121 lines
3.9 KiB
TypeScript
121 lines
3.9 KiB
TypeScript
/*
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This file is part of GNU Taler
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(C) 2019 GNUnet e.V.
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GNU Taler is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* Imports.
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*/
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import { WalletNotification, BalancesResponse } from "@gnu-taler/taler-util";
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import { Stores } from "../db.js";
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import { Logger, CryptoApi, OpenedPromise, Database, CryptoWorkerFactory, openPromise } from "../index.js";
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import { PendingOperationsResponse } from "../pending-types.js";
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import { AsyncOpMemoMap, AsyncOpMemoSingle } from "../util/asyncMemo.js";
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import { HttpRequestLibrary } from "../util/http";
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type NotificationListener = (n: WalletNotification) => void;
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const logger = new Logger("state.ts");
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export const EXCHANGE_COINS_LOCK = "exchange-coins-lock";
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export const EXCHANGE_RESERVES_LOCK = "exchange-reserves-lock";
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export class InternalWalletState {
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memoProcessReserve: AsyncOpMemoMap<void> = new AsyncOpMemoMap();
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memoMakePlanchet: AsyncOpMemoMap<void> = new AsyncOpMemoMap();
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memoGetPending: AsyncOpMemoSingle<
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PendingOperationsResponse
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> = new AsyncOpMemoSingle();
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memoGetBalance: AsyncOpMemoSingle<BalancesResponse> = new AsyncOpMemoSingle();
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memoProcessRefresh: AsyncOpMemoMap<void> = new AsyncOpMemoMap();
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memoProcessRecoup: AsyncOpMemoMap<void> = new AsyncOpMemoMap();
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memoProcessDeposit: AsyncOpMemoMap<void> = new AsyncOpMemoMap();
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cryptoApi: CryptoApi;
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listeners: NotificationListener[] = [];
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/**
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* Promises that are waiting for a particular resource.
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*/
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private resourceWaiters: Record<string, OpenedPromise<void>[]> = {};
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/**
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* Resources that are currently locked.
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*/
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private resourceLocks: Set<string> = new Set();
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constructor(
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// FIXME: Make this a getter and make
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// the actual value nullable.
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// Check if we are in a DB migration / garbage collection
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// and throw an error in that case.
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public db: Database<typeof Stores>,
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public http: HttpRequestLibrary,
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cryptoWorkerFactory: CryptoWorkerFactory,
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) {
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this.cryptoApi = new CryptoApi(cryptoWorkerFactory);
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}
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notify(n: WalletNotification): void {
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logger.trace("Notification", n);
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for (const l of this.listeners) {
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const nc = JSON.parse(JSON.stringify(n));
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setTimeout(() => {
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l(nc);
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}, 0);
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}
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}
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addNotificationListener(f: (n: WalletNotification) => void): void {
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this.listeners.push(f);
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}
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/**
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* Run an async function after acquiring a list of locks, identified
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* by string tokens.
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*/
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async runSequentialized<T>(tokens: string[], f: () => Promise<T>) {
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// Make sure locks are always acquired in the same order
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tokens = [...tokens].sort();
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for (const token of tokens) {
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if (this.resourceLocks.has(token)) {
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const p = openPromise<void>();
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let waitList = this.resourceWaiters[token];
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if (!waitList) {
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waitList = this.resourceWaiters[token] = [];
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}
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waitList.push(p);
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await p.promise;
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}
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this.resourceLocks.add(token);
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}
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try {
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logger.trace(`begin exclusive execution on ${JSON.stringify(tokens)}`);
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const result = await f();
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logger.trace(`end exclusive execution on ${JSON.stringify(tokens)}`);
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return result;
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} finally {
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for (const token of tokens) {
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this.resourceLocks.delete(token);
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let waiter = (this.resourceWaiters[token] ?? []).shift();
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if (waiter) {
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waiter.resolve();
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}
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}
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}
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}
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}
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