Enable low-code CDK users to specify schema in the manifest (#20375)

Enable low-code CDK users to specify schema in the manifest

Also update documentation:
* Add inline schema loader info to yaml-overview.md
* Include inline schema info in tutorial

airbyte-cdk/python/CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 0.13.2
+Low-code: Enable low-code CDK users to specify schema inline in the manifest
+
 ## 0.13.1
 Low-code: Add `SessionTokenAuthenticator`
 

airbyte-cdk/python/airbyte_cdk/sources/declarative/config_component_schema.json

@@ -75,6 +75,9 @@
             },
             {
               "$ref": "#/definitions/DefaultSchemaLoader"
+            },
+            {
+              "$ref": "#/definitions/InlineSchemaLoader"
             }
           ]
         },
@@ -93,6 +96,9 @@
             },
             {
               "$ref": "#/definitions/DefaultSchemaLoader"
+            },
+            {
+              "$ref": "#/definitions/InlineSchemaLoader"
             }
           ]
         },
@@ -1609,6 +1615,11 @@
       ],
       "description": "\n    Loads a schema from the default location or returns an empty schema for streams that have not defined their schema file yet.\n\n    Attributes:\n        config (Config): The user-provided configuration as specified by the source's spec\n        options (Mapping[str, Any]): Additional arguments to pass to the string interpolation if needed\n    "
     },
+    "InlineSchemaLoader": {
+      "type": "object",
+      "properties": {},
+      "description": "Loads a schema from the manifest, if provided."
+    },
     "AddFields": {
       "allOf": [
         {

airbyte-cdk/python/airbyte_cdk/sources/declarative/manifest_declarative_source.py

@@ -40,7 +40,7 @@ class ConcreteDeclarativeSource(JsonSchemaMixin):
 class ManifestDeclarativeSource(DeclarativeSource):
     """Declarative source defined by a manifest of low-code components that define source connector behavior"""
 
-    VALID_TOP_LEVEL_FIELDS = {"check", "definitions", "spec", "streams", "version"}
+    VALID_TOP_LEVEL_FIELDS = {"check", "definitions", "schemas", "spec", "streams", "version"}
 
     def __init__(self, source_config: ConnectionDefinition, debug: bool = False):
         """

airbyte-cdk/python/airbyte_cdk/sources/declarative/parsers/class_types_registry.py

@@ -37,6 +37,7 @@ from airbyte_cdk.sources.declarative.requesters.paginators.strategies.cursor_pag
 from airbyte_cdk.sources.declarative.requesters.paginators.strategies.offset_increment import OffsetIncrement
 from airbyte_cdk.sources.declarative.requesters.paginators.strategies.page_increment import PageIncrement
 from airbyte_cdk.sources.declarative.retrievers.simple_retriever import SimpleRetriever
+from airbyte_cdk.sources.declarative.schema.inline_schema_loader import InlineSchemaLoader
 from airbyte_cdk.sources.declarative.schema.json_file_schema_loader import JsonFileSchemaLoader
 from airbyte_cdk.sources.declarative.spec import Spec
 from airbyte_cdk.sources.declarative.stream_slicers.cartesian_product_stream_slicer import CartesianProductStreamSlicer
@@ -66,6 +67,7 @@ CLASS_TYPES_REGISTRY: Mapping[str, Type] = {
     "DpathExtractor": DpathExtractor,
     "ExponentialBackoffStrategy": ExponentialBackoffStrategy,
     "HttpRequester": HttpRequester,
+    "InlineSchemaLoader": InlineSchemaLoader,
     "InterpolatedBoolean": InterpolatedBoolean,
     "InterpolatedString": InterpolatedString,
     "JsonSchema": JsonFileSchemaLoader,  # todo remove after hacktoberfest and update connectors to use JsonFileSchemaLoader

airbyte-cdk/python/airbyte_cdk/sources/declarative/schema/__init__.py

@@ -3,7 +3,8 @@
 #
 
 from airbyte_cdk.sources.declarative.schema.default_schema_loader import DefaultSchemaLoader
+from airbyte_cdk.sources.declarative.schema.inline_schema_loader import InlineSchemaLoader
 from airbyte_cdk.sources.declarative.schema.json_file_schema_loader import JsonFileSchemaLoader
 from airbyte_cdk.sources.declarative.schema.schema_loader import SchemaLoader
 
-__all__ = ["JsonFileSchemaLoader", "DefaultSchemaLoader", "SchemaLoader"]
+__all__ = ["JsonFileSchemaLoader", "DefaultSchemaLoader", "SchemaLoader", "InlineSchemaLoader"]

airbyte-cdk/python/airbyte_cdk/sources/declarative/schema/inline_schema_loader.py

@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2022 Airbyte, Inc., all rights reserved.
+#
+
+from dataclasses import InitVar, dataclass
+from typing import Any, Dict, Mapping
+
+from airbyte_cdk.sources.declarative.schema.schema_loader import SchemaLoader
+
+
+@dataclass
+class InlineSchemaLoader(SchemaLoader):
+    """Describes a stream's schema"""
+
+    schema: Dict[str, Any]
+    options: InitVar[Mapping[str, Any]]
+
+    def get_json_schema(self) -> Mapping[str, Any]:
+        return self.schema

airbyte-cdk/python/setup.py

@@ -15,7 +15,7 @@ README = (HERE / "README.md").read_text()
 
 setup(
     name="airbyte-cdk",
-    version="0.13.1",
+    version="0.13.2",
     description="A framework for writing Airbyte Connectors.",
     long_description=README,
     long_description_content_type="text/markdown",

airbyte-cdk/python/unit_tests/sources/declarative/schema/test_inline_schema_loader.py

@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2022 Airbyte, Inc., all rights reserved.
+#
+
+import pytest
+from airbyte_cdk.sources.declarative.schema import InlineSchemaLoader
+
+
+@pytest.mark.parametrize(
+    "test_name, input_schema, expected_schema",
+    [
+        ("schema", {"k": "string"}, {"k": "string"}),
+        ("empty_schema", {}, {}),
+    ],
+)
+def test_static_schema_loads(test_name, input_schema, expected_schema):
+    schema_loader = InlineSchemaLoader(input_schema, {})
+
+    assert schema_loader.get_json_schema() == expected_schema

docs/connector-development/config-based/source_schema.yaml

@@ -58,6 +58,15 @@ definitions:
         "$ref": "#/definitions/RecordTransformation"
       checkpoint_interval:
         type: integer
+  InlineSchemaLoader:
+    type: object
+    required:
+      - schema
+    properties:
+      "$options":
+        "$ref": "#/definitions/$options"
+      schema:
+        type: object
   PrimaryKey:
     type: string
   Retriever:

docs/connector-development/config-based/tutorial/4-reading-data.md

@@ -39,6 +39,8 @@ rm source_exchange_rates_tutorial/schemas/customers.json
 rm source_exchange_rates_tutorial/schemas/employees.json
 ```
 
+As an alternative to storing the stream's data schema to the `schemas/` directory, we can store it inline in the YAML file, by including the optional `schema_loader` key and associated schema in the entry for each stream. More information on how to define a stream's schema in the YAML file can be found [here](../understanding-the-yaml-file/yaml-overview.md).
+
 Reading from the source can be done by running the `read` operation
 
 ```bash

docs/connector-development/config-based/understanding-the-yaml-file/yaml-overview.md

@@ -7,10 +7,13 @@ The low-code framework involves editing a boilerplate [YAML file](../low-code-cd
 Streams define the schema of the data to sync, as well as how to read it from the underlying API source.
 A stream generally corresponds to a resource within the API. They are analogous to tables for a relational database source.
 
-A stream's schema will can defined as a [JSONSchema](https://json-schema.org/) file in `<source_connector_name>/schemas/<stream_name>.json`.
+By default, the schema of a stream's data is defined as a [JSONSchema](https://json-schema.org/) file in `<source_connector_name>/schemas/<stream_name>.json`. 
+
+Alternately, the stream's data schema can be stored in YAML format inline in the YAML file, by including the optional `schema_loader` key. If the data schema is provided inline, any schema on disk for that stream will be ignored.
+
 More information on how to define a stream's schema can be found [here](../source_schema.yaml)
 
-The schema of a stream object is:
+The stream object is represented in the YAML file as:
 
 ```yaml
   Stream:
@@ -34,6 +37,8 @@ The schema of a stream object is:
         "$ref": "#/definitions/RecordTransformation"
       checkpoint_interval:
         type: integer
+      schema_loader:
+        "$ref": "#/definitions/InlineSchemaLoader"
 ```
 
 More details on streams and sources can be found in the [basic concepts section](../../cdk-python/basic-concepts.md).
@@ -99,4 +104,4 @@ More information on `DatetimeStreamSlicer` can be found in the [stream slicers](
 ## More readings
 
 - [Requester](./requester.md)
-- [Stream slicers](./stream-slicers.md)
+- [Stream slicers](./stream-slicers.md)