Fix codegate version and similar commands.

While refactoring I removed three lines of coding managing
short-circuited requests. We short-circuit requests to implement
`codegate version`, `codegate workspace`, and similar commands.

Given we now have a provider-native representation of the messages, it
is necessary to produce the right message for the given request and
provider, so some code must be added in provider-specific modules to
handle that.

Fixes #1362

Author: blkt

src/codegate/providers/anthropic/provider.py

@@ -77,6 +77,7 @@ async def process_request(
         client_type: ClientType,
         completion_handler: Callable | None = None,
         stream_generator: Callable | None = None,
+        short_circuiter: Callable | None = None,
     ):
         try:
             stream = await self.complete(
@@ -86,6 +87,7 @@ async def process_request(
                 is_fim_request,
                 client_type,
                 completion_handler=completion_handler,
+                short_circuiter=short_circuiter,
             )
         except Exception as e:
             # check if we have an status code there

src/codegate/providers/base.py

@@ -259,6 +259,7 @@ async def complete(
         is_fim_request: bool,
         client_type: ClientType,
         completion_handler: Callable | None = None,
+        short_circuiter: Callable | None = None,
     ) -> Union[Any, AsyncIterator[Any]]:
         """
         Main completion flow with pipeline integration
@@ -287,6 +288,10 @@ async def complete(
             is_fim_request,
         )
 
+        if input_pipeline_result.response and input_pipeline_result.context:
+            if short_circuiter:  # this if should be removed eventually
+                return short_circuiter(input_pipeline_result)
+
         provider_request = normalized_request  # default value
         if input_pipeline_result.request:
             provider_request = self._input_normalizer.denormalize(input_pipeline_result.request)

src/codegate/providers/openai/provider.py

@@ -14,6 +14,7 @@
 from codegate.types.openai import (
     ChatCompletionRequest,
     completions_streaming,
+    short_circuiter,
     stream_generator,
 )
 
@@ -72,6 +73,7 @@ async def process_request(
         client_type: ClientType,
         completion_handler: Callable | None = None,
         stream_generator: Callable | None = None,
+        short_circuiter: Callable | None = None,
     ):
         try:
             stream = await self.complete(
@@ -81,6 +83,7 @@ async def process_request(
                 is_fim_request=is_fim_request,
                 client_type=client_type,
                 completion_handler=completion_handler,
+                short_circuiter=short_circuiter,
             )
         except Exception as e:
             # Check if we have an status code there
@@ -130,4 +133,5 @@ async def create_completion(
                 self.base_url,
                 is_fim_request,
                 request.state.detected_client,
+                short_circuiter=short_circuiter,
             )

src/codegate/types/openai/__init__.py

@@ -2,6 +2,7 @@
 from ._generators import (
     completions_streaming,
     message_wrapper,
+    short_circuiter,
     single_response_generator,
     stream_generator,
     streaming,
@@ -74,6 +75,7 @@
     "completions_streaming",
     "message_wrapper",
     "single_response_generator",
+    "short_circuiter",
     "stream_generator",
     "streaming",
     "LegacyCompletion",

src/codegate/types/openai/_generators.py

@@ -1,5 +1,7 @@
 import os
+import time
 from typing import (
+    Any,
     AsyncIterator,
 )
 
@@ -9,9 +11,16 @@
 from ._legacy_models import (
     LegacyCompletionRequest,
 )
+from ._request_models import (
+    ChatCompletionRequest,
+)
 from ._response_models import (
     ChatCompletion,
+    Choice,
+    ChoiceDelta,
     ErrorDetails,
+    Message,
+    MessageDelta,
     MessageError,
     StreamingChatCompletion,
     VllmMessageError,
@@ -20,6 +29,48 @@
 logger = structlog.get_logger("codegate")
 
 
+async def short_circuiter(pipeline_result) -> AsyncIterator[Any]:
+    # NOTE: This routine MUST be called only when we short-circuit the
+    # request.
+    assert pipeline_result.context.shortcut_response  # nosec
+
+    match pipeline_result.context.input_request.request:
+        case ChatCompletionRequest(stream=True):
+            yield StreamingChatCompletion(
+                id="codegate",
+                model=pipeline_result.response.model,
+                created=int(time.time()),
+                choices=[
+                    ChoiceDelta(
+                        finish_reason="stop",
+                        index=0,
+                        delta=MessageDelta(
+                            content=pipeline_result.response.content,
+                        ),
+                    ),
+                ],
+            )
+        case ChatCompletionRequest(stream=False):
+            yield ChatCompletion(
+                id="codegate",
+                model=pipeline_result.response.model,
+                created=int(time.time()),
+                choices=[
+                    Choice(
+                        finish_reason="stop",
+                        index=0,
+                        message=Message(
+                            content=pipeline_result.response.content,
+                        ),
+                    ),
+                ],
+            )
+        case _:
+            raise ValueError(
+                f"invalid input request: {pipeline_result.context.input_request.request}"
+            )
+
+
 async def stream_generator(stream: AsyncIterator[StreamingChatCompletion]) -> AsyncIterator[str]:
     """OpenAI-style SSE format"""
     try:

src/codegate/updates/client.py

@@ -1,8 +1,8 @@
+import os
 from enum import Enum
 
 import requests
 import structlog
-import os
 
 logger = structlog.get_logger("codegate")