From 13e7a674778754c0ed641dfd428e3d6b2b71ab2d Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Mon, 5 Sep 2022 18:12:30 +0200
Subject: wallet-core: uniform retry handling

---
 packages/taler-wallet-core/src/util/query.ts | 41 ++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'packages/taler-wallet-core/src/util/query.ts')

diff --git a/packages/taler-wallet-core/src/util/query.ts b/packages/taler-wallet-core/src/util/query.ts
index e954e5c78..65b67eff2 100644
--- a/packages/taler-wallet-core/src/util/query.ts
+++ b/packages/taler-wallet-core/src/util/query.ts
@@ -152,6 +152,19 @@ class ResultStream<T> {
     return arr;
   }
 
+  async mapAsync<R>(f: (x: T) => Promise<R>): Promise<R[]> {
+    const arr: R[] = [];
+    while (true) {
+      const x = await this.next();
+      if (x.hasValue) {
+        arr.push(await f(x.value));
+      } else {
+        break;
+      }
+    }
+    return arr;
+  }
+
   async forEachAsync(f: (x: T) => Promise<void>): Promise<void> {
     while (true) {
       const x = await this.next();
@@ -572,6 +585,26 @@ function makeWriteContext(
   return ctx;
 }
 
+const storeList = [
+  { name: "foo" as const, value: 1 as const },
+  { name: "bar" as const, value: 2 as const },
+];
+// => { foo: { value: 1}, bar: {value: 2} }
+
+type StoreList = typeof storeList;
+
+type StoreNames = StoreList[number] extends { name: infer I } ? I : never;
+
+type H = StoreList[number] & { name: "foo"};
+
+type Cleanup<V> = V extends { name: infer N, value: infer X} ? {name: N, value: X} : never;
+
+type G = {
+  [X in StoreNames]: {
+    X: StoreList[number] & { name: X };
+  };
+};
+
 /**
  * Type-safe access to a database with a particular store map.
  *
@@ -584,6 +617,14 @@ export class DbAccess<StoreMap> {
     return this.db;
   }
 
+  mktx2<
+    StoreNames extends keyof StoreMap,
+    Stores extends StoreMap[StoreNames],
+    StoreList extends Stores[],
+  >(namePicker: (x: StoreMap) => StoreList): StoreList {
+    return namePicker(this.stores);
+  }
+
   mktx<
     PickerType extends (x: StoreMap) => unknown,
     BoundStores extends GetPickerType<PickerType, StoreMap>,
-- 
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