optimize fetching from multiple data sources

apps/api/src/services/data-provider.service.ts

@@ -133,56 +133,15 @@ export class DataProviderService implements DataProviderInterface {
     } = {};
 
     for (const { dataSource, symbol } of aDataGatheringItems) {
-      switch (dataSource) {
-        case DataSource.ALPHA_VANTAGE: {
-          if (this.configurationService.get('ALPHA_VANTAGE_API_KEY')) {
-            const data = await this.alphaVantageService.getHistorical(
-              [symbol],
-              undefined,
-              from,
-              to
-            );
-            result[symbol] = data?.[symbol];
-          }
-          break;
-        }
-        case DataSource.GHOSTFOLIO: {
-          if (isGhostfolioScraperApiSymbol(symbol)) {
-            const data = await this.ghostfolioScraperApiService.getHistorical(
-              [symbol],
-              undefined,
-              from,
-              to
-            );
-            result[symbol] = data?.[symbol];
-          }
-          break;
-        }
-        case DataSource.RAKUTEN: {
-          if (
-            isRakutenRapidApiSymbol(symbol) &&
-            this.configurationService.get('RAKUTEN_RAPID_API_KEY')
-          ) {
-            const data = await this.rakutenRapidApiService.getHistorical(
-              [symbol],
-              undefined,
-              from,
-              to
-            );
-            result[symbol] = data?.[symbol];
-          }
-          break;
-        }
-        case DataSource.YAHOO: {
-          const data = await this.yahooFinanceService.getHistorical(
-            [symbol],
-            undefined,
-            from,
-            to
-          );
-          result[symbol] = data?.[symbol];
-          break;
-        }
+      const dataProvider = this.getDataProvider(dataSource);
+      if (dataProvider.hasHistoricalData(symbol)) {
+        const data = await dataProvider.getHistorical(
+          [symbol],
+          undefined,
+          from,
+          to
+        );
+        result[symbol] = data?.[symbol];
       }
     }
 
@@ -190,15 +149,21 @@ export class DataProviderService implements DataProviderInterface {
   }
 
   public async search(aSymbol: string) {
-    return this.getDataProvider().search(aSymbol);
+    return this.getDataProvider(
+      this.configurationService.get('DATA_SOURCES')[0]
+    ).search(aSymbol);
   }
 
-  private getDataProvider() {
-    switch (this.configurationService.get('DATA_SOURCES')[0]) {
+  private getDataProvider(providerName: DataSource) {
+    switch (providerName) {
       case DataSource.ALPHA_VANTAGE:
         return this.alphaVantageService;
       case DataSource.YAHOO:
         return this.yahooFinanceService;
+      case DataSource.RAKUTEN:
+        return this.rakutenRapidApiService;
+      case DataSource.GHOSTFOLIO:
+        return this.ghostfolioScraperApiService;
       default:
         throw new Error('No data provider has been found.');
     }

apps/api/src/services/data-provider/alpha-vantage/alpha-vantage.service.ts

@@ -24,6 +24,10 @@ export class AlphaVantageService implements DataProviderInterface {
     });
   }
 
+  public hasHistoricalData(symbol: string) {
+    return this.configurationService.get('ALPHA_VANTAGE_API_KEY');
+  }
+
   public async get(
     aSymbols: string[]
   ): Promise<{ [symbol: string]: IDataProviderResponse }> {

apps/api/src/services/data-provider/ghostfolio-scraper-api/ghostfolio-scraper-api.service.ts

@@ -1,4 +1,7 @@
-import { getYesterday } from '@ghostfolio/common/helper';
+import {
+  getYesterday,
+  isGhostfolioScraperApiSymbol
+} from '@ghostfolio/common/helper';
 import { Granularity } from '@ghostfolio/common/types';
 import { Injectable } from '@nestjs/common';
 import { DataSource } from '@prisma/client';
@@ -21,6 +24,10 @@ export class GhostfolioScraperApiService implements DataProviderInterface {
 
   public constructor(private prisma: PrismaService) {}
 
+  public hasHistoricalData(symbol: string) {
+    return isGhostfolioScraperApiSymbol(symbol);
+  }
+
   public async get(
     aSymbols: string[]
   ): Promise<{ [symbol: string]: IDataProviderResponse }> {

apps/api/src/services/data-provider/rakuten-rapid-api/rakuten-rapid-api.service.ts

@@ -1,4 +1,8 @@
-import { getToday, getYesterday } from '@ghostfolio/common/helper';
+import {
+  getToday,
+  getYesterday,
+  isRakutenRapidApiSymbol
+} from '@ghostfolio/common/helper';
 import { Granularity } from '@ghostfolio/common/types';
 import { Injectable } from '@nestjs/common';
 import { DataSource } from '@prisma/client';
@@ -54,6 +58,13 @@ export class RakutenRapidApiService implements DataProviderInterface {
     return {};
   }
 
+  public hasHistoricalData(symbol: string) {
+    return (
+      isRakutenRapidApiSymbol(symbol) &&
+      this.configurationService.get('RAKUTEN_RAPID_API_KEY')
+    );
+  }
+
   public async getHistorical(
     aSymbols: string[],
     aGranularity: Granularity = 'day',

apps/api/src/services/data-provider/yahoo-finance/yahoo-finance.service.ts

@@ -90,6 +90,10 @@ export class YahooFinanceService implements DataProviderInterface {
     }
   }
 
+  public hasHistoricalData(symbol: string) {
+    return true;
+  }
+
   public async getHistorical(
     aSymbols: string[],
     aGranularity: Granularity = 'day',

apps/api/src/services/interfaces/data-provider.interface.ts

@@ -7,6 +7,8 @@ import {
 } from './interfaces';
 
 export interface DataProviderInterface {
+  hasHistoricalData(symbol: string): boolean;
+
   get(aSymbols: string[]): Promise<{ [symbol: string]: IDataProviderResponse }>;
 
   getHistorical(