1 files changed, 48 insertions, 0 deletions
diff --git a/packages/taler-wallet-webextension/src/hooks/useAsyncAsHook.ts b/packages/taler-wallet-webextension/src/hooks/useAsyncAsHook.ts
new file mode 100644
index 000000000..2131d45cb
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+++ b/packages/taler-wallet-webextension/src/hooks/useAsyncAsHook.ts
@@ -0,0 +1,48 @@
+/*
+ This file is part of TALER
+ (C) 2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+import { ExchangesListRespose } from "@gnu-taler/taler-util";
+import { useEffect, useState } from "preact/hooks";
+import * as wxApi from "../wxApi";
+
+interface HookOk<T> {
+  hasError: false;
+  response: T;
+}
+
+interface HookError {
+  hasError: true;
+  message: string;
+}
+
+export type HookResponse<T> = HookOk<T> | HookError | undefined;
+
+export function useAsyncAsHook<T> (fn: (() => Promise<T>)): HookResponse<T> {
+  const [result, setHookResponse] = useState<HookResponse<T>>(undefined);
+  useEffect(() => {
+    async function doAsync() {
+      try {
+        const response = await fn();
+        setHookResponse({ hasError: false, response });
+      } catch (e) {
+        if (e instanceof Error) {
+          setHookResponse({ hasError: true, message: e.message });
+        }
+      }
+    }
+    doAsync()
+  }, []);
+  return result;
+}