survey/templates/bench/prove.ts

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/*
* mCaptcha is a PoW based DoS protection software.
* This is the frontend web component of the mCaptcha system
* Copyright © 2021 Aravinth Manivnanan <realaravinth@batsense.net>.
*
* Use of this source code is governed by Apache 2.0 or MIT license.
* You shoud have received a copy of MIT and Apache 2.0 along with
* this program. If not, see <https://spdx.org/licenses/MIT.html> for
* MIT or <http://www.apache.org/licenses/LICENSE-2.0> for Apache.
*/
import * as p from "@mcaptcha/pow_sha256-polyfill";
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import { PoWConfig, SubmissionType } from "./types";
export const get_bench_type = async (): Promise<SubmissionType> => {
console.log(`Wasm support says ${WasmSupported}`);
let submission_type: SubmissionType;
if (WasmSupported) {
submission_type = SubmissionType.wasm;
} else {
submission_type = SubmissionType.js;
}
return submission_type;
};
/**
* proove work
* @param {PoWConfig} config - the proof-of-work configuration using which
* work needs to be computed
* */
const prove = async (config: PoWConfig): Promise<number> => {
console.log(`Wasm support says ${WasmSupported}`);
let duration: number;
if (WasmSupported) {
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const wasm = await require("@mcaptcha/pow-wasm");
const t0 = performance.now();
wasm.gen_pow(config.salt, config.string, config.difficulty_factor);
const t1 = performance.now();
duration = t1 - t0;
} else {
console.log("WASM unsupported, expect delay during proof generation");
const t0 = performance.now();
await p.generate_work(config.salt, config.string, config.difficulty_factor);
const t1 = performance.now();
duration = t1 - t0;
}
return duration;
};
// credits: @jf-bastien on Stack Overflow
// https://stackoverflow.com/questions/47879864/how-can-i-check-if-a-browser-supports-webassembly
const WasmSupported = (() => {
try {
if (
typeof WebAssembly === "object" &&
typeof WebAssembly.instantiate === "function"
) {
const module = new WebAssembly.Module(
Uint8Array.of(0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00)
);
if (module instanceof WebAssembly.Module)
return new WebAssembly.Instance(module) instanceof WebAssembly.Instance;
}
} catch (e) {
console.error(e);
}
return false;
})();
export default prove;