10 feat download queue (#59)

* testing message queue

* better mq syncronisation

* major code refactoring, concern separation.

* bugfix

* code refactoring

* queuesize configurable via flags

* code refactoring

* comments

* code refactoring, updated readme

frontend/src/utils.ts

@@ -99,4 +99,19 @@ export const datetimeCompareFunc = (a: string, b: string) => new Date(a).getTime
 
 export function isRPCResponse(object: any): object is RPCResponse<any> {
   return 'result' in object && 'id' in object
+}
+
+export function mapProcessStatus(status: number) {
+  switch (status) {
+    case 0:
+      return 'Pending'
+    case 1:
+      return 'Downloading'
+    case 2:
+      return 'Completed'
+    case 3:
+      return 'Error'
+    default:
+      return 'Pending'
+  }
 }