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Central - data hub spine. Adapters -> NATS/JetStream -> archive.
- Python 90.5%
- HTML 9.1%
- PLpgSQL 0.4%
ead6ef8ce1
Adds an optional async hook on SourceAdapter so any adapter can surface a
settings-driven preview on its /adapters/<name> edit page. The framework
renders the result generically as a table — no adapter-name branches in
GUI templates or route code.
Framework changes:
- src/central/adapter.py: new async preview_for_settings(self, settings)
on the base class, default returns None. Adapters opt in by overriding;
non-overriding adapters render unchanged.
- src/central/gui/routes.py: GET /adapters/{name} instantiates the adapter
with a no-op _PreviewConfigStore stub and a /dev/null cursor path (GUI
has no live ConfigStore), constructs settings_obj via the schema, and
calls preview_for_settings inside a try/except. Result lands in template
context as preview_rows / preview_error.
- src/central/gui/templates/_adapter_preview.html: new partial. Generic
table with columns derived from the first dict's keys; error banner
mirrors the existing last_error article style.
- src/central/gui/templates/adapters_edit.html: one-line include between
the Region fieldset and Save/Cancel.
NWIS opt-in:
- New NWIS_MONITORING_LOCATIONS_URL constant and _PREVIEW_LIMIT cap of 50.
- preview_for_settings returns None when region is None, otherwise one-shot
fetches monitoring-locations within the bbox via a fresh aiohttp session.
Must work even when adapter is not started -- the GUI process never calls
startup(). Returns list[dict] with the contract column order: site_id,
name, site_type, state. Errors propagate so the framework can render the
operator-visible banner.
- HTTP call factored into _fetch_preview_text so tests mock cleanly.
Tests (7 new):
- tests/test_preview_hook.py: default returns None; partial renders list
with correct headers/rows/count; partial renders error banner; partial
renders empty when both context values are None.
- tests/test_nwis.py adds TestNWISPreview: returns None without region,
returns rows with correct column order, propagates HTTP errors.
Verification:
- 457/457 full suite green (was 450; +7 new tests).
- Live /adapters/nwis preview returns 50 rows with the contract keys
against the current production Iowa bbox.
- /adapters/eonet preview_for_settings returns None via base default --
proves framework is duck-typed, no NWIS-specific code in framework.
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| docs | ||
| etc-templates | ||
| scripts | ||
| sql | ||
| src/central | ||
| systemd | ||
| tests | ||
| .gitattributes | ||
| .gitignore | ||
| .python-version | ||
| CHANGELOG.md | ||
| LICENSE | ||
| pyproject.toml | ||
| README.md | ||
| uv.lock | ||
Central
Central is the data hub spine for the infrastructure. Adapters normalize upstream sources into a canonical event shape, publish CloudEvents to NATS/JetStream, and archive to TimescaleDB for historical query. Single-LXC deployment.
Status
Phase 0 — scaffold. Not yet operational.
Architecture
- Python 3.12 (uv-managed)
- NATS + JetStream for live event bus
- TimescaleDB + PostGIS for archive and geospatial query
- One supervisor process managing adapter lifecycle
- One archive consumer process persisting events to TimescaleDB
- Both processes systemd-managed
Testing
See docs/test-database.md for test database setup.
License
MIT. See LICENSE.