| return Err(Error::InvalidDiaSymbol); | ||
| } | ||
| // this allows us to override the expected token name | ||
| // which is helpful when using the xlsd feed of a wrapped token | ||
| // but we want to submit the currency as the underlying (e.g. KBTC -> BTC) | ||
| let alias = currency_pair.base.path().unwrap_or(currency_pair.base.symbol()); | ||
|
|
||
| let url = self.url.clone(); | ||
| let data = get_http(url).await?; | ||
|
|
||
| let price = extract_response(data, alias.as_str()).ok_or(Error::InvalidResponse)?; | ||
|
|
||
| Ok(CurrencyPairAndPrice { | ||
| pair: currency_pair, | ||
| price, | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| #[async_trait] | ||
| impl PriceFeed for DiaFairPriceApi { | ||
| async fn get_price( | ||
| &self, | ||
| currency_pair: CurrencyPair<Currency>, | ||
| currency_store: &CurrencyStore<String>, | ||
| ) -> Result<CurrencyPairAndPrice<Currency>, Error> { | ||
| self.get_exchange_rate(currency_pair, currency_store).await | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
| use serde_json::json; | ||
|
|
||
| #[test] | ||
| fn should_extract_response() { | ||
| assert_eq!( | ||
| extract_response( | ||
| json!([ | ||
| { | ||
| "Token": "KBTC", | ||
| "FairPrice": 27418.406434486784, | ||
| "BaseAssetSymbol": "BTC", | ||
| "BaseAssetPrice": 27418.406434486784, | ||
| "Issuer": "Interlay" | ||
| }, | ||
| { | ||
| "Token": "vKSM", | ||
| "FairPrice": 24.611983172737727, | ||
| "BaseAssetSymbol": "KSM", | ||
| "BaseAssetPrice": 19.827745134261495, | ||
| "Issuer": "Bifrost" | ||
| } | ||
| ]), | ||
| "KBTC", | ||
| ), | ||
| Some(27418.406434486784) | ||
| ) | ||
| } | ||
| } |
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