diff options
Diffstat (limited to 'src/utils/exchange_transfer_simulator.ts')
| -rw-r--r-- | src/utils/exchange_transfer_simulator.ts | 76 |
1 files changed, 16 insertions, 60 deletions
diff --git a/src/utils/exchange_transfer_simulator.ts b/src/utils/exchange_transfer_simulator.ts index 89b23c8ab..308ef06db 100644 --- a/src/utils/exchange_transfer_simulator.ts +++ b/src/utils/exchange_transfer_simulator.ts @@ -1,7 +1,8 @@ import * as _ from 'lodash'; import BigNumber from 'bignumber.js'; -import {ExchangeContractErrs, TradeSide, TransferType} from '../types'; +import {ExchangeContractErrs, TradeSide, TransferType, BlockParamLiteral} from '../types'; import {TokenWrapper} from '../contract_wrappers/token_wrapper'; +import {BalanceAndProxyAllowanceLazyStore} from '../stores/balance_proxy_allowance_lazy_store'; enum FailureReason { Balance = 'balance', @@ -31,58 +32,13 @@ const ERR_MSG_MAPPING = { }, }; -/** - * Copy on read store for balances/proxyAllowances of tokens/accounts touched in trades - */ -export class BalanceAndProxyAllowanceLazyStore { - protected _token: TokenWrapper; - private _balance: { - [tokenAddress: string]: { - [userAddress: string]: BigNumber, - }, - }; - private _proxyAllowance: { - [tokenAddress: string]: { - [userAddress: string]: BigNumber, - }, - }; +export class ExchangeTransferSimulator { + private store: BalanceAndProxyAllowanceLazyStore; + private UNLIMITED_ALLOWANCE_IN_BASE_UNITS: BigNumber; constructor(token: TokenWrapper) { - this._token = token; - this._balance = {}; - this._proxyAllowance = {}; - } - protected async getBalanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> { - if (_.isUndefined(this._balance[tokenAddress]) || _.isUndefined(this._balance[tokenAddress][userAddress])) { - const balance = await this._token.getBalanceAsync(tokenAddress, userAddress); - this.setBalance(tokenAddress, userAddress, balance); - } - const cachedBalance = this._balance[tokenAddress][userAddress]; - return cachedBalance; - } - protected setBalance(tokenAddress: string, userAddress: string, balance: BigNumber): void { - if (_.isUndefined(this._balance[tokenAddress])) { - this._balance[tokenAddress] = {}; - } - this._balance[tokenAddress][userAddress] = balance; + this.store = new BalanceAndProxyAllowanceLazyStore(token); + this.UNLIMITED_ALLOWANCE_IN_BASE_UNITS = token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS; } - protected async getProxyAllowanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> { - if (_.isUndefined(this._proxyAllowance[tokenAddress]) || - _.isUndefined(this._proxyAllowance[tokenAddress][userAddress])) { - const proxyAllowance = await this._token.getProxyAllowanceAsync(tokenAddress, userAddress); - this.setProxyAllowance(tokenAddress, userAddress, proxyAllowance); - } - const cachedProxyAllowance = this._proxyAllowance[tokenAddress][userAddress]; - return cachedProxyAllowance; - } - protected setProxyAllowance(tokenAddress: string, userAddress: string, proxyAllowance: BigNumber): void { - if (_.isUndefined(this._proxyAllowance[tokenAddress])) { - this._proxyAllowance[tokenAddress] = {}; - } - this._proxyAllowance[tokenAddress][userAddress] = proxyAllowance; - } -} - -export class ExchangeTransferSimulator extends BalanceAndProxyAllowanceLazyStore { /** * Simulates transferFrom call performed by a proxy * @param tokenAddress Address of the token to be transferred @@ -95,8 +51,8 @@ export class ExchangeTransferSimulator extends BalanceAndProxyAllowanceLazyStore public async transferFromAsync(tokenAddress: string, from: string, to: string, amountInBaseUnits: BigNumber, tradeSide: TradeSide, transferType: TransferType): Promise<void> { - const balance = await this.getBalanceAsync(tokenAddress, from); - const proxyAllowance = await this.getProxyAllowanceAsync(tokenAddress, from); + const balance = await this.store.getBalanceAsync(tokenAddress, from); + const proxyAllowance = await this.store.getProxyAllowanceAsync(tokenAddress, from); if (proxyAllowance.lessThan(amountInBaseUnits)) { this.throwValidationError(FailureReason.ProxyAllowance, tradeSide, transferType); } @@ -109,20 +65,20 @@ export class ExchangeTransferSimulator extends BalanceAndProxyAllowanceLazyStore } private async decreaseProxyAllowanceAsync(tokenAddress: string, userAddress: string, amountInBaseUnits: BigNumber): Promise<void> { - const proxyAllowance = await this.getProxyAllowanceAsync(tokenAddress, userAddress); - if (!proxyAllowance.eq(this._token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS)) { - this.setProxyAllowance(tokenAddress, userAddress, proxyAllowance.minus(amountInBaseUnits)); + const proxyAllowance = await this.store.getProxyAllowanceAsync(tokenAddress, userAddress); + if (!proxyAllowance.eq(this.UNLIMITED_ALLOWANCE_IN_BASE_UNITS)) { + this.store.setProxyAllowance(tokenAddress, userAddress, proxyAllowance.minus(amountInBaseUnits)); } } private async increaseBalanceAsync(tokenAddress: string, userAddress: string, amountInBaseUnits: BigNumber): Promise<void> { - const balance = await this.getBalanceAsync(tokenAddress, userAddress); - this.setBalance(tokenAddress, userAddress, balance.plus(amountInBaseUnits)); + const balance = await this.store.getBalanceAsync(tokenAddress, userAddress); + this.store.setBalance(tokenAddress, userAddress, balance.plus(amountInBaseUnits)); } private async decreaseBalanceAsync(tokenAddress: string, userAddress: string, amountInBaseUnits: BigNumber): Promise<void> { - const balance = await this.getBalanceAsync(tokenAddress, userAddress); - this.setBalance(tokenAddress, userAddress, balance.minus(amountInBaseUnits)); + const balance = await this.store.getBalanceAsync(tokenAddress, userAddress); + this.store.setBalance(tokenAddress, userAddress, balance.minus(amountInBaseUnits)); } private throwValidationError(failureReason: FailureReason, tradeSide: TradeSide, transferType: TransferType): Promise<never> { |