stream: support typed arrays

Author: ilyasShabiCS

doc/api/stream.md

@@ -283,10 +283,10 @@ The `finished` API also provides a [callback version][stream-finished].
 ### Object mode
 
 All streams created by Node.js APIs operate exclusively on strings and `Buffer`
-(or `Uint8Array`) objects. It is possible, however, for stream implementations
-to work with other types of JavaScript values (with the exception of `null`,
-which serves a special purpose within streams). Such streams are considered to
-operate in "object mode".
+(or {TypedArray} and {DataView}) objects. It is possible, however, for stream
+implementations to work with other types of JavaScript values (with the
+exception of `null`, which serves a special purpose within streams).
+Such streams are considered to operate in "object mode".
 
 Stream instances are switched into object mode using the `objectMode` option
 when the stream is created. Attempting to switch an existing stream into
@@ -712,6 +712,9 @@ console.log(myStream.destroyed); // true
 <!-- YAML
 added: v0.9.4
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/51866
+    description: The `chunk` argument can now be a `TypedArray` or `DataView` instance.
   - version: v15.0.0
     pr-url: https://github.com/nodejs/node/pull/34101
     description: The `callback` is invoked before 'finish' or on error.
@@ -726,10 +729,10 @@ changes:
     description: The `chunk` argument can now be a `Uint8Array` instance.
 -->
 
-* `chunk` {string|Buffer|Uint8Array|any} Optional data to write. For streams
-  not operating in object mode, `chunk` must be a string, `Buffer` or
-  `Uint8Array`. For object mode streams, `chunk` may be any JavaScript value
-  other than `null`.
+* `chunk` {string|Buffer|TypedArray|DataView|any} Optional data to write. For
+  streams not operating in object mode, `chunk` must be a {string}, {Buffer},
+  {TypedArray} or {DataView}. For object mode streams, `chunk` may be any
+  JavaScript value other than `null`.
 * `encoding` {string} The encoding if `chunk` is a string
 * `callback` {Function} Callback for when the stream is finished.
 * Returns: {this}
@@ -926,6 +929,9 @@ Getter for the property `objectMode` of a given `Writable` stream.
 <!-- YAML
 added: v0.9.4
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/51866
+    description: The `chunk` argument can now be a `TypedArray` or `DataView` instance.
   - version: v8.0.0
     pr-url: https://github.com/nodejs/node/pull/11608
     description: The `chunk` argument can now be a `Uint8Array` instance.
@@ -935,10 +941,10 @@ changes:
                  considered invalid now, even in object mode.
 -->
 
-* `chunk` {string|Buffer|Uint8Array|any} Optional data to write. For streams
-  not operating in object mode, `chunk` must be a string, `Buffer` or
-  `Uint8Array`. For object mode streams, `chunk` may be any JavaScript value
-  other than `null`.
+* `chunk` {string|Buffer|TypedArray|DataView|any} Optional data to write. For
+  streams not operating in object mode, `chunk` must be a {string}, {Buffer},
+  {TypedArray} or {DataView}. For object mode streams, `chunk` may be any
+  JavaScript value other than `null`.
 * `encoding` {string|null} The encoding, if `chunk` is a string. **Default:** `'utf8'`
 * `callback` {Function} Callback for when this chunk of data is flushed.
 * Returns: {boolean} `false` if the stream wishes for the calling code to
@@ -1763,15 +1769,18 @@ setTimeout(() => {
 <!-- YAML
 added: v0.9.11
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/51866
+    description: The `chunk` argument can now be a `TypedArray` or `DataView` instance.
   - version: v8.0.0
     pr-url: https://github.com/nodejs/node/pull/11608
     description: The `chunk` argument can now be a `Uint8Array` instance.
 -->
 
-* `chunk` {Buffer|Uint8Array|string|null|any} Chunk of data to unshift onto the
-  read queue. For streams not operating in object mode, `chunk` must be a
-  string, `Buffer`, `Uint8Array`, or `null`. For object mode streams, `chunk`
-  may be any JavaScript value.
+* `chunk` {Buffer|TypedArray|DataView|string|null|any} Chunk of data to unshift
+  onto the read queue. For streams not operating in object mode, `chunk` must
+  be a {string}, {Buffer}, {TypedArray}, {DataView} or `null`.
+  For object mode streams, `chunk` may be any JavaScript value.
 * `encoding` {string} Encoding of string chunks. Must be a valid
   `Buffer` encoding, such as `'utf8'` or `'ascii'`.
 
@@ -3512,8 +3521,8 @@ changes:
     **Default:** `'utf8'`.
   * `objectMode` {boolean} Whether or not the
     [`stream.write(anyObj)`][stream-write] is a valid operation. When set,
-    it becomes possible to write JavaScript values other than string,
-    `Buffer` or `Uint8Array` if supported by the stream implementation.
+    it becomes possible to write JavaScript values other than string, {Buffer},
+    {TypedArray} or {DataView} if supported by the stream implementation.
     **Default:** `false`.
   * `emitClose` {boolean} Whether or not the stream should emit `'close'`
     after it has been destroyed. **Default:** `true`.
@@ -4062,22 +4071,25 @@ It can be overridden by child classes but it **must not** be called directly.
 
 <!-- YAML
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/51866
+    description: The `chunk` argument can now be a `TypedArray` or `DataView` instance.
   - version: v8.0.0
     pr-url: https://github.com/nodejs/node/pull/11608
     description: The `chunk` argument can now be a `Uint8Array` instance.
 -->
 
-* `chunk` {Buffer|Uint8Array|string|null|any} Chunk of data to push into the
-  read queue. For streams not operating in object mode, `chunk` must be a
-  string, `Buffer` or `Uint8Array`. For object mode streams, `chunk` may be
-  any JavaScript value.
+* `chunk` {Buffer|TypedArray|DataView|string|null|any} Chunk of data to push
+  into the read queue. For streams not operating in object mode, `chunk` must
+  be a {string}, {Buffer}, {TypedArray} or {DataView}. For object mode streams,
+  `chunk` may be any JavaScript value.
 * `encoding` {string} Encoding of string chunks. Must be a valid
   `Buffer` encoding, such as `'utf8'` or `'ascii'`.
 * Returns: {boolean} `true` if additional chunks of data may continue to be
   pushed; `false` otherwise.
 
-When `chunk` is a `Buffer`, `Uint8Array`, or `string`, the `chunk` of data will
-be added to the internal queue for users of the stream to consume.
+When `chunk` is a {Buffer}, {TypedArray}, {DataView} or {string}, the `chunk`
+of data will be added to the internal queue for users of the stream to consume.
 Passing `chunk` as `null` signals the end of the stream (EOF), after which no
 more data can be written.
 
@@ -4752,8 +4764,9 @@ situations within Node.js where this is done, particularly in the
 
 Use of `readable.push('')` is not recommended.
 
-Pushing a zero-byte string, `Buffer`, or `Uint8Array` to a stream that is not in
-object mode has an interesting side effect. Because it _is_ a call to
+Pushing a zero-byte {string}, {Buffer}, {TypedArray} or {DataView} to a stream
+that is not in object mode has an interesting side effect.
+Because it _is_ a call to
 [`readable.push()`][stream-push], the call will end the reading process.
 However, because the argument is an empty string, no data is added to the
 readable buffer so there is nothing for a user to consume.

lib/internal/streams/readable.js

@@ -36,6 +36,7 @@ const {
   SymbolAsyncIterator,
   SymbolSpecies,
   TypedArrayPrototypeSet,
+  Uint8Array,
 } = primordials;
 
 module.exports = Readable;
@@ -420,11 +421,12 @@ function readableAddChunkUnshiftByteMode(stream, state, chunk, encoding) {
         chunk = Buffer.from(chunk, encoding);
       }
     }
-  } else if (Stream._isUint8Array(chunk)) {
-    chunk = Stream._uint8ArrayToBuffer(chunk);
+  } else if (Stream._isArrayBufferView(chunk)) {
+    const array = new Uint8Array(chunk.buffer, chunk.byteOffset, chunk.byteLength);
+    chunk = Stream._uint8ArrayToBuffer(array);
   } else if (chunk !== undefined && !(chunk instanceof Buffer)) {
     errorOrDestroy(stream, new ERR_INVALID_ARG_TYPE(
-      'chunk', ['string', 'Buffer', 'Uint8Array'], chunk));
+      'chunk', ['string', 'Buffer', 'TypedArray', 'DataView'], chunk));
     return false;
   }
 
@@ -473,12 +475,13 @@ function readableAddChunkPushByteMode(stream, state, chunk, encoding) {
     }
   } else if (chunk instanceof Buffer) {
     encoding = '';
-  } else if (Stream._isUint8Array(chunk)) {
-    chunk = Stream._uint8ArrayToBuffer(chunk);
+  } else if (Stream._isArrayBufferView(chunk)) {
+    const array = new Uint8Array(chunk.buffer, chunk.byteOffset, chunk.byteLength);
+    chunk = Stream._uint8ArrayToBuffer(array);
     encoding = '';
   } else if (chunk !== undefined) {
     errorOrDestroy(stream, new ERR_INVALID_ARG_TYPE(
-      'chunk', ['string', 'Buffer', 'Uint8Array'], chunk));
+      'chunk', ['string', 'Buffer', 'TypedArray', 'DataView'], chunk));
     return false;
   }
 

lib/internal/streams/writable.js

@@ -35,6 +35,7 @@ const {
   StringPrototypeToLowerCase,
   Symbol,
   SymbolHasInstance,
+  Uint8Array,
 } = primordials;
 
 module.exports = Writable;
@@ -467,12 +468,13 @@ function _write(stream, chunk, encoding, cb) {
       }
     } else if (chunk instanceof Buffer) {
       encoding = 'buffer';
-    } else if (Stream._isUint8Array(chunk)) {
-      chunk = Stream._uint8ArrayToBuffer(chunk);
+    } else if (Stream._isArrayBufferView(chunk)) {
+      const array = new Uint8Array(chunk.buffer, chunk.byteOffset, chunk.byteLength);
+      chunk = Stream._uint8ArrayToBuffer(array);
       encoding = 'buffer';
     } else {
       throw new ERR_INVALID_ARG_TYPE(
-        'chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
+        'chunk', ['string', 'Buffer', 'TypedArray', 'DataView'], chunk);
     }
   }
 

lib/stream.js

@@ -50,6 +50,7 @@ const internalBuffer = require('internal/buffer');
 
 const promises = require('stream/promises');
 const utils = require('internal/streams/utils');
+const { isArrayBufferView, isUint8Array } = require('internal/util/types');
 
 const Stream = module.exports = require('internal/streams/legacy').Stream;
 
@@ -137,7 +138,8 @@ ObjectDefineProperty(eos, customPromisify, {
 // Backwards-compat with node 0.4.x
 Stream.Stream = Stream;
 
-Stream._isUint8Array = require('internal/util/types').isUint8Array;
+Stream._isArrayBufferView = isArrayBufferView;
+Stream._isUint8Array = isUint8Array;
 Stream._uint8ArrayToBuffer = function _uint8ArrayToBuffer(chunk) {
   return new internalBuffer.FastBuffer(chunk.buffer,
                                        chunk.byteOffset,

test/parallel/test-net-write-arguments.js

@@ -34,6 +34,6 @@ assert.throws(() => {
     code: 'ERR_INVALID_ARG_TYPE',
     name: 'TypeError',
     message: 'The "chunk" argument must be of type string or an instance of ' +
-              `Buffer or Uint8Array.${common.invalidArgTypeHelper(value)}`
+              `Buffer, TypedArray, or DataView.${common.invalidArgTypeHelper(value)}`
   });
 });

test/parallel/test-stream-typedarray.js

@@ -0,0 +1,105 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+
+const { Readable, Writable } = require('stream');
+
+const buffer = Buffer.from('ABCD');
+const views = common.getArrayBufferViews(buffer);
+
+{
+  // Simple Writable test.
+  let n = 0;
+  const writable = new Writable({
+    write: common.mustCall((chunk, encoding, cb) => {
+      assert(chunk instanceof Buffer);
+      assert(ArrayBuffer.isView(chunk));
+      assert.deepStrictEqual(common.getBufferSources(chunk)[n], views[n]);
+      n++;
+      cb();
+    }, views.length),
+  });
+
+  views.forEach((msg) => writable.write(msg));
+  writable.end();
+}
+
+{
+  // Writable test with object mode True.
+  let n = 0;
+  const writable = new Writable({
+    objectMode: true,
+    write: common.mustCall((chunk, encoding, cb) => {
+      assert(!(chunk instanceof Buffer));
+      assert(ArrayBuffer.isView(chunk));
+      assert.deepStrictEqual(common.getBufferSources(chunk)[n], views[n]);
+      n++;
+      cb();
+    }, views.length),
+  });
+
+  views.forEach((msg) => writable.write(msg));
+  writable.end();
+}
+
+
+{
+  // Writable test, multiple writes carried out via writev.
+  let n = 0;
+  let callback;
+  const writable = new Writable({
+    write: common.mustCall((chunk, encoding, cb) => {
+      assert(chunk instanceof Buffer);
+      assert(ArrayBuffer.isView(chunk));
+      assert.deepStrictEqual(common.getBufferSources(chunk)[n], views[n]);
+      n++;
+      callback = cb;
+    }),
+
+    writev: common.mustCall((chunks, cb) => {
+      assert.strictEqual(chunks.length, views.length);
+      let res = '';
+      for (const chunk of chunks) {
+        assert.strictEqual(chunk.encoding, 'buffer');
+        res += chunk.chunk;
+      }
+      assert.strictEqual(res, 'ABCD'.repeat(9));
+    }),
+
+  });
+  views.forEach((msg) => writable.write(msg));
+  writable.end(views[0]);
+  callback();
+}
+
+
+{
+  // Simple Readable test.
+  const readable = new Readable({
+    read() {}
+  });
+
+  readable.push(views[1]);
+  readable.push(views[2]);
+  readable.unshift(views[0]);
+
+  const buf = readable.read();
+  assert(buf instanceof Buffer);
+  assert.deepStrictEqual([...buf], [...views[0], ...views[1], ...views[2]]);
+}
+
+{
+  // Readable test, setEncoding.
+  const readable = new Readable({
+    read() {}
+  });
+
+  readable.setEncoding('utf8');
+
+  readable.push(views[1]);
+  readable.push(views[2]);
+  readable.unshift(views[0]);
+
+  const out = readable.read();
+  assert.strictEqual(out, 'ABCD'.repeat(3));
+}