import {TxData} from '@0xproject/types';
import {Web3Wrapper} from '@0xproject/web3-wrapper';
import * as _ from 'lodash';
import * as Web3 from 'web3';
import {Contract} from './utils/contract';
import {encoder} from './utils/encoder';
import {fsWrapper} from './utils/fs_wrapper';
import {
ContractArtifact,
ContractData,
DeployerOptions,
} from './utils/types';
import {utils} from './utils/utils';
// Gas added to gas estimate to make sure there is sufficient gas for deployment.
const EXTRA_GAS = 200000;
export class Deployer {
public web3Wrapper: Web3Wrapper;
private artifactsDir: string;
private jsonrpcPort: number;
private networkId: number;
private defaults: Partial<TxData>;
constructor(opts: DeployerOptions) {
this.artifactsDir = opts.artifactsDir;
this.jsonrpcPort = opts.jsonrpcPort;
this.networkId = opts.networkId;
const jsonrpcUrl = `http://localhost:${this.jsonrpcPort}`;
const web3Provider = new Web3.providers.HttpProvider(jsonrpcUrl);
this.defaults = opts.defaults;
this.web3Wrapper = new Web3Wrapper(web3Provider, this.defaults);
}
/**
* Loads contract artifact and deploys contract with given arguments.
* @param contractName Name of the contract to deploy. Must match name of an artifact in artifacts directory.
* @param args Array of contract constructor arguments.
* @return Deployed contract instance.
*/
public async deployAsync(contractName: string, args: any[] = []): Promise<Web3.ContractInstance> {
const contractArtifact: ContractArtifact = this.loadContractArtifactIfExists(contractName);
const contractData: ContractData = this.getContractDataFromArtifactIfExists(contractArtifact);
const data = contractData.unlinked_binary;
const from = await this.getFromAddressAsync();
const gas = await this.getAllowableGasEstimateAsync(data);
const txData = {
gasPrice: this.defaults.gasPrice,
from,
data,
gas,
};
const abi = contractData.abi;
const web3ContractInstance = await this.deployFromAbiAsync(abi, args, txData);
utils.consoleLog(`${contractName}.sol successfully deployed at ${web3ContractInstance.address}`);
const contractInstance = new Contract(web3ContractInstance, this.defaults);
return contractInstance;
}
/**
* Loads contract artifact, deploys with given arguments, and saves updated data to artifact.
* @param contractName Name of the contract to deploy. Must match name of an artifact in artifacts directory.
* @param args Array of contract constructor arguments.
* @return Deployed contract instance.
*/
public async deployAndSaveAsync(contractName: string, args: any[] = []): Promise<Web3.ContractInstance> {
const contractInstance = await this.deployAsync(contractName, args);
await this.saveContractDataToArtifactAsync(contractName, contractInstance.address, args);
return contractInstance;
}
/**
* Deploys a contract given its ABI, arguments, and transaction data.
* @param abi ABI of contract to deploy.
* @param args Constructor arguments to use in deployment.
* @param txData Tx options used for deployment.
* @return Promise that resolves to a web3 contract instance.
*/
private async deployFromAbiAsync(abi: Web3.ContractAbi, args: any[], txData: Web3.TxData): Promise<any> {
const contract: Web3.Contract<Web3.ContractInstance> = this.web3Wrapper.getContractFromAbi(abi);
const deployPromise = new Promise((resolve, reject) => {
/**
* Contract is inferred as 'any' because TypeScript
* is not able to read 'new' from the Contract interface
*/
(contract as any).new(...args, txData, (err: Error, res: any): any => {
if (err) {
reject(err);
} else if (_.isUndefined(res.address) && !_.isUndefined(res.transactionHash)) {
utils.consoleLog(`transactionHash: ${res.transactionHash}`);
} else {
resolve(res);
}
});
});
return deployPromise;
}
/**
* Updates a contract artifact's address and encoded constructor arguments.
* @param contractName Name of contract. Must match an existing artifact.
* @param contractAddress Contract address to save to artifact.
* @param args Contract constructor arguments that will be encoded and saved to artifact.
*/
private async saveContractDataToArtifactAsync(contractName: string,
contractAddress: string, args: any[]): Promise<void> {
const contractArtifact: ContractArtifact = this.loadContractArtifactIfExists(contractName);
const contractData: ContractData = this.getContractDataFromArtifactIfExists(contractArtifact);
const abi = contractData.abi;
const encodedConstructorArgs = encoder.encodeConstructorArgsFromAbi(args, abi);
const newContractData = {
...contractData,
address: contractAddress,
constructor_args: encodedConstructorArgs,
};
const newArtifact = {
...contractArtifact,
networks: {
...contractArtifact.networks,
[this.networkId]: newContractData,
},
};
const artifactString = utils.stringifyWithFormatting(newArtifact);
const artifactPath = `${this.artifactsDir}/${contractName}.json`;
await fsWrapper.writeFileAsync(artifactPath, artifactString);
}
/**
* Loads a contract artifact, if it exists.
* @param contractName Name of the contract, without the extension.
* @return The contract artifact.
*/
private loadContractArtifactIfExists(contractName: string): ContractArtifact {
const artifactPath = `${this.artifactsDir}/${contractName}.json`;
try {
const contractArtifact: ContractArtifact = require(artifactPath);
return contractArtifact;
} catch (err) {
throw new Error(`Artifact not found for contract: ${contractName}`);
}
}
/**
* Gets data for current networkId stored in artifact.
* @param contractArtifact The contract artifact.
* @return Network specific contract data.
*/
private getContractDataFromArtifactIfExists(contractArtifact: ContractArtifact): ContractData {
const contractData = contractArtifact.networks[this.networkId];
if (_.isUndefined(contractData)) {
throw new Error(`Data not found in artifact for contract: ${contractArtifact.contract_name}`);
}
return contractData;
}
/**
* Gets the address to use for sending a transaction.
* @return The default from address. If not specified, returns the first address accessible by web3.
*/
private async getFromAddressAsync(): Promise<string> {
let from: string;
if (_.isUndefined(this.defaults.from)) {
const accounts = await this.web3Wrapper.getAvailableAddressesAsync();
from = accounts[0];
} else {
from = this.defaults.from;
}
return from;
}
/**
* Estimates the gas required for a transaction.
* If gas would be over the block gas limit, the max allowable gas is returned instead.
* @param data Bytecode to estimate gas for.
* @return Gas estimate for transaction data.
*/
private async getAllowableGasEstimateAsync(data: string): Promise<number> {
const block = await this.web3Wrapper.getBlockAsync('latest');
let gas: number;
try {
const gasEstimate: number = await this.web3Wrapper.estimateGasAsync(data);
gas = Math.min(gasEstimate + EXTRA_GAS, block.gasLimit);
} catch (err) {
gas = block.gasLimit;
}
return gas;
}
}
