1 files changed, 76 insertions, 0 deletions
diff --git a/packages/web-util/src/context/activity.ts b/packages/web-util/src/context/activity.ts
new file mode 100644
index 000000000..d12d1efb6
--- /dev/null
+++ b/packages/web-util/src/context/activity.ts
@@ -0,0 +1,76 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022-2024 Taler Systems S.A.
+
+ GNU 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.
+
+ GNU 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
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { ChallengerHttpClient, ObservabilityEvent, TalerAuthenticationHttpClient, TalerBankConversionHttpClient, TalerCoreBankHttpClient, TalerExchangeHttpClient, TalerMerchantInstanceHttpClient, TalerMerchantManagementHttpClient } from "@gnu-taler/taler-util";
+
+type Listener<Event> = (e: Event) => void;
+type Unsuscriber = () => void;
+export type Subscriber<Event> = (fn: Listener<Event>) => Unsuscriber;
+
+export class ActiviyTracker<Event> {
+  private observers = new Array<Listener<Event>>();
+  constructor() {
+    this.notify = this.notify.bind(this)
+    this.subscribe = this.subscribe.bind(this)
+  }
+  notify(data: Event): void {
+    this.observers.forEach((observer) => observer(data))
+  }
+  subscribe(func: Listener<Event>): Unsuscriber {
+    this.observers.push(func);
+    return () => {
+      this.observers.forEach((observer, index) => {
+        if (observer === func) {
+          this.observers.splice(index, 1);
+        }
+      });
+    };
+  }
+}
+
+/**
+ * build http client with cache breaker due to SWR
+ * @param url
+ * @returns
+ */
+export interface APIClient<T, C> {
+  getRemoteConfig(): Promise<C>;
+  VERSION: string;
+  lib: T,
+  onActivity: Subscriber<ObservabilityEvent>;
+  cancelRequest(id: string): void;
+}
+
+export interface MerchantLib {
+  instance: TalerMerchantManagementHttpClient;
+  authenticate: TalerAuthenticationHttpClient;
+  subInstanceApi: (instanceId: string) => MerchantLib;
+}
+
+export interface ExchangeLib {
+  exchange: TalerExchangeHttpClient;
+}
+
+export interface BankLib {
+  bank: TalerCoreBankHttpClient;
+  conversion: TalerBankConversionHttpClient;
+  auth: (user: string) => TalerAuthenticationHttpClient;
+}
+
+export interface ChallengerLib {
+  challenger: ChallengerHttpClient;
+}
+