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util: increase function length when using callbackify()

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The returned function from `util.callbackify()` should increase the
`length` property by one due to the added callback.

PR-URL: https://github.com/nodejs/node/pull/26893
Fixes: https://github.com/nodejs/node/issues/26890
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
This commit is contained in:
Ruben Bridgewater 2019-03-24 21:59:20 +01:00
parent b1094dbe19
commit 61d1334e5b
No known key found for this signature in database
GPG Key ID: F07496B3EB3C1762
2 changed files with 17 additions and 2 deletions
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9
lib/util.js
View File

@ -195,8 +195,13 @@ function callbackify(original) {
}
Object.setPrototypeOf(callbackified, Object.getPrototypeOf(original));
Object.defineProperties(callbackified,
Object.getOwnPropertyDescriptors(original));
const descriptors = Object.getOwnPropertyDescriptors(original);
// It is possible to manipulate a functions `length` property. This guards
// against the manipulation.
if (typeof descriptors.length.value === 'number') {
descriptors.length.value++;
}
Object.defineProperties(callbackified, descriptors);
return callbackified;
}

10
test/parallel/test-util-callbackify.js
View File

@ -74,6 +74,7 @@ const values = [
}
const cbAsyncFn = callbackify(asyncFn);
assert.strictEqual(cbAsyncFn.length, 1);
cbAsyncFn(common.mustCall((err, ret) => {
assert.strictEqual(ret, undefined);
if (err instanceof Error) {
@ -146,6 +147,7 @@ const values = [
}
const cbAsyncFn = callbackify(asyncFn);
assert.strictEqual(cbAsyncFn.length, 2);
cbAsyncFn(value, common.mustCall((err, ret) => {
assert.ifError(err);
assert.strictEqual(ret, value);
@ -155,8 +157,16 @@ const values = [
assert.strictEqual(arg, value);
return Promise.resolve(arg);
}
const obj = {};
Object.defineProperty(promiseFn, 'length', {
value: obj,
writable: false,
enumerable: false,
configurable: true
});
const cbPromiseFn = callbackify(promiseFn);
assert.strictEqual(promiseFn.length, obj);
cbPromiseFn(value, common.mustCall((err, ret) => {
assert.ifError(err);
assert.strictEqual(ret, value);