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feature_server.py
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1163 lines (1001 loc) · 42.2 KB
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# Copyright 2025 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 asyncio
import os
import sys
import threading
import time
import traceback
from collections import defaultdict
from contextlib import asynccontextmanager
from datetime import datetime
from importlib import resources as importlib_resources
from types import SimpleNamespace
from typing import Any, DefaultDict, Dict, List, NamedTuple, Optional, Set, Union
import pandas as pd
from dateutil import parser
from fastapi import (
Depends,
FastAPI,
Request,
Response,
WebSocket,
WebSocketDisconnect,
status,
)
from fastapi.concurrency import run_in_threadpool
from fastapi.logger import logger
from fastapi.responses import JSONResponse
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel, field_validator
import feast
from feast import metrics as feast_metrics
from feast import proto_json, utils
from feast.constants import DEFAULT_FEATURE_SERVER_REGISTRY_TTL
from feast.data_source import PushMode
from feast.errors import (
FeastError,
)
from feast.feast_object import FeastObject
from feast.feature_server_utils import convert_response_to_dict
from feast.feature_view_utils import get_feature_view_from_feature_store
from feast.permissions.action import WRITE, AuthzedAction
from feast.permissions.security_manager import (
assert_permissions,
get_security_manager,
is_auth_necessary,
)
from feast.permissions.server.rest import inject_user_details
from feast.permissions.server.utils import (
ServerType,
init_auth_manager,
init_security_manager,
str_to_auth_manager_type,
)
# TODO: deprecate this in favor of push features
class WriteToFeatureStoreRequest(BaseModel):
feature_view_name: str
df: dict
allow_registry_cache: bool = True
transform_on_write: bool = True
class PushFeaturesRequest(BaseModel):
push_source_name: str
df: dict
allow_registry_cache: bool = True
to: str = "online"
transform_on_write: bool = True
class MaterializeRequest(BaseModel):
start_ts: Optional[str] = None
end_ts: Optional[str] = None
feature_views: Optional[List[str]] = None
disable_event_timestamp: bool = False
full_feature_names: bool = False
class MaterializeIncrementalRequest(BaseModel):
end_ts: str
feature_views: Optional[List[str]] = None
full_feature_names: bool = False
class GetOnlineFeaturesRequest(BaseModel):
entities: Dict[str, List[Any]]
feature_service: Optional[str] = None
features: List[str] = []
full_feature_names: bool = False
include_feature_view_version_metadata: bool = False
class GetOnlineDocumentsRequest(BaseModel):
feature_service: Optional[str] = None
features: List[str] = []
full_feature_names: bool = False
include_feature_view_version_metadata: bool = False
top_k: Optional[int] = None
query: Optional[List[float]] = None
query_string: Optional[str] = None
api_version: Optional[int] = 1
class FeatureVectorResponse(BaseModel):
values: List[Any] = []
statuses: List[str] = []
event_timestamps: List[str] = []
class OnlineFeaturesMetadataResponse(BaseModel):
feature_names: List[str] = []
@field_validator("feature_names", mode="before")
@classmethod
def _unwrap_feature_list(cls, v: Any) -> Any:
"""Accept both the proto_json-patched flat list and the raw
protobuf ``{"val": [...]}`` dict produced by ``MessageToDict``
when the monkey-patch is absent or ineffective."""
if isinstance(v, dict) and "val" in v:
return v["val"]
return v
class OnlineFeaturesResponse(BaseModel):
metadata: Optional[OnlineFeaturesMetadataResponse] = None
results: List[FeatureVectorResponse] = []
status: Optional[bool] = None
class ChatMessage(BaseModel):
role: str
content: str
class ChatRequest(BaseModel):
messages: List[ChatMessage]
def _parse_feature_info(
features: Union[List[str], "feast.FeatureService"],
) -> tuple:
"""Return ``(feature_view_names, feature_count)`` from resolved features.
``features`` is either a list of ``"feature_view:feature"`` strings or
a ``FeatureService`` with ``feature_view_projections``.
Returns:
(fv_names, feat_count) where fv_names is a list of unique feature
view name strings and feat_count is the total number of features.
"""
from feast.feature_service import FeatureService
from feast.utils import _parse_feature_ref
if isinstance(features, FeatureService):
projections = features.feature_view_projections
fv_names = [p.name for p in projections]
feat_count = sum(len(p.features) for p in projections)
elif isinstance(features, list):
feat_count = len(features)
fv_names = list({_parse_feature_ref(ref)[0] for ref in features if ":" in ref})
else:
fv_names = []
feat_count = 0
return fv_names, feat_count
def _resolve_feature_counts(
features: Union[List[str], "feast.FeatureService"],
) -> tuple:
"""Return ``(feature_count_str, feature_view_count_str)`` for Prometheus labels."""
fv_names, feat_count = _parse_feature_info(features)
return str(feat_count), str(len(fv_names))
def _emit_online_audit(
request: GetOnlineFeaturesRequest,
features: Union[List[str], "feast.FeatureService"],
entity_count: int,
status: str,
latency_ms: float,
):
"""Best-effort audit log emission for online feature requests."""
try:
from feast.permissions.security_manager import get_security_manager
requestor_id = "anonymous"
sm = get_security_manager()
if sm and sm.current_user:
requestor_id = sm.current_user.username or "anonymous"
fv_names, feat_count = _parse_feature_info(features)
feast_metrics.emit_online_audit_log(
requestor_id=requestor_id,
entity_keys=list(request.entities.keys()),
entity_count=entity_count,
feature_views=fv_names,
feature_count=feat_count,
status=status,
latency_ms=latency_ms,
)
except Exception:
logger.warning("Failed to emit online audit log", exc_info=True)
async def _get_features(
request: Union[GetOnlineFeaturesRequest, GetOnlineDocumentsRequest],
store: "feast.FeatureStore",
):
if request.feature_service:
feature_service = await run_in_threadpool(
store.get_feature_service, request.feature_service, allow_cache=True
)
assert_permissions(
resource=feature_service, actions=[AuthzedAction.READ_ONLINE]
)
features = feature_service # type: ignore
elif is_auth_necessary(get_security_manager()):
all_feature_views, all_on_demand_feature_views = await run_in_threadpool(
utils._get_feature_views_to_use,
store.registry,
store.project,
request.features,
allow_cache=True,
hide_dummy_entity=False,
)
for feature_view in all_feature_views:
assert_permissions(
resource=feature_view, actions=[AuthzedAction.READ_ONLINE]
)
for od_feature_view in all_on_demand_feature_views:
assert_permissions(
resource=od_feature_view, actions=[AuthzedAction.READ_ONLINE]
)
features = request.features # type: ignore
else:
features = request.features # type: ignore
return features
async def load_static_artifacts(app: FastAPI, store):
"""
Load static artifacts (models, lookup tables, etc.) into app.state.
This function can be extended to load various types of static artifacts:
- Small ML models (scikit-learn, small neural networks)
- Lookup tables and reference data
- Configuration parameters
- Pre-computed embeddings
Note: Not recommended for large language models - use dedicated
model serving solutions (vLLM, TGI, etc.) for those.
"""
try:
# Import here to avoid loading heavy dependencies unless needed
import importlib.util
import inspect
from pathlib import Path
# Look for static artifacts loading in the feature repository
# This allows templates and users to define their own artifact loading
repo_path = Path(store.repo_path) if store.repo_path else Path.cwd()
artifacts_file = repo_path / "static_artifacts.py"
if artifacts_file.exists():
# Load and execute custom static artifacts loading
spec = importlib.util.spec_from_file_location(
"static_artifacts", artifacts_file
)
if spec and spec.loader:
artifacts_module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(artifacts_module)
# Look for load_artifacts function
if hasattr(artifacts_module, "load_artifacts"):
load_func = artifacts_module.load_artifacts
if inspect.iscoroutinefunction(load_func):
await load_func(app)
else:
load_func(app)
logger.info("Loaded static artifacts from static_artifacts.py")
except Exception as e:
# Non-fatal error - feature server should still start
logger.warning(f"Failed to load static artifacts: {e}")
def get_app(
store: "feast.FeatureStore",
registry_ttl_sec: int = DEFAULT_FEATURE_SERVER_REGISTRY_TTL,
):
"""
Creates a FastAPI app that can be used to start a feature server.
Args:
store: The FeatureStore to use for serving features
registry_ttl_sec: The TTL in seconds for the registry cache
Returns:
A FastAPI app
Example:
```python
from feast import FeatureStore
store = FeatureStore(repo_path="feature_repo")
app = get_app(store)
```
The app provides the following endpoints:
- `/get-online-features`: Get online features
- `/retrieve-online-documents`: Retrieve online documents
- `/push`: Push features to the feature store
- `/write-to-online-store`: Write to the online store
- `/health`: Health check
- `/materialize`: Materialize features
- `/materialize-incremental`: Materialize features incrementally
- `/chat`: Chat UI
- `/ws/chat`: WebSocket endpoint for chat
MCP Support:
- If MCP is enabled in feature server configuration, MCP endpoints will be added automatically
"""
proto_json.patch()
# Asynchronously refresh registry, notifying shutdown and canceling the active timer if the app is shutting down
shutting_down = False
active_timer: Optional[threading.Timer] = None
# --- Offline write batching config and batcher ---
fs_cfg = getattr(store.config, "feature_server", None)
batching_cfg = None
if fs_cfg is not None:
enabled = getattr(fs_cfg, "offline_push_batching_enabled", False)
batch_size = getattr(fs_cfg, "offline_push_batching_batch_size", None)
batch_interval_seconds = getattr(
fs_cfg, "offline_push_batching_batch_interval_seconds", None
)
if enabled is True:
size_ok = isinstance(batch_size, int) and not isinstance(batch_size, bool)
interval_ok = isinstance(batch_interval_seconds, int) and not isinstance(
batch_interval_seconds, bool
)
if size_ok and interval_ok:
batching_cfg = SimpleNamespace(
enabled=True,
batch_size=batch_size,
batch_interval_seconds=batch_interval_seconds,
)
else:
logger.warning(
"Offline write batching enabled but missing or invalid numeric values; "
"disabling batching (batch_size=%r, batch_interval_seconds=%r)",
batch_size,
batch_interval_seconds,
)
offline_batcher: Optional[OfflineWriteBatcher] = None
if batching_cfg is not None and batching_cfg.enabled is True:
offline_batcher = OfflineWriteBatcher(store=store, cfg=batching_cfg)
logger.debug("Offline write batching is ENABLED")
else:
logger.debug("Offline write batching is DISABLED")
def stop_refresh():
nonlocal shutting_down
shutting_down = True
if active_timer:
active_timer.cancel()
def async_refresh():
if shutting_down:
return
store.refresh_registry()
if registry_ttl_sec:
nonlocal active_timer
active_timer = threading.Timer(registry_ttl_sec, async_refresh)
active_timer.start()
@asynccontextmanager
async def lifespan(app: FastAPI):
# Load static artifacts before initializing store
await load_static_artifacts(app, store)
await store.initialize()
async_refresh()
try:
yield
finally:
stop_refresh()
if offline_batcher is not None:
offline_batcher.shutdown()
await store.close()
app = FastAPI(lifespan=lifespan)
@app.post(
"/get-online-features",
dependencies=[Depends(inject_user_details)],
response_model=OnlineFeaturesResponse,
)
async def get_online_features(request: GetOnlineFeaturesRequest) -> Any:
with feast_metrics.track_request_latency(
"/get-online-features",
) as metrics_ctx:
features = await _get_features(request, store)
feat_count, fv_count = _resolve_feature_counts(features)
metrics_ctx.feature_count = feat_count
metrics_ctx.feature_view_count = fv_count
entity_count = len(next(iter(request.entities.values()), []))
feast_metrics.track_online_features_entities(entity_count)
read_params = dict(
features=features,
entity_rows=request.entities,
full_feature_names=request.full_feature_names,
include_feature_view_version_metadata=request.include_feature_view_version_metadata,
)
audit_start_ms = time.monotonic() * 1000
audit_status = "success"
try:
if store._get_provider().async_supported.online.read:
response = await store.get_online_features_async(**read_params) # type: ignore
else:
response = await run_in_threadpool(
lambda: store.get_online_features(**read_params) # type: ignore
)
except Exception:
audit_status = "error"
raise
finally:
audit_latency_ms = time.monotonic() * 1000 - audit_start_ms
_emit_online_audit(
request, features, entity_count, audit_status, audit_latency_ms
)
response_dict = await run_in_threadpool(
convert_response_to_dict, response.proto
)
return JSONResponse(content=response_dict)
@app.post(
"/retrieve-online-documents",
dependencies=[Depends(inject_user_details)],
response_model=OnlineFeaturesResponse,
)
async def retrieve_online_documents(
request: GetOnlineDocumentsRequest,
) -> Any:
with feast_metrics.track_request_latency("/retrieve-online-documents"):
logger.warning(
"This endpoint is in alpha and will be moved to /get-online-features when stable."
)
features = await _get_features(request, store)
read_params = dict(
features=features,
query=request.query,
top_k=request.top_k,
)
if request.api_version == 2 and request.query_string is not None:
read_params["query_string"] = request.query_string
if request.api_version == 2:
read_params["include_feature_view_version_metadata"] = (
request.include_feature_view_version_metadata
)
response = await run_in_threadpool(
lambda: store.retrieve_online_documents_v2(**read_params) # type: ignore
)
else:
response = await run_in_threadpool(
lambda: store.retrieve_online_documents(**read_params) # type: ignore
)
response_dict = await run_in_threadpool(
convert_response_to_dict, response.proto
)
return JSONResponse(content=response_dict)
@app.post("/push", dependencies=[Depends(inject_user_details)])
async def push(request: PushFeaturesRequest) -> Response:
with feast_metrics.track_request_latency("/push"):
df = pd.DataFrame(request.df)
actions = []
if request.to == "offline":
to = PushMode.OFFLINE
actions = [AuthzedAction.WRITE_OFFLINE]
elif request.to == "online":
to = PushMode.ONLINE
actions = [AuthzedAction.WRITE_ONLINE]
elif request.to == "online_and_offline":
to = PushMode.ONLINE_AND_OFFLINE
actions = WRITE
else:
raise ValueError(
f"{request.to} is not a supported push format. Please specify one of these ['online', 'offline', 'online_and_offline']."
)
from feast.data_source import PushSource
all_fvs = store.list_feature_views(
allow_cache=request.allow_registry_cache
) + store.list_stream_feature_views(
allow_cache=request.allow_registry_cache
)
fvs_with_push_sources = {
fv
for fv in all_fvs
if (
fv.stream_source is not None
and isinstance(fv.stream_source, PushSource)
and fv.stream_source.name == request.push_source_name
)
}
for feature_view in fvs_with_push_sources:
assert_permissions(resource=feature_view, actions=actions)
async def _push_with_to(push_to: PushMode) -> None:
"""
Helper for performing a single push operation.
NOTE:
- Feast providers **do not currently support async offline writes**.
- Therefore:
* ONLINE and ONLINE_AND_OFFLINE → may be async, depending on provider.async_supported.online.write
* OFFLINE → always synchronous, but executed via run_in_threadpool when called from HTTP handlers.
- The OfflineWriteBatcher handles offline writes directly in its own background thread, but the offline store writes are currently synchronous only.
"""
push_source_name = request.push_source_name
allow_registry_cache = request.allow_registry_cache
transform_on_write = request.transform_on_write
# Async currently only applies to online store writes (ONLINE / ONLINE_AND_OFFLINE paths) as theres no async for offline store
if push_to in (PushMode.ONLINE, PushMode.ONLINE_AND_OFFLINE) and (
store._get_provider().async_supported.online.write
):
await store.push_async(
push_source_name=push_source_name,
df=df,
allow_registry_cache=allow_registry_cache,
to=push_to,
transform_on_write=transform_on_write,
)
else:
await run_in_threadpool(
lambda: store.push(
push_source_name=push_source_name,
df=df,
allow_registry_cache=allow_registry_cache,
to=push_to,
transform_on_write=transform_on_write,
)
)
needs_online = to in (PushMode.ONLINE, PushMode.ONLINE_AND_OFFLINE)
needs_offline = to in (PushMode.OFFLINE, PushMode.ONLINE_AND_OFFLINE)
status_code = status.HTTP_200_OK
if offline_batcher is None or not needs_offline:
await _push_with_to(to)
else:
if needs_online:
await _push_with_to(PushMode.ONLINE)
offline_batcher.enqueue(
push_source_name=request.push_source_name,
df=df,
allow_registry_cache=request.allow_registry_cache,
transform_on_write=request.transform_on_write,
)
status_code = status.HTTP_202_ACCEPTED
feast_metrics.track_push(request.push_source_name, request.to)
return Response(status_code=status_code)
async def _get_feast_object(
feature_view_name: str, allow_registry_cache: bool
) -> FeastObject:
return await run_in_threadpool(
get_feature_view_from_feature_store,
store,
feature_view_name,
allow_registry_cache,
)
@app.post("/write-to-online-store", dependencies=[Depends(inject_user_details)])
async def write_to_online_store(request: WriteToFeatureStoreRequest) -> None:
df = pd.DataFrame(request.df)
feature_view_name = request.feature_view_name
allow_registry_cache = request.allow_registry_cache
resource = await _get_feast_object(feature_view_name, allow_registry_cache)
assert_permissions(resource=resource, actions=[AuthzedAction.WRITE_ONLINE])
await run_in_threadpool(
store.write_to_online_store,
feature_view_name=feature_view_name,
df=df,
allow_registry_cache=allow_registry_cache,
transform_on_write=request.transform_on_write,
)
@app.get("/health")
async def health():
try:
store.registry.list_projects(allow_cache=True)
return Response(status_code=status.HTTP_200_OK)
except Exception:
return Response(status_code=status.HTTP_503_SERVICE_UNAVAILABLE)
@app.post("/chat")
async def chat(request: ChatRequest):
# Process the chat request
# For now, just return dummy text
return {"response": "This is a dummy response from the Feast feature server."}
@app.get("/chat")
async def chat_ui():
# Serve the chat UI
static_dir_ref = importlib_resources.files(__spec__.parent) / "static/chat" # type: ignore[name-defined, arg-type]
with importlib_resources.as_file(static_dir_ref) as static_dir:
with open(os.path.join(static_dir, "index.html")) as f:
content = f.read()
return Response(content=content, media_type="text/html")
@app.post("/materialize", dependencies=[Depends(inject_user_details)])
async def materialize(request: MaterializeRequest) -> None:
with feast_metrics.track_request_latency("/materialize"):
if request.feature_views:
for feature_view in request.feature_views:
resource = await _get_feast_object(feature_view, True)
assert_permissions(
resource=resource,
actions=[AuthzedAction.WRITE_ONLINE],
)
else:
feature_views_to_materialize = store._get_feature_views_to_materialize(
None
)
for fv in feature_views_to_materialize:
assert_permissions(
resource=fv,
actions=[AuthzedAction.WRITE_ONLINE],
)
if request.disable_event_timestamp:
now = datetime.now()
start_date = datetime(1970, 1, 1)
end_date = now
else:
if not request.start_ts or not request.end_ts:
raise ValueError(
"start_ts and end_ts are required when disable_event_timestamp is False"
)
start_date = utils.make_tzaware(parser.parse(request.start_ts))
end_date = utils.make_tzaware(parser.parse(request.end_ts))
await run_in_threadpool(
store.materialize,
start_date,
end_date,
request.feature_views,
disable_event_timestamp=request.disable_event_timestamp,
full_feature_names=request.full_feature_names,
)
@app.post("/materialize-incremental", dependencies=[Depends(inject_user_details)])
async def materialize_incremental(request: MaterializeIncrementalRequest) -> None:
with feast_metrics.track_request_latency("/materialize-incremental"):
if request.feature_views:
for feature_view in request.feature_views:
resource = await _get_feast_object(feature_view, True)
assert_permissions(
resource=resource,
actions=[AuthzedAction.WRITE_ONLINE],
)
else:
feature_views_to_materialize = store._get_feature_views_to_materialize(
None
)
for fv in feature_views_to_materialize:
assert_permissions(
resource=fv,
actions=[AuthzedAction.WRITE_ONLINE],
)
await run_in_threadpool(
store.materialize_incremental,
utils.make_tzaware(parser.parse(request.end_ts)),
request.feature_views,
full_feature_names=request.full_feature_names,
)
@app.exception_handler(Exception)
async def rest_exception_handler(request: Request, exc: Exception):
# Print the original exception on the server side
logger.exception(traceback.format_exc())
if isinstance(exc, FeastError):
return JSONResponse(
status_code=exc.http_status_code(),
content=exc.to_error_detail(),
)
else:
return JSONResponse(
status_code=500,
content=str(exc),
)
# Chat WebSocket connection manager
class ConnectionManager:
def __init__(self):
self.active_connections: List[WebSocket] = []
async def connect(self, websocket: WebSocket):
await websocket.accept()
self.active_connections.append(websocket)
def disconnect(self, websocket: WebSocket):
self.active_connections.remove(websocket)
async def send_message(self, message: str, websocket: WebSocket):
await websocket.send_text(message)
manager = ConnectionManager()
MAX_WS_CONNECTIONS = 5
MAX_MESSAGE_SIZE = 4096
MAX_MESSAGES_PER_MINUTE = 60
WS_READ_TIMEOUT_SEC = 60
@app.websocket("/ws/chat")
async def websocket_endpoint(websocket: WebSocket):
if len(manager.active_connections) >= MAX_WS_CONNECTIONS:
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
return
await manager.connect(websocket)
message_timestamps: List[float] = []
try:
while True:
try:
message = await asyncio.wait_for(
websocket.receive_text(), timeout=WS_READ_TIMEOUT_SEC
)
except asyncio.TimeoutError:
await websocket.close(code=status.WS_1001_GOING_AWAY)
return
if len(message) > MAX_MESSAGE_SIZE:
await websocket.close(code=status.WS_1009_MESSAGE_TOO_BIG)
return
now = time.time()
cutoff = now - 60
message_timestamps = [ts for ts in message_timestamps if ts >= cutoff]
if len(message_timestamps) >= MAX_MESSAGES_PER_MINUTE:
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
return
message_timestamps.append(now)
# Process the received message (currently unused but kept for future implementation)
# For now, just return dummy text
response = f"You sent: '{message}'. This is a dummy response from the Feast feature server."
# Stream the response word by word
words = response.split()
for word in words:
await manager.send_message(word + " ", websocket)
await asyncio.sleep(0.1) # Add a small delay between words
except WebSocketDisconnect:
manager.disconnect(websocket)
# Mount static files
static_dir_ref = importlib_resources.files(__spec__.parent) / "static" # type: ignore[name-defined, arg-type]
with importlib_resources.as_file(static_dir_ref) as static_dir:
app.mount("/static", StaticFiles(directory=static_dir), name="static")
# Add MCP support if enabled in feature server configuration
_add_mcp_support_if_enabled(app, store)
return app
def _add_mcp_support_if_enabled(app, store: "feast.FeatureStore"):
"""Add MCP support to the FastAPI app if enabled in configuration."""
mcp_transport_not_supported_error = None
try:
# Check if MCP is enabled in feature server config
if (
store.config.feature_server
and hasattr(store.config.feature_server, "type")
and store.config.feature_server.type == "mcp"
and getattr(store.config.feature_server, "mcp_enabled", False)
):
try:
from feast.infra.mcp_servers.mcp_server import (
McpTransportNotSupportedError,
add_mcp_support_to_app,
)
mcp_transport_not_supported_error = McpTransportNotSupportedError
except ImportError as e:
logger.error(f"Error checking/adding MCP support: {e}")
return
mcp_server = add_mcp_support_to_app(app, store, store.config.feature_server)
if mcp_server:
logger.info("MCP support has been enabled for the Feast feature server")
else:
logger.warning("MCP support was requested but could not be enabled")
else:
logger.debug("MCP support is not enabled in feature server configuration")
except Exception as e:
if mcp_transport_not_supported_error and isinstance(
e, mcp_transport_not_supported_error
):
raise
logger.error(f"Error checking/adding MCP support: {e}")
# Don't fail the entire server if MCP fails to initialize
if sys.platform != "win32":
import gunicorn.app.base
class FeastServeApplication(gunicorn.app.base.BaseApplication):
def __init__(
self, store: "feast.FeatureStore", metrics_enabled: bool = False, **options
):
self._app = get_app(
store=store,
registry_ttl_sec=options["registry_ttl_sec"],
)
self._options = options
self._metrics_enabled = metrics_enabled
super().__init__()
def load_config(self):
for key, value in self._options.items():
if key.lower() in self.cfg.settings and value is not None:
self.cfg.set(key.lower(), value)
self.cfg.set("worker_class", "uvicorn_worker.UvicornWorker")
if self._metrics_enabled:
self.cfg.set("post_worker_init", _gunicorn_post_worker_init)
self.cfg.set("child_exit", _gunicorn_child_exit)
def load(self):
return self._app
def _gunicorn_post_worker_init(worker):
"""Start per-worker resource monitoring after Gunicorn forks."""
feast_metrics.init_worker_monitoring()
def _gunicorn_child_exit(server, worker):
"""Clean up Prometheus metric files for a dead worker."""
feast_metrics.mark_process_dead(worker.pid)
def start_server(
store: "feast.FeatureStore",
host: str,
port: int,
no_access_log: bool,
workers: int,
worker_connections: int,
max_requests: int,
max_requests_jitter: int,
keep_alive_timeout: int,
registry_ttl_sec: int,
tls_key_path: str,
tls_cert_path: str,
metrics: bool,
):
if (tls_key_path and not tls_cert_path) or (not tls_key_path and tls_cert_path):
raise ValueError(
"Both key and cert file paths are required to start server in TLS mode."
)
fs_cfg = getattr(store.config, "feature_server", None)
metrics_cfg = getattr(fs_cfg, "metrics", None)
metrics_from_config = getattr(metrics_cfg, "enabled", False)
metrics_active = metrics or metrics_from_config
uses_gunicorn = sys.platform != "win32"
if metrics_active:
flags = feast_metrics.build_metrics_flags(metrics_cfg)
feast_metrics.start_metrics_server(
store,
metrics_config=flags,
start_resource_monitoring=not uses_gunicorn,
)
logger.debug("start_server called")
auth_type = str_to_auth_manager_type(store.config.auth_config.type)
logger.info(f"Auth type: {auth_type}")
init_security_manager(auth_type=auth_type, fs=store)
logger.debug("Security manager initialized successfully")
init_auth_manager(
auth_type=auth_type,
server_type=ServerType.REST,
auth_config=store.config.auth_config,
)
logger.debug("Auth manager initialized successfully")
if uses_gunicorn:
options = {
"bind": f"{host}:{port}",
"accesslog": None if no_access_log else "-",
"workers": workers,
"worker_connections": worker_connections,
"max_requests": max_requests,
"max_requests_jitter": max_requests_jitter,
"keepalive": keep_alive_timeout,
"registry_ttl_sec": registry_ttl_sec,
}
# Add SSL options if the paths exist
if tls_key_path and tls_cert_path:
options["keyfile"] = tls_key_path
options["certfile"] = tls_cert_path
FeastServeApplication(
store=store, metrics_enabled=metrics_active, **options
).run()
else:
import uvicorn
app = get_app(store, registry_ttl_sec)
if tls_key_path and tls_cert_path:
uvicorn.run(
app,
host=host,
port=port,
access_log=(not no_access_log),
ssl_keyfile=tls_key_path,
ssl_certfile=tls_cert_path,
)
else:
uvicorn.run(app, host=host, port=port, access_log=(not no_access_log))
class _OfflineBatchKey(NamedTuple):
push_source_name: str
allow_registry_cache: bool
transform_on_write: bool
class OfflineWriteBatcher:
"""
In-process offline write batcher for /push requests.
- Buffers DataFrames per (push_source_name, allow_registry_cache, transform_on_write)
- Flushes when either:
* total rows in a buffer >= batch_size, or
* time since last flush >= batch_interval_seconds
- Flush runs in a dedicated background thread so the HTTP event loop stays unblocked.
"""
def __init__(self, store: "feast.FeatureStore", cfg: Any):
self._store = store
self._cfg = cfg
# Buffers and timestamps keyed by batch key
self._buffers: DefaultDict[_OfflineBatchKey, List[pd.DataFrame]] = defaultdict(
list
)
self._last_flush: DefaultDict[_OfflineBatchKey, float] = defaultdict(time.time)
self._inflight: Set[_OfflineBatchKey] = set()
self._lock = threading.Lock()
self._stop_event = threading.Event()
# Start background flusher thread
self._thread = threading.Thread(
target=self._run, name="offline_write_batcher", daemon=True
)
self._thread.start()
logger.debug(
"OfflineWriteBatcher initialized: batch_size=%s, batch_interval_seconds=%s",
getattr(cfg, "batch_size", None),
getattr(cfg, "batch_interval_seconds", None),
)