1 files changed, 181 insertions, 0 deletions
diff --git a/packages/contracts/deploy/src/deployer.ts b/packages/contracts/deploy/src/deployer.ts
new file mode 100644
index 000000000..48d175a42
--- /dev/null
+++ b/packages/contracts/deploy/src/deployer.ts
@@ -0,0 +1,181 @@
+import promisify = require('es6-promisify');
+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';
+import {Web3Wrapper} from './utils/web3_wrapper';
+
+// 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<Web3.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;
+    }
+}