Introduces a dynamic filter layer in the chart type registry so operators can
disable individual plugins (e.g. `handlebars`) without a code deploy:
- `MCP_DISABLED_CHART_PLUGINS: frozenset[str]` — static deny-list in mcp_config.py
- `MCP_CHART_PLUGIN_ENABLED_FUNC: Callable[[str], bool] | None` — dynamic hook
for Harness/Split/per-user targeting; takes precedence over the deny-list
- Both keys are propagated through `get_mcp_config()` defaults
registry.py changes:
- `_PluginFilterConfig` frozen dataclass replaces two bare globals so
configure() replaces them atomically (no torn reads under concurrency)
- `configure(disabled, enabled_func)` — called at app init; accepts any
iterable for `disabled`; validates `enabled_func` is callable
- `_is_plugin_enabled()` — reads config once, fails closed on callable exception
- `get()` / `all_types()` / `is_enabled()` apply the filter at lookup time;
`is_registered()` and `display_name_for_viz_type()` intentionally bypass it
so callers can distinguish "unknown" vs "disabled" and existing charts still
resolve display names for disabled viz types
schema_validator.py: two-step pre-check — `is_registered()` for unknown types,
`is_enabled()` for disabled ones, with distinct `DISABLED_CHART_TYPE` error code.
Wiring:
- `SupersetAppInitializer.configure_mcp_chart_registry()` called after
`configure_feature_flags()` in `init_app()`
- `flask_singleton.py` re-calls `registry.configure()` after the MCP config
overlay so MCP-specific overrides in `superset_config.py` take effect in
standalone MCP mode
Tests: 28 cases in test_registry_filters.py covering deny-list, callable hook,
fail-closed on exception, all_types() filtering, display_name bypass, atomic
reconfigure, and configure() with list/tuple/frozenset inputs.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
P1.1 registry.py: move _plugins_loaded=True to after successful import so a
failed load doesn't permanently poison the registry.
P1.3 schemas.py: remove overly restrictive ColumnRef.name / FilterClause.column
/ BigNumberChartConfig.temporal_column regex that blocked valid column names
containing parentheses, slashes, and other SQL-common characters.
P2.3 (DRY): eliminate _CHART_TYPE_ERROR_HINTS second-registry in
schema_validator.py by adding schema_error_hint() to ChartTypePlugin protocol,
BaseChartPlugin default, and all 7 plugin classes. SchemaValidator now delegates
to the plugin registry instead of maintaining a parallel dict.
P3.3 test_registry.py: add full registry unit-test coverage (register, get,
all_types, is_registered, display_name_for_viz_type, proxy methods, duplicate
warning, empty chart_type validation, insertion-order guarantee).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Split long string literal in schema_validator.py line 202 (E501, 94 > 88 chars)
- Apply ruff format auto-fixes to big_number.py, handlebars.py, and test_get_chart_data.py
- Remove redundant local imports from BigNumberChartPlugin.post_map_validate()
now that BigNumberChartConfig and is_column_truly_temporal are at top level
- Add explanatory comments on the two remaining local get_registry imports in
chart_utils.py and dataset_validator.py (circular import prevention)
- Fix schema_validator.py and generate_chart.py docstring: XY 'x' field is
optional (defaults to dataset primary datetime column), not required
- Propagate cardinality suggestions alongside warnings in XYChartPlugin
- Clarify app.py instructions: chart_type_display_name is null for viz_types
outside the 7 generate_chart-supported types
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
H1: Delete 7 dead _pre_validate_* static methods from SchemaValidator
— exact duplicates of plugin pre_validate() methods, never called
after _pre_validate_chart_type() was updated to delegate to plugin.
H2: Inline DatasetValidator._normalize_xy_config/_normalize_table_config
into XYChartPlugin/TableChartPlugin.normalize_column_refs() and delete
both DatasetValidator helper methods. The 5 other plugins already
called _get_canonical_column_name directly; XY and Table now match.
H3: Add generate_name()/resolve_viz_type() to ChartTypePlugin protocol
and BaseChartPlugin, implement in all 7 plugins. Replace the 7-arm
isinstance chain in generate_chart_name() and the 7-arm elif chain
in _resolve_viz_type() with single-line registry dispatch.
H4: Add a sync comment above _CHART_TYPE_ERROR_HINTS to document that
it must stay in sync with the plugin registry.
M4: Move logger=logging.getLogger(__name__) from inside
XYChartPlugin.get_runtime_warnings() to module scope.
Replaces four scattered dispatch locations (schema_validator, dataset_validator,
chart_utils, runtime validator) with a central ChartTypePlugin registry. Each of
the 7 supported chart types (xy, table, pie, pivot_table, mixed_timeseries,
handlebars, big_number) now owns its pre-validation, column extraction, form_data
mapping, post-map validation, column normalization, and runtime warnings in a
single plugin class.
Key changes:
- Add ChartTypePlugin protocol and BaseChartPlugin base class (plugin.py)
- Add ChartTypeRegistry with register/get/all_types helpers (registry.py)
- Add 7 chart type plugins under chart/plugins/ with full coverage
- Fix 5-type column validation gap: pie, pivot_table, mixed_timeseries, handlebars,
and big_number now participate in dataset column validation (previously silently skipped)
- Move BigNumber trendline temporal check to BigNumberChartPlugin.post_map_validate()
- Add get_runtime_warnings() to plugin protocol; XYChartPlugin implements
format/cardinality checks, removing isinstance(config, XYChartConfig) from RuntimeValidator
- Fix stale generate_chart.py docstring listing only 'xy' and 'table' chart types
- Add missing pie, pivot_table, mixed_timeseries handlers to _enhance_validation_error;
refactor into a data-driven lookup table to stay within complexity limits
- Fix empty details fallback in Pydantic error handler
