tree 0ff0f3443f1c5bd5f64124b51f17a7261e6a4e7d
parent 0b45284ce1c9ee97132f4a64d1208365e745de9b
author birenroy <birenroy@google.com> 1715803160 -0700
committer Copybara-Service <copybara-worker@google.com> 1715803233 -0700

Introduces new `Http2VisitorInterface` methods for DATA frame generation.

An outline of changes:
* Adds `Http2VisitorInterface::OnReadyToSendDataForStream()`, which the codec calls when it is ready to send a `DATA` frame; the visitor implementation indicates how many bytes can be sent in this frame.
* Adds `Http2VisitorInterface::SendDataFrame()`, which the codec calls with a frame header; the visitor implementation should send the frame header and then the indicated number of payload bytes.
* Replaces the existing "data provider" implementation with one that calls back through `NgHttp2Adapter`. This allows the adapter to forward the read callback to a `DataFrameSource`, if present for the stream, or to the visitor implementation otherwise.

This change brings the QUICHE `oghttp2` API more in line with its predecessor. Library users can continue to use the old behavior for now by passing a `DataFrameSource` to `SubmitRequest()`/`SubmitResponse()`.

At some point in the future, the `DataFrameSource` parameter will be removed, and all library users will have to use the new behavior.

PiperOrigin-RevId: 634047735