[CI] fix dump_input for str type (#18697)

Signed-off-by: Andy Xie <andy.xning@gmail.com>

tests/test_logger.py

 # SPDX-License-Identifier: Apache-2.0
-
+import enum
 import json
 import logging
 import os
 import sys
 import tempfile
+from dataclasses import dataclass
 from json.decoder import JSONDecodeError
 from tempfile import NamedTemporaryFile
 from typing import Any
@@ -16,6 +17,7 @@ import pytest
 from vllm.logger import (_DATE_FORMAT, _FORMAT, _configure_vllm_root_logger,
                          enable_trace_function_call, init_logger)
 from vllm.logging_utils import NewLineFormatter
+from vllm.logging_utils.dump_input import prepare_object_to_dump
 
 
 def f1(x):
@@ -216,3 +218,37 @@ def test_custom_logging_config_causes_an_error_if_configure_logging_is_off():
         assert other_logger.handlers != root_logger.handlers
         assert other_logger.level != root_logger.level
         assert other_logger.propagate
+
+
+def test_prepare_object_to_dump():
+    str_obj = 'str'
+    assert prepare_object_to_dump(str_obj) == "'str'"
+
+    list_obj = [1, 2, 3]
+    assert prepare_object_to_dump(list_obj) == '[1, 2, 3]'
+
+    dict_obj = {'a': 1, 'b': 'b'}
+    assert prepare_object_to_dump(dict_obj) in [
+        "{a: 1, b: 'b'}", "{b: 'b', a: 1}"
+    ]
+
+    set_obj = {1, 2, 3}
+    assert prepare_object_to_dump(set_obj) == '[1, 2, 3]'
+
+    tuple_obj = ('a', 'b', 'c')
+    assert prepare_object_to_dump(tuple_obj) == "['a', 'b', 'c']"
+
+    class CustomEnum(enum.Enum):
+        A = enum.auto()
+        B = enum.auto()
+        C = enum.auto()
+
+    assert prepare_object_to_dump(CustomEnum.A) == repr(CustomEnum.A)
+
+    @dataclass
+    class CustomClass:
+        a: int
+        b: str
+
+    assert (prepare_object_to_dump(CustomClass(
+        1, 'b')) == "CustomClass(a=1, b='b')")

vllm/logging_utils/dump_input.py

@@ -18,7 +18,7 @@ logger = init_logger(__name__)
 
 def prepare_object_to_dump(obj) -> str:
     if isinstance(obj, str):
-        return "'{obj}'"  # Double quotes
+        return f"'{obj}'"  # Double quotes
     elif isinstance(obj, dict):
         dict_str = ', '.join({f'{str(k)}: {prepare_object_to_dump(v)}' \
             for k, v in obj.items()})
@@ -42,9 +42,9 @@ def prepare_object_to_dump(obj) -> str:
         return obj.anon_repr()
     elif hasattr(obj, '__dict__'):
         items = obj.__dict__.items()
-        dict_str = ','.join([f'{str(k)}={prepare_object_to_dump(v)}' \
+        dict_str = ', '.join([f'{str(k)}={prepare_object_to_dump(v)}' \
             for k, v in items])
-        return (f"{type(obj).__name__}({dict_str})")
+        return f"{type(obj).__name__}({dict_str})"
     else:
         # Hacky way to make sure we can serialize the object in JSON format
         try: