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c6bf07ec6d
In the implementation of structured serialization in `Deno.core.serialize`, whenever there is a serialization error, an exception will be thrown with the message "Failed to serialize response", even though V8 provides a message to use in such cases. This change instead throws an exception with the V8-provided message, if there is one.
87 lines
2.5 KiB
JavaScript
87 lines
2.5 KiB
JavaScript
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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// @ts-check
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/// <reference path="../../core/lib.deno_core.d.ts" />
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/// <reference path="../../core/internal.d.ts" />
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/// <reference path="../web/internal.d.ts" />
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/// <reference path="../web/lib.deno_web.d.ts" />
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"use strict";
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((window) => {
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const core = window.Deno.core;
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const { DOMException } = window.__bootstrap.domException;
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const {
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ArrayBuffer,
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ArrayBufferPrototype,
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ArrayBufferIsView,
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DataViewPrototype,
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ObjectPrototypeIsPrototypeOf,
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TypedArrayPrototypeSlice,
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TypeErrorPrototype,
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WeakMap,
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WeakMapPrototypeSet,
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} = window.__bootstrap.primordials;
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const objectCloneMemo = new WeakMap();
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function cloneArrayBuffer(
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srcBuffer,
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srcByteOffset,
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srcLength,
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_cloneConstructor,
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) {
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// this function fudges the return type but SharedArrayBuffer is disabled for a while anyway
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return TypedArrayPrototypeSlice(
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srcBuffer,
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srcByteOffset,
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srcByteOffset + srcLength,
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);
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}
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/** Clone a value in a similar way to structured cloning. It is similar to a
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* StructureDeserialize(StructuredSerialize(...)). */
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function structuredClone(value) {
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// Performance optimization for buffers, otherwise
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// `serialize/deserialize` will allocate new buffer.
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if (ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, value)) {
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const cloned = cloneArrayBuffer(
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value,
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0,
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value.byteLength,
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ArrayBuffer,
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);
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WeakMapPrototypeSet(objectCloneMemo, value, cloned);
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return cloned;
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}
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if (ArrayBufferIsView(value)) {
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const clonedBuffer = structuredClone(value.buffer);
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// Use DataViewConstructor type purely for type-checking, can be a
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// DataView or TypedArray. They use the same constructor signature,
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// only DataView has a length in bytes and TypedArrays use a length in
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// terms of elements, so we adjust for that.
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let length;
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if (ObjectPrototypeIsPrototypeOf(DataViewPrototype, view)) {
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length = value.byteLength;
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} else {
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length = value.length;
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}
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return new (value.constructor)(
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clonedBuffer,
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value.byteOffset,
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length,
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);
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}
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try {
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return core.deserialize(core.serialize(value));
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} catch (e) {
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if (ObjectPrototypeIsPrototypeOf(TypeErrorPrototype, e)) {
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throw new DOMException(e.message, "DataCloneError");
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}
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throw e;
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}
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}
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window.__bootstrap.structuredClone = structuredClone;
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})(globalThis);
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