88 lines
2.6 KiB
Rust
88 lines
2.6 KiB
Rust
use super::{from_gwei_f64, GasCategory, GasOracle, GasOracleError, Result};
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use async_trait::async_trait;
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use ethers_core::types::U256;
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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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const 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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#[must_use]
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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, Copy, Debug, Deserialize, PartialEq)]
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#[serde(rename_all = "camelCase")]
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pub struct Response {
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pub safe_low: f64,
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pub standard: f64,
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pub fast: f64,
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pub fastest: f64,
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pub current_base_fee: f64,
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pub recommended_base_fee: f64,
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}
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impl Response {
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#[inline]
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pub fn gas_from_category(&self, gas_category: GasCategory) -> f64 {
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match gas_category {
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GasCategory::SafeLow => self.safe_low,
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GasCategory::Standard => self.standard,
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GasCategory::Fast => self.fast,
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GasCategory::Fastest => self.fastest,
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}
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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> {
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let res = self.query().await?;
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let gas_price = res.gas_from_category(self.gas_category);
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Ok(from_gwei_f64(gas_price))
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}
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async fn estimate_eip1559_fees(&self) -> Result<(U256, U256)> {
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Err(GasOracleError::Eip1559EstimationNotSupported)
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}
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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(URL).unwrap();
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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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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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/// Perform a request to the gas price API and deserialize the response.
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pub async fn query(&self) -> Result<Response> {
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let response =
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self.client.get(self.url.clone()).send().await?.error_for_status()?.json().await?;
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Ok(response)
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}
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}
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