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stream: move duplicated code to an internal module
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Create a utils module for isIterable(), isReadable(), and isStream().

PR-URL: #37508
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Robert Nagy <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
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Trott authored and targos committed Feb 28, 2021
1 parent 46af567 commit 4cc7645
Showing 5 changed files with 45 additions and 43 deletions.
27 changes: 6 additions & 21 deletions lib/internal/streams/pipeline.js
Original file line number Diff line number Diff line change
@@ -7,7 +7,6 @@ const {
ArrayIsArray,
ReflectApply,
SymbolAsyncIterator,
SymbolIterator,
} = primordials;

let eos;
@@ -23,6 +22,12 @@ const {

const { validateCallback } = require('internal/validators');

const {
isIterable,
isReadable,
isStream,
} = require('internal/streams/utils');

let EE;
let PassThrough;
let Readable;
@@ -78,26 +83,6 @@ function popCallback(streams) {
return streams.pop();
}

function isReadable(obj) {
return !!(obj && typeof obj.pipe === 'function');
}

function isWritable(obj) {
return !!(obj && typeof obj.write === 'function');
}

function isStream(obj) {
return isReadable(obj) || isWritable(obj);
}

function isIterable(obj, isAsync) {
if (!obj) return false;
if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
return typeof obj[SymbolAsyncIterator] === 'function' ||
typeof obj[SymbolIterator] === 'function';
}

function makeAsyncIterable(val) {
if (isIterable(val)) {
return val;
32 changes: 32 additions & 0 deletions lib/internal/streams/utils.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
'use strict';

const {
SymbolAsyncIterator,
SymbolIterator,
} = primordials;

function isReadable(obj) {
return !!(obj && typeof obj.pipe === 'function');
}

function isWritable(obj) {
return !!(obj && typeof obj.write === 'function');
}

function isStream(obj) {
return isReadable(obj) || isWritable(obj);
}

function isIterable(obj, isAsync) {
if (!obj) return false;
if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
return typeof obj[SymbolAsyncIterator] === 'function' ||
typeof obj[SymbolIterator] === 'function';
}

module.exports = {
isIterable,
isReadable,
isStream,
};
27 changes: 5 additions & 22 deletions lib/stream/promises.js
Original file line number Diff line number Diff line change
@@ -3,8 +3,6 @@
const {
ArrayPrototypePop,
Promise,
SymbolAsyncIterator,
SymbolIterator,
} = primordials;

const {
@@ -15,29 +13,14 @@ const {
validateAbortSignal,
} = require('internal/validators');

const {
isIterable,
isStream,
} = require('internal/streams/utils');

let pl;
let eos;

function isReadable(obj) {
return !!(obj && typeof obj.pipe === 'function');
}

function isWritable(obj) {
return !!(obj && typeof obj.write === 'function');
}

function isStream(obj) {
return isReadable(obj) || isWritable(obj);
}

function isIterable(obj, isAsync) {
if (!obj) return false;
if (isAsync === true) return typeof obj[SymbolAsyncIterator] === 'function';
if (isAsync === false) return typeof obj[SymbolIterator] === 'function';
return typeof obj[SymbolAsyncIterator] === 'function' ||
typeof obj[SymbolIterator] === 'function';
}

function pipeline(...streams) {
if (!pl) pl = require('internal/streams/pipeline');
return new Promise((resolve, reject) => {
1 change: 1 addition & 0 deletions node.gyp
Original file line number Diff line number Diff line change
@@ -256,6 +256,7 @@
'lib/internal/streams/state.js',
'lib/internal/streams/pipeline.js',
'lib/internal/streams/end-of-stream.js',
'lib/internal/streams/utils.js',
'deps/v8/tools/splaytree.js',
'deps/v8/tools/codemap.js',
'deps/v8/tools/consarray.js',
1 change: 1 addition & 0 deletions test/parallel/test-bootstrap-modules.js
Original file line number Diff line number Diff line change
@@ -98,6 +98,7 @@ const expectedModules = new Set([
'NativeModule internal/streams/readable',
'NativeModule internal/streams/state',
'NativeModule internal/streams/transform',
'NativeModule internal/streams/utils',
'NativeModule internal/streams/writable',
'NativeModule internal/timers',
'NativeModule internal/url',

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