dcp-client/libexec/sandbox/calculate-capabilities.js

Core libraries for accessing DCP network

/**
 *  @file       worker/evaluator-lib/calculate-capabilities.js
 *              Copyright (c) 2020-2022, Distributive. All Rights Reserved.
 *
 *              This file provides a message handler for handling capabilities requests.
 *
 *  @author     Ryan Rossiter, ryan@kingsds.network
 *  @date       Sept 2020
 */

/* global WebGPUWindow GPU */
// @ts-nocheck

self.wrapScriptLoading({ scriptName: 'calculate-capabilities' }, function calculateCapabilities$$fn(protectedStorage, ring2PostMessage)
{
    async function getCapabilities() {
      let offscreenCanvas = false;
      let webgpu = false;
      let useStrict = true;

      let fdlibmFlag = true;
      const inputFdlibm = [
        7.330382858376182753090688493103,
        9.424777960769379347993890405633,
        14.660765716752370835251895186957,
        16.755160819145565653798257699236,
        7.33038285837618,
      ];

      const outputFdlibm = [
        1525.965888988748247356852516531944,
        12391.64780791669181780889630317688,
        2328571.89435723237693309783935546875,
        18909231.8632431328296661376953125,
        1525.965888988744154630694538354874,
      ];
      let testCode = `
      "use strict";
      (function testFun(a) {
        a=a+1;
        return arguments[0];
      });`

      await protectedStorage.webGPUInitialization();
      if (!protectedStorage.forceDisableWebGPU)
        webgpu = Boolean(globalThis.navigator?.gpu);

      if (webgpu) {
        try {
          const adapter = await navigator.gpu.requestAdapter();
          const device = await adapter.requestDevice();
          device.destroy();
        } catch (err) {
          // if glfw fails or the symbols exist but webgpu hasn't been
          // properly enabled (mozilla)
          webgpu = false;
        }
      }

      offscreenCanvas = !!(
        typeof OffscreenCanvas !== 'undefined' && new OffscreenCanvas(1, 1)
      );

      try {
        for (let i = 0; i < inputFdlibm.length; i++) {
          if (
            Math.exp(inputFdlibm[i]).toFixed(30) !== outputFdlibm[i].toFixed(30)
          ) {
            fdlibmFlag = false;
            break;
          }
        }
      } catch (err) {
        fdlibmFlag = false;
      }

      if(eval(testCode)(1) !== 1)
        useStrict = false;

      return {
        environment: {
          webgpu,
          offscreenCanvas,
          fdlibm: fdlibmFlag,
        },
        useStrict,      // strict-mode in the work function
      };
    }

    addEventListener('message', async (event) => {
      try {
        if (event.request === 'describe') {
          const worktimes = protectedStorage.worktimes.getWorktimeList();
          const capabilities = await getCapabilities();
          ring2PostMessage({
            capabilities,
            worktimes,
            request: 'describe',
          });
        }
      } catch (error) {
        ring2PostMessage({
          request: 'error',
          error: {
            name: error.name,
            message: error.message,
            stack: error.stack,
          },
        });
      }
    });
  },
);