web: migrate System Task list to web

web/src/api/SystemTask.ts

@@ -0,0 +1,33 @@
+import { DefaultClient, QueryArguments } from "./Client";
+
+export enum TaskStatus {
+    SUCCESSFUL = 1,
+    WARNING = 2,
+    ERROR = 4,
+}
+
+export class SystemTask {
+
+    task_name: string;
+    task_description: string;
+    task_finish_timestamp: number;
+    status: TaskStatus;
+    messages: string[];
+
+    constructor() {
+        throw Error();
+    }
+
+    static get(task_name: string): Promise<SystemTask> {
+        return DefaultClient.fetch<SystemTask>(["admin", "system_tasks", task_name]);
+    }
+
+    static list(filter?: QueryArguments): Promise<SystemTask[]> {
+        return DefaultClient.fetch<SystemTask[]>(["admin", "system_tasks"], filter);
+    }
+
+    static retry(task_name: string): string {
+        return DefaultClient.makeUrl(["admin", "system_tasks", task_name, "retry"]);
+    }
+
+}