Building Project Files

venv/lib/python3.12/site-packages/referencing/tests/test_retrieval.py

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+from functools import lru_cache
+import json
+
+import pytest
+
+from referencing import Registry, Resource, exceptions
+from referencing.jsonschema import DRAFT202012
+from referencing.retrieval import to_cached_resource
+
+
+class TestToCachedResource:
+    def test_it_caches_retrieved_resources(self):
+        contents = {"$schema": "https://json-schema.org/draft/2020-12/schema"}
+        stack = [json.dumps(contents)]
+
+        @to_cached_resource()
+        def retrieve(uri):
+            return stack.pop()
+
+        registry = Registry(retrieve=retrieve)
+
+        expected = Resource.from_contents(contents)
+
+        got = registry.get_or_retrieve("urn:example:schema")
+        assert got.value == expected
+
+        # And a second time we get the same value.
+        again = registry.get_or_retrieve("urn:example:schema")
+        assert again.value is got.value
+
+    def test_custom_loader(self):
+        contents = {"$schema": "https://json-schema.org/draft/2020-12/schema"}
+        stack = [json.dumps(contents)[::-1]]
+
+        @to_cached_resource(loads=lambda s: json.loads(s[::-1]))
+        def retrieve(uri):
+            return stack.pop()
+
+        registry = Registry(retrieve=retrieve)
+
+        expected = Resource.from_contents(contents)
+
+        got = registry.get_or_retrieve("urn:example:schema")
+        assert got.value == expected
+
+        # And a second time we get the same value.
+        again = registry.get_or_retrieve("urn:example:schema")
+        assert again.value is got.value
+
+    def test_custom_from_contents(self):
+        contents = {}
+        stack = [json.dumps(contents)]
+
+        @to_cached_resource(from_contents=DRAFT202012.create_resource)
+        def retrieve(uri):
+            return stack.pop()
+
+        registry = Registry(retrieve=retrieve)
+
+        expected = DRAFT202012.create_resource(contents)
+
+        got = registry.get_or_retrieve("urn:example:schema")
+        assert got.value == expected
+
+        # And a second time we get the same value.
+        again = registry.get_or_retrieve("urn:example:schema")
+        assert again.value is got.value
+
+    def test_custom_cache(self):
+        schema = {"$schema": "https://json-schema.org/draft/2020-12/schema"}
+        mapping = {
+            "urn:example:1": dict(schema, foo=1),
+            "urn:example:2": dict(schema, foo=2),
+            "urn:example:3": dict(schema, foo=3),
+        }
+
+        resources = {
+            uri: Resource.from_contents(contents)
+            for uri, contents in mapping.items()
+        }
+
+        @to_cached_resource(cache=lru_cache(maxsize=2))
+        def retrieve(uri):
+            return json.dumps(mapping.pop(uri))
+
+        registry = Registry(retrieve=retrieve)
+
+        got = registry.get_or_retrieve("urn:example:1")
+        assert got.value == resources["urn:example:1"]
+        assert registry.get_or_retrieve("urn:example:1").value is got.value
+        assert registry.get_or_retrieve("urn:example:1").value is got.value
+
+        got = registry.get_or_retrieve("urn:example:2")
+        assert got.value == resources["urn:example:2"]
+        assert registry.get_or_retrieve("urn:example:2").value is got.value
+        assert registry.get_or_retrieve("urn:example:2").value is got.value
+
+        # This still succeeds, but evicts the first URI
+        got = registry.get_or_retrieve("urn:example:3")
+        assert got.value == resources["urn:example:3"]
+        assert registry.get_or_retrieve("urn:example:3").value is got.value
+        assert registry.get_or_retrieve("urn:example:3").value is got.value
+
+        # And now this fails (as we popped the value out of `mapping`)
+        with pytest.raises(exceptions.Unretrievable):
+            registry.get_or_retrieve("urn:example:1")