68 lines
2.2 KiB
Rust
68 lines
2.2 KiB
Rust
#![cfg(not(target_arch = "wasm32"))]
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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, GasOracleMiddleware,
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};
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use ethers_providers::{Http, Middleware, Provider};
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use std::convert::TryFrom;
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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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// assign a gas oracle to use
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let gas_oracle = EthGasStation::new(None);
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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()
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.from(from)
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.to(Address::zero())
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.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::new(None);
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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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async fn etherscan() {
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let api_key = std::env::var("ETHERSCAN_API_KEY").unwrap();
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let api_key = Some(api_key.as_str());
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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(api_key).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_2 = Etherscan::new(api_key).category(GasCategory::SafeLow);
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let data = etherscan_oracle_2.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::new().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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