denoland-deno/runtime/js/99_main.js

// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
// Removes the `__proto__` for security reasons.  This intentionally makes
// Deno non compliant with ECMA-262 Annex B.2.2.1
//
"use strict";
delete Object.prototype.__proto__;

((window) => {
  const core = Deno.core;
  const util = window.__bootstrap.util;
  const eventTarget = window.__bootstrap.eventTarget;
  const globalInterfaces = window.__bootstrap.globalInterfaces;
  const location = window.__bootstrap.location;
  const build = window.__bootstrap.build;
  const version = window.__bootstrap.version;
  const errorStack = window.__bootstrap.errorStack;
  const os = window.__bootstrap.os;
  const timers = window.__bootstrap.timers;
  const base64 = window.__bootstrap.base64;
  const encoding = window.__bootstrap.encoding;
  const Console = window.__bootstrap.console.Console;
  const worker = window.__bootstrap.worker;
  const signals = window.__bootstrap.signals;
  const internals = window.__bootstrap.internals;
  const performance = window.__bootstrap.performance;
  const crypto = window.__bootstrap.crypto;
  const url = window.__bootstrap.url;
  const headers = window.__bootstrap.headers;
  const streams = window.__bootstrap.streams;
  const fileReader = window.__bootstrap.fileReader;
  const webgpu = window.__bootstrap.webgpu;
  const webSocket = window.__bootstrap.webSocket;
  const webStorage = window.__bootstrap.webStorage;
  const broadcastChannel = window.__bootstrap.broadcastChannel;
  const file = window.__bootstrap.file;
  const formData = window.__bootstrap.formData;
  const fetch = window.__bootstrap.fetch;
  const prompt = window.__bootstrap.prompt;
  const messagePort = window.__bootstrap.messagePort;
  const denoNs = window.__bootstrap.denoNs;
  const denoNsUnstable = window.__bootstrap.denoNsUnstable;
  const errors = window.__bootstrap.errors.errors;
  const webidl = window.__bootstrap.webidl;
  const { defineEventHandler } = window.__bootstrap.webUtil;
  const { deserializeJsMessageData, serializeJsMessageData } =
    window.__bootstrap.messagePort;

  let windowIsClosing = false;

  function windowClose() {
    if (!windowIsClosing) {
      windowIsClosing = true;
      // Push a macrotask to exit after a promise resolve.
      // This is not perfect, but should be fine for first pass.
      Promise.resolve().then(() =>
        timers.setTimeout.call(
          null,
          () => {
            // This should be fine, since only Window/MainWorker has .close()
            os.exit(0);
          },
          0,
        )
      );
    }
  }

  function workerClose() {
    if (isClosing) {
      return;
    }

    isClosing = true;
    core.opSync("op_worker_close");
  }

  // TODO(bartlomieju): remove these functions
  // Stuff for workers
  const onmessage = () => {};
  const onerror = () => {};

  function postMessage(message, transferOrOptions = {}) {
    const prefix =
      "Failed to execute 'postMessage' on 'DedicatedWorkerGlobalScope'";
    webidl.requiredArguments(arguments.length, 1, { prefix });
    message = webidl.converters.any(message);
    let options;
    if (
      webidl.type(transferOrOptions) === "Object" &&
      transferOrOptions !== undefined &&
      transferOrOptions[Symbol.iterator] !== undefined
    ) {
      const transfer = webidl.converters["sequence<object>"](
        transferOrOptions,
        { prefix, context: "Argument 2" },
      );
      options = { transfer };
    } else {
      options = webidl.converters.PostMessageOptions(transferOrOptions, {
        prefix,
        context: "Argument 2",
      });
    }
    const { transfer } = options;
    const data = serializeJsMessageData(message, transfer);
    core.opSync("op_worker_post_message", data);
  }

  let isClosing = false;
  let globalDispatchEvent;

  async function pollForMessages() {
    if (!globalDispatchEvent) {
      globalDispatchEvent = globalThis.dispatchEvent.bind(globalThis);
    }
    while (!isClosing) {
      const data = await core.opAsync("op_worker_recv_message");
      if (data === null) break;
      const v = deserializeJsMessageData(data);
      const message = v[0];
      const transfer = v[1];

      const msgEvent = new MessageEvent("message", {
        cancelable: false,
        data: message,
        ports: transfer,
      });

      try {
        if (globalThis.onmessage) {
          await globalThis.onmessage(msgEvent);
        }
        globalDispatchEvent(msgEvent);
      } catch (e) {
        let handled = false;

        const errorEvent = new ErrorEvent("error", {
          cancelable: true,
          message: e.message,
          lineno: e.lineNumber ? e.lineNumber + 1 : undefined,
          colno: e.columnNumber ? e.columnNumber + 1 : undefined,
          filename: e.fileName,
          error: null,
        });

        if (globalThis["onerror"]) {
          const ret = globalThis.onerror(
            e.message,
            e.fileName,
            e.lineNumber,
            e.columnNumber,
            e,
          );
          handled = ret === true;
        }

        globalDispatchEvent(errorEvent);
        if (errorEvent.defaultPrevented) {
          handled = true;
        }

        if (!handled) {
          core.opSync(
            "op_worker_unhandled_error",
            e.message,
          );
        }
      }
    }
  }

  function opMainModule() {
    return core.opSync("op_main_module");
  }

  function runtimeStart(runtimeOptions, source) {
    core.setMacrotaskCallback(timers.handleTimerMacrotask);
    version.setVersions(
      runtimeOptions.denoVersion,
      runtimeOptions.v8Version,
      runtimeOptions.tsVersion,
    );
    build.setBuildInfo(runtimeOptions.target);
    util.setLogDebug(runtimeOptions.debugFlag, source);
    // TODO(bartlomieju): a very crude way to disable
    // source mapping of errors. This condition is true
    // only for compiled standalone binaries.
    let prepareStackTrace;
    if (runtimeOptions.applySourceMaps) {
      prepareStackTrace = core.createPrepareStackTrace(
        errorStack.opApplySourceMap,
      );
    } else {
      prepareStackTrace = core.createPrepareStackTrace();
    }
    Error.prepareStackTrace = prepareStackTrace;
  }

  function registerErrors() {
    core.registerErrorClass("NotFound", errors.NotFound);
    core.registerErrorClass("PermissionDenied", errors.PermissionDenied);
    core.registerErrorClass("ConnectionRefused", errors.ConnectionRefused);
    core.registerErrorClass("ConnectionReset", errors.ConnectionReset);
    core.registerErrorClass("ConnectionAborted", errors.ConnectionAborted);
    core.registerErrorClass("NotConnected", errors.NotConnected);
    core.registerErrorClass("AddrInUse", errors.AddrInUse);
    core.registerErrorClass("AddrNotAvailable", errors.AddrNotAvailable);
    core.registerErrorClass("BrokenPipe", errors.BrokenPipe);
    core.registerErrorClass("AlreadyExists", errors.AlreadyExists);
    core.registerErrorClass("InvalidData", errors.InvalidData);
    core.registerErrorClass("TimedOut", errors.TimedOut);
    core.registerErrorClass("Interrupted", errors.Interrupted);
    core.registerErrorClass("WriteZero", errors.WriteZero);
    core.registerErrorClass("UnexpectedEof", errors.UnexpectedEof);
    core.registerErrorClass("BadResource", errors.BadResource);
    core.registerErrorClass("Http", errors.Http);
    core.registerErrorClass("Busy", errors.Busy);
    core.registerErrorClass("NotSupported", errors.NotSupported);
    core.registerErrorBuilder(
      "DOMExceptionOperationError",
      function DOMExceptionOperationError(msg) {
        return new DOMException(msg, "OperationError");
      },
    );
    core.registerErrorBuilder(
      "DOMExceptionQuotaExceededError",
      function DOMExceptionQuotaExceededError(msg) {
        return new DOMException(msg, "QuotaExceededError");
      },
    );
    core.registerErrorBuilder(
      "DOMExceptionNotSupportedError",
      function DOMExceptionNotSupportedError(msg) {
        return new DOMException(msg, "NotSupported");
      },
    );
    core.registerErrorBuilder(
      "DOMExceptionInvalidCharacterError",
      function DOMExceptionInvalidCharacterError(msg) {
        return new DOMException(msg, "InvalidCharacterError");
      },
    );
  }

  class Navigator {
    constructor() {
      webidl.illegalConstructor();
    }

    [Symbol.for("Deno.privateCustomInspect")](inspect) {
      return `${this.constructor.name} ${inspect({})}`;
    }
  }

  const navigator = webidl.createBranded(Navigator);

  Object.defineProperties(Navigator.prototype, {
    gpu: {
      configurable: true,
      enumerable: true,
      get() {
        webidl.assertBranded(this, Navigator);
        return webgpu.gpu;
      },
    },
  });

  class WorkerNavigator {
    constructor() {
      webidl.illegalConstructor();
    }

    [Symbol.for("Deno.privateCustomInspect")](inspect) {
      return `${this.constructor.name} ${inspect({})}`;
    }
  }

  const workerNavigator = webidl.createBranded(WorkerNavigator);

  Object.defineProperties(WorkerNavigator.prototype, {
    gpu: {
      configurable: true,
      enumerable: true,
      get() {
        webidl.assertBranded(this, WorkerNavigator);
        return webgpu.gpu;
      },
    },
  });

  // https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope
  const windowOrWorkerGlobalScope = {
    Blob: util.nonEnumerable(file.Blob),
    ByteLengthQueuingStrategy: util.nonEnumerable(
      streams.ByteLengthQueuingStrategy,
    ),
    CloseEvent: util.nonEnumerable(CloseEvent),
    CountQueuingStrategy: util.nonEnumerable(
      streams.CountQueuingStrategy,
    ),
    CustomEvent: util.nonEnumerable(CustomEvent),
    DOMException: util.nonEnumerable(DOMException),
    ErrorEvent: util.nonEnumerable(ErrorEvent),
    Event: util.nonEnumerable(Event),
    EventTarget: util.nonEnumerable(EventTarget),
    File: util.nonEnumerable(file.File),
    FileReader: util.nonEnumerable(fileReader.FileReader),
    FormData: util.nonEnumerable(formData.FormData),
    Headers: util.nonEnumerable(headers.Headers),
    MessageEvent: util.nonEnumerable(MessageEvent),
    Performance: util.nonEnumerable(performance.Performance),
    PerformanceEntry: util.nonEnumerable(performance.PerformanceEntry),
    PerformanceMark: util.nonEnumerable(performance.PerformanceMark),
    PerformanceMeasure: util.nonEnumerable(performance.PerformanceMeasure),
    ProgressEvent: util.nonEnumerable(ProgressEvent),
    ReadableStream: util.nonEnumerable(streams.ReadableStream),
    ReadableStreamDefaultReader: util.nonEnumerable(
      streams.ReadableStreamDefaultReader,
    ),
    Request: util.nonEnumerable(fetch.Request),
    Response: util.nonEnumerable(fetch.Response),
    TextDecoder: util.nonEnumerable(encoding.TextDecoder),
    TextEncoder: util.nonEnumerable(encoding.TextEncoder),
    TextDecoderStream: util.nonEnumerable(encoding.TextDecoderStream),
    TextEncoderStream: util.nonEnumerable(encoding.TextEncoderStream),
    TransformStream: util.nonEnumerable(streams.TransformStream),
    URL: util.nonEnumerable(url.URL),
    URLSearchParams: util.nonEnumerable(url.URLSearchParams),
    WebSocket: util.nonEnumerable(webSocket.WebSocket),
    BroadcastChannel: util.nonEnumerable(broadcastChannel.BroadcastChannel),
    MessageChannel: util.nonEnumerable(messagePort.MessageChannel),
    MessagePort: util.nonEnumerable(messagePort.MessagePort),
    Worker: util.nonEnumerable(worker.Worker),
    WritableStream: util.nonEnumerable(streams.WritableStream),
    WritableStreamDefaultWriter: util.nonEnumerable(
      streams.WritableStreamDefaultWriter,
    ),
    WritableStreamDefaultController: util.nonEnumerable(
      streams.WritableStreamDefaultController,
    ),
    ReadableByteStreamController: util.nonEnumerable(
      streams.ReadableByteStreamController,
    ),
    ReadableStreamDefaultController: util.nonEnumerable(
      streams.ReadableStreamDefaultController,
    ),
    TransformStreamDefaultController: util.nonEnumerable(
      streams.TransformStreamDefaultController,
    ),
    atob: util.writable(base64.atob),
    btoa: util.writable(base64.btoa),
    clearInterval: util.writable(timers.clearInterval),
    clearTimeout: util.writable(timers.clearTimeout),
    console: util.writable(
      new Console((msg, level) => core.print(msg, level > 1)),
    ),
    crypto: util.readOnly(crypto.crypto),
    Crypto: util.nonEnumerable(crypto.Crypto),
    SubtleCrypto: util.nonEnumerable(crypto.SubtleCrypto),
    fetch: util.writable(fetch.fetch),
    performance: util.writable(performance.performance),
    setInterval: util.writable(timers.setInterval),
    setTimeout: util.writable(timers.setTimeout),

    GPU: util.nonEnumerable(webgpu.GPU),
    GPUAdapter: util.nonEnumerable(webgpu.GPUAdapter),
    GPUAdapterLimits: util.nonEnumerable(webgpu.GPUAdapterLimits),
    GPUSupportedFeatures: util.nonEnumerable(webgpu.GPUSupportedFeatures),
    GPUDevice: util.nonEnumerable(webgpu.GPUDevice),
    GPUQueue: util.nonEnumerable(webgpu.GPUQueue),
    GPUBuffer: util.nonEnumerable(webgpu.GPUBuffer),
    GPUBufferUsage: util.nonEnumerable(webgpu.GPUBufferUsage),
    GPUMapMode: util.nonEnumerable(webgpu.GPUMapMode),
    GPUTexture: util.nonEnumerable(webgpu.GPUTexture),
    GPUTextureUsage: util.nonEnumerable(webgpu.GPUTextureUsage),
    GPUTextureView: util.nonEnumerable(webgpu.GPUTextureView),
    GPUSampler: util.nonEnumerable(webgpu.GPUSampler),
    GPUBindGroupLayout: util.nonEnumerable(webgpu.GPUBindGroupLayout),
    GPUPipelineLayout: util.nonEnumerable(webgpu.GPUPipelineLayout),
    GPUBindGroup: util.nonEnumerable(webgpu.GPUBindGroup),
    GPUShaderModule: util.nonEnumerable(webgpu.GPUShaderModule),
    GPUShaderStage: util.nonEnumerable(webgpu.GPUShaderStage),
    GPUComputePipeline: util.nonEnumerable(webgpu.GPUComputePipeline),
    GPURenderPipeline: util.nonEnumerable(webgpu.GPURenderPipeline),
    GPUColorWrite: util.nonEnumerable(webgpu.GPUColorWrite),
    GPUCommandEncoder: util.nonEnumerable(webgpu.GPUCommandEncoder),
    GPURenderPassEncoder: util.nonEnumerable(webgpu.GPURenderPassEncoder),
    GPUComputePassEncoder: util.nonEnumerable(webgpu.GPUComputePassEncoder),
    GPUCommandBuffer: util.nonEnumerable(webgpu.GPUCommandBuffer),
    GPURenderBundleEncoder: util.nonEnumerable(webgpu.GPURenderBundleEncoder),
    GPURenderBundle: util.nonEnumerable(webgpu.GPURenderBundle),
    GPUQuerySet: util.nonEnumerable(webgpu.GPUQuerySet),
    GPUOutOfMemoryError: util.nonEnumerable(webgpu.GPUOutOfMemoryError),
    GPUValidationError: util.nonEnumerable(webgpu.GPUValidationError),
  };

  // The console seems to be the only one that should be writable and non-enumerable
  // thus we don't have a unique helper for it. If other properties follow the same
  // structure, it might be worth it to define a helper in `util`
  windowOrWorkerGlobalScope.console.enumerable = false;

  const mainRuntimeGlobalProperties = {
    Location: location.locationConstructorDescriptor,
    location: location.locationDescriptor,
    Window: globalInterfaces.windowConstructorDescriptor,
    window: util.readOnly(globalThis),
    self: util.readOnly(globalThis),
    Navigator: util.nonEnumerable(Navigator),
    navigator: {
      configurable: true,
      enumerable: true,
      get: () => navigator,
    },
    // TODO(bartlomieju): from MDN docs (https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope)
    // it seems those two properties should be available to workers as well
    onload: util.writable(null),
    onunload: util.writable(null),
    close: util.writable(windowClose),
    closed: util.getterOnly(() => windowIsClosing),
    alert: util.writable(prompt.alert),
    confirm: util.writable(prompt.confirm),
    prompt: util.writable(prompt.prompt),
    localStorage: {
      configurable: true,
      enumerable: true,
      get: webStorage.localStorage,
    },
    sessionStorage: {
      configurable: true,
      enumerable: true,
      get: webStorage.sessionStorage,
    },
    Storage: util.nonEnumerable(webStorage.Storage),
  };

  const workerRuntimeGlobalProperties = {
    WorkerLocation: location.workerLocationConstructorDescriptor,
    location: location.workerLocationDescriptor,
    WorkerGlobalScope: globalInterfaces.workerGlobalScopeConstructorDescriptor,
    DedicatedWorkerGlobalScope:
      globalInterfaces.dedicatedWorkerGlobalScopeConstructorDescriptor,
    WorkerNavigator: util.nonEnumerable(WorkerNavigator),
    navigator: {
      configurable: true,
      enumerable: true,
      get: () => workerNavigator,
    },
    self: util.readOnly(globalThis),
    onmessage: util.writable(onmessage),
    onerror: util.writable(onerror),
    // TODO(bartlomieju): should be readonly?
    close: util.nonEnumerable(workerClose),
    postMessage: util.writable(postMessage),
  };

  let hasBootstrapped = false;

  function bootstrapMainRuntime(runtimeOptions) {
    if (hasBootstrapped) {
      throw new Error("Worker runtime already bootstrapped");
    }

    const consoleFromV8 = window.console;
    const wrapConsole = window.__bootstrap.console.wrapConsole;

    // Remove bootstrapping data from the global scope
    delete globalThis.__bootstrap;
    delete globalThis.bootstrap;
    util.log("bootstrapMainRuntime");
    hasBootstrapped = true;
    Object.defineProperties(globalThis, windowOrWorkerGlobalScope);
    Object.defineProperties(globalThis, mainRuntimeGlobalProperties);
    Object.setPrototypeOf(globalThis, Window.prototype);

    const consoleFromDeno = globalThis.console;
    wrapConsole(consoleFromDeno, consoleFromV8);

    eventTarget.setEventTargetData(globalThis);

    defineEventHandler(window, "load", null);
    defineEventHandler(window, "unload", null);

    const isUnloadDispatched = Symbol.for("isUnloadDispatched");
    // Stores the flag for checking whether unload is dispatched or not.
    // This prevents the recursive dispatches of unload events.
    // See https://github.com/denoland/deno/issues/9201.
    window[isUnloadDispatched] = false;
    window.addEventListener("unload", () => {
      window[isUnloadDispatched] = true;
    });

    runtimeStart(runtimeOptions);
    const {
      args,
      location: locationHref,
      noColor,
      pid,
      ppid,
      unstableFlag,
    } = runtimeOptions;

    if (locationHref != null) {
      location.setLocationHref(locationHref);
    }

    registerErrors();

    const internalSymbol = Symbol("Deno.internal");

    const finalDenoNs = {
      core,
      internal: internalSymbol,
      [internalSymbol]: internals,
      resources: core.resources,
      close: core.close,
      memoryUsage: core.memoryUsage,
      ...denoNs,
    };
    Object.defineProperties(finalDenoNs, {
      pid: util.readOnly(pid),
      ppid: util.readOnly(ppid),
      noColor: util.readOnly(noColor),
      args: util.readOnly(Object.freeze(args)),
      mainModule: util.getterOnly(opMainModule),
    });

    if (unstableFlag) {
      Object.assign(finalDenoNs, denoNsUnstable);
    }

    // Setup `Deno` global - we're actually overriding already existing global
    // `Deno` with `Deno` namespace from "./deno.ts".
    Object.defineProperty(globalThis, "Deno", util.readOnly(finalDenoNs));
    Object.freeze(globalThis.Deno.core);
    Object.freeze(globalThis.Deno.core.sharedQueue);
    signals.setSignals();

    util.log("args", args);
  }

  function bootstrapWorkerRuntime(
    runtimeOptions,
    name,
    useDenoNamespace,
    internalName,
  ) {
    if (hasBootstrapped) {
      throw new Error("Worker runtime already bootstrapped");
    }

    const consoleFromV8 = window.console;
    const wrapConsole = window.__bootstrap.console.wrapConsole;

    // Remove bootstrapping data from the global scope
    delete globalThis.__bootstrap;
    delete globalThis.bootstrap;
    util.log("bootstrapWorkerRuntime");
    hasBootstrapped = true;
    Object.defineProperties(globalThis, windowOrWorkerGlobalScope);
    Object.defineProperties(globalThis, workerRuntimeGlobalProperties);
    Object.defineProperties(globalThis, { name: util.readOnly(name) });
    Object.setPrototypeOf(globalThis, DedicatedWorkerGlobalScope.prototype);

    const consoleFromDeno = globalThis.console;
    wrapConsole(consoleFromDeno, consoleFromV8);

    eventTarget.setEventTargetData(globalThis);

    runtimeStart(
      runtimeOptions,
      internalName ?? name,
    );
    const { unstableFlag, pid, noColor, args, location: locationHref } =
      runtimeOptions;

    location.setLocationHref(locationHref);
    registerErrors();

    pollForMessages();

    const internalSymbol = Symbol("Deno.internal");

    const finalDenoNs = {
      core,
      internal: internalSymbol,
      [internalSymbol]: internals,
      resources: core.resources,
      close: core.close,
      ...denoNs,
    };
    if (useDenoNamespace) {
      if (unstableFlag) {
        Object.assign(finalDenoNs, denoNsUnstable);
      }
      Object.defineProperties(finalDenoNs, {
        pid: util.readOnly(pid),
        noColor: util.readOnly(noColor),
        args: util.readOnly(Object.freeze(args)),
      });
      // Setup `Deno` global - we're actually overriding already
      // existing global `Deno` with `Deno` namespace from "./deno.ts".
      util.immutableDefine(globalThis, "Deno", finalDenoNs);
      Object.freeze(globalThis.Deno);
      Object.freeze(globalThis.Deno.core);
      Object.freeze(globalThis.Deno.core.sharedQueue);
      signals.setSignals();
    } else {
      delete globalThis.Deno;
      util.assert(globalThis.Deno === undefined);
    }
  }

  Object.defineProperties(globalThis, {
    bootstrap: {
      value: {
        mainRuntime: bootstrapMainRuntime,
        workerRuntime: bootstrapWorkerRuntime,
      },
      configurable: true,
    },
  });
})(this);