Eric Traut 72f757d144 Increase app-server WebSocket outbound buffer (#19246)
Fixes #18203.

## Why

Remote TUI clients connected through `codex app-server --listen
ws://...` can receive short bursts of outbound turn and tool-output
notifications. The WebSocket transport previously used the shared
128-message channel capacity for its outbound writer queue, so a healthy
client that briefly lagged during normal output streaming could fill the
queue and be disconnected immediately.

This is a smaller mitigation than #18265: instead of adding a new
overflow/backpressure pipeline, keep the existing non-blocking router
behavior and give WebSocket clients enough bounded headroom for
realistic bursts.

## What Changed

- Added a WebSocket-only outbound writer capacity of `64 * 1024`
messages.
- Used that larger capacity only for the WebSocket data writer queue in
`codex-rs/app-server/src/transport/websocket.rs`.
- Left the shared `CHANNEL_CAPACITY` and the existing disconnect-on-full
behavior unchanged for internal/control channels and genuinely stuck
clients.

## Verification

- `cargo test -p codex-app-server
transport::tests::broadcast_does_not_block_on_slow_connection`
- Manually retried the #18203 repro prompt against the remote TUI and
confirmed it stayed connected.
72f757d144 · 2026-04-23 18:47:28 -07:00
5,752 Commits
2026-04-14 01:45:41 +00:00
2026-03-26 16:50:07 -07:00
2025-04-16 12:56:08 -04:00
2025-04-16 12:56:08 -04:00
2026-04-22 11:46:11 +01:00
2026-04-07 10:55:58 -07:00

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