Model: Add abort on generation

When the model is processing a prompt, add the ability to abort
on request cancellation. This is also a catch for a SIGINT.

Signed-off-by: kingbri <bdashore3@proton.me>

backends/exllamav2/model.py

@@ -2,6 +2,7 @@
 
 import gc
 import pathlib
+import threading
 import time
 
 import torch
@@ -623,14 +624,18 @@ class ExllamaV2Container:
 
         return kwargs
 
-    async def generate_gen(self, prompt: str, **kwargs):
+    async def generate_gen(
+        self, prompt: str, abort_event: Optional[threading.Event] = None, **kwargs
+    ):
         """Basic async wrapper for completion generator"""
 
-        sync_generator = self.generate_gen_sync(prompt, **kwargs)
+        sync_generator = self.generate_gen_sync(prompt, abort_event, **kwargs)
         async for value in iterate_in_threadpool(sync_generator):
             yield value
 
-    def generate_gen_sync(self, prompt: str, **kwargs):
+    def generate_gen_sync(
+        self, prompt: str, abort_event: Optional[threading.Event] = None, **kwargs
+    ):
         """
         Create generator function for prompt completion.
 
@@ -893,6 +898,7 @@ class ExllamaV2Container:
                         return_probabilities=request_logprobs > 0,
                         return_top_tokens=request_logprobs,
                         return_logits=request_logprobs > 0,
+                        abort_event=abort_event,
                     )
                 else:
                     self.generator.begin_stream_ex(
@@ -903,6 +909,7 @@ class ExllamaV2Container:
                         return_probabilities=request_logprobs > 0,
                         return_top_tokens=request_logprobs,
                         return_logits=request_logprobs > 0,
+                        abort_event=abort_event,
                     )
 
                 # Reset offsets for subsequent passes if the context is truncated

endpoints/OAI/utils/chat_completion.py

@@ -2,6 +2,7 @@
 
 from asyncio import CancelledError
 import pathlib
+import threading
 from typing import Optional
 from uuid import uuid4
 
@@ -161,8 +162,11 @@ async def stream_generate_chat_completion(
     """Generator for the generation process."""
     try:
         const_id = f"chatcmpl-{uuid4().hex}"
+        abort_event = threading.Event()
 
-        new_generation = model.container.generate_gen(prompt, **data.to_gen_params())
+        new_generation = model.container.generate_gen(
+            prompt, abort_event, **data.to_gen_params()
+        )
         async for generation in new_generation:
             response = _create_stream_chunk(const_id, generation, model_path.name)
 
@@ -174,6 +178,7 @@ async def stream_generate_chat_completion(
     except CancelledError:
         # Get out if the request gets disconnected
 
+        abort_event.set()
         handle_request_disconnect("Chat completion generation cancelled by user.")
     except Exception:
         yield get_generator_error(

endpoints/OAI/utils/completion.py

@@ -2,6 +2,7 @@
 
 import pathlib
 from asyncio import CancelledError
+import threading
 from fastapi import HTTPException
 from typing import Optional
 
@@ -64,8 +65,10 @@ async def stream_generate_completion(data: CompletionRequest, model_path: pathli
     """Streaming generation for completions."""
 
     try:
+        abort_event = threading.Event()
+
         new_generation = model.container.generate_gen(
-            data.prompt, **data.to_gen_params()
+            data.prompt, abort_event, **data.to_gen_params()
         )
         async for generation in new_generation:
             response = _create_response(generation, model_path.name)
@@ -78,6 +81,7 @@ async def stream_generate_completion(data: CompletionRequest, model_path: pathli
     except CancelledError:
         # Get out if the request gets disconnected
 
+        abort_event.set()
         handle_request_disconnect("Completion generation cancelled by user.")
     except Exception:
         yield get_generator_error(