dangernoodle-io / breadboard / 29631937196

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github

feat: add bb_data_http EVENT push path (ring + per-client cursor + backpressure) (#922)

Implements B1-1033 PR-3: a single shared bb_queue ring fed by EVENT-kind
attached keys, drained independently by each client's own event_cursor
each sweep_step(), respecting topic_filter. Append-only -- unlike STATE's
coalesced dirty-mask, every detected generation change on an EVENT key
produces at most one ring push, retried on render_fn failure exactly like
STATE's clear-only-on-success contract.

A slow client's own outbound queue filling up never blocks or affects any
other client: the event is dropped for that client only (never evicted
from the shared ring), its per-client dropped counter increments, and a
"dropped:N" marker frame is queued for it as soon as outbound has room
again. A ring-level wrap (more EVENT keys bump in one sweep than the
shared ring holds) is handled the same way -- the whole evicted gap counts
as dropped and the client's cursor fast-forwards to the ring's new head.

bb_data_http_cfg_t gains event_ring_capacity (shrink-only override,
mirrors max_clients); bb_data_http_client_dropped_count() is the new
public diagnostic getter.


Claude-Session: https://claude.ai/code/session_01VA9XvWjJcbAUGCZpSFfp3H

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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