82 lines
2.5 KiB
Rust
82 lines
2.5 KiB
Rust
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, GWEI_TO_WEI};
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const ETHERCHAIN_URL: &str = "https://www.etherchain.org/api/gasPriceOracle";
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/// A client over HTTP for the [Etherchain](https://www.etherchain.org/api/gasPriceOracle) 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 Etherchain {
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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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#[derive(Clone, Debug, Deserialize, PartialEq, PartialOrd)]
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#[serde(rename_all = "camelCase")]
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pub struct EtherchainResponse {
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pub safe_low: f32,
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pub standard: f32,
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pub fast: f32,
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pub fastest: f32,
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pub current_base_fee: f32,
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pub recommended_base_fee: f32,
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}
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impl Etherchain {
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/// Creates a new [Etherchain](https://etherchain.org/tools/gasPriceOracle) gas price oracle.
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pub fn new() -> Self {
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Self::with_client(Client::new())
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}
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/// Same as [`Self::new`] but with a custom [`Client`].
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pub fn with_client(client: Client) -> Self {
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let url = Url::parse(ETHERCHAIN_URL).expect("invalid url");
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Etherchain { client, 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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#[must_use]
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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<EtherchainResponse, GasOracleError> {
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Ok(self.client.get(self.url.as_ref()).send().await?.json::<EtherchainResponse>().await?)
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}
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}
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impl Default for Etherchain {
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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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#[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 Etherchain {
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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.safe_low as u64) * GWEI_TO_WEI),
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GasCategory::Standard => U256::from((res.standard as u64) * GWEI_TO_WEI),
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GasCategory::Fast => U256::from((res.fast as u64) * GWEI_TO_WEI),
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GasCategory::Fastest => U256::from((res.fastest as u64) * GWEI_TO_WEI),
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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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