ethers-rs/ethers-contract/tests/contract.rs

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use ethers_contract::ContractFactory;
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use ethers_core::{
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abi::{Detokenize, InvalidOutputType, Token},
types::{Address, H256},
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utils::{Ganache, Solc},
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};
use ethers_providers::{Http, Provider};
use ethers_signers::Wallet;
use std::convert::TryFrom;
#[tokio::test]
async fn deploy_and_call_contract() {
// compile the contract
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let compiled = Solc::new("./tests/contract.sol").build().unwrap();
let contract = compiled
.get("SimpleStorage")
.expect("could not find contract");
// launch ganache
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let port = 8546u64;
let url = format!("http://localhost:{}", port).to_string();
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let _ganache = Ganache::new().port(port)
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.mnemonic("abstract vacuum mammal awkward pudding scene penalty purchase dinner depart evoke puzzle")
.spawn();
// connect to the network
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let provider = Provider::<Http>::try_from(url.as_str()).unwrap();
// instantiate our wallets
let [wallet1, wallet2]: [Wallet; 2] = [
"380eb0f3d505f087e438eca80bc4df9a7faa24f868e69fc0440261a0fc0567dc"
.parse()
.unwrap(),
"cc96601bc52293b53c4736a12af9130abf347669b3813f9ec4cafdf6991b087e"
.parse()
.unwrap(),
];
// Instantiate the clients. We assume that clients consume the provider and the wallet
// (which makes sense), so for multi-client tests, you must clone the provider.
let client = wallet1.connect(provider.clone());
let client2 = wallet2.connect(provider);
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// create a factory which will be used to deploy instances of the contract
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let factory = ContractFactory::new(&contract.abi, &contract.bytecode, &client);
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// `send` consumes the deployer so it must be cloned for later re-use
// (practically it's not expected that you'll need to deploy multiple instances of
// the _same_ deployer, so it's fine to clone here from a dev UX vs perf tradeoff)
let deployer = factory.deploy("initial value".to_string()).unwrap();
let contract = deployer.clone().send().await.unwrap();
let get_value = contract.method::<_, String>("getValue", ()).unwrap();
let last_sender = contract.method::<_, Address>("lastSender", ()).unwrap();
// the initial value must be the one set in the constructor
let value = get_value.clone().call().await.unwrap();
assert_eq!(value, "initial value");
// make a call with `client2`
let _tx_hash = contract
.connect(&client2)
.method::<_, H256>("setValue", "hi".to_owned())
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.unwrap()
.send()
.await
.unwrap();
assert_eq!(last_sender.clone().call().await.unwrap(), client2.address());
assert_eq!(get_value.clone().call().await.unwrap(), "hi");
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// we can also call contract methods at other addresses with the `at` call
// (useful when interacting with multiple ERC20s for example)
let contract2_addr = deployer.clone().send().await.unwrap().address();
let contract2 = contract.at(contract2_addr);
let init_value: String = contract2
.method::<_, String>("getValue", ())
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.unwrap()
.call()
.await
.unwrap();
let init_address = contract2
.method::<_, Address>("lastSender", ())
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.unwrap()
.call()
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.await
.unwrap();
assert_eq!(init_address, Address::zero());
assert_eq!(init_value, "initial value");
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// we can still interact with the old contract instance
let _tx_hash = contract
.method::<_, H256>("setValue", "hi2".to_owned())
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.unwrap()
.send()
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.await
.unwrap();
assert_eq!(last_sender.clone().call().await.unwrap(), client.address());
assert_eq!(get_value.clone().call().await.unwrap(), "hi2");
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// and we can fetch the events
let logs: Vec<ValueChanged> = contract
.event("ValueChanged")
.unwrap()
.from_block(0u64)
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.topic1(client.address()) // Corresponds to the first indexed parameter
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.query()
.await
.unwrap();
assert_eq!(logs[0].new_value, "initial value");
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assert_eq!(logs[1].new_value, "hi2");
assert_eq!(logs.len(), 2);
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let logs: Vec<ValueChanged> = contract2
.event("ValueChanged")
.unwrap()
.from_block(0u64)
.query()
.await
.unwrap();
assert_eq!(logs[0].new_value, "initial value");
assert_eq!(logs.len(), 1);
}
// Note: We also provide the `abigen` macro for generating these bindings automatically
#[derive(Clone, Debug)]
struct ValueChanged {
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old_author: Address,
new_author: Address,
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old_value: String,
new_value: String,
}
impl Detokenize for ValueChanged {
fn from_tokens(tokens: Vec<Token>) -> Result<ValueChanged, InvalidOutputType> {
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let old_author: Address = tokens[1].clone().to_address().unwrap();
let new_author: Address = tokens[1].clone().to_address().unwrap();
let old_value = tokens[2].clone().to_string().unwrap();
let new_value = tokens[3].clone().to_string().unwrap();
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Ok(Self {
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old_author,
new_author,
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old_value,
new_value,
})
}
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}