import { assert } from '@0xproject/assert';
import { AbiDecoder, addressUtils, BigNumber, intervalUtils, promisify } from '@0xproject/utils';
import {
BlockParam,
BlockParamLiteral,
BlockWithoutTransactionData,
BlockWithTransactionData,
CallData,
ContractAbi,
FilterObject,
JSONRPCRequestPayload,
JSONRPCResponsePayload,
LogEntry,
Provider,
RawLogEntry,
TraceParams,
TransactionReceipt,
TransactionReceiptWithDecodedLogs,
TransactionTrace,
TxData,
} from 'ethereum-types';
import * as _ from 'lodash';
import { marshaller } from './marshaller';
import {
BlockWithoutTransactionDataRPC,
BlockWithTransactionDataRPC,
TransactionRPC,
Web3WrapperErrors,
} from './types';
import { utils } from './utils';
const BASE_TEN = 10;
// These are unique identifiers contained in the response of the
// web3_clientVersion call.
export const uniqueVersionIds = {
geth: 'Geth',
ganache: 'EthereumJS TestRPC',
};
// NodeType represents the type of the backing Ethereum node.
export enum NodeType {
Geth = 'GETH',
Ganache = 'GANACHE',
}
/**
* An alternative to the Web3.js library that provides a consistent, clean, promise-based interface.
*/
export class Web3Wrapper {
/**
* Flag to check if this instance is of type Web3Wrapper
*/
public isZeroExWeb3Wrapper = true;
public abiDecoder: AbiDecoder;
private _provider: Provider;
private _txDefaults: Partial<TxData>;
private _jsonRpcRequestId: number;
/**
* Check if an address is a valid Ethereum address
* @param address Address to check
* @returns Whether the address is a valid Ethereum address
*/
public static isAddress(address: string): boolean {
return addressUtils.isAddress(address);
}
/**
* A unit amount is defined as the amount of a token above the specified decimal places (integer part).
* E.g: If a currency has 18 decimal places, 1e18 or one quintillion of the currency is equivalent
* to 1 unit.
* @param amount The amount in baseUnits that you would like converted to units.
* @param decimals The number of decimal places the unit amount has.
* @return The amount in units.
*/
public static toUnitAmount(amount: BigNumber, decimals: number): BigNumber {
assert.isValidBaseUnitAmount('amount', amount);
assert.isNumber('decimals', decimals);
const aUnit = new BigNumber(BASE_TEN).pow(decimals);
const unit = amount.div(aUnit);
return unit;
}
/**
* A baseUnit is defined as the smallest denomination of a token. An amount expressed in baseUnits
* is the amount expressed in the smallest denomination.
* E.g: 1 unit of a token with 18 decimal places is expressed in baseUnits as 1000000000000000000
* @param amount The amount of units that you would like converted to baseUnits.
* @param decimals The number of decimal places the unit amount has.
* @return The amount in baseUnits.
*/
public static toBaseUnitAmount(amount: BigNumber, decimals: number): BigNumber {
assert.isBigNumber('amount', amount);
assert.isNumber('decimals', decimals);
const unit = new BigNumber(BASE_TEN).pow(decimals);
const baseUnitAmount = amount.times(unit);
const hasDecimals = baseUnitAmount.decimalPlaces() !== 0;
if (hasDecimals) {
throw new Error(`Invalid unit amount: ${amount.toString()} - Too many decimal places`);
}
return baseUnitAmount;
}
/**
* Convert an Ether amount from ETH to Wei
* @param ethAmount Amount of Ether to convert to wei
* @returns Amount in wei
*/
public static toWei(ethAmount: BigNumber): BigNumber {
assert.isBigNumber('ethAmount', ethAmount);
const ETH_DECIMALS = 18;
const balanceWei = Web3Wrapper.toBaseUnitAmount(ethAmount, ETH_DECIMALS);
return balanceWei;
}
private static _assertBlockParam(blockParam: string | BlockParam): void {
if (_.isNumber(blockParam)) {
return;
} else if (_.isString(blockParam)) {
assert.doesBelongToStringEnum('blockParam', blockParam, BlockParamLiteral);
}
}
private static _assertBlockParamOrString(blockParam: string | BlockParam): void {
try {
Web3Wrapper._assertBlockParam(blockParam);
} catch (err) {
try {
assert.isHexString('blockParam', blockParam as string);
return;
} catch (err) {
throw new Error(`Expected blockParam to be of type "string | BlockParam", encountered ${blockParam}`);
}
}
}
private static _normalizeTxReceiptStatus(status: undefined | null | string | 0 | 1): null | 0 | 1 {
// Transaction status might have four values
// undefined - Testrpc and other old clients
// null - New clients on old transactions
// number - Parity
// hex - Geth
if (_.isString(status)) {
return utils.convertHexToNumber(status) as 0 | 1;
} else if (_.isUndefined(status)) {
return null;
} else {
return status;
}
}
/**
* 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 txDefaults Override TxData defaults sent with RPC requests to the backing Ethereum node.
* @return An instance of the Web3Wrapper class.
*/
constructor(provider: Provider, txDefaults?: Partial<TxData>) {
assert.isWeb3Provider('provider', provider);
if (_.isUndefined((provider as any).sendAsync)) {
// Web3@1.0 provider doesn't support synchronous http requests,
// so it only has an async `send` method, instead of a `send` and `sendAsync` in web3@0.x.x`
// We re-assign the send method so that Web3@1.0 providers work with @0xproject/web3-wrapper
(provider as any).sendAsync = (provider as any).send;
}
this.abiDecoder = new AbiDecoder([]);
this._provider = provider;
this._txDefaults = txDefaults || {};
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._txDefaults;
}
/**
* Retrieve the Web3 provider
* @return Web3 provider instance
*/
public getProvider(): Provider {
return this._provider;
}
/**
* Update the used Web3 provider
* @param provider The new Web3 provider to be set
*/
public setProvider(provider: Provider): void {
assert.isWeb3Provider('provider', provider);
this._provider = provider;
}
/**
* 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> {
assert.isETHAddressHex('senderAddress', senderAddress);
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 this._sendRawPayloadAsync<string>({ method: 'web3_clientVersion' });
return nodeVersion;
}
/**
* Fetches the networkId of the backing Ethereum node
* @returns The network id
*/
public async getNetworkIdAsync(): Promise<number> {
const networkIdStr = await this._sendRawPayloadAsync<string>({ method: 'net_version' });
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> {
assert.isHexString('txHash', txHash);
const transactionReceipt = await this._sendRawPayloadAsync<TransactionReceipt>({
method: 'eth_getTransactionReceipt',
params: [txHash],
});
if (!_.isNull(transactionReceipt)) {
transactionReceipt.status = Web3Wrapper._normalizeTxReceiptStatus(transactionReceipt.status);
}
return transactionReceipt;
}
/**
* 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> {
assert.isETHAddressHex('owner', owner);
const balanceInWei = await this._sendRawPayloadAsync<string>({
method: 'eth_getBalance',
params: [owner],
});
// Rewrap in a new BigNumber
return new BigNumber(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> {
assert.isETHAddressHex('address', address);
const code = await this.getContractCodeAsync(address);
// Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
const isCodeEmpty = /^0x0{0,40}$/i.test(code);
return !isCodeEmpty;
}
/**
* Gets the contract code by address
* @param address Address of the contract
* @param defaultBlock Block height at which to make the call. Defaults to `latest`
* @return Code of the contract
*/
public async getContractCodeAsync(address: string, defaultBlock?: BlockParam): Promise<string> {
assert.isETHAddressHex('address', address);
if (!_.isUndefined(defaultBlock)) {
Web3Wrapper._assertBlockParam(defaultBlock);
}
const marshalledDefaultBlock = marshaller.marshalBlockParam(defaultBlock);
const encodedAddress = marshaller.marshalAddress(address);
const code = await this._sendRawPayloadAsync<string>({
method: 'eth_getCode',
params: [encodedAddress, marshalledDefaultBlock],
});
return code;
}
/**
* Gets the debug trace of a transaction
* @param txHash Hash of the transactuon to get a trace for
* @param traceParams Config object allowing you to specify if you need memory/storage/stack traces.
* @return Transaction trace
*/
public async getTransactionTraceAsync(txHash: string, traceParams: TraceParams): Promise<TransactionTrace> {
assert.isHexString('txHash', txHash);
const trace = await this._sendRawPayloadAsync<TransactionTrace>({
method: 'debug_traceTransaction',
params: [txHash, traceParams],
});
return trace;
}
/**
* 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> {
assert.isETHAddressHex('address', address);
assert.isETHAddressHex('address', address);
assert.isString('message', message); // TODO: Should this be stricter? Hex string?
const signData = await this._sendRawPayloadAsync<string>({
method: 'eth_sign',
params: [address, message],
});
return signData;
}
/**
* Fetches the latest block number
* @returns Block number
*/
public async getBlockNumberAsync(): Promise<number> {
const blockNumberHex = await this._sendRawPayloadAsync<string>({
method: 'eth_blockNumber',
params: [],
});
const blockNumber = utils.convertHexToNumberOrNull(blockNumberHex);
return blockNumber as number;
}
/**
* Fetch a specific Ethereum block without transaction data
* @param blockParam The block you wish to fetch (blockHash, blockNumber or blockLiteral)
* @returns The requested block without transaction data
*/
public async getBlockAsync(blockParam: string | BlockParam): Promise<BlockWithoutTransactionData> {
Web3Wrapper._assertBlockParamOrString(blockParam);
const encodedBlockParam = marshaller.marshalBlockParam(blockParam);
const method = utils.isHexStrict(blockParam) ? 'eth_getBlockByHash' : 'eth_getBlockByNumber';
const shouldIncludeTransactionData = false;
const blockWithoutTransactionDataWithHexValues = await this._sendRawPayloadAsync<
BlockWithoutTransactionDataRPC
>({
method,
params: [encodedBlockParam, shouldIncludeTransactionData],
});
const blockWithoutTransactionData = marshaller.unmarshalIntoBlockWithoutTransactionData(
blockWithoutTransactionDataWithHexValues,
);
return blockWithoutTransactionData;
}
/**
* Fetch a specific Ethereum block with transaction data
* @param blockParam The block you wish to fetch (blockHash, blockNumber or blockLiteral)
* @returns The requested block with transaction data
*/
public async getBlockWithTransactionDataAsync(blockParam: string | BlockParam): Promise<BlockWithTransactionData> {
Web3Wrapper._assertBlockParamOrString(blockParam);
let encodedBlockParam = blockParam;
if (_.isNumber(blockParam)) {
encodedBlockParam = utils.numberToHex(blockParam);
}
const method = utils.isHexStrict(blockParam) ? 'eth_getBlockByHash' : 'eth_getBlockByNumber';
const shouldIncludeTransactionData = true;
const blockWithTransactionDataWithHexValues = await this._sendRawPayloadAsync<BlockWithTransactionDataRPC>({
method,
params: [encodedBlockParam, shouldIncludeTransactionData],
});
const blockWithoutTransactionData = marshaller.unmarshalIntoBlockWithTransactionData(
blockWithTransactionDataWithHexValues,
);
return blockWithoutTransactionData;
}
/**
* 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 | BlockParam): Promise<number> {
Web3Wrapper._assertBlockParamOrString(blockParam);
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 this._sendRawPayloadAsync<string>({
method: 'eth_accounts',
params: [],
});
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> {
assert.isNumber('snapshotId', snapshotId);
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 or Geth local node.
* Will throw if provider is neither TestRPC/Ganache or Geth.
* @param timeDelta Amount of time to add in seconds
*/
public async increaseTimeAsync(timeDelta: number): Promise<number> {
assert.isNumber('timeDelta', timeDelta);
// Detect Geth vs. Ganache and use appropriate endpoint.
const version = await this.getNodeVersionAsync();
if (_.includes(version, uniqueVersionIds.geth)) {
return this._sendRawPayloadAsync<number>({ method: 'debug_increaseTime', params: [timeDelta] });
} else if (_.includes(version, uniqueVersionIds.ganache)) {
return this._sendRawPayloadAsync<number>({ method: 'evm_increaseTime', params: [timeDelta] });
} else {
throw new Error(`Unknown client version: ${version}`);
}
}
/**
* 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: FilterObject): Promise<LogEntry[]> {
let fromBlock = filter.fromBlock;
if (_.isNumber(fromBlock)) {
fromBlock = utils.numberToHex(fromBlock);
}
let toBlock = filter.toBlock;
if (_.isNumber(toBlock)) {
toBlock = utils.numberToHex(toBlock);
}
const serializedFilter = {
...filter,
fromBlock,
toBlock,
};
const payload = {
method: 'eth_getLogs',
params: [serializedFilter],
};
const rawLogs = await this._sendRawPayloadAsync<RawLogEntry[]>(payload);
const formattedLogs = _.map(rawLogs, marshaller.unmarshalLog.bind(marshaller));
return formattedLogs;
}
/**
* Calculate the estimated gas cost for a given transaction
* @param txData Transaction data
* @returns Estimated gas cost
*/
public async estimateGasAsync(txData: Partial<TxData>): Promise<number> {
const txDataHex = marshaller.marshalTxData(txData);
const gasHex = await this._sendRawPayloadAsync<string>({ method: 'eth_estimateGas', params: [txDataHex] });
const gas = utils.convertHexToNumber(gasHex);
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: CallData, defaultBlock?: BlockParam): Promise<string> {
if (!_.isUndefined(defaultBlock)) {
Web3Wrapper._assertBlockParam(defaultBlock);
}
const marshalledDefaultBlock = marshaller.marshalBlockParam(defaultBlock);
const callDataHex = marshaller.marshalCallData(callData);
const rawCallResult = await this._sendRawPayloadAsync<string>({
method: 'eth_call',
params: [callDataHex, marshalledDefaultBlock],
});
if (rawCallResult === '0x') {
throw new Error('Contract call failed (returned null)');
}
return rawCallResult;
}
/**
* Send a transaction
* @param txData Transaction data
* @returns Transaction hash
*/
public async sendTransactionAsync(txData: TxData): Promise<string> {
const txDataHex = marshaller.marshalTxData(txData);
const txHash = await this._sendRawPayloadAsync<string>({ method: 'eth_sendTransaction', params: [txDataHex] });
return txHash;
}
/**
* Waits for a transaction to be mined and returns the transaction receipt.
* Note that just because a transaction was mined does not mean it was
* successful. You need to check the status code of the transaction receipt
* to find out if it was successful, or use the helper method
* awaitTransactionSuccessAsync.
* @param txHash Transaction hash
* @param pollingIntervalMs How often (in ms) should we check if the transaction is mined.
* @param timeoutMs How long (in ms) to poll for transaction mined until aborting.
* @return Transaction receipt with decoded log args.
*/
public async awaitTransactionMinedAsync(
txHash: string,
pollingIntervalMs: number = 1000,
timeoutMs?: number,
): Promise<TransactionReceiptWithDecodedLogs> {
assert.isHexString('txHash', txHash);
assert.isNumber('pollingIntervalMs', pollingIntervalMs);
if (!_.isUndefined(timeoutMs)) {
assert.isNumber('timeoutMs', timeoutMs);
}
// Immediately check if the transaction has already been mined.
let transactionReceipt = await this.getTransactionReceiptAsync(txHash);
if (!_.isNull(transactionReceipt)) {
const logsWithDecodedArgs = _.map(
transactionReceipt.logs,
this.abiDecoder.tryToDecodeLogOrNoop.bind(this.abiDecoder),
);
const transactionReceiptWithDecodedLogArgs: TransactionReceiptWithDecodedLogs = {
...transactionReceipt,
logs: logsWithDecodedArgs,
};
return transactionReceiptWithDecodedLogArgs;
}
// Otherwise, check again every pollingIntervalMs.
let wasTimeoutExceeded = false;
if (timeoutMs) {
setTimeout(() => (wasTimeoutExceeded = true), timeoutMs);
}
const txReceiptPromise = new Promise(
(resolve: (receipt: TransactionReceiptWithDecodedLogs) => void, reject) => {
const intervalId = intervalUtils.setAsyncExcludingInterval(
async () => {
if (wasTimeoutExceeded) {
intervalUtils.clearAsyncExcludingInterval(intervalId);
return reject(Web3WrapperErrors.TransactionMiningTimeout);
}
transactionReceipt = await this.getTransactionReceiptAsync(txHash);
if (!_.isNull(transactionReceipt)) {
intervalUtils.clearAsyncExcludingInterval(intervalId);
const logsWithDecodedArgs = _.map(
transactionReceipt.logs,
this.abiDecoder.tryToDecodeLogOrNoop.bind(this.abiDecoder),
);
const transactionReceiptWithDecodedLogArgs: TransactionReceiptWithDecodedLogs = {
...transactionReceipt,
logs: logsWithDecodedArgs,
};
resolve(transactionReceiptWithDecodedLogArgs);
}
},
pollingIntervalMs,
(err: Error) => {
intervalUtils.clearAsyncExcludingInterval(intervalId);
reject(err);
},
);
},
);
const txReceipt = await txReceiptPromise;
return txReceipt;
}
/**
* Waits for a transaction to be mined and returns the transaction receipt.
* Unlike awaitTransactionMinedAsync, it will throw if the receipt has a
* status that is not equal to 1. A status of 0 or null indicates that the
* transaction was mined, but failed. See:
* https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgettransactionreceipt
* @param txHash Transaction hash
* @param pollingIntervalMs How often (in ms) should we check if the transaction is mined.
* @param timeoutMs How long (in ms) to poll for transaction mined until aborting.
* @return Transaction receipt with decoded log args.
*/
public async awaitTransactionSuccessAsync(
txHash: string,
pollingIntervalMs: number = 1000,
timeoutMs?: number,
): Promise<TransactionReceiptWithDecodedLogs> {
const receipt = await this.awaitTransactionMinedAsync(txHash, pollingIntervalMs, timeoutMs);
if (receipt.status !== 1) {
throw new Error(`Transaction failed: ${txHash}`);
}
return receipt;
}
/**
* Calls the 'debug_setHead' JSON RPC method, which sets the current head of
* the local chain by block number. Note, this is a destructive action and
* may severely damage your chain. Use with extreme caution. As of now, this
* is only supported by Geth. It sill throw if the 'debug_setHead' method is
* not supported.
* @param blockNumber The block number to reset to.
*/
public async setHeadAsync(blockNumber: number): Promise<void> {
assert.isNumber('blockNumber', blockNumber);
await this._sendRawPayloadAsync<void>({ method: 'debug_setHead', params: [utils.numberToHex(blockNumber)] });
}
/**
* Returns either NodeType.Geth or NodeType.Ganache depending on the type of
* the backing Ethereum node. Throws for any other type of node.
*/
public async getNodeTypeAsync(): Promise<NodeType> {
const version = await this.getNodeVersionAsync();
if (_.includes(version, uniqueVersionIds.geth)) {
return NodeType.Geth;
} else if (_.includes(version, uniqueVersionIds.ganache)) {
return NodeType.Ganache;
} else {
throw new Error(`Unknown client version: ${version}`);
}
}
private async _sendRawPayloadAsync<A>(payload: Partial<JSONRPCRequestPayload>): Promise<A> {
const sendAsync = this._provider.sendAsync.bind(this._provider);
const payloadWithDefaults = {
id: this._jsonRpcRequestId++,
params: [],
jsonrpc: '2.0',
...payload,
};
const response = await promisify<JSONRPCResponsePayload>(sendAsync)(payloadWithDefaults);
const result = response.result;
return result;
}
} // tslint:disable-line:max-file-line-count
