92 lines
3.1 KiB
Rust
92 lines
3.1 KiB
Rust
use crate::gas_oracle::{GasCategory, GasOracle, GasOracleError};
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use async_trait::async_trait;
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use ethers_core::types::{u256_from_f64_saturating, Chain, 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 GAS_PRICE_ENDPOINT: &str = "https://gasstation-mainnet.matic.network/v2";
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const MUMBAI_GAS_PRICE_ENDPOINT: &str = "https://gasstation-mumbai.matic.today/v2";
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/// The [Polygon](https://docs.polygon.technology/docs/develop/tools/polygon-gas-station/) gas station API
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/// Queries over HTTP and implements the `GasOracle` trait
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#[derive(Clone, Debug)]
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pub struct Polygon {
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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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/// The response from the Polygon gas station API.
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/// Gas prices are in Gwei.
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#[derive(Debug, Deserialize, PartialEq)]
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#[serde(rename_all = "camelCase")]
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pub struct Response {
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estimated_base_fee: f64,
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safe_low: GasEstimate,
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standard: GasEstimate,
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fast: GasEstimate,
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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 GasEstimate {
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max_priority_fee: f64,
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max_fee: f64,
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}
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impl Polygon {
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pub fn new(chain: Chain) -> Result<Self, GasOracleError> {
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Self::with_client(Client::new(), chain)
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}
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pub fn with_client(client: Client, chain: Chain) -> Result<Self, GasOracleError> {
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// TODO: Sniff chain from chain id.
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let url = match chain {
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Chain::Polygon => Url::parse(GAS_PRICE_ENDPOINT).unwrap(),
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Chain::PolygonMumbai => Url::parse(MUMBAI_GAS_PRICE_ENDPOINT).unwrap(),
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_ => return Err(GasOracleError::UnsupportedChain),
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};
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Ok(Self { 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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/// Perform request to Blocknative, decode response
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pub async fn request(&self) -> Result<(f64, GasEstimate), GasOracleError> {
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let response: Response =
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self.client.get(self.url.as_ref()).send().await?.error_for_status()?.json().await?;
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let estimate = match self.gas_category {
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GasCategory::SafeLow => response.safe_low,
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GasCategory::Standard => response.standard,
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GasCategory::Fast => response.fast,
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GasCategory::Fastest => response.fast,
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};
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Ok((response.estimated_base_fee, estimate))
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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 Polygon {
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async fn fetch(&self) -> Result<U256, GasOracleError> {
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let (base_fee, estimate) = self.request().await?;
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let fee = base_fee + estimate.max_priority_fee;
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Ok(from_gwei(fee))
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}
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async fn estimate_eip1559_fees(&self) -> Result<(U256, U256), GasOracleError> {
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let (_, estimate) = self.request().await?;
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Ok((from_gwei(estimate.max_fee), from_gwei(estimate.max_priority_fee)))
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}
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}
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fn from_gwei(gwei: f64) -> U256 {
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u256_from_f64_saturating(gwei * 1.0e9_f64)
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}
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