refactor: Standardize on JSON Schema Draft 2020-12 to validate stream schemas

singer_sdk/_singerlib/schema.py

@@ -11,6 +11,11 @@
 if t.TYPE_CHECKING:
     from referencing._core import Resolver
 
+META_KEYS = [
+    "id",
+    "schema",
+]
+
 # These are keys defined in the JSON Schema spec that do not themselves contain
 # schemas (or lists of schemas)
 STANDARD_KEYS = [
@@ -52,6 +57,9 @@ class Schema:
     This is because we wanted to expand it with extra STANDARD_KEYS.
     """
 
+    id: str | None = None
+    schema: str | None = None
+
     type: str | list[str] | None = None
     default: t.Any | None = None
     properties: dict | None = None
@@ -94,6 +102,10 @@ def to_dict(self) -> dict[str, t.Any]:
             if self.__dict__.get(key) is not None:
                 result[key] = self.__dict__[key]
 
+        for key in META_KEYS:
+            if self.__dict__.get(key) is not None:
+                result[f"${key}"] = self.__dict__[key]
+
         return result
 
     @classmethod
@@ -110,7 +122,40 @@ def from_dict(
 
         Returns:
             The initialized Schema object.
-        """
+
+        Example:
+            >>> data = {
+            ...     "$id": "https://example.com/person.schema.json",
+            ...     "$schema": "http://json-schema.org/draft/2020-12/schema",
+            ...     "title": "Person",
+            ...     "type": "object",
+            ...     "properties": {
+            ...         "firstName": {
+            ...             "type": "string",
+            ...             "description": "The person's first name.",
+            ...         },
+            ...         "lastName": {
+            ...             "type": "string",
+            ...             "description": "The person's last name.",
+            ...         },
+            ...         "age": {
+            ...             "description": "Age in years which must be equal to or greater than zero.",
+            ...             "type": "integer",
+            ...             "minimum": 0,
+            ...         },
+            ...     },
+            ...     "required": ["firstName", "lastName"],
+            ... }
+            >>> schema = Schema.from_dict(data)
+            >>> schema.title
+            'Person'
+            >>> schema.properties["firstName"].description
+            "The person's first name."
+            >>> schema.properties["age"].minimum
+            0
+            >>> schema.schema
+            'http://json-schema.org/draft/2020-12/schema'
+        """  # noqa: E501
         kwargs = schema_defaults.copy()
         properties = data.get("properties")
         items = data.get("items")
@@ -121,9 +166,15 @@ def from_dict(
             }
         if items is not None:
             kwargs["items"] = cls.from_dict(items, **schema_defaults)
+
         for key in STANDARD_KEYS:
             if key in data:
                 kwargs[key] = data[key]
+
+        for key in META_KEYS:
+            if f"${key}" in data:
+                kwargs[key] = data[f"${key}"]
+
         return cls(**kwargs)
 
 

singer_sdk/typing.py

@@ -123,7 +123,7 @@
     None,
 ]
 
-DEFAULT_JSONSCHEMA_VALIDATOR: type[Validator] = validators.Draft7Validator  # type: ignore[assignment]
+DEFAULT_JSONSCHEMA_VALIDATOR: type[Validator] = validators.Draft202012Validator  # type: ignore[assignment]
 
 T = t.TypeVar("T", bound=_JsonValue)
 P = t.TypeVar("P")
@@ -1115,6 +1115,17 @@
         """
         self.wrapped[property.name] = property
 
+    @property
+    def type_dict(self) -> dict:  # type: ignore[override]
+        """Get type dictionary.
+
+        Returns:
+            A dictionary describing the type.
+        """
+        d = super().type_dict
+        d["$schema"] = "https://json-schema.org/draft/2020-12/schema"
+        return d
+
     def __iter__(self) -> t.Iterator[Property]:
         """Iterate all properties of the property list.
 

tests/core/test_jsonschema_helpers.py

@@ -161,7 +161,8 @@ def test_to_json():
             "required": [
                 "test_property"
             ],
-            "additionalProperties": false
+            "additionalProperties": false,
+            "$schema": "https://json-schema.org/draft/2020-12/schema"
         }""",
     )
 
@@ -172,6 +173,7 @@ def test_any_type(caplog: pytest.LogCaptureFixture):
     )
     with caplog.at_level(WARNING):
         assert schema.to_dict() == {
+            "$schema": "https://json-schema.org/draft/2020-12/schema",
             "type": "object",
             "properties": {
                 "any_type": {

tests/snapshots/countries_write_schemas/countries_write_schemas

@@ -1,2 +1,2 @@
 {"type":"SCHEMA","stream":"continents","schema":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]}},"type":"object"},"key_properties":["code"]}
-{"type":"SCHEMA","stream":"countries","schema":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]},"native":{"type":["string","null"]},"phone":{"type":["string","null"]},"capital":{"type":["string","null"]},"currency":{"type":["string","null"]},"emoji":{"type":["string","null"]},"continent":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]}},"type":["object","null"]},"languages":{"items":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]}},"type":"object"},"type":["array","null"]}},"type":"object"},"key_properties":["code"]}
+{"type":"SCHEMA","stream":"countries","schema":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]},"native":{"type":["string","null"]},"phone":{"type":["string","null"]},"capital":{"type":["string","null"]},"currency":{"type":["string","null"]},"emoji":{"type":["string","null"]},"continent":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]}},"type":["object","null"]},"languages":{"items":{"properties":{"code":{"type":["string","null"]},"name":{"type":["string","null"]}},"type":"object"},"type":["array","null"]}},"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":["code"]}

tests/snapshots/mapped_stream/aliased_stream.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"aliased_stream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"aliased_stream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"aliased_stream","record":{"email":"[email protected]","count":21,"user":{"id":1,"sub":{"num":1,"custom_obj":"obj-hello"},"some_numbers":[3.14,2.718]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"aliased_stream","record":{"email":"[email protected]","count":13,"user":{"id":2,"sub":{"num":2,"custom_obj":"obj-world"},"some_numbers":[10.32,1.618]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"aliased_stream","record":{"email":"[email protected]","count":19,"user":{"id":3,"sub":{"num":3,"custom_obj":"obj-hello"},"some_numbers":[1.414,1.732]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}

tests/snapshots/mapped_stream/aliased_stream_batch.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"aliased_stream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"aliased_stream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"BATCH","stream":"aliased_stream","encoding":{"format":"jsonl","compression":"gzip"},"manifest":["file:///tmp/stream.json.gz"]}
 {"type":"STATE","value":{}}
 {"type":"STATE","value":{"bookmarks":{"mystream":{}}}}

tests/snapshots/mapped_stream/aliased_stream_not_expr.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"aliased.stream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"aliased.stream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"aliased.stream","record":{"email":"[email protected]","count":21,"user":{"id":1,"sub":{"num":1,"custom_obj":"obj-hello"},"some_numbers":[3.14,2.718]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"aliased.stream","record":{"email":"[email protected]","count":13,"user":{"id":2,"sub":{"num":2,"custom_obj":"obj-world"},"some_numbers":[10.32,1.618]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"aliased.stream","record":{"email":"[email protected]","count":19,"user":{"id":3,"sub":{"num":3,"custom_obj":"obj-hello"},"some_numbers":[1.414,1.732]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}

tests/snapshots/mapped_stream/aliased_stream_quoted.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"__stream_name__","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"__stream_name__","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"__stream_name__","record":{"email":"[email protected]","count":21,"user":{"id":1,"sub":{"num":1,"custom_obj":"obj-hello"},"some_numbers":[3.14,2.718]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"__stream_name__","record":{"email":"[email protected]","count":13,"user":{"id":2,"sub":{"num":2,"custom_obj":"obj-world"},"some_numbers":[10.32,1.618]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"__stream_name__","record":{"email":"[email protected]","count":19,"user":{"id":3,"sub":{"num":3,"custom_obj":"obj-hello"},"some_numbers":[1.414,1.732]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}

tests/snapshots/mapped_stream/builtin_variable_self.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"mystream","schema":{"type":"object","properties":{"email":{"type":["string","null"]}}},"key_properties":[]}
+{"type":"SCHEMA","stream":"mystream","schema":{"type":"object","properties":{"email":{"type":["string","null"]}},"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"mystream","record":{"email":"[email protected]"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"mystream","record":{"email":"[email protected]"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"mystream","record":{"email":"[email protected]"},"time_extracted":"2022-01-01T00:00:00+00:00"}

tests/snapshots/mapped_stream/builtin_variable_stream_name.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"mystream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]},"source_table":{"type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"mystream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]},"source_table":{"type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"mystream","record":{"email":"[email protected]","count":21,"user":{"id":1,"sub":{"num":1,"custom_obj":"obj-hello"},"some_numbers":[3.14,2.718]},"joined_at":"2022-01-01T00:00:00Z","source_table":"mystream"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"mystream","record":{"email":"[email protected]","count":13,"user":{"id":2,"sub":{"num":2,"custom_obj":"obj-world"},"some_numbers":[10.32,1.618]},"joined_at":"2022-01-01T00:00:00Z","source_table":"mystream"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"mystream","record":{"email":"[email protected]","count":19,"user":{"id":3,"sub":{"num":3,"custom_obj":"obj-hello"},"some_numbers":[1.414,1.732]},"joined_at":"2022-01-01T00:00:00Z","source_table":"mystream"},"time_extracted":"2022-01-01T00:00:00+00:00"}

tests/snapshots/mapped_stream/builtin_variable_stream_name_alias.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"aliased_mystream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"aliased_mystream","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"aliased_mystream","record":{"email":"[email protected]","count":21,"user":{"id":1,"sub":{"num":1,"custom_obj":"obj-hello"},"some_numbers":[3.14,2.718]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"aliased_mystream","record":{"email":"[email protected]","count":13,"user":{"id":2,"sub":{"num":2,"custom_obj":"obj-world"},"some_numbers":[10.32,1.618]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"aliased_mystream","record":{"email":"[email protected]","count":19,"user":{"id":3,"sub":{"num":3,"custom_obj":"obj-hello"},"some_numbers":[1.414,1.732]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}

tests/snapshots/mapped_stream/builtin_variable_stream_name_alias_expr.jsonl

@@ -1,5 +1,5 @@
 {"type":"STATE","value":{}}
-{"type":"SCHEMA","stream":"MYSTREAM","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"]},"key_properties":[]}
+{"type":"SCHEMA","stream":"MYSTREAM","schema":{"properties":{"email":{"type":["string"]},"count":{"type":["integer","null"]},"user":{"properties":{"id":{"type":["integer","null"]},"sub":{"properties":{"num":{"type":["integer","null"]},"custom_obj":{"type":["string","null"]}},"type":["object","null"]},"some_numbers":{"items":{"type":["number"]},"type":["array","null"]}},"type":["object","null"]},"joined_at":{"format":"date-time","type":["string","null"]}},"type":"object","required":["email"],"$schema":"https://json-schema.org/draft/2020-12/schema"},"key_properties":[]}
 {"type":"RECORD","stream":"MYSTREAM","record":{"email":"[email protected]","count":21,"user":{"id":1,"sub":{"num":1,"custom_obj":"obj-hello"},"some_numbers":[3.14,2.718]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"MYSTREAM","record":{"email":"[email protected]","count":13,"user":{"id":2,"sub":{"num":2,"custom_obj":"obj-world"},"some_numbers":[10.32,1.618]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}
 {"type":"RECORD","stream":"MYSTREAM","record":{"email":"[email protected]","count":19,"user":{"id":3,"sub":{"num":3,"custom_obj":"obj-hello"},"some_numbers":[1.414,1.732]},"joined_at":"2022-01-01T00:00:00Z"},"time_extracted":"2022-01-01T00:00:00+00:00"}