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/*
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/>
*/
import { Logger } from "@gnu-taler/taler-util";
import {
nativeCryptoR,
TalerCryptoInterfaceR,
} from "../cryptoImplementation.js";
const logger = new Logger("synchronousWorker.ts");
/**
* Worker implementation that uses node subprocesses.
*/
export class SynchronousCryptoWorker {
/**
* Function to be called when we receive a message from the worker thread.
*/
onmessage: undefined | ((m: any) => void);
/**
* Function to be called when we receive an error from the worker thread.
*/
onerror: undefined | ((m: any) => void);
cryptoImplR: TalerCryptoInterfaceR;
constructor() {
this.onerror = undefined;
this.onmessage = undefined;
this.cryptoImplR = { ...nativeCryptoR };
}
/**
* Add an event listener for either an "error" or "message" event.
*/
addEventListener(event: "message" | "error", fn: (x: any) => void): void {
switch (event) {
case "message":
this.onmessage = fn;
break;
case "error":
this.onerror = fn;
break;
}
}
private dispatchMessage(msg: any): void {
if (this.onmessage) {
this.onmessage({ data: msg });
}
}
private async handleRequest(
operation: string,
id: number,
args: string[],
): Promise<void> {
const impl = this.cryptoImplR;
if (!(operation in impl)) {
console.error(`crypto operation '${operation}' not found`);
return;
}
let result: any;
try {
result = await (impl as any)[operation](...args);
} catch (e: any) {
logger.error(`error during operation '${operation}': ${e}`);
return;
}
try {
setTimeout(() => this.dispatchMessage({ result, id }), 0);
} catch (e) {
logger.error("got error during dispatch", e);
}
}
/**
* Send a message to the worker thread.
*/
postMessage(msg: any): void {
const req = msg.req;
if (typeof req !== "object") {
console.error("request must be an object");
return;
}
const id = msg.id;
if (typeof id !== "number") {
console.error("RPC id must be number");
return;
}
const operation = msg.operation;
if (typeof operation !== "string") {
console.error("RPC operation must be string");
return;
}
this.handleRequest(operation, id, req).catch((e) => {
console.error("Error while handling crypto request:", e);
});
}
/**
* Forcibly terminate the worker thread.
*/
terminate(): void {
// This is a no-op.
}
}
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