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use std::str::FromStr;
use web3::{
ethabi::ethereum_types::U256,
signing::SecretKey,
types::{Address, TransactionParameters},
};
/// Below generates and signs a transaction offline, before transmitting it to a public node (eg Infura)
/// For sending a transaction to a local node that stores private keys (eg Ganache) see transaction_private
#[tokio::main]
async fn main() -> web3::Result {
// Sign up at infura > choose the desired network (eg Rinkeby) > copy the endpoint url into the below
// If you need test ether use a faucet, eg https://faucet.rinkeby.io/
let transport = web3::transports::Http::new("https://rinkeby.infura.io/v3/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")?;
let web3 = web3::Web3::new(transport);
// Insert the 20-byte "to" address in hex format (prefix with 0x)
let to = Address::from_str("0xXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX").unwrap();
// Insert the 32-byte private key in hex format (do NOT prefix with 0x)
let prvk = SecretKey::from_str("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX").unwrap();
// Build the tx object
let tx_object = TransactionParameters {
to: Some(to),
value: U256::exp10(17), //0.1 eth
..Default::default()
};
// Sign the tx (can be done offline)
let signed = web3.accounts().sign_transaction(tx_object, &prvk).await?;
// Send the tx to infura
let result = web3.eth().send_raw_transaction(signed.raw_transaction).await?;
println!("Tx succeeded with hash: {}", result);
Ok(())
}