Create lazy function that caches DANDI LinkML schema

src/dandisets_linkml_status_tools/cli/tools.py

@@ -13,6 +13,7 @@
 from linkml.validator import Validator
 from linkml.validator.plugins import JsonschemaValidationPlugin, ValidationPlugin
 from linkml.validator.report import ValidationResult
+from linkml_runtime.linkml_model import SchemaDefinition
 from pydantic import TypeAdapter, ValidationError
 from pydantic2linkml.gen_linkml import translate_defs
 from yaml import dump as yaml_dump
@@ -38,9 +39,6 @@
 # The names of the collection of modules in which the DANDI models are defined
 DANDI_MODULE_NAMES = ["dandischema.models"]
 
-# The LinkML schema produced by the pydantic2linkml translator for DANDI models
-DANDI_LINKML_SCHEMA = translate_defs(DANDI_MODULE_NAMES)
-
 # A callable that sorts a given iterable of strings in a case-insensitive manner
 isorted = partial(sorted, key=str.casefold)
 
@@ -70,6 +68,9 @@ class DandisetLinkmlValidator:
     expressed in Pydantic
     """
 
+    # The LinkML schema produced by the pydantic2linkml translator for DANDI models
+    _dandi_linkml_schema: Optional[SchemaDefinition] = None
+
     def __init__(self, validation_plugins: Optional[list[ValidationPlugin]] = None):
         """
         Initialize a `DandisetLinkmlValidator` instance that wraps a LinkML validator
@@ -84,10 +85,22 @@ def __init__(self, validation_plugins: Optional[list[ValidationPlugin]] = None):
             validation_plugins = [JsonschemaValidationPlugin(closed=True)]
 
         self._inner_validator = Validator(
-            DANDI_LINKML_SCHEMA,
+            self.get_dandi_linkml_schema(),
             validation_plugins=validation_plugins,
         )
 
+    @classmethod
+    def get_dandi_linkml_schema(cls) -> SchemaDefinition:
+        """
+        Get the LinkML schema produced by the pydantic2linkml translator for DANDI models
+
+        :return: The LinkML schema
+        """
+        if cls._dandi_linkml_schema is None:
+            cls._dandi_linkml_schema = translate_defs(DANDI_MODULE_NAMES)
+
+        return cls._dandi_linkml_schema
+
     def validate(self, dandiset_metadata: dict[str, Any]) -> list[ValidationResult]:
         """
         Validate the given dandiset metadata against the dandiset metadata model in