feat: Add synthetic-data-kit for file_search doc conversion

This adds a `builtin::document_conversion` tool for converting
documents when used with file_search that uses
meta-llama/synthetic-data-kit. I also have another local
implementation that uses Docling, but need to debug some segfault
issues I'm hitting locally with that so pushing this first as a
simpler reference implementation.

Long-term I think we'll want a remote implemention here as well - like
perhaps docling-serve or unstructured.io - but need to look more into
that.

This passes the existing
`tests/verifications/openai_api/test_responses.py` but doesn't yet add
any new tests for file types besides text and pdf.

Signed-off-by: Ben Browning <bbrownin@redhat.com>

llama_stack/providers/inline/tool_runtime/synthetic-data-kit/__init__.py

@@ -0,0 +1,19 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from typing import Any
+
+from llama_stack.providers.datatypes import Api
+
+from .config import SyntheticDataKitToolRuntimeConfig
+
+
+async def get_provider_impl(config: SyntheticDataKitToolRuntimeConfig, deps: dict[Api, Any]):
+    from .synthetic_data_kit import SyntheticDataKitToolRuntimeImpl
+
+    impl = SyntheticDataKitToolRuntimeImpl(config, deps[Api.files])
+    await impl.initialize()
+    return impl

llama_stack/providers/inline/tool_runtime/synthetic-data-kit/config.py

@@ -0,0 +1,15 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from typing import Any
+
+from pydantic import BaseModel
+
+
+class SyntheticDataKitToolRuntimeConfig(BaseModel):
+    @classmethod
+    def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> dict[str, Any]:
+        return {}

llama_stack/providers/inline/tool_runtime/synthetic-data-kit/synthetic_data_kit.py

@@ -0,0 +1,117 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+
+import asyncio
+import logging
+import mimetypes
+import os
+import tempfile
+from typing import Any
+
+from llama_stack.apis.common.content_types import URL
+from llama_stack.apis.files.files import Files
+from llama_stack.apis.tools import (
+    ListToolDefsResponse,
+    ToolDef,
+    ToolGroup,
+    ToolInvocationResult,
+    ToolParameter,
+    ToolRuntime,
+)
+from llama_stack.providers.datatypes import ToolGroupsProtocolPrivate
+from llama_stack.providers.utils.memory.vector_store import content_from_data_and_mime_type
+
+from .config import SyntheticDataKitToolRuntimeConfig
+
+log = logging.getLogger(__name__)
+
+
+class SyntheticDataKitToolRuntimeImpl(ToolGroupsProtocolPrivate, ToolRuntime):
+    def __init__(
+        self,
+        config: SyntheticDataKitToolRuntimeConfig,
+        files_api: Files,
+    ):
+        self.config = config
+        self.files_api = files_api
+
+    async def initialize(self):
+        pass
+
+    async def shutdown(self):
+        pass
+
+    async def register_toolgroup(self, toolgroup: ToolGroup) -> None:
+        pass
+
+    async def unregister_toolgroup(self, toolgroup_id: str) -> None:
+        return
+
+    async def list_runtime_tools(
+        self, tool_group_id: str | None = None, mcp_endpoint: URL | None = None
+    ) -> ListToolDefsResponse:
+        return ListToolDefsResponse(
+            data=[
+                ToolDef(
+                    name="convert_file_to_text",
+                    description="Convert a file to text",
+                    parameters=[
+                        ToolParameter(
+                            name="file_id",
+                            description="The id of the file to convert.",
+                            parameter_type="string",
+                        ),
+                    ],
+                ),
+            ]
+        )
+
+    async def invoke_tool(self, tool_name: str, kwargs: dict[str, Any]) -> ToolInvocationResult:
+        if tool_name != "convert_file_to_text":
+            raise ValueError(f"Unknown tool: {tool_name}")
+
+        file_id = kwargs["file_id"]
+        file_response = await self.files_api.openai_retrieve_file(file_id)
+        mime_type, _ = mimetypes.guess_type(file_response.filename)
+        content_response = await self.files_api.openai_retrieve_file_content(file_id)
+
+        mime_category = mime_type.split("/")[0] if mime_type else None
+        if mime_category == "text":
+            # Don't use synthetic-data-kit if the file is already text
+            content = content_from_data_and_mime_type(content_response.body, mime_type)
+            return ToolInvocationResult(
+                content=content,
+                metadata={},
+            )
+        else:
+            return await asyncio.to_thread(
+                self.synthetic_data_kit_convert, content_response.body, file_response.filename
+            )
+
+    def synthetic_data_kit_convert(self, content_body: bytes, filename: str) -> ToolInvocationResult:
+        from synthetic_data_kit.core.ingest import process_file
+
+        try:
+            with tempfile.TemporaryDirectory() as tmpdir:
+                file_path = os.path.join(tmpdir, filename)
+                with open(file_path, "wb") as f:
+                    f.write(content_body)
+                output_path = process_file(file_path, tmpdir)
+                with open(output_path) as f:
+                    content = f.read()
+
+                    return ToolInvocationResult(
+                        content=content,
+                        metadata={},
+                    )
+        except Exception as e:
+            return ToolInvocationResult(
+                content="",
+                error_message=f"Error converting file: {e}",
+                error_code=1,
+                metadata={},
+            )