Remove distutils from Python SDK (kubeflow#3010)

* Remove distutils from Python SDK

Signed-off-by: Xin Fu <xfu83@bloomberg.net>

* Clean up extra bracket

Signed-off-by: Xin Fu <xfu83@bloomberg.net>

---------

Signed-off-by: Xin Fu <xfu83@bloomberg.net>

python/kserve/kserve/model_server.py

@@ -18,7 +18,6 @@
 import multiprocessing
 import signal
 import socket
-from distutils.util import strtobool
 from multiprocessing import Process
 from typing import Dict, List, Optional, Union
 
@@ -48,13 +47,13 @@
                     help="The number of max processing threads in each worker.")
 parser.add_argument('--max_asyncio_workers', default=None, type=int,
                     help='Max number of asyncio workers to spawn')
-parser.add_argument("--enable_grpc", default=True, type=lambda x: bool(strtobool(x)),
+parser.add_argument("--enable_grpc", default=True, type=lambda x: utils.strtobool(x),
                     help="Enable gRPC for the model server")
-parser.add_argument("--enable_docs_url", default=False, type=lambda x: bool(strtobool(x)),
+parser.add_argument("--enable_docs_url", default=False, type=lambda x: utils.strtobool(x),
                     help="Enable docs url '/docs' to display Swagger UI.")
-parser.add_argument("--enable_latency_logging", default=True, type=lambda x: bool(strtobool(x)),
+parser.add_argument("--enable_latency_logging", default=True, type=lambda x: utils.strtobool(x),
                     help="Output a log per request with latency metrics.")
-parser.add_argument("--configure_logging", default=True, type=lambda x: bool(strtobool(x)),
+parser.add_argument("--configure_logging", default=True, type=lambda x: utils.strtobool(x),
                     help="Whether to configure KServe and Uvicorn logging")
 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.")

python/kserve/kserve/utils/utils.py

@@ -205,3 +205,22 @@ def get_predict_response(payload: Union[Dict, InferRequest], result: Union[np.nd
             infer_outputs=infer_outputs,
             response_id=generate_uuid()
         )
+
+
+def strtobool(val: str) -> bool:
+    """Convert a string representation of truth to True or False.
+
+    True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
+    are 'n', 'no', 'f', 'false', 'off', and '0'.  Raises ValueError if
+    'val' is anything else.
+
+    Adapted from deprecated `distutils`
+    https://github.com/python/cpython/blob/3.11/Lib/distutils/util.py
+    """
+    val = val.lower()
+    if val in ('y', 'yes', 't', 'true', 'on', '1'):
+        return True
+    elif val in ('n', 'no', 'f', 'false', 'off', '0'):
+        return False
+    else:
+        raise ValueError("invalid truth value %r" % (val,))