ethers-rs/ethers/examples/contract_with_abi.rs

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use anyhow::Result;
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use ethers::{
prelude::*,
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utils::{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,
"./ethers/examples/contract_abi.json",
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event_derives(serde::Deserialize, serde::Serialize)
);
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#[tokio::main]
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async fn main() -> Result<()> {
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// 1. compile the contract (note this requires that you are inside the `ethers/examples` directory)
let compiled = Solc::new("**/contract.sol").build()?;
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let contract = compiled
.get("SimpleStorage")
.expect("could not find contract");
dbg!("OK");
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// 2. launch ganache
let ganache = Ganache::new().spawn();
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// 3. instantiate our wallet
let wallet: LocalWallet = ganache.keys()[0].clone().into();
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// 4. connect to the network
let provider =
Provider::<Http>::try_from(ganache.endpoint())?.interval(Duration::from_millis(10u64));
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// 5. instantiate the client with the wallet
let client = SignerMiddleware::new(provider, wallet);
let client = Arc::new(client);
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// 6. 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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// 7. deploy it with the constructor arguments
let contract = factory.deploy("initial value".to_string())?.send().await?;
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// 8. get the contract's address
let addr = contract.address();
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// 9. instantiate the contract
let contract = SimpleContract::new(addr, client.clone());
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// 10. 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?;
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// 11. get all events
let logs = contract
.value_changed_filter()
.from_block(0u64)
.query()
.await?;
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// 12. 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(())
}