feat: Added grpc and rest endpoint for features

docs/reference/feature-servers/registry-server.md

@@ -274,6 +274,137 @@ Most endpoints support these common query parameters:
   }
   ```
 
+### Features
+
+#### List Features
+- **Endpoint**: `GET /api/v1/features`
+- **Description**: Retrieve all features in a project
+- **Parameters**:
+  - `project` (required): Project name
+  - `feature_view` (optional): Filter by feature view name
+  - `name` (optional): Filter by feature name
+  - `include_relationships` (optional): Include relationships for each feature (relationships are keyed by feature name)
+  - `allow_cache` (optional): Whether to allow cached data
+  - `page` (optional): Page number for pagination
+  - `limit` (optional): Number of items per page
+  - `sort_by` (optional): Field to sort by
+  - `sort_order` (optional): Sort order ("asc" or "desc")
+- **Examples**:
+  ```bash
+  # Basic list
+  curl -H "Authorization: Bearer <token>" \
+    "http://localhost:6572/api/v1/features?project=my_project"
+
+  # With pagination and relationships
+  curl -H "Authorization: Bearer <token>" \
+    "http://localhost:6572/api/v1/features?project=my_project&include_relationships=true&page=1&limit=5"
+  ```
+- **Response Example**:
+  ```json
+  {
+    "features": [
+      { "name": "conv_rate", "featureView": "driver_hourly_stats_fresh", "type": "Float32" },
+      { "name": "acc_rate", "featureView": "driver_hourly_stats_fresh", "type": "Float32" },
+      { "name": "avg_daily_trips", "featureView": "driver_hourly_stats_fresh", "type": "Int64" },
+      { "name": "conv_rate", "featureView": "driver_hourly_stats", "type": "Float32" },
+      { "name": "acc_rate", "featureView": "driver_hourly_stats", "type": "Float32" }
+    ],
+    "pagination": {
+      "page": 1,
+      "limit": 5,
+      "totalCount": 10,
+      "totalPages": 2,
+      "hasNext": true
+    },
+    "relationships": {
+      "conv_rate": [
+        { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats_fresh" } },
+        { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats" } },
+        { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureService", "name": "driver_activity_v1" } }
+      ]
+    }
+  }
+  ```
+
+#### Get Feature
+- **Endpoint**: `GET /api/v1/features/{feature_view}/{name}`
+- **Description**: Retrieve a specific feature by feature view and name
+- **Parameters**:
+  - `feature_view` (path): Feature view name
+  - `name` (path): Feature name
+  - `project` (required): Project name
+  - `include_relationships` (optional): Include relationships for this feature
+  - `allow_cache` (optional): Whether to allow cached data
+- **Examples**:
+  ```bash
+  # Basic get
+  curl -H "Authorization: Bearer <token>" \
+    "http://localhost:6572/api/v1/features/driver_hourly_stats/conv_rate?project=my_project"
+
+  # With relationships
+  curl -H "Authorization: Bearer <token>" \
+    "http://localhost:6572/api/v1/features/driver_hourly_stats/conv_rate?project=my_project&include_relationships=true"
+  ```
+- **Response Example**:
+  ```json
+  {
+    "name": "conv_rate",
+    "featureView": "driver_hourly_stats",
+    "type": "Float32",
+    "relationships": [
+      { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats_fresh" } },
+      { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats" } },
+      { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureService", "name": "driver_activity_v1" } }
+    ]
+  }
+  ```
+
+#### List All Features (All Projects)
+- **Endpoint**: `GET /api/v1/features/all`
+- **Description**: Retrieve all features across all projects. Each feature includes a `project` field.
+- **Parameters**:
+  - `page` (optional): Page number for pagination
+  - `limit` (optional): Number of items per page
+  - `sort_by` (optional): Field to sort by
+  - `sort_order` (optional): Sort order ("asc" or "desc")
+  - `include_relationships` (optional): Include relationships for each feature
+  - `allow_cache` (optional): Whether to allow cached data
+- **Examples**:
+  ```bash
+  curl -H "Authorization: Bearer <token>" \
+    "http://localhost:6572/api/v1/features/all?page=1&limit=5&sort_by=name"
+  # With relationships
+  curl -H "Authorization: Bearer <token>" \
+    "http://localhost:6572/api/v1/features/all?include_relationships=true"
+  ```
+- **Response Example**:
+  ```json
+  {
+    "features": [
+      { "name": "conv_rate", "featureView": "driver_hourly_stats_fresh", "type": "Float32", "project": "multiproject" },
+      { "name": "acc_rate", "featureView": "driver_hourly_stats_fresh", "type": "Float32", "project": "multiproject" },
+      { "name": "avg_daily_trips", "featureView": "driver_hourly_stats_fresh", "type": "Int64", "project": "multiproject" },
+      { "name": "conv_rate", "featureView": "driver_hourly_stats", "type": "Float32", "project": "multiproject" },
+      { "name": "acc_rate", "featureView": "driver_hourly_stats", "type": "Float32", "project": "multiproject" }
+    ],
+    "pagination": {
+      "page": 1,
+      "limit": 5,
+      "total_count": 20,
+      "total_pages": 4,
+      "has_next": true,
+      "has_previous": false
+    },
+    "relationships": {
+      "conv_rate": [
+        { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats" } },
+        { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats_fresh" } },
+        { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureService", "name": "driver_activity_v3" } }
+      ]
+    }
+  }
+  ```
+
 ### Feature Services
 
 #### List Feature Services
@@ -356,7 +487,7 @@ Most endpoints support these common query parameters:
 - **Parameters**:
   - `project` (required): Project name
   - `allow_cache` (optional): Whether to allow cached data
-  - `filter_object_type` (optional): Filter by object type (`dataSource`, `entity`, `featureView`, `featureService`)
+  - `filter_object_type` (optional): Filter by object type (`dataSource`, `entity`, `featureView`, `featureService`, `feature`)
   - `filter_object_name` (optional): Filter by object name
 - **Example**:
   ```bash
@@ -368,15 +499,25 @@ Most endpoints support these common query parameters:
 - **Endpoint**: `GET /api/v1/lineage/objects/{object_type}/{object_name}`
 - **Description**: Retrieve relationships for a specific object
 - **Parameters**:
-  - `object_type` (path): Type of object (`dataSource`, `entity`, `featureView`, `featureService`)
+  - `object_type` (path): Type of object (`dataSource`, `entity`, `featureView`, `featureService`, `feature`)
   - `object_name` (path): Name of the object
   - `project` (required): Project name
   - `include_indirect` (optional): Whether to include indirect relationships
   - `allow_cache` (optional): Whether to allow cached data
 - **Example**:
   ```bash
   curl -H "Authorization: Bearer <token>" \
-    "http://localhost:6572/api/v1/lineage/objects/featureView/user_features?project=my_project&include_indirect=true"
+    "http://localhost:6572/api/v1/lineage/objects/feature/conv_rate?project=my_project&include_indirect=true"
+  ```
+- **Response Example**:
+  ```json
+  {
+    "relationships": [
+      { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats_fresh" } },
+      { "source": { "type": "feature", "name": "conv_rate" }, "target": { "type": "featureView", "name": "driver_hourly_stats" } }
+    ],
+    "pagination": { "totalCount": 2, "totalPages": 1 }
+  }
   ```
 
 #### Get Complete Registry Data
@@ -390,6 +531,35 @@ Most endpoints support these common query parameters:
   curl -H "Authorization: Bearer <token>" \
     "http://localhost:6572/api/v1/lineage/complete?project=my_project"
   ```
+- **Response Example**:
+  ```json
+  {
+    "project": "multiproject",
+    "objects": {
+      "entities": [ ... ],
+      "dataSources": [ ... ],
+      "featureViews": [ ... ],
+      "featureServices": [ ... ],
+      "features": [
+        { "name": "conv_rate", "featureView": "driver_hourly_stats_fresh", "type": "Float32" },
+        { "name": "acc_rate", "featureView": "driver_hourly_stats_fresh", "type": "Float32" },
+        { "name": "avg_daily_trips", "featureView": "driver_hourly_stats_fresh", "type": "Int64" },
+        { "name": "conv_rate", "featureView": "driver_hourly_stats", "type": "Float32" },
+        { "name": "acc_rate", "featureView": "driver_hourly_stats", "type": "Float32" },
+        { "name": "conv_rate_plus_val1", "featureView": "transformed_conv_rate_fresh", "type": "Float64" },
+        { "name": "conv_rate_plus_val2", "featureView": "transformed_conv_rate_fresh", "type": "Float64" },
+        { "name": "conv_rate_plus_val1", "featureView": "transformed_conv_rate", "type": "Float64" },
+        { "name": "conv_rate_plus_val2", "featureView": "transformed_conv_rate", "type": "Float64" }
+      ]
+    },
+    "relationships": [ ... ],
+    "indirectRelationships": [ ... ],
+    "pagination": {
+      "features": { "totalCount": 10, "totalPages": 1 },
+      ...
+    }
+  }
+  ```
 
 #### Get Registry Lineage (All Projects)
 - **Endpoint**: `GET /api/v1/lineage/registry/all`
@@ -716,6 +886,7 @@ Relationships show how different Feast objects connect to each other, providing
 - `entity` - Feast entities
 - `dataSource` - Data sources
 - `featureView` - Feature views (including regular, on-demand, and stream)
+- `feature` - Features (including features from on-demand feature views)
 - `featureService` - Feature services
 - `permission` - Permissions
 - `savedDataset` - Saved datasets
@@ -724,6 +895,8 @@ Relationships show how different Feast objects connect to each other, providing
 - Feature Views → Data Sources (feature views depend on data sources)
 - Feature Views → Entities (feature views use entities as join keys)
 - Feature Services → Feature Views (feature services consume feature views)
+- Features → Feature Views (features belong to feature views, including on-demand feature views)
+- Features → Feature Services (features are consumed by feature services)
 - Entities → Data Sources (entities connect to data sources through feature views)
 - Entities → Feature Services (entities connect to feature services through feature views)
 

protos/feast/registry/RegistryServer.proto

@@ -92,6 +92,9 @@ service RegistryServer{
   rpc GetRegistryLineage (GetRegistryLineageRequest) returns (GetRegistryLineageResponse) {}
   rpc GetObjectRelationships (GetObjectRelationshipsRequest) returns (GetObjectRelationshipsResponse) {}
 
+  // Feature RPCs
+  rpc ListFeatures (ListFeaturesRequest) returns (ListFeaturesResponse) {}
+  rpc GetFeature (GetFeatureRequest) returns (Feature) {}
 }
 
 // Common pagination and sorting messages
@@ -524,3 +527,32 @@ message GetObjectRelationshipsResponse {
   repeated EntityRelation relationships = 1;
   PaginationMetadata pagination = 2;
 }
+
+// Feature messages
+message Feature {
+  string name = 1;
+  string feature_view = 2;
+  string type = 3;
+  string description = 4;
+  map<string, string> tags = 7;
+}
+
+message ListFeaturesRequest {
+  string project = 1;
+  string feature_view = 2;
+  string name = 3;
+  bool allow_cache = 6;
+  PaginationParams pagination = 4;
+  SortingParams sorting = 5;
+}
+
+message ListFeaturesResponse {
+  repeated Feature features = 1;
+  PaginationMetadata pagination = 2;
+}
+
+message GetFeatureRequest {
+  string project = 1;
+  string feature_view = 2;
+  string name = 3;
+}

sdk/python/feast/api/registry/rest/__init__.py

@@ -4,6 +4,7 @@
 from feast.api.registry.rest.entities import get_entity_router
 from feast.api.registry.rest.feature_services import get_feature_service_router
 from feast.api.registry.rest.feature_views import get_feature_view_router
+from feast.api.registry.rest.features import get_feature_router
 from feast.api.registry.rest.lineage import get_lineage_router
 from feast.api.registry.rest.permissions import get_permission_router
 from feast.api.registry.rest.projects import get_project_router
@@ -15,6 +16,7 @@ def register_all_routes(app: FastAPI, grpc_handler):
     app.include_router(get_data_source_router(grpc_handler))
     app.include_router(get_feature_service_router(grpc_handler))
     app.include_router(get_feature_view_router(grpc_handler))
+    app.include_router(get_feature_router(grpc_handler))
     app.include_router(get_lineage_router(grpc_handler))
     app.include_router(get_permission_router(grpc_handler))
     app.include_router(get_project_router(grpc_handler))

sdk/python/feast/api/registry/rest/features.py

@@ -0,0 +1,97 @@
+from fastapi import APIRouter, Depends, Query
+
+from feast.api.registry.rest.rest_utils import (
+    aggregate_across_projects,
+    create_grpc_pagination_params,
+    create_grpc_sorting_params,
+    get_object_relationships,
+    get_pagination_params,
+    get_relationships_for_objects,
+    get_sorting_params,
+    grpc_call,
+)
+from feast.registry_server import RegistryServer_pb2
+
+
+def get_feature_router(grpc_handler) -> APIRouter:
+    router = APIRouter()
+
+    @router.get("/features")
+    def list_features(
+        project: str = Query(...),
+        feature_view: str = Query(None),
+        name: str = Query(None),
+        include_relationships: bool = Query(
+            False, description="Include relationships for each feature"
+        ),
+        allow_cache: bool = Query(
+            True, description="Allow using cached registry data (default: true)"
+        ),
+        pagination_params: dict = Depends(get_pagination_params),
+        sorting_params: dict = Depends(get_sorting_params),
+    ):
+        req = RegistryServer_pb2.ListFeaturesRequest(
+            project=project,
+            feature_view=feature_view or "",
+            name=name or "",
+            allow_cache=allow_cache,
+            pagination=create_grpc_pagination_params(pagination_params),
+            sorting=create_grpc_sorting_params(sorting_params),
+        )
+        response = grpc_call(grpc_handler.ListFeatures, req)
+        if include_relationships:
+            relationships = get_relationships_for_objects(
+                grpc_handler, response["features"], "feature", project, allow_cache
+            )
+            response["relationships"] = relationships
+        return response
+
+    @router.get("/features/{feature_view}/{name}")
+    def get_feature(
+        feature_view: str,
+        name: str,
+        project: str = Query(...),
+        include_relationships: bool = Query(
+            False, description="Include relationships for this feature"
+        ),
+    ):
+        req = RegistryServer_pb2.GetFeatureRequest(
+            project=project,
+            feature_view=feature_view,
+            name=name,
+        )
+        response = grpc_call(grpc_handler.GetFeature, req)
+        if include_relationships:
+            response["relationships"] = get_object_relationships(
+                grpc_handler, "feature", name, project
+            )
+        return response
+
+    @router.get("/features/all")
+    def list_features_all(
+        page: int = Query(1, ge=1),
+        limit: int = Query(50, ge=1, le=100),
+        sort_by: str = Query(None),
+        sort_order: str = Query("asc"),
+        include_relationships: bool = Query(
+            False, description="Include relationships for each feature"
+        ),
+        allow_cache: bool = Query(
+            True, description="Allow using cached registry data (default: true)"
+        ),
+    ):
+        return aggregate_across_projects(
+            grpc_handler=grpc_handler,
+            list_method=grpc_handler.ListFeatures,
+            request_cls=RegistryServer_pb2.ListFeaturesRequest,
+            response_key="features",
+            object_type="feature",
+            include_relationships=include_relationships,
+            allow_cache=allow_cache,
+            page=page,
+            limit=limit,
+            sort_by=sort_by,
+            sort_order=sort_order,
+        )
+
+    return router