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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 type { IDBFactory } from "@gnu-taler/idb-bridge";
// eslint-disable-next-line no-duplicate-imports
import {
AccessStats,
BridgeIDBFactory,
MemoryBackend,
createSqliteBackend,
shimIndexedDB,
} from "@gnu-taler/idb-bridge";
import { createNodeSqlite3Impl } from "@gnu-taler/idb-bridge/node-sqlite3-bindings";
import {
Logger,
SetTimeoutTimerAPI,
WalletRunConfig,
} from "@gnu-taler/taler-util";
import { createPlatformHttpLib } from "@gnu-taler/taler-util/http";
import * as fs from "fs";
import { NodeThreadCryptoWorkerFactory } from "./crypto/workers/nodeThreadWorker.js";
import { SynchronousCryptoWorkerFactoryPlain } from "./crypto/workers/synchronousWorkerFactoryPlain.js";
import { DefaultNodeWalletArgs, makeTempfileId } from "./host-common.js";
import { Wallet } from "./wallet.js";
const logger = new Logger("host-impl.node.ts");
interface MakeDbResult {
idbFactory: BridgeIDBFactory;
getStats: () => AccessStats;
}
async function makeFileDb(
args: DefaultNodeWalletArgs = {},
): Promise<MakeDbResult> {
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: any) {
const code: string = e.code;
if (code === "ENOENT") {
logger.trace("wallet file doesn't exist yet");
} else {
logger.error("could not open wallet database file");
throw Error(
"could not open wallet database file",
// @ts-expect-error no support for options.cause yet
{ cause: e },
);
}
}
myBackend.afterCommitCallback = async () => {
logger.trace("committing database");
// Allow caller to stop persisting the wallet.
if (args.persistentStoragePath === undefined) {
return;
}
const tmpPath = `${args.persistentStoragePath}-${makeTempfileId(5)}.tmp`;
logger.trace("exported DB dump");
const dbContent = myBackend.exportDump();
fs.writeFileSync(tmpPath, JSON.stringify(dbContent, undefined, 2), {
encoding: "utf-8",
});
// Atomically move the temporary file onto the DB path.
fs.renameSync(tmpPath, args.persistentStoragePath);
logger.trace("committing database done");
};
}
BridgeIDBFactory.enableTracing = false;
const myBridgeIdbFactory = new BridgeIDBFactory(myBackend);
return {
idbFactory: myBridgeIdbFactory,
getStats: () => myBackend.accessStats,
};
}
async function makeSqliteDb(
args: DefaultNodeWalletArgs,
): Promise<MakeDbResult> {
BridgeIDBFactory.enableTracing = false;
const imp = await createNodeSqlite3Impl();
const dbFilename = args.persistentStoragePath ?? ":memory:";
logger.info(`using database ${dbFilename}`);
const myBackend = await createSqliteBackend(imp, {
filename: dbFilename,
});
myBackend.enableTracing = false;
if (process.env.TALER_WALLET_DBSTATS) {
myBackend.trackStats = true;
}
const myBridgeIdbFactory = new BridgeIDBFactory(myBackend);
return {
getStats() {
return myBackend.accessStats;
},
idbFactory: myBridgeIdbFactory,
};
}
/**
* Get a wallet instance with default settings for node.
*
* Extended version that allows getting DB stats.
*/
export async function createNativeWalletHost2(
args: DefaultNodeWalletArgs = {},
): Promise<{
wallet: Wallet;
getDbStats: () => AccessStats;
}> {
const myHttpFactory = (config: WalletRunConfig) => {
let myHttpLib;
if (args.httpLib) {
myHttpLib = args.httpLib;
} else {
myHttpLib = createPlatformHttpLib({
enableThrottling: true,
requireTls: !config.features.allowHttp,
});
}
return myHttpLib;
};
let dbResp: MakeDbResult;
if (
args.persistentStoragePath &&
args.persistentStoragePath.endsWith(".json")
) {
logger.info("using JSON file DB backend (slow, only use for testing)");
dbResp = await makeFileDb(args);
} else {
logger.info(`using sqlite3 DB backend`);
dbResp = await makeSqliteDb(args);
}
const myIdbFactory: IDBFactory = dbResp.idbFactory as any as IDBFactory;
shimIndexedDB(dbResp.idbFactory);
let workerFactory;
const cryptoWorkerType = args.cryptoWorkerType ?? "node-worker-thread";
if (cryptoWorkerType === "sync") {
logger.info("using synchronous crypto worker");
workerFactory = new SynchronousCryptoWorkerFactoryPlain();
} else if (cryptoWorkerType === "node-worker-thread") {
try {
// Try if we have worker threads available, fails in older node versions.
const _r = "require";
// eslint-disable-next-line no-unused-vars
const worker_threads = module[_r]("worker_threads");
// require("worker_threads");
workerFactory = new NodeThreadCryptoWorkerFactory();
logger.info("using node thread crypto worker");
} catch (e) {
logger.warn(
"worker threads not available, falling back to synchronous workers",
);
workerFactory = new SynchronousCryptoWorkerFactoryPlain();
}
} else {
throw Error(`unsupported crypto worker type '${cryptoWorkerType}'`);
}
const timer = new SetTimeoutTimerAPI();
const w = await Wallet.create(
myIdbFactory,
myHttpFactory,
timer,
workerFactory,
);
if (args.notifyHandler) {
w.addNotificationListener(args.notifyHandler);
}
return {
wallet: w,
getDbStats: dbResp.getStats,
};
}
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