Deployed Contract Wrapper

Wrappers

One of the advancements of the etherlime is the result of the deployment

  • the DeployedContractWrapper

The DeployedContractWrapper is a powerful object that provides you with ethers.Contract amongst other functionalities. This allows you to start using your deployed contract right away as part of your deployment sequence (f.e. you can call initialization methods)

In addition it exposes you verboseWaitForTransaction(transaction, transactionLabel) function. This function can be used to wait for transaction to be mined while giving you verbose output of the state. In addition it allows you to specify a label for the transaction you are waiting for, so that you can get a better understanding of what transaction is being waited for. This comes in handy when deployment scripts start to grow.

const contractWrapper = await deployer.deploy(ICOTokenContract);
const transferTransaction = await contractWrapper.transferOwnership(randomAddress);
const result = await contractWrapper.verboseWaitForTransaction(transferTransaction,
'Transfer Ownership');

Тhe address of the contract can be accessed by contractWrapper.contractAddress. It has also utils property that gives you the option to get easy the contract's balance.

let balance = await contractWrapper.utils.getBalance();

If you are working with EtherlimeGanacheDeployer you will have the from method at your disposal. It will allow you to call certain methods from other default accounts.

const deployer = new etherlime.EtherlimeGanacheDeployer();
const contractWrapper = await deployer.deploy(SomeContract);
const tx = await contractWrapper
.from(0 /* could be string address or ethers.Wallet instance*/).someFunction(params);
const result = await contractWrapper.verboseWaitForTransaction(tx);

Working with previously deployed contracts

Sometimes you want to work with already deployed contract. You can do this two ways:

etherlime.ContractAt

etherlime.ContractAt(contract, contractAddress, [signer], [providerOrPort])

Etherlime has a convenience method allowing you to quickly wrap contracts. Passing the contract descriptor and the address it is deployed ContractAt will wire up an instance of the wrapper connected to etherlime ganache on the default port and default account. Optionally you can provide an account and port to connect to etherlime ganache. Alternatively if you want to connect to another provider you can pass it as last parameter, but then you must pass a signer too which is already connected to the same provider.

const deployedContract = etherlime.ContractAt(ContractDescriptor,
deployedContractAddress);
const tx = await deployedContract.someMethod(randomParam);
const result = await deployedContract.verboseWaitForTransaction(tx);

The deployer instance

The deployer object allows you to wrap such an deployed contract by it's address and continue using the power of the wrapper object. The function you can use to achieve this is wrapDeployedContract(contract, contractAddress).

const deployedContractWrapper = deployer
.wrapDeployedContract(SomeContractWithInitMethod, alreadyDeployedContractAddress);
const initTransaction = await deployedContractWrapper.init(randomParam, defaultConfigs);
const result = await deployedContractWrapper.verboseWaitForTransaction(initTransaction,
'Init Contract');