ethers-rs/ethers-middleware/tests/gas_oracle.rs

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#![cfg(not(target_arch = "wasm32"))]
use std::convert::TryFrom;
use async_trait::async_trait;
use ethers_core::{types::*, utils::Ganache};
use ethers_middleware::gas_oracle::{
EthGasStation, Etherchain, Etherscan, GasCategory, GasOracle, GasOracleError,
GasOracleMiddleware,
};
use ethers_providers::{Http, Middleware, Provider};
#[derive(Debug)]
struct FakeGasOracle {
gas_price: U256,
}
#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
impl GasOracle for FakeGasOracle {
async fn fetch(&self) -> Result<U256, GasOracleError> {
Ok(self.gas_price)
}
async fn estimate_eip1559_fees(&self) -> Result<(U256, U256), GasOracleError> {
Err(GasOracleError::Eip1559EstimationNotSupported)
}
}
#[tokio::test]
async fn using_gas_oracle() {
let ganache = Ganache::new().spawn();
let from = ganache.addresses()[0];
// connect to the network
let provider = Provider::<Http>::try_from(ganache.endpoint()).unwrap();
// assign a gas oracle to use
let gas_oracle = FakeGasOracle { gas_price: 1337.into() };
let expected_gas_price = gas_oracle.fetch().await.unwrap();
let provider = GasOracleMiddleware::new(provider, gas_oracle);
// broadcast a transaction
let tx = TransactionRequest::new().from(from).to(Address::zero()).value(10000);
let tx_hash = provider.send_transaction(tx, None).await.unwrap();
let tx = provider.get_transaction(*tx_hash).await.unwrap().unwrap();
assert_eq!(tx.gas_price, Some(expected_gas_price));
}
#[tokio::test]
async fn eth_gas_station() {
// initialize and fetch gas estimates from EthGasStation
let eth_gas_station_oracle = EthGasStation::new(None);
let data = eth_gas_station_oracle.fetch().await;
assert!(data.is_ok());
}
#[tokio::test]
async fn etherscan() {
let etherscan_client = ethers_etherscan::Client::new_from_env(Chain::Mainnet).unwrap();
// initialize and fetch gas estimates from Etherscan
// since etherscan does not support `fastest` category, we expect an error
let etherscan_oracle = Etherscan::new(etherscan_client.clone()).category(GasCategory::Fastest);
let data = etherscan_oracle.fetch().await;
assert!(data.is_err());
// but fetching the `standard` gas price should work fine
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let etherscan_oracle = Etherscan::new(etherscan_client).category(GasCategory::SafeLow);
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let data = etherscan_oracle.fetch().await;
assert!(data.is_ok());
}
#[tokio::test]
async fn etherchain() {
// initialize and fetch gas estimates from Etherchain
let etherchain_oracle = Etherchain::new().category(GasCategory::Fast);
let data = etherchain_oracle.fetch().await;
assert!(data.is_ok());
}