90 lines
2.8 KiB
Rust
90 lines
2.8 KiB
Rust
#![cfg(not(target_arch = "wasm32"))]
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use std::convert::TryFrom;
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use async_trait::async_trait;
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use ethers_core::{types::*, utils::Ganache};
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use ethers_middleware::gas_oracle::{
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EthGasStation, Etherchain, Etherscan, GasCategory, GasOracle, GasOracleError,
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GasOracleMiddleware,
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};
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use ethers_providers::{Http, Middleware, Provider};
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use serial_test::serial;
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#[derive(Debug)]
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struct FakeGasOracle {
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gas_price: U256,
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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 FakeGasOracle {
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async fn fetch(&self) -> Result<U256, GasOracleError> {
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Ok(self.gas_price)
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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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#[tokio::test]
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async fn using_gas_oracle() {
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let ganache = Ganache::new().spawn();
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let from = ganache.addresses()[0];
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// connect to the network
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let provider = Provider::<Http>::try_from(ganache.endpoint()).unwrap();
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// this is set because ganache now sets 875000000 as the first block's base fee
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let base_fee = 875000000;
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// assign a gas oracle to use
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let gas_oracle = FakeGasOracle { gas_price: (base_fee + 1337).into() };
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let expected_gas_price = gas_oracle.fetch().await.unwrap();
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let provider = GasOracleMiddleware::new(provider, gas_oracle);
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// broadcast a transaction
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let tx = TransactionRequest::new().from(from).to(Address::zero()).value(10000);
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let tx_hash = provider.send_transaction(tx, None).await.unwrap();
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let tx = provider.get_transaction(*tx_hash).await.unwrap().unwrap();
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assert_eq!(tx.gas_price, Some(expected_gas_price));
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}
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#[tokio::test]
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async fn eth_gas_station() {
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// initialize and fetch gas estimates from EthGasStation
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let eth_gas_station_oracle = EthGasStation::default();
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let data = eth_gas_station_oracle.fetch().await;
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assert!(data.is_ok());
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}
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#[tokio::test]
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#[serial]
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async fn etherscan() {
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let etherscan_client = ethers_etherscan::Client::new_from_env(Chain::Mainnet).unwrap();
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// initialize and fetch gas estimates from Etherscan
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// since etherscan does not support `fastest` category, we expect an error
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let etherscan_oracle = Etherscan::new(etherscan_client.clone()).category(GasCategory::Fastest);
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let data = etherscan_oracle.fetch().await;
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assert!(data.is_err());
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// 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;
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assert!(data.is_ok());
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}
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#[tokio::test]
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async fn etherchain() {
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// initialize and fetch gas estimates from Etherchain
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let etherchain_oracle = Etherchain::default().category(GasCategory::Fast);
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let data = etherchain_oracle.fetch().await;
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assert!(data.is_ok());
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}
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