missing files

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diff --git a/packages/taler-wallet-core/src/internal-wallet-state.ts b/packages/taler-wallet-core/src/internal-wallet-state.ts
new file mode 100644
index 000000000..904398722
--- /dev/null
+++ b/packages/taler-wallet-core/src/internal-wallet-state.ts
@@ -0,0 +1,257 @@
+/*
+ This file is part of GNU Taler
+ (C) 2019 GNUnet e.V.
+
+ 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/>
+ */
+
+/**
+ * Common interface of the internal wallet state.  This object is passed
+ * to the various operations (exchange management, withdrawal, refresh, reserve
+ * management, etc.).
+ *
+ * Some operations can be accessed via this state object.  This allows mutual
+ * recursion between operations, without having cyclic dependencies between
+ * the respective TypeScript files.
+ *
+ * (You can think of this as a "header file" for the wallet implementation.)
+ */
+
+/**
+ * Imports.
+ */
+import {
+  WalletNotification,
+  BalancesResponse,
+  AmountJson,
+  DenominationPubKey,
+  TalerProtocolTimestamp,
+} from "@gnu-taler/taler-util";
+import { CryptoApi } from "./crypto/workers/cryptoApi.js";
+import { ExchangeDetailsRecord, ExchangeRecord, WalletStoresV1 } from "./db.js";
+import { PendingOperationsResponse } from "./pending-types.js";
+import { AsyncOpMemoMap, AsyncOpMemoSingle } from "./util/asyncMemo.js";
+import { HttpRequestLibrary } from "./util/http.js";
+import { AsyncCondition } from "./util/promiseUtils.js";
+import {
+  DbAccess,
+  GetReadOnlyAccess,
+  GetReadWriteAccess,
+} from "./util/query.js";
+import { TimerGroup } from "./util/timer.js";
+
+export const EXCHANGE_COINS_LOCK = "exchange-coins-lock";
+export const EXCHANGE_RESERVES_LOCK = "exchange-reserves-lock";
+
+export interface TrustInfo {
+  isTrusted: boolean;
+  isAudited: boolean;
+}
+
+export interface MerchantInfo {
+  protocolVersionCurrent: number;
+}
+
+/**
+ * Interface for merchant-related operations.
+ */
+export interface MerchantOperations {
+  getMerchantInfo(
+    ws: InternalWalletState,
+    merchantBaseUrl: string,
+  ): Promise<MerchantInfo>;
+}
+
+export interface ReserveOperations {
+  processReserve(
+    ws: InternalWalletState,
+    reservePub: string,
+    forceNow?: boolean,
+  ): Promise<void>;
+}
+
+/**
+ * Interface for exchange-related operations.
+ */
+export interface ExchangeOperations {
+  // FIXME:  Should other operations maybe always use
+  // updateExchangeFromUrl?
+  getExchangeDetails(
+    tx: GetReadOnlyAccess<{
+      exchanges: typeof WalletStoresV1.exchanges;
+      exchangeDetails: typeof WalletStoresV1.exchangeDetails;
+    }>,
+    exchangeBaseUrl: string,
+  ): Promise<ExchangeDetailsRecord | undefined>;
+  getExchangeTrust(
+    ws: InternalWalletState,
+    exchangeInfo: ExchangeRecord,
+  ): Promise<TrustInfo>;
+  updateExchangeFromUrl(
+    ws: InternalWalletState,
+    baseUrl: string,
+    acceptedFormat?: string[],
+    forceNow?: boolean,
+  ): Promise<{
+    exchange: ExchangeRecord;
+    exchangeDetails: ExchangeDetailsRecord;
+  }>;
+}
+
+export interface RecoupOperations {
+  createRecoupGroup(
+    ws: InternalWalletState,
+    tx: GetReadWriteAccess<{
+      recoupGroups: typeof WalletStoresV1.recoupGroups;
+      denominations: typeof WalletStoresV1.denominations;
+      refreshGroups: typeof WalletStoresV1.refreshGroups;
+      coins: typeof WalletStoresV1.coins;
+    }>,
+    coinPubs: string[],
+  ): Promise<string>;
+  processRecoupGroup(
+    ws: InternalWalletState,
+    recoupGroupId: string,
+    forceNow?: boolean,
+  ): Promise<void>;
+}
+
+export interface DenomInfo {
+  /**
+   * Value of one coin of the denomination.
+   */
+  value: AmountJson;
+
+  /**
+   * The denomination public key.
+   */
+  denomPub: DenominationPubKey;
+
+  /**
+   * Hash of the denomination public key.
+   * Stored in the database for faster lookups.
+   */
+  denomPubHash: string;
+
+  /**
+   * Fee for withdrawing.
+   */
+  feeWithdraw: AmountJson;
+
+  /**
+   * Fee for depositing.
+   */
+  feeDeposit: AmountJson;
+
+  /**
+   * Fee for refreshing.
+   */
+  feeRefresh: AmountJson;
+
+  /**
+   * Fee for refunding.
+   */
+  feeRefund: AmountJson;
+
+  /**
+   * Validity start date of the denomination.
+   */
+  stampStart: TalerProtocolTimestamp;
+
+  /**
+   * Date after which the currency can't be withdrawn anymore.
+   */
+  stampExpireWithdraw: TalerProtocolTimestamp;
+
+  /**
+   * Date after the denomination officially doesn't exist anymore.
+   */
+  stampExpireLegal: TalerProtocolTimestamp;
+
+  /**
+   * Data after which coins of this denomination can't be deposited anymore.
+   */
+  stampExpireDeposit: TalerProtocolTimestamp;
+}
+
+export type NotificationListener = (n: WalletNotification) => void;
+
+/**
+ * Internal, shard wallet state that is used by the implementation
+ * of wallet operations.
+ *
+ * FIXME:  This should not be exported anywhere from the taler-wallet-core package,
+ * as it's an opaque implementation detail.
+ */
+export interface InternalWalletState {
+  memoProcessReserve: AsyncOpMemoMap<void>;
+  memoMakePlanchet: AsyncOpMemoMap<void>;
+  memoGetPending: AsyncOpMemoSingle<PendingOperationsResponse>;
+  memoGetBalance: AsyncOpMemoSingle<BalancesResponse>;
+  memoProcessRefresh: AsyncOpMemoMap<void>;
+  memoProcessRecoup: AsyncOpMemoMap<void>;
+  memoProcessDeposit: AsyncOpMemoMap<void>;
+  cryptoApi: CryptoApi;
+
+  timerGroup: TimerGroup;
+  stopped: boolean;
+
+  insecureTrustExchange: boolean;
+
+  /**
+   * Asynchronous condition to interrupt the sleep of the
+   * retry loop.
+   *
+   * Used to allow processing of new work faster.
+   */
+  latch: AsyncCondition;
+
+  listeners: NotificationListener[];
+
+  initCalled: boolean;
+
+  merchantInfoCache: Record<string, MerchantInfo>;
+
+  exchangeOps: ExchangeOperations;
+  recoupOps: RecoupOperations;
+  merchantOps: MerchantOperations;
+  reserveOps: ReserveOperations;
+
+  getDenomInfo(
+    ws: InternalWalletState,
+    tx: GetReadOnlyAccess<{
+      denominations: typeof WalletStoresV1.denominations;
+    }>,
+    exchangeBaseUrl: string,
+    denomPubHash: string,
+  ): Promise<DenomInfo | undefined>;
+
+  db: DbAccess<typeof WalletStoresV1>;
+  http: HttpRequestLibrary;
+
+  notify(n: WalletNotification): void;
+
+  addNotificationListener(f: (n: WalletNotification) => void): void;
+
+  /**
+   * Stop ongoing processing.
+   */
+  stop(): void;
+
+  /**
+   * Run an async function after acquiring a list of locks, identified
+   * by string tokens.
+   */
+  runSequentialized<T>(tokens: string[], f: () => Promise<T>): Promise<T>;
+
+  runUntilDone(req?: { maxRetries?: number }): Promise<void>;
+}
diff --git a/packages/taler-wallet-core/src/operations/common.ts b/packages/taler-wallet-core/src/operations/common.ts
new file mode 100644
index 000000000..5525b4deb
--- /dev/null
+++ b/packages/taler-wallet-core/src/operations/common.ts
@@ -0,0 +1,51 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022 GNUnet e.V.
+
+ 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 { TalerErrorDetail, TalerErrorCode } from "@gnu-taler/taler-util";
+import { CryptoApiStoppedError } from "../crypto/workers/cryptoApi.js";
+import { TalerError, getErrorDetailFromException } from "../errors.js";
+
+/**
+ * Run an operation and call the onOpError callback
+ * when there was an exception or operation error that must be reported.
+ * The cause will be re-thrown to the caller.
+ */
+export async function guardOperationException<T>(
+  op: () => Promise<T>,
+  onOpError: (e: TalerErrorDetail) => Promise<void>,
+): Promise<T> {
+  try {
+    return await op();
+  } catch (e: any) {
+    if (e instanceof CryptoApiStoppedError) {
+      throw e;
+    }
+    if (
+      e instanceof TalerError &&
+      e.hasErrorCode(TalerErrorCode.WALLET_PENDING_OPERATION_FAILED)
+    ) {
+      throw e;
+    }
+    const opErr = getErrorDetailFromException(e);
+    await onOpError(opErr);
+    throw TalerError.fromDetail(
+      TalerErrorCode.WALLET_PENDING_OPERATION_FAILED,
+      {
+        innerError: e.errorDetail,
+      },
+    );
+  }
+}