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Lazily instantiate exchangeContract and store as instance variable instead of re-instantiating on every call

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This commit is contained in:
Fabio Berger 2017-05-30 12:27:27 +02:00
parent c536114b16
commit 87491e6741
2 changed files with 17 additions and 3 deletions
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17
src/contract_wrappers/exchange_wrapper.ts
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@ -1,4 +1,5 @@
import * as _ from 'lodash';
import * as Web3 from 'web3';
import {Web3Wrapper} from '../web3_wrapper';
import {ECSignature, ZeroExError, ExchangeContract} from '../types';
import {assert} from '../utils/assert';
@ -7,9 +8,13 @@ import * as ExchangeArtifacts from '../artifacts/Exchange.json';
import {ecSignatureSchema} from '../schemas/ec_signature_schema';
export class ExchangeWrapper extends ContractWrapper {
private exchangeContractIfExists: ExchangeContract;
constructor(web3Wrapper: Web3Wrapper) {
super(web3Wrapper);
}
public invalidateExchangeContract() {
delete this.exchangeContractIfExists;
}
public async isValidSignatureAsync(dataHex: string, ecSignature: ECSignature,
signerAddressHex: string): Promise<boolean> {
assert.isHexString('dataHex', dataHex);
@ -19,10 +24,9 @@ export class ExchangeWrapper extends ContractWrapper {
const senderAddressIfExists = await this.web3Wrapper.getSenderAddressIfExistsAsync();
assert.assert(!_.isUndefined(senderAddressIfExists), ZeroExError.USER_HAS_NO_ASSOCIATED_ADDRESSES);
const contractInstance = await this.instantiateContractIfExistsAsync((ExchangeArtifacts as any));
const exchangeInstance = contractInstance as ExchangeContract;
await this.instantiateExchangeContractIfDoesntExistAsync();
const isValidSignature = await exchangeInstance.isValidSignature.call(
const isValidSignature = await this.exchangeContractIfExists.isValidSignature.call(
signerAddressHex,
dataHex,
ecSignature.v,
@ -34,4 +38,11 @@ export class ExchangeWrapper extends ContractWrapper {
);
return isValidSignature;
}
private async instantiateExchangeContractIfDoesntExistAsync() {
if (!_.isUndefined(this.exchangeContractIfExists)) {
return;
}
const contractInstance = await this.instantiateContractIfExistsAsync((ExchangeArtifacts as any));
this.exchangeContractIfExists = contractInstance as ExchangeContract;
}
}

3
src/types.ts
View File

@ -1,4 +1,5 @@
import * as _ from 'lodash';
import * as Web3 from 'web3';
// Utility function to create a K:V from a list of strings
// Adapted from: https://basarat.gitbooks.io/typescript/content/docs/types/literal-types.html
@ -28,6 +29,8 @@ export interface ECSignature {
export interface ExchangeContract {
isValidSignature: any;
currentProvider: Web3.Provider;
setProvider: (provider: Web3.Provider) => void;
}
export const SolidityTypes = strEnum([