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authorFabio Berger <me@fabioberger.com>2017-11-13 11:17:18 +0800
committerFabio Berger <me@fabioberger.com>2017-11-13 11:17:18 +0800
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Switch over to Lerna + Yarn Workspaces setup for a mono-repo approach
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+import * as _ from 'lodash';
+import * as ethABI from 'ethereumjs-abi';
+import * as ethUtil from 'ethereumjs-util';
+import {Order, SignedOrder, SolidityTypes} from '../types';
+import BigNumber from 'bignumber.js';
+import BN = require('bn.js');
+
+export const utils = {
+ /**
+ * Converts BigNumber instance to BN
+ * The only reason we convert to BN is to remain compatible with `ethABI. soliditySHA3` that
+ * expects values of Solidity type `uint` to be passed as type `BN`.
+ * We do not use BN anywhere else in the codebase.
+ */
+ bigNumberToBN(value: BigNumber) {
+ return new BN(value.toString(), 10);
+ },
+ consoleLog(message: string): void {
+ // tslint:disable-next-line: no-console
+ console.log(message);
+ },
+ isParityNode(nodeVersion: string): boolean {
+ return _.includes(nodeVersion, 'Parity');
+ },
+ isTestRpc(nodeVersion: string): boolean {
+ return _.includes(nodeVersion, 'TestRPC');
+ },
+ spawnSwitchErr(name: string, value: any): Error {
+ return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
+ },
+ getOrderHashHex(order: Order|SignedOrder): string {
+ const orderParts = [
+ {value: order.exchangeContractAddress, type: SolidityTypes.Address},
+ {value: order.maker, type: SolidityTypes.Address},
+ {value: order.taker, type: SolidityTypes.Address},
+ {value: order.makerTokenAddress, type: SolidityTypes.Address},
+ {value: order.takerTokenAddress, type: SolidityTypes.Address},
+ {value: order.feeRecipient, type: SolidityTypes.Address},
+ {value: utils.bigNumberToBN(order.makerTokenAmount), type: SolidityTypes.Uint256},
+ {value: utils.bigNumberToBN(order.takerTokenAmount), type: SolidityTypes.Uint256},
+ {value: utils.bigNumberToBN(order.makerFee), type: SolidityTypes.Uint256},
+ {value: utils.bigNumberToBN(order.takerFee), type: SolidityTypes.Uint256},
+ {value: utils.bigNumberToBN(order.expirationUnixTimestampSec), type: SolidityTypes.Uint256},
+ {value: utils.bigNumberToBN(order.salt), type: SolidityTypes.Uint256},
+ ];
+ const types = _.map(orderParts, o => o.type);
+ const values = _.map(orderParts, o => o.value);
+ const hashBuff = ethABI.soliditySHA3(types, values);
+ const hashHex = ethUtil.bufferToHex(hashBuff);
+ return hashHex;
+ },
+ getCurrentUnixTimestamp(): BigNumber {
+ return new BigNumber(Date.now() / 1000);
+ },
+};