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-rw-r--r--packages/web3-wrapper/src/index.ts141
1 files changed, 134 insertions, 7 deletions
diff --git a/packages/web3-wrapper/src/index.ts b/packages/web3-wrapper/src/index.ts
index 02d5e4f7b..2ce2580ee 100644
--- a/packages/web3-wrapper/src/index.ts
+++ b/packages/web3-wrapper/src/index.ts
@@ -3,12 +3,24 @@ import { BigNumber, promisify } from '@0xproject/utils';
import * as _ from 'lodash';
import * as Web3 from 'web3';
+/**
+ * A wrapper around the Web3.js 0.x library that provides a consistent, clean promise-based interface.
+ */
export class Web3Wrapper {
- // This is here purely to reliably distinguish it from other objects in runtime (like BigNumber.isBigNumber)
+ /**
+ * Flag to check if this instance is of type Web3Wrapper
+ */
public isZeroExWeb3Wrapper = true;
private _web3: Web3;
private _defaults: Partial<TxData>;
private _jsonRpcRequestId: number;
+ /**
+ * Instantiates a new Web3Wrapper.
+ * @param provider The Web3 provider instance you would like the Web3Wrapper to use for interacting with
+ * the backing Ethereum node.
+ * @param defaults Override TxData defaults sent with RPC requests to the backing Ethereum node.
+ * @return An instance of the Web3Wrapper class.
+ */
constructor(provider: Web3.Provider, defaults?: Partial<TxData>) {
if (_.isUndefined((provider as any).sendAsync)) {
// Web3@1.0 provider doesn't support synchronous http requests,
@@ -21,32 +33,69 @@ export class Web3Wrapper {
this._defaults = defaults || {};
this._jsonRpcRequestId = 0;
}
+ /**
+ * Get the contract defaults set to the Web3Wrapper instance
+ * @return TxData defaults (e.g gas, gasPrice, nonce, etc...)
+ */
public getContractDefaults(): Partial<TxData> {
return this._defaults;
}
+ /**
+ * Retrieve the Web3 provider
+ * @return Web3 provider instance
+ */
public getProvider(): Web3.Provider {
return this._web3.currentProvider;
}
+ /**
+ * Update the used Web3 provider
+ * @param provider The new Web3 provider to be set
+ */
public setProvider(provider: Web3.Provider) {
this._web3.setProvider(provider);
}
+ /**
+ * Check if an address is a valid Ethereum address
+ * @param address Address to check
+ * @returns Whether the address is a valid Ethereum address
+ */
public isAddress(address: string): boolean {
return this._web3.isAddress(address);
}
+ /**
+ * Check whether an address is available through the backing provider. This can be
+ * useful if you want to know whether a user can sign messages or transactions from
+ * a given Ethereum address.
+ * @param senderAddress Address to check availability for
+ * @returns Whether the address is available through the provider.
+ */
public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
const addresses = await this.getAvailableAddressesAsync();
const normalizedAddress = senderAddress.toLowerCase();
return _.includes(addresses, normalizedAddress);
}
+ /**
+ * Fetch the backing Ethereum node's version string (e.g `MetaMask/v4.2.0`)
+ * @returns Ethereum node's version string
+ */
public async getNodeVersionAsync(): Promise<string> {
const nodeVersion = await promisify<string>(this._web3.version.getNode)();
return nodeVersion;
}
+ /**
+ * Fetches the networkId of the backing Ethereum node
+ * @returns The network id
+ */
public async getNetworkIdAsync(): Promise<number> {
const networkIdStr = await promisify<string>(this._web3.version.getNetwork)();
const networkId = _.parseInt(networkIdStr);
return networkId;
}
+ /**
+ * Retrieves the transaction receipt for a given transaction hash
+ * @param txHash Transaction hash
+ * @returns The transaction receipt, including it's status (0: failed, 1: succeeded or undefined: not found)
+ */
public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
const transactionReceipt = await promisify<TransactionReceipt>(this._web3.eth.getTransactionReceipt)(txHash);
if (!_.isNull(transactionReceipt)) {
@@ -54,60 +103,117 @@ export class Web3Wrapper {
}
return transactionReceipt;
}
- public getCurrentProvider(): Web3.Provider {
- return this._web3.currentProvider;
- }
+ /**
+ * Convert an Ether amount from ETH to Wei
+ * @param ethAmount Amount of Ether to convert to wei
+ * @returns Amount in wei
+ */
public toWei(ethAmount: BigNumber): BigNumber {
const balanceWei = this._web3.toWei(ethAmount, 'ether');
return balanceWei;
}
+ /**
+ * Retrieves an accounts Ether balance in wei
+ * @param owner Account whose balance you wish to check
+ * @returns Balance in wei
+ */
public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
let balanceInWei = await promisify<BigNumber>(this._web3.eth.getBalance)(owner);
// Rewrap in a new BigNumber
balanceInWei = new BigNumber(balanceInWei);
return balanceInWei;
}
+ /**
+ * Check if a contract exists at a given address
+ * @param address Address to which to check
+ * @returns Whether or not contract code was found at the supplied address
+ */
public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
const code = await promisify<string>(this._web3.eth.getCode)(address);
// Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
const codeIsEmpty = /^0x0{0,40}$/i.test(code);
return !codeIsEmpty;
}
- public async signTransactionAsync(address: string, message: string): Promise<string> {
+ /**
+ * Sign a message with a specific address's private key (`eth_sign`)
+ * @param address Address of signer
+ * @param message Message to sign
+ * @returns Signature string (might be VRS or RSV depending on the Signer)
+ */
+ public async signMessageAsync(address: string, message: string): Promise<string> {
const signData = await promisify<string>(this._web3.eth.sign)(address, message);
return signData;
}
+ /**
+ * Fetches the latest block number
+ * @returns Block number
+ */
public async getBlockNumberAsync(): Promise<number> {
const blockNumber = await promisify<number>(this._web3.eth.getBlockNumber)();
return blockNumber;
}
+ /**
+ * Fetch a specific Ethereum block
+ * @param blockParam The block you wish to fetch (blockHash, blockNumber or blockLiteral)
+ * @returns The requested block without transaction data
+ */
public async getBlockAsync(blockParam: string | Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
const block = await promisify<Web3.BlockWithoutTransactionData>(this._web3.eth.getBlock)(blockParam);
return block;
}
+ /**
+ * Fetch a block's timestamp
+ * @param blockParam The block you wish to fetch (blockHash, blockNumber or blockLiteral)
+ * @returns The block's timestamp
+ */
public async getBlockTimestampAsync(blockParam: string | Web3.BlockParam): Promise<number> {
const { timestamp } = await this.getBlockAsync(blockParam);
return timestamp;
}
+ /**
+ * Retrieve the user addresses available through the backing provider
+ * @returns Available user addresses
+ */
public async getAvailableAddressesAsync(): Promise<string[]> {
const addresses = await promisify<string[]>(this._web3.eth.getAccounts)();
const normalizedAddresses = _.map(addresses, address => address.toLowerCase());
return normalizedAddresses;
}
+ /**
+ * Take a snapshot of the blockchain state on a TestRPC/Ganache local node
+ * @returns The snapshot id. This can be used to revert to this snapshot
+ */
public async takeSnapshotAsync(): Promise<number> {
const snapshotId = Number(await this._sendRawPayloadAsync<string>({ method: 'evm_snapshot', params: [] }));
return snapshotId;
}
+ /**
+ * Revert the blockchain state to a previous snapshot state on TestRPC/Ganache local node
+ * @param snapshotId snapshot id to revert to
+ * @returns Whether the revert was successful
+ */
public async revertSnapshotAsync(snapshotId: number): Promise<boolean> {
const didRevert = await this._sendRawPayloadAsync<boolean>({ method: 'evm_revert', params: [snapshotId] });
return didRevert;
}
+ /**
+ * Mine a block on a TestRPC/Ganache local node
+ */
public async mineBlockAsync(): Promise<void> {
await this._sendRawPayloadAsync<string>({ method: 'evm_mine', params: [] });
}
+ /**
+ * Increase the next blocks timestamp on TestRPC/Ganache local node
+ * @param timeDelta Amount of time to add in seconds
+ */
public async increaseTimeAsync(timeDelta: number): Promise<void> {
await this._sendRawPayloadAsync<string>({ method: 'evm_increaseTime', params: [timeDelta] });
}
+ /**
+ * Retrieve smart contract logs for a given filter
+ * @param filter Parameters by which to filter which logs to retrieve
+ * @returns The corresponding log entries
+ */
public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
let fromBlock = filter.fromBlock;
if (_.isNumber(fromBlock)) {
@@ -132,18 +238,39 @@ export class Web3Wrapper {
const formattedLogs = _.map(rawLogs, this._formatLog.bind(this));
return formattedLogs;
}
+ /**
+ * Get a Web3 contract factory instance for a given ABI
+ * @param abi Smart contract ABI
+ * @returns Web3 contract factory which can create Web3 Contract instances from the supplied ABI
+ */
public getContractFromAbi(abi: Web3.ContractAbi): Web3.Contract<any> {
const web3Contract = this._web3.eth.contract(abi);
return web3Contract;
}
+ /**
+ * Calculate the estimated gas cost for a given transaction
+ * @param txData Transaction data
+ * @returns Estimated gas cost
+ */
public async estimateGasAsync(txData: Partial<Web3.TxData>): Promise<number> {
const gas = await promisify<number>(this._web3.eth.estimateGas)(txData);
return gas;
}
+ /**
+ * Call a smart contract method at a given block height
+ * @param callData Call data
+ * @param defaultBlock Block height at which to make the call. Defaults to `latest`
+ * @returns The raw call result
+ */
public async callAsync(callData: Web3.CallData, defaultBlock?: Web3.BlockParam): Promise<string> {
- const rawCalllResult = await promisify<string>(this._web3.eth.call)(callData, defaultBlock);
- return rawCalllResult;
+ const rawCallResult = await promisify<string>(this._web3.eth.call)(callData, defaultBlock);
+ return rawCallResult;
}
+ /**
+ * Send a transaction
+ * @param txData Transaction data
+ * @returns Transaction hash
+ */
public async sendTransactionAsync(txData: Web3.TxData): Promise<string> {
const txHash = await promisify<string>(this._web3.eth.sendTransaction)(txData);
return txHash;