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import { BigNumber } from '@0xproject/utils';
import * as _ from 'lodash';
import { AbstractBalanceAndProxyAllowanceFetcher } from '../abstract/abstract_balance_and_proxy_allowance_fetcher';
import { AbstractBalanceAndProxyAllowanceLazyStore } from '../abstract/abstract_balance_and_proxy_allowance_lazy_store';
/**
* Copy on read store for balances/proxyAllowances of tokens/accounts
*/
export class BalanceAndProxyAllowanceLazyStore implements AbstractBalanceAndProxyAllowanceLazyStore {
private readonly _balanceAndProxyAllowanceFetcher: AbstractBalanceAndProxyAllowanceFetcher;
private _balance: {
[assetData: string]: {
[userAddress: string]: BigNumber;
};
};
private _proxyAllowance: {
[assetData: string]: {
[userAddress: string]: BigNumber;
};
};
constructor(balanceAndProxyAllowanceFetcher: AbstractBalanceAndProxyAllowanceFetcher) {
this._balanceAndProxyAllowanceFetcher = balanceAndProxyAllowanceFetcher;
this._balance = {};
this._proxyAllowance = {};
}
public async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
if (_.isUndefined(this._balance[assetData]) || _.isUndefined(this._balance[assetData][userAddress])) {
const balance = await this._balanceAndProxyAllowanceFetcher.getBalanceAsync(assetData, userAddress);
this.setBalance(assetData, userAddress, balance);
}
const cachedBalance = this._balance[assetData][userAddress];
return cachedBalance;
}
public setBalance(assetData: string, userAddress: string, balance: BigNumber): void {
if (_.isUndefined(this._balance[assetData])) {
this._balance[assetData] = {};
}
this._balance[assetData][userAddress] = balance;
}
public deleteBalance(assetData: string, userAddress: string): void {
if (!_.isUndefined(this._balance[assetData])) {
delete this._balance[assetData][userAddress];
if (_.isEmpty(this._balance[assetData])) {
delete this._balance[assetData];
}
}
}
public async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
if (
_.isUndefined(this._proxyAllowance[assetData]) ||
_.isUndefined(this._proxyAllowance[assetData][userAddress])
) {
const proxyAllowance = await this._balanceAndProxyAllowanceFetcher.getProxyAllowanceAsync(
assetData,
userAddress,
);
this.setProxyAllowance(assetData, userAddress, proxyAllowance);
}
const cachedProxyAllowance = this._proxyAllowance[assetData][userAddress];
return cachedProxyAllowance;
}
public setProxyAllowance(assetData: string, userAddress: string, proxyAllowance: BigNumber): void {
if (_.isUndefined(this._proxyAllowance[assetData])) {
this._proxyAllowance[assetData] = {};
}
this._proxyAllowance[assetData][userAddress] = proxyAllowance;
}
public deleteProxyAllowance(assetData: string, userAddress: string): void {
if (!_.isUndefined(this._proxyAllowance[assetData])) {
delete this._proxyAllowance[assetData][userAddress];
if (_.isEmpty(this._proxyAllowance[assetData])) {
delete this._proxyAllowance[assetData];
}
}
}
public deleteAll(): void {
this._balance = {};
this._proxyAllowance = {};
}
}
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