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Diffstat (limited to 'ext/node/polyfills/_util/_util_callbackify.js')
-rw-r--r-- | ext/node/polyfills/_util/_util_callbackify.js | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/ext/node/polyfills/_util/_util_callbackify.js b/ext/node/polyfills/_util/_util_callbackify.js new file mode 100644 index 000000000..cb30f7915 --- /dev/null +++ b/ext/node/polyfills/_util/_util_callbackify.js @@ -0,0 +1,91 @@ +// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license. +// +// Adapted from Node.js. Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +// These are simplified versions of the "real" errors in Node. + +import { primordials } from "ext:core/mod.js"; +const { + ArrayPrototypePop, + Error, + FunctionPrototypeBind, + ReflectApply, + ObjectDefineProperties, + ObjectGetOwnPropertyDescriptors, + ObjectSetPrototypeOf, + ObjectValues, + PromisePrototypeThen, +} = primordials; + +import { nextTick } from "ext:deno_node/_next_tick.ts"; +import { validateFunction } from "ext:deno_node/internal/validators.mjs"; + +class NodeFalsyValueRejectionError extends Error { + code = "ERR_FALSY_VALUE_REJECTION"; + constructor(reason) { + super("Promise was rejected with falsy value"); + this.reason = reason; + } +} + +function callbackify(original) { + validateFunction(original, "original"); + + // We DO NOT return the promise as it gives the user a false sense that + // the promise is actually somehow related to the callback's execution + // and that the callback throwing will reject the promise. + function callbackified(...args) { + const maybeCb = ArrayPrototypePop(args); + validateFunction(maybeCb, "last argument"); + const cb = FunctionPrototypeBind(maybeCb, this); + // In true node style we process the callback on `nextTick` with all the + // implications (stack, `uncaughtException`, `async_hooks`) + PromisePrototypeThen( + ReflectApply(original, this, args), + (ret) => nextTick(cb, null, ret), + (rej) => { + rej = rej || new NodeFalsyValueRejectionError(rej); + return nextTick(cb, rej); + }, + ); + } + + const descriptors = ObjectGetOwnPropertyDescriptors(original); + // It is possible to manipulate a functions `length` or `name` property. This + // guards against the manipulation. + if (typeof descriptors.length.value === "number") { + descriptors.length.value++; + } + if (typeof descriptors.name.value === "string") { + descriptors.name.value += "Callbackified"; + } + const propertiesValues = ObjectValues(descriptors); + for (let i = 0; i < propertiesValues.length; i++) { + // We want to use null-prototype objects to not rely on globally mutable + // %Object.prototype%. + ObjectSetPrototypeOf(propertiesValues[i], null); + } + ObjectDefineProperties(callbackified, descriptors); + return callbackified; +} + +export { callbackify }; |