86 lines
3.2 KiB
Rust
86 lines
3.2 KiB
Rust
use ethers::{
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core::types::Chain,
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etherscan::Client,
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middleware::gas_oracle::{
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BlockNative, Etherscan, GasCategory, GasNow, GasOracle, Polygon, ProviderOracle,
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},
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providers::{Http, Provider},
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};
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/// In Ethereum, the "gas" of a transaction refers to the amount of computation required to execute
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/// the transaction on the blockchain. Gas is typically measured in units of "gas," and the cost of
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/// a transaction is determined by the amount of gas it consumes.
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///
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/// A "gas oracle" is a tool or service that provides information about the current price of gas on
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/// the Ethereum network. Gas oracles are often used to help determine the appropriate amount of gas
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/// to include in a transaction, in order to ensure that it will be processed in a timely manner
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/// without running out of gas.
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///
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/// Ethers-rs includes a feature called "gas oracle middleware" that allows you to customize the
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/// behavior of the library when it comes to determining the gas cost of transactions.
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#[tokio::main]
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async fn main() {
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blocknative().await;
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etherscan().await;
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gas_now().await;
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polygon().await;
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provider_oracle().await;
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//etherchain().await; // FIXME: Etherchain URL is broken (Http 404)
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}
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async fn blocknative() {
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let api_key: Option<String> = std::env::var("BLOCK_NATIVE_API_KEY").ok();
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let oracle = BlockNative::new(api_key).category(GasCategory::Fastest);
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match oracle.fetch().await {
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Ok(gas_price) => println!("[Blocknative]: Gas price is {gas_price:?}"),
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Err(e) => panic!("[Blocknative]: Cannot estimate gas: {e:?}"),
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}
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}
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async fn etherscan() {
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let client = Client::new_from_opt_env(Chain::Mainnet).unwrap();
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let oracle = Etherscan::new(client).category(GasCategory::Fast);
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match oracle.fetch().await {
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Ok(gas_price) => println!("[Etherscan]: Gas price is {gas_price:?}"),
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Err(e) => panic!("[Etherscan]: Cannot estimate gas: {e:?}"),
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}
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}
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async fn gas_now() {
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let oracle = GasNow::new().category(GasCategory::Fast);
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match oracle.fetch().await {
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Ok(gas_price) => println!("[GasNow]: Gas price is {gas_price:?}"),
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Err(e) => panic!("[GasNow]: Cannot estimate gas: {e:?}"),
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}
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}
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async fn polygon() {
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let chain = Chain::Polygon;
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if let Ok(oracle) = Polygon::new(chain) {
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match oracle.category(GasCategory::SafeLow).fetch().await {
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Ok(gas_price) => println!("[Polygon]: Gas price is {gas_price:?}"),
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Err(e) => panic!("[Polygon]: Cannot estimate gas: {e:?}"),
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}
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}
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}
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async fn provider_oracle() {
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const RPC_URL: &str = "https://eth.llamarpc.com";
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let provider = Provider::<Http>::try_from(RPC_URL).unwrap();
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let oracle = ProviderOracle::new(provider);
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match oracle.fetch().await {
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Ok(gas_price) => println!("[Provider oracle]: Gas price is {gas_price:?}"),
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Err(e) => panic!("[Provider oracle]: Cannot estimate gas: {e:?}"),
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}
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}
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/*
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// FIXME: Etherchain URL is broken (Http 404)
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async fn etherchain() {
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let oracle = Etherchain::new().category(GasCategory::Standard);
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match oracle.fetch().await {
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Ok(gas_price) => println!("[Etherchain]: Gas price is {gas_price:?}"),
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Err(e) => panic!("[Etherchain]: Cannot estimate gas: {e:?}"),
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}
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}*/
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