Improve Subscriptions by adding sub. variables and filter

Author: LeoSL

src/graphql/data-source/market-data/index.ts

@@ -3,28 +3,57 @@ import { generateRandomMarketDataResponse } from '../../mock-db'
 import { filterArgsPerTickerPair } from '../../lib/util'
 
 export const fetchMarketData = (
-  args: QueryMarketDataArgs,
+  args?: QueryMarketDataArgs,
 ): Promise<MarketDataResponse> =>
   new Promise((resolve, reject) => {
-    console.log('📚 getMarketData Args', args)
+    if (args == null) {
+      const response = generateRandomMarketDataResponse().marketDataResponse
+        .tradingPairs as MarketDataResponse
+      resolve(response)
+    } else {
+      console.log('📚 fetchMarketData Args', args)
+
+      const { baseTicker, quoteTicker } = args
+
+      const data = generateRandomMarketDataResponse().marketDataResponse
+        .tradingPairs
 
-    const { baseTicker, quoteTicker } = args
+      const response = filterArgsPerTickerPair(
+        `${baseTicker}-${quoteTicker}`,
+        data,
+      )
 
-    const data = generateRandomMarketDataResponse().marketDataResponse
-      .tradingPairs
+      if (data == null || data.length === 0) {
+        console.error('❌ Error: Ticket Pair not found', args)
+
+        reject({
+          marketDataResponse: undefined,
+        })
+      } else {
+        resolve(response as MarketDataResponse)
+      }
+    }
+  })
+
+export const fetchMarketDataSubscription = (
+  displaySymbol: string,
+): Promise<MarketDataResponse> =>
+  new Promise((resolve, reject) => {
+    console.log('📚 fetchMarketDataSubscription Args', displaySymbol)
 
-    const response = filterArgsPerTickerPair(
-      `${baseTicker}-${quoteTicker}`,
-      data,
-    )
+    const response = generateRandomMarketDataResponse(displaySymbol)
+      .marketDataResponse.tradingPairs[0]
 
-    if (data == null || data.length === 0) {
-      console.error('❌ Error: Ticker Pair not found', args)
+    if (response == null) {
+      console.error(
+        '❌ Subscription Error: Ticket Pair not found',
+        displaySymbol,
+      )
 
       reject({
         marketDataResponse: undefined,
       })
     } else {
-      resolve(response as MarketDataResponse)
+      resolve({ marketDataResponse: response } as MarketDataResponse)
     }
   })