Add image preparation APIs (#38)

Also make debug logging for file uploads less noisy.

Implements the remaining components of #34

Author: ncoghlan

src/lmstudio/async_api.py

@@ -87,6 +87,7 @@
     check_model_namespace,
     load_struct,
     _model_spec_to_api_dict,
+    _redact_json,
 )
 from ._kv_config import TLoadConfig, TLoadConfigDict, dict_from_fields_key
 from ._sdk_models import (
@@ -368,7 +369,14 @@ async def _send_call(
         """Initiate remote call to specified endpoint."""
         self._ensure_connected("send remote procedure call")
         call_message = rpc.get_rpc_message(endpoint, params)
-        self._logger.debug("Sending RPC request", json=call_message)
+        # TODO: Improve logging for large requests (such as file uploads)
+        #       without requiring explicit special casing here
+        logged_message: DictObject
+        if call_message.get("endpoint") == "uploadFileBase64":
+            logged_message = _redact_json(call_message)
+        else:
+            logged_message = call_message
+        self._logger.debug("Sending RPC request", json=logged_message)
         await self._send_json(call_message)
 
     async def remote_call(
@@ -593,8 +601,15 @@ async def _fetch_file_handle(self, file_data: _LocalFileData) -> FileHandle:
     async def prepare_file(
         self, src: LocalFileInput, name: str | None = None
     ) -> FileHandle:
-        """Add a file to the server."""
-        # Private until LM Studio file handle support stabilizes
+        """Add a file to the server. Returns a file handle for use in prediction requests."""
+        file_data = _LocalFileData(src, name)
+        return await self._fetch_file_handle(file_data)
+
+    @sdk_public_api_async()
+    async def prepare_image(
+        self, src: LocalFileInput, name: str | None = None
+    ) -> FileHandle:
+        """Add an image to the server. Returns a file handle for use in prediction requests."""
         file_data = _LocalFileData(src, name)
         return await self._fetch_file_handle(file_data)
 
@@ -672,7 +687,7 @@ def _system_session(self) -> AsyncSessionSystem:
 
     @property
     def _files_session(self) -> _AsyncSessionFiles:
-        return self._client._files
+        return self._client.files
 
     async def _get_load_config(self, model_specifier: AnyModelSpecifier) -> DictObject:
         """Get the model load config for the specified model."""
@@ -1490,9 +1505,8 @@ def system(self) -> AsyncSessionSystem:
         return self._get_session(AsyncSessionSystem)
 
     @property
-    def _files(self) -> _AsyncSessionFiles:
+    def files(self) -> _AsyncSessionFiles:
         """Return the files API client session."""
-        # Private until LM Studio file handle support stabilizes
         return self._get_session(_AsyncSessionFiles)
 
     @property
@@ -1505,9 +1519,15 @@ def repository(self) -> AsyncSessionRepository:
     async def prepare_file(
         self, src: LocalFileInput, name: str | None = None
     ) -> FileHandle:
-        """Add a file to the server."""
-        # Private until LM Studio file handle support stabilizes
-        return await self._files.prepare_file(src, name)
+        """Add a file to the server. Returns a file handle for use in prediction requests."""
+        return await self.files.prepare_file(src, name)
+
+    @sdk_public_api_async()
+    async def prepare_image(
+        self, src: LocalFileInput, name: str | None = None
+    ) -> FileHandle:
+        """Add an image to the server. Returns a file handle for use in prediction requests."""
+        return await self.files.prepare_image(src, name)
 
     @sdk_public_api_async()
     async def list_downloaded_models(

src/lmstudio/history.py

@@ -52,7 +52,7 @@
     ChatMessagePartToolCallResultData as ToolCallResultData,
     ChatMessagePartToolCallResultDataDict as ToolCallResultDataDict,
     FilesRpcUploadFileBase64Parameter,
-    FileType as FileHandleType,
+    FileType,
     ToolCallRequest as ToolCallRequest,
     FunctionToolCallRequestDict as ToolCallRequestDict,
 )
@@ -70,7 +70,7 @@
     "FileHandle",
     "FileHandleDict",
     "FileHandleInput",
-    "FileHandleType",
+    "FileType",
     "SystemPrompt",
     "SystemPromptContent",
     "ToolCallRequest",

src/lmstudio/json_api.py

@@ -26,6 +26,7 @@
     assert_never,
     cast,
     get_type_hints,
+    overload,
 )
 
 
@@ -490,6 +491,10 @@ class ActResult:
     # fmt: on
 
 
+@overload
+def _redact_json(data: DictObject) -> DictObject: ...
+@overload
+def _redact_json(data: None) -> None: ...
 def _redact_json(data: DictObject | None) -> DictObject | None:
     """Show top level structure without any substructure details."""
     if data is None:

src/lmstudio/sync_api.py

@@ -112,6 +112,7 @@
     check_model_namespace,
     load_struct,
     _model_spec_to_api_dict,
+    _redact_json,
 )
 from ._kv_config import TLoadConfig, TLoadConfigDict, dict_from_fields_key
 from ._sdk_models import (
@@ -548,7 +549,14 @@ def _send_call(
         """Initiate remote call to specified endpoint."""
         self._ensure_connected("send remote procedure call")
         call_message = rpc.get_rpc_message(endpoint, params)
-        self._logger.debug("Sending RPC request", json=call_message)
+        # TODO: Improve logging for large requests (such as file uploads)
+        #       without requiring explicit special casing here
+        logged_message: DictObject
+        if call_message.get("endpoint") == "uploadFileBase64":
+            logged_message = _redact_json(call_message)
+        else:
+            logged_message = call_message
+        self._logger.debug("Sending RPC request", json=logged_message)
         self._send_json(call_message)
 
     def remote_call(
@@ -766,8 +774,13 @@ def _fetch_file_handle(self, file_data: _LocalFileData) -> FileHandle:
 
     @sdk_public_api()
     def prepare_file(self, src: LocalFileInput, name: str | None = None) -> FileHandle:
-        """Add a file to the server."""
-        # Private until LM Studio file handle support stabilizes
+        """Add a file to the server. Returns a file handle for use in prediction requests."""
+        file_data = _LocalFileData(src, name)
+        return self._fetch_file_handle(file_data)
+
+    @sdk_public_api()
+    def prepare_image(self, src: LocalFileInput, name: str | None = None) -> FileHandle:
+        """Add an image to the server. Returns a file handle for use in prediction requests."""
         file_data = _LocalFileData(src, name)
         return self._fetch_file_handle(file_data)
 
@@ -838,7 +851,7 @@ def _system_session(self) -> SyncSessionSystem:
 
     @property
     def _files_session(self) -> _SyncSessionFiles:
-        return self._client._files
+        return self._client.files
 
     def _get_load_config(self, model_specifier: AnyModelSpecifier) -> DictObject:
         """Get the model load config for the specified model."""
@@ -1806,9 +1819,8 @@ def system(self) -> SyncSessionSystem:
         return self._get_session(SyncSessionSystem)
 
     @property
-    def _files(self) -> _SyncSessionFiles:
+    def files(self) -> _SyncSessionFiles:
         """Return the files API client session."""
-        # Private until LM Studio file handle support stabilizes
         return self._get_session(_SyncSessionFiles)
 
     @property
@@ -1819,9 +1831,13 @@ def repository(self) -> SyncSessionRepository:
     # Convenience methods
     @sdk_public_api()
     def prepare_file(self, src: LocalFileInput, name: str | None = None) -> FileHandle:
-        """Add a file to the server."""
-        # Private until LM Studio file handle support stabilizes
-        return self._files.prepare_file(src, name)
+        """Add a file to the server. Returns a file handle for use in prediction requests."""
+        return self.files.prepare_file(src, name)
+
+    @sdk_public_api()
+    def prepare_image(self, src: LocalFileInput, name: str | None = None) -> FileHandle:
+        """Add an image to the server. Returns a file handle for use in prediction requests."""
+        return self.files.prepare_image(src, name)
 
     @sdk_public_api()
     def list_downloaded_models(
@@ -1893,10 +1909,15 @@ def embedding_model(
 @sdk_public_api()
 def prepare_file(src: LocalFileInput, name: str | None = None) -> FileHandle:
     """Add a file to the server using the default global client."""
-    # Private until LM Studio file handle support stabilizes
     return get_default_client().prepare_file(src, name)
 
 
+@sdk_public_api()
+def prepare_image(src: LocalFileInput, name: str | None = None) -> FileHandle:
+    """Add an image to the server using the default global client."""
+    return get_default_client().prepare_image(src, name)
+
+
 @sdk_public_api()
 def list_downloaded_models(
     namespace: str | None = None,

tests/async/test_images_async.py

@@ -23,37 +23,55 @@
 async def test_upload_from_pathlike_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     async with AsyncClient() as client:
-        session = client._files
+        session = client.files
         file = await session.prepare_file(IMAGE_FILEPATH)
         assert file
         assert isinstance(file, FileHandle)
         logging.info(f"Uploaded file: {file}")
+        image = await session.prepare_image(IMAGE_FILEPATH)
+        assert image
+        assert isinstance(image, FileHandle)
+        logging.info(f"Uploaded image: {image}")
+        # Even with the same data uploaded, assigned identifiers should differ
+        assert image != file
 
 
 @pytest.mark.asyncio
 @pytest.mark.lmstudio
 async def test_upload_from_file_obj_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     async with AsyncClient() as client:
-        session = client._files
+        session = client.files
         with open(IMAGE_FILEPATH, "rb") as f:
             file = await session.prepare_file(f)
         assert file
         assert isinstance(file, FileHandle)
         logging.info(f"Uploaded file: {file}")
+        with open(IMAGE_FILEPATH, "rb") as f:
+            image = await session.prepare_image(f)
+        assert image
+        assert isinstance(image, FileHandle)
+        logging.info(f"Uploaded image: {image}")
+        # Even with the same data uploaded, assigned identifiers should differ
+        assert image != file
 
 
 @pytest.mark.asyncio
 @pytest.mark.lmstudio
 async def test_upload_from_bytesio_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     async with AsyncClient() as client:
-        session = client._files
-        with open(IMAGE_FILEPATH, "rb") as f:
-            file = await session.prepare_file(BytesIO(f.read()))
+        session = client.files
+        file = await session.prepare_file(BytesIO(IMAGE_FILEPATH.read_bytes()))
         assert file
         assert isinstance(file, FileHandle)
         logging.info(f"Uploaded file: {file}")
+        image = await session.prepare_image(BytesIO(IMAGE_FILEPATH.read_bytes()))
+        assert image
+        assert isinstance(image, FileHandle)
+        logging.info(f"Uploaded image: {image}")
+        # Even with the same data uploaded, assigned identifiers should differ
+        assert image != file
 
 
 @pytest.mark.asyncio
@@ -64,9 +82,9 @@ async def test_vlm_predict_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     model_id = EXPECTED_VLM_ID
     async with AsyncClient() as client:
-        file_handle = await client._files.prepare_file(IMAGE_FILEPATH)
+        image_handle = await client.files.prepare_image(IMAGE_FILEPATH)
         history = Chat()
-        history.add_user_message((prompt, file_handle))
+        history.add_user_message((prompt, image_handle))
         vlm = await client.llm.model(model_id)
         response = await vlm.respond(history, config=SHORT_PREDICTION_CONFIG)
     logging.info(f"VLM response: {response!r}")
@@ -84,9 +102,9 @@ async def test_non_vlm_predict_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     model_id = "hugging-quants/llama-3.2-1b-instruct"
     async with AsyncClient() as client:
-        file_handle = await client._files.prepare_file(IMAGE_FILEPATH)
+        image_handle = await client.files.prepare_image(IMAGE_FILEPATH)
         history = Chat()
-        history.add_user_message((prompt, file_handle))
+        history.add_user_message((prompt, image_handle))
         llm = await client.llm.model(model_id)
         with pytest.raises(LMStudioServerError) as exc_info:
             await llm.respond(history)
@@ -101,9 +119,9 @@ async def test_vlm_predict_image_param_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     model_id = EXPECTED_VLM_ID
     async with AsyncClient() as client:
-        file_handle = await client._files.prepare_file(IMAGE_FILEPATH)
+        image_handle = await client.files.prepare_image(IMAGE_FILEPATH)
         history = Chat()
-        history.add_user_message(prompt, images=[file_handle])
+        history.add_user_message(prompt, images=[image_handle])
         vlm = await client.llm.model(model_id)
         response = await vlm.respond(history, config=SHORT_PREDICTION_CONFIG)
     logging.info(f"VLM response: {response!r}")
@@ -121,9 +139,9 @@ async def test_non_vlm_predict_image_param_async(caplog: LogCap) -> None:
     caplog.set_level(logging.DEBUG)
     model_id = "hugging-quants/llama-3.2-1b-instruct"
     async with AsyncClient() as client:
-        file_handle = await client._files.prepare_file(IMAGE_FILEPATH)
+        image_handle = await client.files.prepare_image(IMAGE_FILEPATH)
         history = Chat()
-        history.add_user_message(prompt, images=[file_handle])
+        history.add_user_message(prompt, images=[image_handle])
         llm = await client.llm.model(model_id)
         with pytest.raises(LMStudioServerError) as exc_info:
             await llm.respond(history)