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/*
This file is part of GNU Taler
(C) 2019 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/>
*/
/**
* Helpers to create headless wallets.
* @author Florian Dold <dold@taler.net>
*/
/**
* Imports.
*/
import { Wallet } from "../wallet";
import { MemoryBackend, BridgeIDBFactory, shimIndexedDB } from "idb-bridge";
import { openTalerDatabase } from "../db";
import { HttpRequestLibrary } from "../util/http";
import fs from "fs";
import { NodeThreadCryptoWorkerFactory } from "../crypto/workers/nodeThreadWorker";
import { WalletNotification } from "../types/notifications";
import { Database } from "../util/query";
import { NodeHttpLib } from "./NodeHttpLib";
import { Logger } from "../util/logging";
import { SynchronousCryptoWorkerFactory } from "../crypto/workers/synchronousWorker";
const logger = new Logger("headless/helpers.ts");
export interface DefaultNodeWalletArgs {
/**
* Location of the wallet database.
*
* If not specified, the wallet starts out with an empty database and
* the wallet database is stored only in memory.
*/
persistentStoragePath?: string;
/**
* Handler for asynchronous notifications from the wallet.
*/
notifyHandler?: (n: WalletNotification) => void;
/**
* If specified, use this as HTTP request library instead
* of the default one.
*/
httpLib?: HttpRequestLibrary;
}
/**
* Get a wallet instance with default settings for node.
*/
export async function getDefaultNodeWallet(
args: DefaultNodeWalletArgs = {},
): Promise<Wallet> {
BridgeIDBFactory.enableTracing = false;
const myBackend = new MemoryBackend();
myBackend.enableTracing = false;
const storagePath = args.persistentStoragePath;
if (storagePath) {
try {
const dbContentStr: string = fs.readFileSync(storagePath, {
encoding: "utf-8",
});
const dbContent = JSON.parse(dbContentStr);
myBackend.importDump(dbContent);
} catch (e) {
logger.warn("could not read wallet file");
}
myBackend.afterCommitCallback = async () => {
// Allow caller to stop persisting the wallet.
if (args.persistentStoragePath === undefined) {
return;
}
const dbContent = myBackend.exportDump();
fs.writeFileSync(storagePath, JSON.stringify(dbContent, undefined, 2), {
encoding: "utf-8",
});
};
}
BridgeIDBFactory.enableTracing = false;
const myBridgeIdbFactory = new BridgeIDBFactory(myBackend);
const myIdbFactory: IDBFactory = (myBridgeIdbFactory as any) as IDBFactory;
let myHttpLib;
if (args.httpLib) {
myHttpLib = args.httpLib;
} else {
myHttpLib = new NodeHttpLib();
}
const myVersionChange = (): Promise<void> => {
console.error("version change requested, should not happen");
throw Error();
};
shimIndexedDB(myBridgeIdbFactory);
const myDb = await openTalerDatabase(myIdbFactory, myVersionChange);
let workerFactory;
try {
// Try if we have worker threads available, fails in older node versions.
require("worker_threads");
workerFactory = new NodeThreadCryptoWorkerFactory();
} catch (e) {
console.log(
"worker threads not available, falling back to synchronous workers",
);
workerFactory = new SynchronousCryptoWorkerFactory();
}
const dbWrap = new Database(myDb);
const w = new Wallet(dbWrap, myHttpLib, workerFactory);
if (args.notifyHandler) {
w.addNotificationListener(args.notifyHandler);
}
return w;
}
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