stream: fix ReadableStreamReader.releaseLock()

Signed-off-by: Daeyeon Jeong daeyeon.dev@gmail.com
PR-URL: #44292
Refs: https://streams.spec.whatwg.org/#default-reader-release-lock
Refs: https://streams.spec.whatwg.org/#byob-reader-release-lock
Refs: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader/releaseLock
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Author: daeyeon

lib/internal/webstreams/readablestream.js

@@ -809,11 +809,7 @@ class ReadableStreamDefaultReader {
       throw new ERR_INVALID_THIS('ReadableStreamDefaultReader');
     if (this[kState].stream === undefined)
       return;
-    if (this[kState].readRequests.length) {
-      throw new ERR_INVALID_STATE.TypeError(
-        'Cannot release with pending read requests');
-    }
-    readableStreamReaderGenericRelease(this);
+    readableStreamDefaultReaderRelease(this);
   }
 
   /**
@@ -930,11 +926,7 @@ class ReadableStreamBYOBReader {
       throw new ERR_INVALID_THIS('ReadableStreamBYOBReader');
     if (this[kState].stream === undefined)
       return;
-    if (this[kState].readIntoRequests.length) {
-      throw new ERR_INVALID_STATE.TypeError(
-        'Cannot release with pending read requests');
-    }
-    readableStreamReaderGenericRelease(this);
+    readableStreamBYOBReaderRelease(this);
   }
 
   /**
@@ -1730,6 +1722,36 @@ function readableStreamReaderGenericInitialize(reader, stream) {
   }
 }
 
+function readableStreamDefaultReaderRelease(reader) {
+  readableStreamReaderGenericRelease(reader);
+  readableStreamDefaultReaderErrorReadRequests(
+    reader,
+    new ERR_INVALID_STATE.TypeError('Releasing reader')
+  );
+}
+
+function readableStreamDefaultReaderErrorReadRequests(reader, e) {
+  for (let n = 0; n < reader[kState].readRequests.length; ++n) {
+    reader[kState].readRequests[n][kError](e);
+  }
+  reader[kState].readRequests = [];
+}
+
+function readableStreamBYOBReaderRelease(reader) {
+  readableStreamReaderGenericRelease(reader);
+  readableStreamBYOBReaderErrorReadIntoRequests(
+    reader,
+    new ERR_INVALID_STATE.TypeError('Releasing reader')
+  );
+}
+
+function readableStreamBYOBReaderErrorReadIntoRequests(reader, e) {
+  for (let n = 0; n < reader[kState].readIntoRequests.length; ++n) {
+    reader[kState].readIntoRequests[n][kError](e);
+  }
+  reader[kState].readIntoRequests = [];
+}
+
 function readableStreamReaderGenericRelease(reader) {
   const {
     stream,

test/parallel/test-whatwg-readablestream.js

@@ -328,28 +328,18 @@ assert.throws(() => {
   const read1 = reader.read();
   const read2 = reader.read();
 
-  // The stream is empty so the read will never settle.
-  read1.then(
-    common.mustNotCall(),
-    common.mustNotCall()
-  );
-
-  // The stream is empty so the read will never settle.
-  read2.then(
-    common.mustNotCall(),
-    common.mustNotCall()
-  );
+  read1.then(common.mustNotCall(), common.mustCall());
+  read2.then(common.mustNotCall(), common.mustCall());
 
   assert.notStrictEqual(read1, read2);
 
   assert.strictEqual(reader[kState].readRequests.length, 2);
 
   delay().then(common.mustCall());
 
-  assert.throws(() => reader.releaseLock(), {
-    code: 'ERR_INVALID_STATE',
-  });
   assert(stream.locked);
+  reader.releaseLock();
+  assert(!stream.locked);
 }
 
 {

test/wpt/status/streams.json

@@ -31,9 +31,6 @@
   "readable-byte-streams/general.any.js": {
     "fail": {
       "expected": [
-        "ReadableStream with byte source: releaseLock() on ReadableStreamDefaultReader must reject pending read()",
-        "ReadableStream with byte source: releaseLock() on ReadableStreamBYOBReader must reject pending read()",
-        "pull() resolving should not resolve read()",
         "ReadableStream with byte source: enqueue() discards auto-allocated BYOB request",
         "ReadableStream with byte source: releaseLock() with pending read(view), read(view) on second reader, respond()",
         "ReadableStream with byte source: releaseLock() with pending read(view), read(view) on second reader with 1 element Uint16Array, respond(1)",
@@ -87,20 +84,6 @@
   "readable-streams/cross-realm-crash.window.js": {
     "skip": "Browser-specific test"
   },
-  "readable-streams/default-reader.any.js": {
-    "fail": {
-      "expected": [
-        "Second reader can read chunks after first reader was released with pending read requests"
-      ]
-    }
-  },
-  "readable-streams/templated.any.js": {
-    "fail": {
-      "expected": [
-        "ReadableStream (empty) reader: releasing the lock should reject all pending read requests"
-      ]
-    }
-  },
   "transferable/deserialize-error.window.js": {
     "skip": "Browser-specific test"
   },