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Alexander Movchan
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| use crate::fee_ticker::ticker_api::TokenPriceAPI; | ||
| use async_trait::async_trait; | ||
| use chrono::{DateTime, NaiveDateTime, Utc}; | ||
| use failure::Error; | ||
| use models::node::TokenPrice; | ||
| use models::primitives::UnsignedRatioSerializeAsDecimal; | ||
| use num::rational::Ratio; | ||
| use num::BigUint; | ||
| use reqwest::Url; | ||
| use std::collections::HashMap; | ||
| use std::str::FromStr; | ||
| use std::time::Duration; | ||
|
|
||
| /// The limit of time we are willing to wait for response. | ||
| const REQUEST_TIMEOUT: Duration = Duration::from_millis(5000); | ||
|
|
||
| const COINGECKO_API_BASE_URL: &str = "https://api.coingecko.com/api/v3/"; | ||
|
|
||
| pub struct CoinGeckoAPI { | ||
| client: reqwest::Client, | ||
| token_ids: HashMap<String, String>, | ||
| } | ||
|
|
||
| impl CoinGeckoAPI { | ||
| pub fn new(client: reqwest::Client) -> Result<Self, Error> { | ||
| let token_list_url = Url::from_str(COINGECKO_API_BASE_URL) | ||
| .unwrap() | ||
| .join("coins/list") | ||
| .expect("failed to join URL path"); | ||
|
|
||
| let token_list = reqwest::blocking::get(token_list_url) | ||
| .map_err(|err| failure::format_err!("CoinGecko API request failed: {}", err))? | ||
| .json::<CoinGeckoTokenList>()?; | ||
|
|
||
| let mut token_ids = HashMap::new(); | ||
| for token in token_list.0 { | ||
| token_ids.insert(token.symbol, token.id); | ||
| } | ||
|
|
||
| Ok(Self { client, token_ids }) | ||
| } | ||
| } | ||
|
|
||
| #[async_trait] | ||
| impl TokenPriceAPI for CoinGeckoAPI { | ||
| async fn get_price(&self, token_symbol: &str) -> Result<TokenPrice, Error> { | ||
| let token_id = self | ||
| .token_ids | ||
| .get(&token_symbol.to_lowercase()) | ||
| .ok_or_else(|| { | ||
| failure::format_err!("Token '{}' is not listed on CoinGecko", token_symbol) | ||
| })?; | ||
|
|
||
| let market_chart_url = Url::from_str(COINGECKO_API_BASE_URL) | ||
| .unwrap() | ||
| .join(format!("coins/{}/market_chart", token_id).as_str()) | ||
| .expect("failed to join URL path"); | ||
|
|
||
| let request = self | ||
| .client | ||
| .get(market_chart_url) | ||
| .query(&[("vs_currency", "usd"), ("days", "1")]); | ||
|
|
||
| let api_request_future = tokio::time::timeout(REQUEST_TIMEOUT, request.send()); | ||
|
|
||
| let market_chart = api_request_future | ||
| .await | ||
| .map_err(|_| failure::format_err!("CoinGecko API request timeout"))? | ||
| .map_err(|err| failure::format_err!("CoinGecko API request failed: {}", err))? | ||
| .json::<CoinGeckoMarketChart>() | ||
| .await?; | ||
|
|
||
| let last_updated_timestamp_ms = market_chart | ||
| .prices | ||
| .last() | ||
| .ok_or_else(|| failure::format_err!("CoinGecko returned empty price data"))? | ||
| .0; | ||
|
|
||
| let usd_price = market_chart | ||
| .prices | ||
| .into_iter() | ||
| .map(|token_price| token_price.1) | ||
| .min() | ||
| .ok_or_else(|| failure::format_err!("CoinGecko returned empty price data"))?; | ||
|
|
||
| let naive_last_updated = NaiveDateTime::from_timestamp( | ||
| last_updated_timestamp_ms / 1_000, // ms to s | ||
| (last_updated_timestamp_ms % 1_000) as u32 * 1_000_000, // ms to ns | ||
| ); | ||
| let last_updated = DateTime::<Utc>::from_utc(naive_last_updated, Utc); | ||
|
|
||
| Ok(TokenPrice { | ||
| usd_price, | ||
| last_updated, | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| #[derive(Debug, Clone, Serialize, Deserialize)] | ||
| struct CoinGeckoTokenInfo { | ||
| id: String, | ||
| symbol: String, | ||
| } | ||
|
|
||
| #[derive(Debug, Clone, Serialize, Deserialize)] | ||
| struct CoinGeckoTokenList(Vec<CoinGeckoTokenInfo>); | ||
|
|
||
| #[derive(Debug, Clone, Serialize, Deserialize)] | ||
| struct CoinGeckoTokenPrice( | ||
| pub i64, // timestamp (milliseconds) | ||
| #[serde(with = "UnsignedRatioSerializeAsDecimal")] pub Ratio<BigUint>, // price | ||
| ); | ||
|
|
||
| #[derive(Debug, Clone, Serialize, Deserialize)] | ||
| struct CoinGeckoMarketChart { | ||
| prices: Vec<CoinGeckoTokenPrice>, | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn test_coingecko_api() { | ||
| let mut runtime = tokio::runtime::Builder::new() | ||
| .basic_scheduler() | ||
| .enable_all() | ||
| .build() | ||
| .expect("tokio runtime"); | ||
| let client = reqwest::Client::new(); | ||
| let api = CoinGeckoAPI::new(client).expect("coingecko init"); | ||
| runtime | ||
| .block_on(api.get_price("ETH")) | ||
| .expect("Failed to get data from ticker"); | ||
| } | ||
| } |
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