ethers-rs/ethers/examples/contract.rs

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use anyhow::Result;
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use ethers::{
prelude::*,
utils::{GanacheBuilder, Solc},
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};
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use std::convert::TryFrom;
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// Generate the contract bindings by providing the ABI
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abigen!(
SimpleContract,
r#"[{"inputs":[{"internalType":"string","name":"value","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"author","type":"address"},{"indexed":false,"internalType":"string","name":"oldValue","type":"string"},{"indexed":false,"internalType":"string","name":"newValue","type":"string"}],"name":"ValueChanged","type":"event"},{"inputs":[],"name":"getValue","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","constant": true, "type":"function"},{"inputs":[{"internalType":"string","name":"value","type":"string"}],"name":"setValue","outputs":[],"stateMutability":"nonpayable","type":"function"}]"#,
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()?;
let contract = compiled
.get("SimpleStorage")
.expect("could not find contract");
// 2. launch ganache
let port = 8546u64;
let url = format!("http://localhost:{}", port).to_string();
let _ganache = GanacheBuilder::new().port(port)
.mnemonic("abstract vacuum mammal awkward pudding scene penalty purchase dinner depart evoke puzzle")
.spawn();
// 3. instantiate our wallet
let wallet = "380eb0f3d505f087e438eca80bc4df9a7faa24f868e69fc0440261a0fc0567dc"
.parse::<MainnetWallet>()?;
// 4. connect to the network
let provider = HttpProvider::try_from(url.as_str())?;
// 5. instantiate the client with the wallet
let client = wallet.connect(&provider);
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// 6. create a factory which will be used to deploy instances of the contract
let factory = ContractFactory::new(&client, &contract.abi, &contract.bytecode);
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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);
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// 10. call the `setValue` method
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let _tx_hash = contract.set_value("hi".to_owned()).send().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(())
}