Eliminates the duplication that has been hand-bumped through PRs B, C, D, E.
Adding a stream is now one StreamEntry in src/central/streams.py + one
migration row in config.streams. supervisor STREAM_SUBJECTS / archive
STREAMS / gui DASHBOARD_STREAMS all derive at import time. No drift
possible because there is one source.
Pure refactor; no behavior change. Runtime verified: derived structures
are byte-equivalent to the previous literal definitions.
src/central/streams.py (new):
@dataclass(frozen=True)
class StreamEntry:
name: str
subject_filter: str
event_bearing: bool = True # archive consumes from this stream
dashboard: bool = True # GUI dashboard surfaces this stream
STREAMS: list[StreamEntry] = [
StreamEntry("CENTRAL_WX", "central.wx.>"),
StreamEntry("CENTRAL_FIRE", "central.fire.>"),
StreamEntry("CENTRAL_QUAKE", "central.quake.>"),
StreamEntry("CENTRAL_SPACE", "central.space.>"),
StreamEntry("CENTRAL_DISASTER", "central.disaster.>"),
StreamEntry("CENTRAL_META", "central.meta.>", event_bearing=False),
]
Consumers derive:
supervisor.STREAM_SUBJECTS = {s.name: [s.subject_filter] for s in STREAMS}
(includes META: supervisor must create every stream in JetStream)
archive.STREAMS = [(s.name, s.subject_filter) for s in STREAMS if s.event_bearing]
(excludes META: status messages, not events)
gui.DASHBOARD_STREAMS = [s.name for s in STREAMS if s.dashboard]
To resolve the name collision between the registry STREAMS and the
existing archive.STREAMS public symbol, archive.py imports the registry
under an alias: from central.streams import STREAMS as STREAM_REGISTRY.
The archives STREAMS surface (the tuple-list) is unchanged for callers.
Same alias used in supervisor.py and gui/routes.py for symmetry.
Migration files unchanged. config.streams keeps seeding retention/bytes --
operator-tunable ops state, separate SoT from the structural mapping.
Tests:
Dropped from test_archive_multi_stream.py (7, all tautological vs. registry):
test_streams_list_has_five_entries (magic-number count)
test_streams_contains_central_wx / fire / quake / space / disaster
test_streams_excludes_central_meta
Dropped from test_dashboard.py:
`assert len(streams) == 6` line inside test_single_stream_failure_doesnt_crash_card
(the test itself stays; only the magic-number assertion is removed)
Added in test_stream_registry.py (8 invariant tests):
test_stream_names_unique
test_subject_filters_unique
test_subject_filter_central_prefix_wildcard
test_meta_is_only_non_event_bearing
test_supervisor_stream_subjects_includes_meta
test_supervisor_stream_subjects_includes_all
test_archive_streams_excludes_non_event_bearing
test_dashboard_streams_matches_dashboard_flag
The new tests assert properties (uniqueness, format, derivation correctness),
not literals. Future stream additions need zero new test code -- every
invariant automatically covers them.
Note: test file named tests/test_stream_registry.py (not test_streams.py)
to avoid colliding with the pre-existing tests/test_streams.py, which
covers the GUI streams-management page.
Full suite: 427 passed (was 426 on main: -7 dropped + 8 added).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
