Erik JohnstonandClaude Fable 5.1 2c379b5cb5 Resolve state groups in Rust, remembering each group's converted state ...

With the database work cached, converting the state sets from Python
dicts was the largest piece of a warm resolution: 5,010 entries pulled
out of tuples and interned, under the GIL, before the future starts,
and 2,505 entries built into a dict on the way back. Every group's
state was converted again on every resolution it took part in.

The handler gains resolve_state_groups, which takes the state groups
by ID with their state, as StateResolutionHandler.resolve_state_groups
receives them, and keeps each group's converted StateMap in a cache
keyed on the group ID. State groups are immutable and their IDs are
never reused, so an entry can only go stale by its group being
deleted, which makes it dead weight rather than wrong. The cache is
cleared on a room purge with the others. A group given with fewer
entries than its cached state is a filtered one: it is converted for
that call and does not replace the full map.

The result is returned in the shape of a _StateCacheEntry, chosen as
_make_state_cache_entry does: the input group the resolved state
equals, else the input group it differs least from and the difference,
else the state itself. So the common cases cross the boundary as a
group ID or a small delta rather than the whole state.

StateResolutionHandler.resolve_state_groups uses it in "on" mode, with
the usual fallback to Python for rooms without a chain cover index.
Shadow mode keeps comparing through resolve_events_with_store. The
state sets are now shared maps inside the Rust, so a cached map and a
converted one are handled alike.

On the benchmark room (2,000 members, 1,000 conflicted events) a warm
resolution through the state groups takes 9 to 11 ms end to end once
the groups' state is cached, from 15 to 19 through the flat entry
point; Python warm is 37 to 44.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ULdieJyQoHNzeHq42H2M1p

2026-10-13 17:34:55 +00:00

..

__init__.py

Add some state res v2 tests

2018-10-16 16:28:39 +01:00

test_rust_handler.py

Resolve state groups in Rust, remembering each group's converted state

2026-10-13 17:34:55 +00:00

test_v2.py

Check the Rust state resolution against Python in test_v2

2026-10-13 10:49:24 +00:00

test_v21.py

Fix up event-construction in tests ahead of the Rust event port (#19781)

2026-05-15 10:12:42 +01:00