Widening pass over the whole adapter following the cluster-C16 audit
(#51019, #51097, #23676, #23375): every in-memory structure that
accumulates per-message, per-user, or per-thread state is now bounded,
and every eviction is oldest-first — never arbitrary set-iteration
order, which is the #51019 failure mode (bot silently going quiet on
the most ACTIVE thread because set.pop-order eviction removed it).
Newly bounded:
- _approval_resolved / _clarify_resolved (caps 1000): unclicked
approval/clarify prompts leaked their double-click-guard entries
forever; oldest-insertion eviction via _trim_oldest_dict_entries.
- _reacting_message_ids (cap 5000): reaction lifecycle entries leaked
when an exception fired between add and finalize; oldest-ts eviction.
- _active_status_threads (cap 1000): statuses abandoned by error paths
accumulated; oldest-thread-ts eviction so the newest live status is
never cleared.
- _channel_team (cap 10000): grew with every DM channel the bot ever
saw (DM channel IDs are per-user). All four write sites now route
through _remember_channel_team; eviction is safe because entries are
re-learned from the next event and _get_client falls back to the
primary client.
- _slash_command_contexts (cap 1000): TTL cleanup only ran on lookup,
so contexts whose ephemeral replies never happened accumulated;
overflow purges expired entries first, then oldest-stash-first.
Converted from arbitrary set-order eviction to oldest-first:
- _titled_assistant_threads: keys are (team, channel, thread_ts) —
now evicts oldest thread first via _discard_oldest_by_thread_ts.
- _thread_rehydration_checked: keys are team:channel:thread_ts[:user] —
arbitrary eviction here would re-run an ACTIVE thread's restart
rehydration check and re-inject the missed-delta context; now evicts
oldest thread first.
- _reacting_message_ids uses #51097's _discard_oldest_slack_timestamps.
Deliberately NOT bounded (naturally tiny, per-workspace):
_team_clients, _team_bot_user_ids, _team_bot_names (one entry per
installed workspace), _assistant_threads / _agent_view_contexts /
_bot_message_ts / _mentioned_threads / _user_name_cache /
_thread_context_cache (already bounded), _dedup (MessageDeduplicator
has max_size + TTL internally).
New helpers: _trim_oldest_dict_entries (dicts preserve insertion
order, so oldest-first is exact) and _discard_oldest_by_thread_ts
(chronological sort on the embedded Slack ts for keyed sets).
Tests: caps hold under churn, eviction removes OLDEST not arbitrary
entries, newest/active entries survive eviction pressure (regression
shape for #51019), plus end-to-end paths through _resolve_user_name
and _handle_slash_command.
Part of the C16 cache-bounds consolidation with #51097 (markoub),
#23676 and #23375 (EloquentBrush). Fixes#51019.
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