Refactor aggregated provider; Fix export

src/exchange/index.ts

@@ -8,3 +8,8 @@ export { InMemoryOrderBookProvider } from './orderBookProvider/index';
 export type { ExchangeSymbolsProvider, ManagedExchangeSymbolsProvider } from './exchangeSymbolsProvider/index';
 export type { OrderBookProvider, ManagedOrderBookProvider } from './orderBookProvider/index';
 export type { ExchangeService, ExchangeServiceEvents } from './exchangeService';
+
+export {
+  type RatesProvider, type AggregatedRatesProvider,
+  BinanceRatesProvider, KrakenRatesProvider, MixedRatesProvider,
+} from './ratesProvider/index';

src/exchange/ratesProvider/aggregatedRatesProvider.ts

@@ -4,4 +4,5 @@ import type { Currency } from '../../common';
 
 export interface AggregatedRatesProvider {
   getPrice(quoteCurrency: Currency['id'], baseCurrency: Currency['id'], provider?: string): Promise<BigNumber | undefined>;
+  getAvailableProviders(): string[];
 }

src/exchange/ratesProvider/mixedRatesProvider/mixedRatesProvider.ts

@@ -10,7 +10,7 @@ export class MixedRatesProvider implements AggregatedRatesProvider {
   ) { }
 
   async getPrice(quoteCurrency: Currency['id'], baseCurrency: Currency['id'], provider?: string): Promise<BigNumber | undefined> {
-    const providers = this.getAvailableProviders(provider);
+    const providers = this.getSelectedProviders(provider);
     const pricePromises = providers.map(p => p.getPrice(quoteCurrency, baseCurrency));
     const pricePromiseResults = await Promise.allSettled(pricePromises);
 
@@ -21,7 +21,11 @@ export class MixedRatesProvider implements AggregatedRatesProvider {
     return undefined;
   }
 
-  private getAvailableProviders(provider?: string): RatesProvider[] {
+  getAvailableProviders(): string[] {
+    return [...this.providersMap.keys()];
+  }
+
+  private getSelectedProviders(provider?: string): RatesProvider[] {
     if (!provider)
       return [...this.providersMap.values()];