tree d3b595514ffc81cba91a4f69a4be20c4c35fc51a
parent aba74ffb31ba77be0a7ffd7c981286b1aeaa28e0
author vasilvv <vasilvv@google.com> 1673626073 -0800
committer Copybara-Service <copybara-worker@google.com> 1673626126 -0800

Provide an abstract API for a stream that one can write bytes into.

For QUIC, we have a QuicPacketWriter as an API for outputting all datagrams used by the QUIC connection; since encapsulated WebTransport (aka WebTransport over HTTP/2) has a single bytestream as an output, we need a similar type for that.

This CL takes the existing WebTransport stream write API, cleans it up, and moves it into its own class.

Notable changes to the write API:
- Make it vectorized
- Let it return a status object instead of simple true/false
- Merge writing and sending fin into a single method, the same way as existing QUIC APIs work

Parts of the old API are still kept around for compatibility with existing calls.

PiperOrigin-RevId: 501849717