ethers-rs/examples/providers/examples/retry.rs

37 lines
1.3 KiB
Rust

//! The RetryClient is a type that wraps around a JsonRpcClient and automatically retries failed
//! requests using an exponential backoff and filtering based on a RetryPolicy. It presents as a
//! JsonRpcClient, but with additional functionality for retrying requests.
//!
//! The RetryPolicy can be customized for specific applications and endpoints, mainly to handle
//! rate-limiting errors. In addition to the RetryPolicy, errors caused by connectivity issues such
//! as timed out connections or responses in the 5xx range can also be retried separately.
use ethers::prelude::*;
use reqwest::Url;
use std::time::Duration;
const RPC_URL: &str = "https://eth.llamarpc.com";
#[tokio::main]
async fn main() -> eyre::Result<()> {
let provider = Http::new(Url::parse(RPC_URL)?);
let client = RetryClientBuilder::default()
.rate_limit_retries(10)
.timeout_retries(3)
.initial_backoff(Duration::from_millis(500))
.build(provider, Box::<ethers::providers::HttpRateLimitRetryPolicy>::default());
// Send a JSON-RPC request for the latest block
let block_num = "latest".to_string();
let txn_details = false;
let params = (block_num, txn_details);
let block: Block<H256> =
JsonRpcClient::request(&client, "eth_getBlockByNumber", params).await?;
println!("{block:?}");
Ok(())
}