Refactor web3Wrapper to a separate package

17 files changed, 41 insertions, 244 deletions

diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index 0616b3078..1cbfaed0c 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -1,4 +1,5 @@
 import {schemas, SchemaValidator} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as ethUtil from 'ethereumjs-util';
 import * as _ from 'lodash';
@@ -29,7 +30,6 @@ import {intervalUtils} from './utils/interval_utils';
 import {OrderStateUtils} from './utils/order_state_utils';
 import {signatureUtils} from './utils/signature_utils';
 import {utils} from './utils/utils';
-import {Web3Wrapper} from './web3_wrapper';
 
 // Customize our BigNumber instances
 bigNumberConfigs.configure();
diff --git a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
index 5e5a38f8c..0b6fc031a 100644
--- a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import {Block, BlockAndLogStreamer} from 'ethereumjs-blockstream';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -19,7 +20,15 @@ import {AbiDecoder} from '../utils/abi_decoder';
 import {constants} from '../utils/constants';
 import {filterUtils} from '../utils/filter_utils';
 import {intervalUtils} from '../utils/interval_utils';
-import {Web3Wrapper} from '../web3_wrapper';
+
+const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {[contractName: string]: ZeroExError} = {
+    ZRX: ZeroExError.ZRXContractDoesNotExist,
+    EtherToken: ZeroExError.EtherTokenContractDoesNotExist,
+    Token: ZeroExError.TokenContractDoesNotExist,
+    TokenRegistry: ZeroExError.TokenRegistryContractDoesNotExist,
+    TokenTransferProxy: ZeroExError.TokenTransferProxyContractDoesNotExist,
+    Exchange: ZeroExError.ExchangeContractDoesNotExist,
+};
 
 export class ContractWrapper {
     protected _web3Wrapper: Web3Wrapper;
@@ -93,10 +102,24 @@ export class ContractWrapper {
     protected async _instantiateContractIfExistsAsync(
         artifact: Artifact, addressIfExists?: string,
     ): Promise<Web3.ContractInstance> {
-        const web3ContractInstance = await this._web3Wrapper.getContractInstanceFromArtifactAsync(
-            artifact, addressIfExists,
+        let contractAddress: string;
+        if (_.isUndefined(addressIfExists)) {
+            const networkId = this._web3Wrapper.getNetworkId();
+            if (_.isUndefined(artifact.networks[networkId])) {
+                throw new Error(ZeroExError.ContractNotDeployedOnNetwork);
+            }
+            contractAddress = artifact.networks[networkId].address.toLowerCase();
+        } else {
+            contractAddress = addressIfExists;
+        }
+        const doesContractExist = await this._web3Wrapper.doesContractExistAtAddressAsync(contractAddress);
+        if (!doesContractExist) {
+            throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contract_name]);
+        }
+        const contractInstance = this._web3Wrapper.getContractInstance(
+            artifact.abi, contractAddress,
         );
-        return web3ContractInstance;
+        return contractInstance;
     }
     protected _getContractAddress(artifact: Artifact, addressIfExists?: string): string {
         if (_.isUndefined(addressIfExists)) {
diff --git a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
index 26025f6f9..685ae9a9e 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -1,10 +1,10 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
 import {TransactionOpts, ZeroExError} from '../types';
 import {assert} from '../utils/assert';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {EtherTokenContract} from './generated/ether_token';
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index aaf6256a3..433d99e4c 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -1,4 +1,5 @@
 import {schemas} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
@@ -36,7 +37,6 @@ import {decorators} from '../utils/decorators';
 import {ExchangeTransferSimulator} from '../utils/exchange_transfer_simulator';
 import {OrderValidationUtils} from '../utils/order_validation_utils';
 import {utils} from '../utils/utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {ExchangeContract} from './generated/exchange';
diff --git a/packages/0x.js/src/contract_wrappers/generated/ether_token.ts b/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
index eed5e4686..ce3f9f527 100644
--- a/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/ether_token.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/exchange.ts b/packages/0x.js/src/contract_wrappers/generated/exchange.ts
index 8c25ca014..e06ed960c 100644
--- a/packages/0x.js/src/contract_wrappers/generated/exchange.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/exchange.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/token.ts b/packages/0x.js/src/contract_wrappers/generated/token.ts
index 30b06292f..83a4ead34 100644
--- a/packages/0x.js/src/contract_wrappers/generated/token.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/token.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/token_registry.ts b/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
index 6aacc4336..5d9ad9016 100644
--- a/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/token_registry.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts b/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
index 50f1c8f25..fd50a5894 100644
--- a/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
+++ b/packages/0x.js/src/contract_wrappers/generated/token_transfer_proxy.ts
@@ -2,12 +2,12 @@
  * This file is auto-generated using abi-gen. Don't edit directly.
  * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
  */
+import {promisify} from '@0xproject/utils';
 import {BigNumber} from 'bignumber.js';
 import * as Web3 from 'web3';
 
 import {TxData, TxDataPayable} from '../../types';
 import {classUtils} from '../../utils/class_utils';
-import {promisify} from '../../utils/promisify';
 
 import {BaseContract} from './base_contract';
 
diff --git a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
index 27ecb8bde..80b4c0f85 100644
--- a/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_registry_wrapper.ts
@@ -1,10 +1,10 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
 import {Token, TokenMetadata, ZeroExError} from '../types';
 import {assert} from '../utils/assert';
 import {constants} from '../utils/constants';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {TokenRegistryContract} from './generated/token_registry';
diff --git a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
index edc702672..7d6943aea 100644
--- a/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_transfer_proxy_wrapper.ts
@@ -1,8 +1,8 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import {artifacts} from '../artifacts';
 import {ZeroExError} from '../types';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {TokenTransferProxyContract} from './generated/token_transfer_proxy';
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index 630ab6e3b..1ae26edaa 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -1,4 +1,5 @@
 import {schemas} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 
@@ -17,7 +18,6 @@ import {
 import {AbiDecoder} from '../utils/abi_decoder';
 import {assert} from '../utils/assert';
 import {constants} from '../utils/constants';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {ContractWrapper} from './contract_wrapper';
 import {TokenContract} from './generated/token';
diff --git a/packages/0x.js/src/order_watcher/event_watcher.ts b/packages/0x.js/src/order_watcher/event_watcher.ts
index 831f19da5..d5b30d567 100644
--- a/packages/0x.js/src/order_watcher/event_watcher.ts
+++ b/packages/0x.js/src/order_watcher/event_watcher.ts
@@ -1,3 +1,4 @@
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
@@ -11,7 +12,6 @@ import {AbiDecoder} from '../utils/abi_decoder';
 import {assert} from '../utils/assert';
 import {intervalUtils} from '../utils/interval_utils';
 import {utils} from '../utils/utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 const DEFAULT_EVENT_POLLING_INTERVAL_MS = 200;
 
diff --git a/packages/0x.js/src/order_watcher/order_state_watcher.ts b/packages/0x.js/src/order_watcher/order_state_watcher.ts
index 1ce111708..08f52d6e1 100644
--- a/packages/0x.js/src/order_watcher/order_state_watcher.ts
+++ b/packages/0x.js/src/order_watcher/order_state_watcher.ts
@@ -1,4 +1,5 @@
 import {schemas} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import {ZeroEx} from '../0x';
@@ -31,7 +32,6 @@ import {assert} from '../utils/assert';
 import {intervalUtils} from '../utils/interval_utils';
 import {OrderStateUtils} from '../utils/order_state_utils';
 import {utils} from '../utils/utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 import {EventWatcher} from './event_watcher';
 import {ExpirationWatcher} from './expiration_watcher';
diff --git a/packages/0x.js/src/utils/assert.ts b/packages/0x.js/src/utils/assert.ts
index 3cff9d2cf..4cf6caf77 100644
--- a/packages/0x.js/src/utils/assert.ts
+++ b/packages/0x.js/src/utils/assert.ts
@@ -1,12 +1,12 @@
 import {assert as sharedAssert} from '@0xproject/assert';
 import {Schema, SchemaValidator} from '@0xproject/json-schemas';
+import {Web3Wrapper} from '@0xproject/web3-wrapper';
 import BigNumber from 'bignumber.js';
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
 
 import {ECSignature} from '../types';
 import {signatureUtils} from '../utils/signature_utils';
-import {Web3Wrapper} from '../web3_wrapper';
 
 const HEX_REGEX = /^0x[0-9A-F]*$/i;
 
diff --git a/packages/0x.js/src/utils/promisify.ts b/packages/0x.js/src/utils/promisify.ts
deleted file mode 100644
index c114cf32f..000000000
--- a/packages/0x.js/src/utils/promisify.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-import * as _ from 'lodash';
-
-/**
- * Transforms callback-based function -- func(arg1, arg2 .. argN, callback) -- into an ES6-compatible Promise.
- * Promisify provides a default callback of the form (error, result) and rejects when `error` is not null. You can also
- * supply thisArg object as the second argument which will be passed to `apply`.
- */
-export function promisify<T>(
-    originalFn: (
-        ...args: any[],
-        // HACK: This can't be properly typed without variadic kinds https://github.com/Microsoft/TypeScript/issues/5453
-    ) => void,
-    thisArg?: any,
-): (...callArgs: any[]) => Promise<T> {
-    const promisifiedFunction = async (...callArgs: any[]): Promise<T> => {
-        return new Promise<T>((resolve, reject) => {
-            const callback = (err: Error|null, data?: T) => {
-                _.isNull(err) ? resolve(data) : reject(err);
-            };
-            originalFn.apply(thisArg, [...callArgs, callback]);
-        });
-    };
-    return promisifiedFunction;
-}
diff --git a/packages/0x.js/src/web3_wrapper.ts b/packages/0x.js/src/web3_wrapper.ts
deleted file mode 100644
index 6a6b4e760..000000000
--- a/packages/0x.js/src/web3_wrapper.ts
+++ /dev/null
@@ -1,202 +0,0 @@
-import BigNumber from 'bignumber.js';
-import * as _ from 'lodash';
-import * as Web3 from 'web3';
-
-import {Artifact, ArtifactContractName, TransactionReceipt, TxData, ZeroExError} from './types';
-import {promisify} from './utils/promisify';
-
-interface RawLogEntry {
-    logIndex: string|null;
-    transactionIndex: string|null;
-    transactionHash: string;
-    blockHash: string|null;
-    blockNumber: string|null;
-    address: string;
-    data: string;
-    topics: string[];
-}
-
-const CONTRACT_NAME_TO_NOT_FOUND_ERROR: {[contractName: string]: ZeroExError} = {
-    ZRX: ZeroExError.ZRXContractDoesNotExist,
-    EtherToken: ZeroExError.EtherTokenContractDoesNotExist,
-    Token: ZeroExError.TokenContractDoesNotExist,
-    TokenRegistry: ZeroExError.TokenRegistryContractDoesNotExist,
-    TokenTransferProxy: ZeroExError.TokenTransferProxyContractDoesNotExist,
-    Exchange: ZeroExError.ExchangeContractDoesNotExist,
-};
-
-export class Web3Wrapper {
-    private web3: Web3;
-    private networkId: number;
-    private defaults: Partial<TxData>;
-    private jsonRpcRequestId: number;
-    constructor(provider: Web3.Provider, networkId: number, defaults?: Partial<TxData>) {
-        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 0x.js
-            (provider as any).sendAsync = (provider as any).send;
-        }
-        this.web3 = new Web3();
-        this.networkId = networkId;
-        this.web3.setProvider(provider);
-        this.defaults = defaults || {};
-        this.jsonRpcRequestId = 0;
-    }
-    public getContractDefaults(): Partial<TxData> {
-        return this.defaults;
-    }
-    public setProvider(provider: Web3.Provider, networkId: number) {
-        this.networkId = networkId;
-        this.web3.setProvider(provider);
-    }
-    public isAddress(address: string): boolean {
-        return this.web3.isAddress(address);
-    }
-    public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
-        const addresses = await this.getAvailableAddressesAsync();
-        return _.includes(addresses, senderAddress);
-    }
-    public async getNodeVersionAsync(): Promise<string> {
-        const nodeVersion = await promisify<string>(this.web3.version.getNode)();
-        return nodeVersion;
-    }
-    public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
-        const transactionReceipt = await promisify<TransactionReceipt>(this.web3.eth.getTransactionReceipt)(txHash);
-        if (!_.isNull(transactionReceipt)) {
-            transactionReceipt.status = this.normalizeTxReceiptStatus(transactionReceipt.status);
-        }
-        return transactionReceipt;
-    }
-    public getCurrentProvider(): Web3.Provider {
-        return this.web3.currentProvider;
-    }
-    public getNetworkId(): number {
-        return this.networkId;
-    }
-    public async getContractInstanceFromArtifactAsync(
-        artifact: Artifact, address?: string,
-    ): Promise<Web3.ContractInstance> {
-        let contractAddress: string;
-        if (_.isUndefined(address)) {
-            const networkId = this.getNetworkId();
-            if (_.isUndefined(artifact.networks[networkId])) {
-                throw new Error(ZeroExError.ContractNotDeployedOnNetwork);
-            }
-            contractAddress = artifact.networks[networkId].address.toLowerCase();
-        } else {
-            contractAddress = address;
-        }
-        const doesContractExist = await this.doesContractExistAtAddressAsync(contractAddress);
-        if (!doesContractExist) {
-            throw new Error(CONTRACT_NAME_TO_NOT_FOUND_ERROR[artifact.contract_name]);
-        }
-        const contractInstance = this.getContractInstance(
-            artifact.abi, contractAddress,
-        );
-        return contractInstance;
-    }
-    public toWei(ethAmount: BigNumber): BigNumber {
-        const balanceWei = this.web3.toWei(ethAmount, 'ether');
-        return balanceWei;
-    }
-    public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
-        let balanceInWei = await promisify<BigNumber>(this.web3.eth.getBalance)(owner);
-        balanceInWei = new BigNumber(balanceInWei);
-        return balanceInWei;
-    }
-    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> {
-        const signData = await promisify<string>(this.web3.eth.sign)(address, message);
-        return signData;
-    }
-    public async getBlockNumberAsync(): Promise<number> {
-        const blockNumber = await promisify<number>(this.web3.eth.getBlockNumber)();
-        return blockNumber;
-    }
-    public async getBlockAsync(blockParam: string|Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
-        const block = await promisify<Web3.BlockWithoutTransactionData>(this.web3.eth.getBlock)(blockParam);
-        return block;
-    }
-    public async getBlockTimestampAsync(blockParam: string|Web3.BlockParam): Promise<number> {
-        const {timestamp} = await this.getBlockAsync(blockParam);
-        return timestamp;
-    }
-    public async getAvailableAddressesAsync(): Promise<string[]> {
-        const addresses = await promisify<string[]>(this.web3.eth.getAccounts)();
-        return addresses;
-    }
-    public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
-        let fromBlock = filter.fromBlock;
-        if (_.isNumber(fromBlock)) {
-            fromBlock = this.web3.toHex(fromBlock);
-        }
-        let toBlock = filter.toBlock;
-        if (_.isNumber(toBlock)) {
-            toBlock = this.web3.toHex(toBlock);
-        }
-        const serializedFilter = {
-            ...filter,
-            fromBlock,
-            toBlock,
-        };
-        const payload = {
-            jsonrpc: '2.0',
-            id: this.jsonRpcRequestId++,
-            method: 'eth_getLogs',
-            params: [serializedFilter],
-        };
-        const rawLogs = await this.sendRawPayloadAsync<RawLogEntry[]>(payload);
-        const formattedLogs = _.map(rawLogs, this.formatLog.bind(this));
-        return formattedLogs;
-    }
-    private getContractInstance(abi: Web3.ContractAbi, address: string): Web3.ContractInstance {
-        const web3ContractInstance = this.web3.eth.contract(abi).at(address);
-        return web3ContractInstance;
-    }
-    private async getNetworkAsync(): Promise<number> {
-        const networkId = await promisify<number>(this.web3.version.getNetwork)();
-        return networkId;
-    }
-    private async sendRawPayloadAsync<A>(payload: Web3.JSONRPCRequestPayload): Promise<A> {
-        const sendAsync = this.web3.currentProvider.sendAsync.bind(this.web3.currentProvider);
-        const response = await promisify<Web3.JSONRPCResponsePayload>(sendAsync)(payload);
-        const result = response.result;
-        return result;
-    }
-    private 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 this.web3.toDecimal(status) as 0|1;
-        } else if (_.isUndefined(status)) {
-            return null;
-        } else {
-            return status;
-        }
-    }
-    private formatLog(rawLog: RawLogEntry): Web3.LogEntry {
-        const formattedLog = {
-            ...rawLog,
-            logIndex: this.hexToDecimal(rawLog.logIndex),
-            blockNumber: this.hexToDecimal(rawLog.blockNumber),
-            transactionIndex: this.hexToDecimal(rawLog.transactionIndex),
-        };
-        return formattedLog;
-    }
-    private hexToDecimal(hex: string|null): number|null {
-        if (_.isNull(hex)) {
-            return null;
-        }
-        const decimal = this.web3.toDecimal(hex);
-        return decimal;
-    }
-}