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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 { EmscEnvironment } from "./emscInterface";
import { CryptoImplementation } from "./cryptoImplementation";
/**
* Worker implementation that uses node subprocesses.
*/
export class SynchronousCryptoWorker {
private cachedEmscEnvironment: EmscEnvironment | undefined = undefined;
private cachedEmscEnvironmentPromise: Promise<EmscEnvironment> | undefined = undefined;
/**
* 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);
constructor() {
this.onerror = undefined;
this.onmessage = undefined;
}
/**
* 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 getEmscriptenEnvironment(): Promise<EmscEnvironment> {
if (this.cachedEmscEnvironment) {
return Promise.resolve(this.cachedEmscEnvironment);
}
if (this.cachedEmscEnvironmentPromise) {
return this.cachedEmscEnvironmentPromise;
}
// Make sure that TypeScript doesn't try
// to check the taler-emscripten-lib.
const indirectRequire = require;
const g = global;
// unavoidable hack, so that emscripten detects
// the environment as node even though importScripts
// is present.
// @ts-ignore
const savedImportScripts = g.importScripts;
// @ts-ignore
delete g.importScripts;
// Assume that the code is run from the build/ directory.
const libFn = indirectRequire(
"../../../emscripten/taler-emscripten-lib.js",
);
const lib = libFn();
// @ts-ignore
g.importScripts = savedImportScripts;
if (!lib) {
throw Error("could not load taler-emscripten-lib.js");
}
if (!lib.ccall) {
throw Error(
"sanity check failed: taler-emscripten lib does not have 'ccall'",
);
}
this.cachedEmscEnvironmentPromise = new Promise((resolve, reject) => {
lib.onRuntimeInitialized = () => {
this.cachedEmscEnvironmentPromise = undefined;
this.cachedEmscEnvironment = new EmscEnvironment(lib);
resolve(this.cachedEmscEnvironment);
};
});
return this.cachedEmscEnvironmentPromise;
}
private dispatchMessage(msg: any) {
if (this.onmessage) {
this.onmessage({ data: msg });
}
}
private async handleRequest(operation: string, id: number, args: string[]) {
let emsc = await this.getEmscriptenEnvironment();
const impl = new CryptoImplementation(emsc);
if (!(operation in impl)) {
console.error(`crypto operation '${operation}' not found`);
return;
}
try {
const result = (impl as any)[operation](...args);
this.dispatchMessage({ result, id });
} catch (e) {
console.log("error during operation", e);
return;
}
}
/**
* Send a message to the worker thread.
*/
postMessage(msg: any) {
const args = msg.args;
if (!Array.isArray(args)) {
console.error("args must be array");
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, args);
}
/**
* Forcibly terminate the worker thread.
*/
terminate() {
console.log("terminating synchronous worker (no-op)");
}
}
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