Skip to content

Commit

Permalink
python: allow to override the UvicornServer's default log config
Browse files Browse the repository at this point in the history 
It is useful to be able to change Uvicorn's log settings, for example
to be able to change the access log's format.

The Uvicorn's Config class provides a "configure_logging" function
that is smart about the log_config parameter - if it is a string,
and not a dictionary, it is interpreted as a file containing
logging directives and that needs to be loaded from disk.
This is very convenient for the KServe use case: one can either use
the default config, hardcoded in a dictionary, or anything
provided as yaml or json file.

This change fixes also the default UvicornServer's config.

Sadly the current Uvicorn implementation doesn't support
changing the access log format, but they suggest to use
asgi-logger:

encode/uvicorn#947 (comment)

It seems the only way forward to allow a decent customization
of a vital sign like the access log.

Fixes: kserve#2778
Signed-off-by: Luca Toscano <[email protected]>
  • Loading branch information
@elukey
elukey committed Apr 1, 2023
1 parent cd30bfb commit 3044b05
Show file tree
Hide file tree
Showing 3 changed files with 74 additions and 39 deletions.
18 changes: 15 additions & 3 deletions python/kserve/kserve/model_server.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,10 @@
help="Enable docs url '/docs' to display Swagger UI.")
parser.add_argument("--enable_latency_logging", default=True, type=lambda x: bool(strtobool(x)),
help="Output a log per request with latency metrics.")
parser.add_argument("--log_config_file", default=None, type=str,
help="File path containing UvicornServer's log config. Needs to be a yaml or json file.")
parser.add_argument("--access_log_format", default=None, type=str,
help="Format to set for the access log (provided by asgi-logger).")

args, _ = parser.parse_known_args()

Expand All @@ -76,6 +80,7 @@ class ModelServer:
enable_grpc (bool): Whether to turn on grpc server. Default: ``True``
enable_docs_url (bool): Whether to turn on ``/docs`` Swagger UI. Default: ``False``.
enable_latency_logging (bool): Whether to log latency metric. Default: ``True``.
log_config_file (dict): File path containing UvicornServer's log config. Default: ``None``.
"""

def __init__(self, http_port: int = args.http_port,
Expand All @@ -86,7 +91,9 @@ def __init__(self, http_port: int = args.http_port,
registered_models: ModelRepository = ModelRepository(),
enable_grpc: bool = args.enable_grpc,
enable_docs_url: bool = args.enable_docs_url,
enable_latency_logging: bool = args.enable_latency_logging):
enable_latency_logging: bool = args.enable_latency_logging,
log_config_file: str = args.log_config_file,
access_log_format: str = args.access_log_format):
self.registered_models = registered_models
self.http_port = http_port
self.grpc_port = grpc_port
Expand All @@ -100,6 +107,8 @@ def __init__(self, http_port: int = args.http_port,
self.model_repository_extension = ModelRepositoryExtension(
model_registry=self.registered_models)
self._grpc_server = GRPCServer(grpc_port, self.dataplane, self.model_repository_extension)
self.log_config_file = log_config_file
self.access_log_format = access_log_format

def start(self, models: Union[List[Model], Dict[str, Deployment]]) -> None:
if isinstance(models, list):
Expand Down Expand Up @@ -143,7 +152,9 @@ async def serve():
sig, lambda s=sig: asyncio.create_task(self.stop(sig=s))
)
self._rest_server = UvicornServer(self.http_port, [serversocket],
self.dataplane, self.model_repository_extension, self.enable_docs_url)
self.dataplane, self.model_repository_extension,
self.enable_docs_url, log_config_file=self.log_config_file,
access_log_format=self.access_log_format)
if self.workers == 1:
await self._rest_server.run()
else:
Expand All @@ -153,7 +164,8 @@ async def serve():
# https://github.com/tiangolo/fastapi/issues/1586
multiprocessing.set_start_method('fork')
server = UvicornServer(self.http_port, [serversocket],
self.dataplane, self.model_repository_extension, self.enable_docs_url)
self.dataplane, self.model_repository_extension,
self.enable_docs_url, custom_log_config=self.log_config)
for _ in range(self.workers):
p = Process(target=server.run_sync)
p.start()
Expand Down
94 changes: 58 additions & 36 deletions python/kserve/kserve/protocol/rest/server.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@

import pkg_resources
import uvicorn
from asgi_logger import AccessLoggerMiddleware
from fastapi import FastAPI, Request, Response
from fastapi.routing import APIRoute as FastAPIRoute
from fastapi.responses import ORJSONResponse
Expand Down Expand Up @@ -124,7 +125,8 @@ def create_application(self) -> FastAPI:

class UvicornServer:
def __init__(self, http_port: int, sockets: List[socket.socket],
data_plane: DataPlane, model_repository_extension, enable_docs_url):
data_plane: DataPlane, model_repository_extension, enable_docs_url,
log_config_file: str = None, access_log_format: str = None):
super().__init__()
self.sockets = sockets
rest_server = RESTServer(data_plane, model_repository_extension, enable_docs_url)
Expand All @@ -134,46 +136,66 @@ def __init__(self, http_port: int, sockets: List[socket.socket],
client=PrintTimings(),
metric_namer=StarletteScopeToName(prefix="kserve.io", starlette_app=app)
)
log_config = {
"version": 1,
"formatters": {
"default": {
"()": "uvicorn.logging.DefaultFormatter",
"datefmt": DATE_FMT,
"fmt": "%(asctime)s.%(msecs)03d %(name)s %(levelprefix)s %(message)s",
"use_colors": None,
},
"access": {
"()": "uvicorn.logging.AccessFormatter",
"datefmt": DATE_FMT,
"fmt": '%(asctime)s.%(msecs)03d %(name)s %(levelprefix)s %(client_addr)s %(process)s - '
'"%(request_line)s" %(status_code)s',
# noqa: E501
},
},
"handlers": {
"default": {
"formatter": "default",
"class": "logging.StreamHandler",
"stream": "ext://sys.stderr",
},
"access": {
"formatter": "access",
"class": "logging.StreamHandler",
"stream": "ext://sys.stdout",
},
},
"loggers": {
"uvicorn": {"handlers": ["default"], "level": "INFO"},
"uvicorn.error": {"level": "INFO"},
"uvicorn.access": {"handlers": ["access"], "level": "INFO", "propagate": False},
},
}

# If the log_config value is a string ending up with ".json"
# or ".yaml", it is interpreted as file path and the log configuration
# is loaded from disk.
if log_config_file:
log_config = log_config_file

self.cfg = uvicorn.Config(
app=app,
host="0.0.0.0",
log_config=log_config,
port=http_port,
log_config={
"version": 1,
"formatters": {
"default": {
"()": "uvicorn.logging.DefaultFormatter",
"datefmt": DATE_FMT,
"fmt": "%(asctime)s.%(msecs)03d %(name)s %(levelprefix)s %(message)s",
"use_colors": None,
},
"access": {
"()": "uvicorn.logging.AccessFormatter",
"datefmt": DATE_FMT,
"fmt": '%(asctime)s.%(msecs)03d %(name)s %(levelprefix)s %(client_addr)s %(process)s - '
'"%(request_line)s" %(status_code)s',
# noqa: E501
},
},
"rest": {
"default": {
"formatter": "default",
"class": "logging.StreamHandler",
"stream": "ext://sys.stderr",
},
"access": {
"formatter": "access",
"class": "logging.StreamHandler",
"stream": "ext://sys.stdout",
},
},
"loggers": {
"uvicorn": {"rest": ["default"], "level": "INFO"},
"uvicorn.error": {"level": "INFO"},
"uvicorn.access": {"rest": ["access"], "level": "INFO", "propagate": False},
},
}
)

# More context in https://github.com/encode/uvicorn/pull/947
# At the time of writing the ASGI specs are not clear when it comes
# to change the access log format, and hence the Uvicorn upstream devs
# chose to create a custom middleware for this.
# The allowed log format is specified in https://github.com/Kludex/asgi-logger#usage
if access_log_format:
logging.getLogger("uvicorn.access").handlers = []
app.add_middleware(
AccessLoggerMiddleware, format=access_log_format,
logger=logging.getLogger("uvicorn.access"))

self.server = _NoSignalUvicornServer(config=self.cfg)

def run_sync(self):
Expand Down
1 change: 1 addition & 0 deletions python/kserve/requirements.txt
View file
Original file line number Diff line number Diff line change
Expand Up @@ -19,3 +19,4 @@ orjson>=3.8.0
httpx>=0.23.0
fastapi>=0.85.0,<=0.88.0
timing_asgi>=0.3.0
asgi-logger>=0.1.0

0 comments on commit 3044b05

Please sign in to comment.