//! Example depicting how to make a Batch RPC request using the HTTP provider.

use alloy::{

node_bindings::Anvil,

primitives::{address, U128, U64},

rpc::client::ClientBuilder,

};

use eyre::Result;

#[tokio::main]

async fn main() -> Result<()> {

// Spin up a local Anvil node.

// Ensure `anvil` is available in $PATH.

let anvil = Anvil::new().spawn();

// Swap this out with a RPC_URL provider that supports JSON-RPC batch requests. e.g. https://eth.merkle.io

let rpc_url = anvil.endpoint_url();

// Create a HTTP transport.

let client = ClientBuilder::default().http(rpc_url);

// Instantiate a batch.

let mut batch = client.new_batch();

// Add calls to the batch.

let block_number_fut =

batch.add_call("eth_blockNumber", &())?.map_resp(|resp: U64| resp.to::<u64>());

let gas_price_fut =

batch.add_call("eth_gasPrice", &())?.map_resp(|resp: U128| resp.to::<u128>());

let vitalik = address!("d8da6bf26964af9d7eed9e03e53415d37aa96045");

let vitalik_nonce_fut = batch

.add_call("eth_getTransactionCount", &(vitalik, "latest"))? // Vitalik's nonce at BlockId::Latest

.map_resp(|resp: U128| resp.to::<u128>());

// Send the batch request.

batch.send().await?;

// Get the results.

let (latest_block, gas_price, vitalik_nonce) =

tokio::try_join!(block_number_fut, gas_price_fut, vitalik_nonce_fut)?;

println!("Latest block number: {latest_block}");

println!("Gas price: {gas_price}");

println!("Vitalik's nonce: {vitalik_nonce}");

Ok(())

}