85 lines
2.3 KiB
Rust
85 lines
2.3 KiB
Rust
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use ethers_core::types::U256;
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use async_trait::async_trait;
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use reqwest::Client;
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use serde::Deserialize;
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use url::Url;
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use crate::gas_oracle::{GasCategory, GasOracle, GasOracleError};
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const GAS_NOW_URL: &str = "https://www.gasnow.org/api/v3/gas/price";
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/// A client over HTTP for the [GasNow](https://www.gasnow.org/api/v1/gas/price) gas tracker API
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/// that implements the `GasOracle` trait
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#[derive(Clone, Debug)]
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pub struct GasNow {
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client: Client,
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url: Url,
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gas_category: GasCategory,
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}
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impl Default for GasNow {
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fn default() -> Self {
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Self::new()
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}
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}
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#[derive(Deserialize)]
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struct GasNowResponseWrapper {
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data: GasNowResponse,
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}
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#[derive(Clone, Debug, Deserialize, PartialEq, PartialOrd)]
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pub struct GasNowResponse {
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pub rapid: u64,
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pub fast: u64,
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pub standard: u64,
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pub slow: u64,
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}
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impl GasNow {
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/// Creates a new [GasNow](https://gasnow.org) gas price oracle.
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pub fn new() -> Self {
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let url = Url::parse(GAS_NOW_URL).expect("invalid url");
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Self { client: Client::new(), url, gas_category: GasCategory::Standard }
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}
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/// Sets the gas price category to be used when fetching the gas price.
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pub fn category(mut self, gas_category: GasCategory) -> Self {
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self.gas_category = gas_category;
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self
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}
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pub async fn query(&self) -> Result<GasNowResponse, GasOracleError> {
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let res = self
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.client
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.get(self.url.as_ref())
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.send()
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.await?
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.json::<GasNowResponseWrapper>()
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.await?;
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Ok(res.data)
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}
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}
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#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
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#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
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impl GasOracle for GasNow {
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async fn fetch(&self) -> Result<U256, GasOracleError> {
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let res = self.query().await?;
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let gas_price = match self.gas_category {
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GasCategory::SafeLow => U256::from(res.slow),
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GasCategory::Standard => U256::from(res.standard),
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GasCategory::Fast => U256::from(res.fast),
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GasCategory::Fastest => U256::from(res.rapid),
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};
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Ok(gas_price)
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}
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async fn estimate_eip1559_fees(&self) -> Result<(U256, U256), GasOracleError> {
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Err(GasOracleError::Eip1559EstimationNotSupported)
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}
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}
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