feat: add disable_ping_events flag (#1257)

for backward compatibility, this is false by default

it can be set to true to disable EventSource pings
which are not supported by some OpenAI clients.

fixes https://github.com/abetlen/llama-cpp-python/issues/1256

llama_cpp/server/app.py

@@ -87,6 +87,13 @@ def get_llama_proxy():
             llama_outer_lock.release()
 
 
+_ping_message_factory = None
+
+def set_ping_message_factory(factory):
+   global  _ping_message_factory
+   _ping_message_factory = factory
+
+
 def create_app(
     settings: Settings | None = None,
     server_settings: ServerSettings | None = None,
@@ -138,6 +145,9 @@ def create_app(
     assert model_settings is not None
     set_llama_proxy(model_settings=model_settings)
 
+    if server_settings.disable_ping_events:
+        set_ping_message_factory(lambda: bytes())
+
     return app
 
 
@@ -302,6 +312,7 @@ async def create_completion(
                 iterator=iterator(),
             ),
             sep="\n",
+            ping_message_factory=_ping_message_factory,
         )
     else:
         return iterator_or_completion
@@ -470,6 +481,7 @@ async def create_chat_completion(
                 iterator=iterator(),
             ),
             sep="\n",
+            ping_message_factory=_ping_message_factory,
         )
     else:
         return iterator_or_completion

llama_cpp/server/settings.py

@@ -195,6 +195,10 @@ class ServerSettings(BaseSettings):
         default=True,
         description="Whether to interrupt requests when a new request is received.",
     )
+    disable_ping_events: bool = Field(
+        default=False,
+        description="Disable EventSource pings (may be needed for some clients).",
+    )
 
 
 class Settings(ServerSettings, ModelSettings):