ethers-rs/examples/contract_human_readable.rs

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use anyhow::Result;
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use ethers::{
prelude::*,
utils::{compile_and_launch_ganache, Ganache, Solc},
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};
use std::{convert::TryFrom, sync::Arc, time::Duration};
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// Generate the type-safe contract bindings by providing the ABI
// definition in human readable format
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abigen!(
SimpleContract,
r#"[
function setValue(string)
function getValue() external view returns (string)
event ValueChanged(address indexed author, string oldValue, string newValue)
]"#,
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event_derives(serde::Deserialize, serde::Serialize)
);
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#[tokio::main]
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async fn main() -> Result<()> {
// 1. compile the contract (note this requires that you are inside the `examples` directory) and launch ganache
let (compiled, ganache) =
compile_and_launch_ganache(Solc::new("**/contract.sol"), Ganache::new()).await?;
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let contract = compiled
.get("SimpleStorage")
.expect("could not find contract");
// 2. instantiate our wallet
let wallet: LocalWallet = ganache.keys()[0].clone().into();
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// 3. connect to the network
let provider =
Provider::<Http>::try_from(ganache.endpoint())?.interval(Duration::from_millis(10u64));
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// 4. instantiate the client with the wallet
let client = SignerMiddleware::new(provider, wallet);
let client = Arc::new(client);
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// 5. create a factory which will be used to deploy instances of the contract
let factory = ContractFactory::new(
contract.abi.clone(),
contract.bytecode.clone(),
client.clone(),
);
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// 6. deploy it with the constructor arguments
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let contract = factory.deploy("initial value".to_string())?.send().await?;
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// 7. get the contract's address
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let addr = contract.address();
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// 8. instantiate the contract
let contract = SimpleContract::new(addr, client.clone());
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// 9. call the `setValue` method
// (first `await` returns a PendingTransaction, second one waits for it to be mined)
let _receipt = contract.set_value("hi".to_owned()).send().await?.await?;
// 10. get all events
let logs = contract
.value_changed_filter()
.from_block(0u64)
.query()
.await?;
// 11. get the new value
let value = contract.get_value().call().await?;
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println!("Value: {}. Logs: {}", value, serde_json::to_string(&logs)?);
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Ok(())
}