sync providers concurrently instead of in series

main.go

@@ -86,22 +86,29 @@ func refreshData() {
 	}
 	lastRefresh = time.Now()
 
+	var wg *sync.WaitGroup
+
 	// Loop through each configured account provider and attempt to get the account balances, and update YNAB
 	for _, p := range configuredProviders {
-		balances, accountIDs, err := p.GetBalances()
+		wg.Add(1)
-		if err != nil {
+		go func() {
-			log.Printf("failed to get balances with provider '%s': %v", p.Name(), err)
+			defer wg.Done()
-			continue
+			balances, accountIDs, err := p.GetBalances()
-		}
-		if len(balances) != len(accountIDs) {
-			log.Printf("'%s' provider data validation error: mismatched balance and accountID slice lengths - expected the same: balances length = %d, accountIDs length = %d", p.Name(), len(balances), len(accountIDs))
-			continue
-		}
-		for i := range balances {
-			err = ynabClient.SetAccountBalance(accountIDs[i], balances[i])
 			if err != nil {
-				log.Printf("failed to update ynab account '%s' balance: %v", accountIDs[i], err)
+				log.Printf("failed to get balances with provider '%s': %v", p.Name(), err)
+				return
 			}
-		}
+			if len(balances) != len(accountIDs) {
+				log.Printf("'%s' provider data validation error: mismatched balance and accountID slice lengths - expected the same: balances length = %d, accountIDs length = %d", p.Name(), len(balances), len(accountIDs))
+				return
+			}
+			for i := range balances {
+				err = ynabClient.SetAccountBalance(accountIDs[i], balances[i])
+				if err != nil {
+					log.Printf("failed to update ynab account '%s' balance: %v", accountIDs[i], err)
+				}
+			}
+		}()
 	}
+	wg.Wait()
 }