feat: Adding support for dictionary writes to online store

sdk/python/feast/errors.py

@@ -420,3 +420,10 @@ def __init__(self, push_source_name: str):
 class ReadOnlyRegistryException(Exception):
     def __init__(self):
         super().__init__("Registry implementation is read-only.")
+
+
+class DataFrameSerializationError(Exception):
+    def __init__(self, input_dict: dict):
+        super().__init__(
+            f"Failed to serialize the provided dictionary into a pandas DataFrame: {input_dict.keys()}"
+        )

sdk/python/feast/feature_store.py

@@ -54,6 +54,7 @@
 from feast.dqm.errors import ValidationFailed
 from feast.entity import Entity
 from feast.errors import (
+    DataFrameSerializationError,
     DataSourceRepeatNamesException,
     EntityNotFoundException,
     FeatureNameCollisionError,
@@ -1406,7 +1407,8 @@ def push(
     def write_to_online_store(
         self,
         feature_view_name: str,
-        df: pd.DataFrame,
+        df: Optional[pd.DataFrame] = None,
+        input_dict: Optional[Dict] = None,
         allow_registry_cache: bool = True,
     ):
         """
@@ -1415,6 +1417,7 @@ def write_to_online_store(
         Args:
             feature_view_name: The feature view to which the dataframe corresponds.
             df: The dataframe to be persisted.
+            input_dict: Optional the dictionary object to be written
             allow_registry_cache (optional): Whether to allow retrieving feature views from a cached registry.
         """
         # TODO: restrict this to work with online StreamFeatureViews and validate the FeatureView type
@@ -1426,6 +1429,13 @@ def write_to_online_store(
             feature_view = self.get_feature_view(
                 feature_view_name, allow_registry_cache=allow_registry_cache
             )
+        if df is not None and input_dict is not None:
+            raise ValueError("Both df and dict cannot be provided at the same time.")
+        if df is None and input_dict is not None:
+            try:
+                df = pd.DataFrame(input_dict)
+            except Exception as _:
+                raise DataFrameSerializationError(input_dict)
         provider = self._get_provider()
         provider.ingest_df(feature_view, df)
 

sdk/python/tests/unit/online_store/test_online_writes.py

@@ -0,0 +1,139 @@
+# Copyright 2022 The Feast Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import tempfile
+import unittest
+from datetime import datetime, timedelta
+from typing import Any, Dict
+
+from feast import Entity, FeatureStore, FeatureView, FileSource, RepoConfig
+from feast.driver_test_data import create_driver_hourly_stats_df
+from feast.field import Field
+from feast.infra.online_stores.sqlite import SqliteOnlineStoreConfig
+from feast.on_demand_feature_view import on_demand_feature_view
+from feast.types import Float32, Float64, Int64
+
+
+class TestOnlineWrites(unittest.TestCase):
+    def setUp(self):
+        with tempfile.TemporaryDirectory() as data_dir:
+            self.store = FeatureStore(
+                config=RepoConfig(
+                    project="test_write_to_online_store",
+                    registry=os.path.join(data_dir, "registry.db"),
+                    provider="local",
+                    entity_key_serialization_version=2,
+                    online_store=SqliteOnlineStoreConfig(
+                        path=os.path.join(data_dir, "online.db")
+                    ),
+                )
+            )
+
+            # Generate test data.
+            end_date = datetime.now().replace(microsecond=0, second=0, minute=0)
+            start_date = end_date - timedelta(days=15)
+
+            driver_entities = [1001, 1002, 1003, 1004, 1005]
+            driver_df = create_driver_hourly_stats_df(
+                driver_entities, start_date, end_date
+            )
+            driver_stats_path = os.path.join(data_dir, "driver_stats.parquet")
+            driver_df.to_parquet(
+                path=driver_stats_path, allow_truncated_timestamps=True
+            )
+
+            driver = Entity(name="driver", join_keys=["driver_id"])
+
+            driver_stats_source = FileSource(
+                name="driver_hourly_stats_source",
+                path=driver_stats_path,
+                timestamp_field="event_timestamp",
+                created_timestamp_column="created",
+            )
+
+            driver_stats_fv = FeatureView(
+                name="driver_hourly_stats",
+                entities=[driver],
+                ttl=timedelta(days=0),
+                schema=[
+                    Field(name="conv_rate", dtype=Float32),
+                    Field(name="acc_rate", dtype=Float32),
+                    Field(name="avg_daily_trips", dtype=Int64),
+                ],
+                online=True,
+                source=driver_stats_source,
+            )
+
+            @on_demand_feature_view(
+                sources=[driver_stats_fv[["conv_rate", "acc_rate"]]],
+                schema=[Field(name="conv_rate_plus_acc", dtype=Float64)],
+                mode="python",
+            )
+            def test_view(inputs: Dict[str, Any]) -> Dict[str, Any]:
+                output: Dict[str, Any] = {
+                    "conv_rate_plus_acc": [
+                        conv_rate + acc_rate
+                        for conv_rate, acc_rate in zip(
+                            inputs["conv_rate"], inputs["acc_rate"]
+                        )
+                    ]
+                }
+                return output
+
+            self.store.apply(
+                [
+                    driver,
+                    driver_stats_source,
+                    driver_stats_fv,
+                    test_view,
+                ]
+            )
+            self.store.write_to_online_store(
+                feature_view_name="driver_hourly_stats", df=driver_df
+            )
+            # This will give the intuitive structure of the data as:
+            # {"driver_id": [..], "conv_rate": [..], "acc_rate": [..], "avg_daily_trips": [..]}
+            driver_dict = driver_df.to_dict(orient="list")
+            self.store.write_to_online_store(
+                feature_view_name="driver_hourly_stats",
+                input_dict=driver_dict,
+            )
+
+    def test_online_retrieval(self):
+        entity_rows = [
+            {
+                "driver_id": 1001,
+            }
+        ]
+
+        online_python_response = self.store.get_online_features(
+            entity_rows=entity_rows,
+            features=[
+                "driver_hourly_stats:conv_rate",
+                "driver_hourly_stats:acc_rate",
+                "test_view:conv_rate_plus_acc",
+            ],
+        ).to_dict()
+
+        assert len(online_python_response) == 4
+        assert all(
+            key in online_python_response.keys()
+            for key in [
+                "driver_id",
+                "acc_rate",
+                "conv_rate",
+                "conv_rate_plus_acc",
+            ]
+        )