Bug 167786 – [Readable Streams API] Implement ReadableByteStreamController enqueue()

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Romain Bellessort]

Implement ReadableByteStreamController enqueue() method

[Romain Bellessort]

Created attachment 300525 [details]
Patch

[Romain Bellessort]

Proposed patch implements enqueue(), except regarding the step which declares that buffer should be transferred to current realm (step 7 in https://streams.spec.whatwg.org/#readable-byte-stream-controller-enqueue). I wasn't sure about what should be done there and I have isolated this in a dedicated function for a follow up patch. Conceptually, I understand the transfer operation, but I don't really get how it applies here: does it consist in making the buffer data accessible only to the ReadableStream module? (and not to the context calling enqueue())

[youenn fablet]

Comment on attachment 300525 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=300525&action=review

> Source/WebCore/Modules/streams/ReadableByteStreamInternals.js:282
> +    // For the moment, simply return received buffer.

The goal is to enable transfer from one thread (worker) to another (main thread/window).
I would guess there is already support in our codebase for that.

> Source/WebCore/Modules/streams/ReadableByteStreamInternals.js:305
> +        }

Return early here.

> Source/WebCore/Modules/streams/ReadableByteStreamInternals.js:309
> +        @throwTypeError("ReadableByteStreamController enqueue operation has no support for BYOB reader");

Here as well.

[Romain Bellessort]

Created attachment 300722 [details]
Patch

[Romain Bellessort]

(In reply to comment #3)
> Comment on attachment 300525 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=300525&action=review
> 
> > Source/WebCore/Modules/streams/ReadableByteStreamInternals.js:282
> > +    // For the moment, simply return received buffer.
> 
> The goal is to enable transfer from one thread (worker) to another (main
> thread/window).
> I would guess there is already support in our codebase for that.

Ok, I will further investigate the codebase then.

> > Source/WebCore/Modules/streams/ReadableByteStreamInternals.js:305
> > +        }
> 
> Return early here.
> 
> > Source/WebCore/Modules/streams/ReadableByteStreamInternals.js:309
> > +        @throwTypeError("ReadableByteStreamController enqueue operation has no support for BYOB reader");
> 
> Here as well.

Fixed in new patch.

[WebKit Commit Bot]

Comment on attachment 300722 [details]
Patch

Clearing flags on attachment: 300722

Committed r211779: <http://trac.webkit.org/changeset/211779>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.