Fix indexer url info

frontend/src/Indexer/useIndexer.ts

@@ -0,0 +1,19 @@
+import { useSelector } from 'react-redux';
+import { createSelector } from 'reselect';
+import AppState from 'App/State/AppState';
+
+export function createIndexerSelector(indexerId?: number) {
+  return createSelector(
+    (state: AppState) => state.indexers.itemMap,
+    (state: AppState) => state.indexers.items,
+    (itemMap, allIndexers) => {
+      return indexerId ? allIndexers[itemMap[indexerId]] : undefined;
+    }
+  );
+}
+
+function useIndexer(indexerId?: number) {
+  return useSelector(createIndexerSelector(indexerId));
+}
+
+export default useIndexer;