From fe975945d1a2d24a4611369c229fcb9fafa8d196 Mon Sep 17 00:00:00 2001
From: Thomas Kaul <4159106+dtslvr@users.noreply.github.com>
Date: Tue, 24 Aug 2021 21:09:02 +0200
Subject: [PATCH] Feature/add fallback for loading currencies (#315)

* Add fallback for loading currencies

* Update changelog
---
 CHANGELOG.md                                  |  1 +
 .../services/exchange-rate-data.service.ts    | 20 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b28db8ee1..4d53b537b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Extended the data management of symbol profile data by countries (automated for stocks)
+- Added a fallback for initially loading currencies if historical data is not yet available
 
 ## 1.42.0 - 22.08.2021
 
diff --git a/apps/api/src/services/exchange-rate-data.service.ts b/apps/api/src/services/exchange-rate-data.service.ts
index afb6ea122..a2617647f 100644
--- a/apps/api/src/services/exchange-rate-data.service.ts
+++ b/apps/api/src/services/exchange-rate-data.service.ts
@@ -3,7 +3,7 @@ import { DATE_FORMAT, getYesterday } from '@ghostfolio/common/helper';
 import { Injectable } from '@nestjs/common';
 import { Currency } from '@prisma/client';
 import { format } from 'date-fns';
-import { isNumber } from 'lodash';
+import { isEmpty, isNumber } from 'lodash';
 
 import { DataProviderService } from './data-provider/data-provider.service';
 
@@ -35,6 +35,24 @@ export class ExchangeRateDataService {
       getYesterday()
     );
 
+    if (isEmpty(result)) {
+      // Load currencies directly from data provider as a fallback
+      // if historical data is not yet available
+      const historicalData = await this.dataProviderService.get(
+        this.currencyPairs.map((currencyPair) => {
+          return currencyPair;
+        })
+      );
+
+      Object.keys(historicalData).forEach((key) => {
+        result[key] = {
+          [format(getYesterday(), DATE_FORMAT)]: {
+            marketPrice: historicalData[key].marketPrice
+          }
+        };
+      });
+    }
+
     const resultExtended = result;
 
     Object.keys(result).forEach((pair) => {