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

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#![cfg(not(target_arch = "wasm32"))]
use ethers_core::{types::*, utils::Ganache};
use ethers_middleware::gas_oracle::{
EthGasStation, Etherchain, Etherscan, GasCategory, GasOracle, GasOracleMiddleware,
};
use ethers_providers::{Http, Middleware, Provider};
use std::convert::TryFrom;
#[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 = EthGasStation::new(None);
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 api_key = std::env::var("ETHERSCAN_API_KEY").unwrap();
let api_key = Some(api_key.as_str());
// initialize and fetch gas estimates from Etherscan
// since etherscan does not support `fastest` category, we expect an error
let etherscan_oracle = Etherscan::new(api_key).category(GasCategory::Fastest);
let data = etherscan_oracle.fetch().await;
assert!(data.is_err());
// but fetching the `standard` gas price should work fine
let etherscan_oracle_2 = Etherscan::new(api_key).category(GasCategory::SafeLow);
let data = etherscan_oracle_2.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());
}