52 lines
1.8 KiB
Rust
52 lines
1.8 KiB
Rust
use async_trait::async_trait;
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use ethers_core::types::U256;
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use ethers_etherscan::Client;
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use crate::gas_oracle::{GasCategory, GasOracle, GasOracleError, GWEI_TO_WEI};
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/// A client over HTTP for the [Etherscan](https://api.etherscan.io/api?module=gastracker&action=gasoracle) 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 Etherscan {
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client: Client,
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gas_category: GasCategory,
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}
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impl Etherscan {
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/// Creates a new [Etherscan](https://etherscan.io/gastracker) gas price oracle.
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pub fn new(client: Client) -> Self {
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Etherscan { client, 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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}
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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 Etherscan {
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async fn fetch(&self) -> Result<U256, GasOracleError> {
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if matches!(self.gas_category, GasCategory::Fastest) {
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return Err(GasOracleError::GasCategoryNotSupported)
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}
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let result = self.client.gas_oracle().await?;
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match self.gas_category {
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GasCategory::SafeLow => Ok(U256::from(result.safe_gas_price * GWEI_TO_WEI)),
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GasCategory::Standard => Ok(U256::from(result.propose_gas_price * GWEI_TO_WEI)),
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GasCategory::Fast => Ok(U256::from(result.fast_gas_price * GWEI_TO_WEI)),
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_ => Err(GasOracleError::GasCategoryNotSupported),
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}
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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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