fix: fix the bug blocking completion template application (#17010)

Co-authored-by: xdtbynd <supercluster@vip.qq.com>
Co-authored-by: cy <chenyang08056032@163.com>
Co-authored-by: sglang-npu-bot <sglangnpu@163.com>

python/sglang/srt/managers/template_manager.py

@@ -30,6 +30,7 @@ from sglang.srt.parser.code_completion_parser import (
     FimPosition,
     completion_template_exists,
     register_completion_template,
+    set_completion_template,
 )
 from sglang.srt.parser.conversation import (
     Conversation,
@@ -199,6 +200,8 @@ class TemplateManager:
         else:
             self._completion_template_name = completion_template_arg
 
+        set_completion_template(self._completion_template_name)
+
     def initialize_templates(
         self,
         tokenizer_manager: TokenizerManager,

python/sglang/srt/parser/code_completion_parser.py

@@ -15,15 +15,16 @@
 
 import dataclasses
 import logging
-from enum import auto
+from enum import Enum, auto
+from typing import Optional
 
 from sglang.srt.entrypoints.openai.protocol import CompletionRequest
 
 logger = logging.getLogger(__name__)
-completion_template_name = None
+completion_template_name: Optional[str] = None
 
 
-class FimPosition:
+class FimPosition(Enum):
     """Position of fim middle token."""
 
     MIDDLE = auto()
@@ -68,6 +69,12 @@ def completion_template_exists(template_name: str) -> bool:
     return template_name in completion_templates
 
 
+def set_completion_template(template_name: str) -> None:
+    global completion_template_name
+    if completion_template_name is None:
+        completion_template_name = template_name
+
+
 def is_completion_template_defined() -> bool:
     global completion_template_name
     return completion_template_name is not None