800 lines
28 KiB
Python
800 lines
28 KiB
Python
import inspect
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import logging
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import re
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import inspect
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import aiohttp
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import asyncio
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import yaml
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import json
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from pydantic import BaseModel
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from pydantic.fields import FieldInfo
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from typing import (
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Any,
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Awaitable,
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Callable,
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get_type_hints,
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get_args,
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get_origin,
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Dict,
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List,
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Tuple,
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Union,
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Optional,
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Type,
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)
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from functools import update_wrapper, partial
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from fastapi import Request
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from pydantic import BaseModel, Field, create_model
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from langchain_core.utils.function_calling import (
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convert_to_openai_function as convert_pydantic_model_to_openai_function_spec,
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)
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from open_webui.models.tools import Tools
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from open_webui.models.users import UserModel
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from open_webui.utils.plugin import load_tool_module_by_id
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from open_webui.env import (
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SRC_LOG_LEVELS,
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AIOHTTP_CLIENT_TIMEOUT,
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AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER_DATA,
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AIOHTTP_CLIENT_SESSION_TOOL_SERVER_SSL,
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)
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import copy
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log = logging.getLogger(__name__)
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log.setLevel(SRC_LOG_LEVELS["MODELS"])
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def get_async_tool_function_and_apply_extra_params(
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function: Callable, extra_params: dict
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) -> Callable[..., Awaitable]:
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sig = inspect.signature(function)
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extra_params = {k: v for k, v in extra_params.items() if k in sig.parameters}
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partial_func = partial(function, **extra_params)
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# Remove the 'frozen' keyword arguments from the signature
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# python-genai uses the signature to infer the tool properties for native function calling
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parameters = []
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for name, parameter in sig.parameters.items():
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# Exclude keyword arguments that are frozen
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if name in extra_params:
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continue
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# Keep remaining parameters
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parameters.append(parameter)
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new_sig = inspect.Signature(
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parameters=parameters, return_annotation=sig.return_annotation
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)
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if inspect.iscoroutinefunction(function):
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# wrap the functools.partial as python-genai has trouble with it
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# https://github.com/googleapis/python-genai/issues/907
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async def new_function(*args, **kwargs):
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return await partial_func(*args, **kwargs)
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else:
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# Make it a coroutine function when it is not already
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async def new_function(*args, **kwargs):
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return partial_func(*args, **kwargs)
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update_wrapper(new_function, function)
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new_function.__signature__ = new_sig
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return new_function
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async def get_tools(
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request: Request, tool_ids: list[str], user: UserModel, extra_params: dict
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) -> dict[str, dict]:
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tools_dict = {}
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for tool_id in tool_ids:
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tool = Tools.get_tool_by_id(tool_id)
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if tool is None:
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if tool_id.startswith("server:"):
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splits = tool_id.split(":")
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if len(splits) == 2:
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type = "openapi"
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server_id = splits[1]
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elif len(splits) == 3:
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type = splits[1]
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server_id = splits[2]
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server_id_splits = server_id.split("|")
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if len(server_id_splits) == 2:
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server_id = server_id_splits[0]
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function_names = server_id_splits[1].split(",")
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if type == "openapi":
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tool_server_data = None
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for server in await get_tool_servers(request):
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if server["id"] == server_id:
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tool_server_data = server
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break
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if tool_server_data is None:
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log.warning(f"Tool server data not found for {server_id}")
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continue
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tool_server_idx = tool_server_data.get("idx", 0)
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tool_server_connection = (
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request.app.state.config.TOOL_SERVER_CONNECTIONS[
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tool_server_idx
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]
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)
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specs = tool_server_data.get("specs", [])
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for spec in specs:
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function_name = spec["name"]
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auth_type = tool_server_connection.get("auth_type", "bearer")
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cookies = {}
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headers = {}
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if auth_type == "bearer":
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headers["Authorization"] = (
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f"Bearer {tool_server_connection.get('key', '')}"
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)
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elif auth_type == "none":
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# No authentication
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pass
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elif auth_type == "session":
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cookies = request.cookies
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headers["Authorization"] = (
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f"Bearer {request.state.token.credentials}"
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)
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elif auth_type == "system_oauth":
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cookies = request.cookies
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oauth_token = extra_params.get("__oauth_token__", None)
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if oauth_token:
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headers["Authorization"] = (
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f"Bearer {oauth_token.get('access_token', '')}"
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)
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headers["Content-Type"] = "application/json"
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def make_tool_function(
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function_name, tool_server_data, headers
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):
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async def tool_function(**kwargs):
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return await execute_tool_server(
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url=tool_server_data["url"],
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headers=headers,
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cookies=cookies,
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name=function_name,
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params=kwargs,
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server_data=tool_server_data,
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)
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return tool_function
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tool_function = make_tool_function(
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function_name, tool_server_data, headers
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)
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callable = get_async_tool_function_and_apply_extra_params(
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tool_function,
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{},
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)
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tool_dict = {
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"tool_id": tool_id,
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"callable": callable,
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"spec": spec,
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# Misc info
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"type": "external",
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}
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# Handle function name collisions
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while function_name in tools_dict:
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log.warning(
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f"Tool {function_name} already exists in another tools!"
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)
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# Prepend server ID to function name
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function_name = f"{server_id}_{function_name}"
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tools_dict[function_name] = tool_dict
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else:
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log.warning(f"Unsupported tool server type: {type}")
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continue
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else:
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continue
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else:
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module = request.app.state.TOOLS.get(tool_id, None)
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if module is None:
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module, _ = load_tool_module_by_id(tool_id)
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request.app.state.TOOLS[tool_id] = module
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extra_params["__id__"] = tool_id
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# Set valves for the tool
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if hasattr(module, "valves") and hasattr(module, "Valves"):
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valves = Tools.get_tool_valves_by_id(tool_id) or {}
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module.valves = module.Valves(**valves)
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if hasattr(module, "UserValves"):
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extra_params["__user__"]["valves"] = module.UserValves( # type: ignore
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**Tools.get_user_valves_by_id_and_user_id(tool_id, user.id)
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)
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for spec in tool.specs:
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# TODO: Fix hack for OpenAI API
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# Some times breaks OpenAI but others don't. Leaving the comment
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for val in spec.get("parameters", {}).get("properties", {}).values():
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if val.get("type") == "str":
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val["type"] = "string"
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# Remove internal reserved parameters (e.g. __id__, __user__)
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spec["parameters"]["properties"] = {
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key: val
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for key, val in spec["parameters"]["properties"].items()
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if not key.startswith("__")
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}
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# convert to function that takes only model params and inserts custom params
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function_name = spec["name"]
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tool_function = getattr(module, function_name)
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callable = get_async_tool_function_and_apply_extra_params(
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tool_function, extra_params
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)
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# TODO: Support Pydantic models as parameters
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if callable.__doc__ and callable.__doc__.strip() != "":
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s = re.split(":(param|return)", callable.__doc__, 1)
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spec["description"] = s[0]
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else:
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spec["description"] = function_name
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tool_dict = {
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"tool_id": tool_id,
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"callable": callable,
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"spec": spec,
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# Misc info
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"metadata": {
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"file_handler": hasattr(module, "file_handler")
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and module.file_handler,
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"citation": hasattr(module, "citation") and module.citation,
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},
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}
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# Handle function name collisions
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while function_name in tools_dict:
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log.warning(
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f"Tool {function_name} already exists in another tools!"
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)
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# Prepend tool ID to function name
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function_name = f"{tool_id}_{function_name}"
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tools_dict[function_name] = tool_dict
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return tools_dict
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def parse_description(docstring: str | None) -> str:
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"""
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Parse a function's docstring to extract the description.
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Args:
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docstring (str): The docstring to parse.
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Returns:
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str: The description.
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"""
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if not docstring:
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return ""
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lines = [line.strip() for line in docstring.strip().split("\n")]
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description_lines: list[str] = []
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for line in lines:
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if re.match(r":param", line) or re.match(r":return", line):
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break
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description_lines.append(line)
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return "\n".join(description_lines)
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def parse_docstring(docstring):
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"""
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Parse a function's docstring to extract parameter descriptions in reST format.
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Args:
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docstring (str): The docstring to parse.
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Returns:
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dict: A dictionary where keys are parameter names and values are descriptions.
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"""
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if not docstring:
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return {}
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# Regex to match `:param name: description` format
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param_pattern = re.compile(r":param (\w+):\s*(.+)")
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param_descriptions = {}
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for line in docstring.splitlines():
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match = param_pattern.match(line.strip())
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if not match:
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continue
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param_name, param_description = match.groups()
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if param_name.startswith("__"):
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continue
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param_descriptions[param_name] = param_description
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return param_descriptions
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def convert_function_to_pydantic_model(func: Callable) -> type[BaseModel]:
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"""
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Converts a Python function's type hints and docstring to a Pydantic model,
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including support for nested types, default values, and descriptions.
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Args:
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func: The function whose type hints and docstring should be converted.
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model_name: The name of the generated Pydantic model.
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Returns:
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A Pydantic model class.
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"""
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type_hints = get_type_hints(func)
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signature = inspect.signature(func)
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parameters = signature.parameters
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docstring = func.__doc__
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function_description = parse_description(docstring)
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function_param_descriptions = parse_docstring(docstring)
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field_defs = {}
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for name, param in parameters.items():
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type_hint = type_hints.get(name, Any)
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default_value = param.default if param.default is not param.empty else ...
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param_description = function_param_descriptions.get(name, None)
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if param_description:
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field_defs[name] = (
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type_hint,
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Field(default_value, description=param_description),
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)
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else:
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field_defs[name] = type_hint, default_value
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model = create_model(func.__name__, **field_defs)
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model.__doc__ = function_description
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return model
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def get_functions_from_tool(tool: object) -> list[Callable]:
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return [
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getattr(tool, func)
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for func in dir(tool)
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if callable(
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getattr(tool, func)
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) # checks if the attribute is callable (a method or function).
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and not func.startswith(
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"__"
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) # filters out special (dunder) methods like init, str, etc. — these are usually built-in functions of an object that you might not need to use directly.
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and not inspect.isclass(
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getattr(tool, func)
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) # ensures that the callable is not a class itself, just a method or function.
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]
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def get_tool_specs(tool_module: object) -> list[dict]:
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function_models = map(
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convert_function_to_pydantic_model, get_functions_from_tool(tool_module)
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)
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specs = [
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convert_pydantic_model_to_openai_function_spec(function_model)
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for function_model in function_models
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]
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return specs
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def resolve_schema(schema, components):
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"""
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Recursively resolves a JSON schema using OpenAPI components.
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"""
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if not schema:
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return {}
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if "$ref" in schema:
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ref_path = schema["$ref"]
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ref_parts = ref_path.strip("#/").split("/")
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resolved = components
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for part in ref_parts[1:]: # Skip the initial 'components'
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resolved = resolved.get(part, {})
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return resolve_schema(resolved, components)
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resolved_schema = copy.deepcopy(schema)
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# Recursively resolve inner schemas
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if "properties" in resolved_schema:
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for prop, prop_schema in resolved_schema["properties"].items():
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resolved_schema["properties"][prop] = resolve_schema(
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prop_schema, components
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)
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if "items" in resolved_schema:
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resolved_schema["items"] = resolve_schema(resolved_schema["items"], components)
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return resolved_schema
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def convert_openapi_to_tool_payload(openapi_spec):
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"""
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Converts an OpenAPI specification into a custom tool payload structure.
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Args:
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openapi_spec (dict): The OpenAPI specification as a Python dict.
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Returns:
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list: A list of tool payloads.
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"""
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tool_payload = []
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for path, methods in openapi_spec.get("paths", {}).items():
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for method, operation in methods.items():
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if operation.get("operationId"):
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tool = {
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"name": operation.get("operationId"),
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"description": operation.get(
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"description",
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operation.get("summary", "No description available."),
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),
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"parameters": {"type": "object", "properties": {}, "required": []},
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}
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# Extract path and query parameters
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for param in operation.get("parameters", []):
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param_name = param["name"]
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param_schema = param.get("schema", {})
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description = param_schema.get("description", "")
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if not description:
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description = param.get("description") or ""
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if param_schema.get("enum") and isinstance(
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param_schema.get("enum"), list
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):
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description += (
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f". Possible values: {', '.join(param_schema.get('enum'))}"
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)
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param_property = {
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"type": param_schema.get("type"),
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"description": description,
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}
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# Include items property for array types (required by OpenAI)
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if param_schema.get("type") == "array" and "items" in param_schema:
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param_property["items"] = param_schema["items"]
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tool["parameters"]["properties"][param_name] = param_property
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if param.get("required"):
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tool["parameters"]["required"].append(param_name)
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# Extract and resolve requestBody if available
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request_body = operation.get("requestBody")
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if request_body:
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content = request_body.get("content", {})
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json_schema = content.get("application/json", {}).get("schema")
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if json_schema:
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resolved_schema = resolve_schema(
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json_schema, openapi_spec.get("components", {})
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)
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if resolved_schema.get("properties"):
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tool["parameters"]["properties"].update(
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resolved_schema["properties"]
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)
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if "required" in resolved_schema:
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tool["parameters"]["required"] = list(
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set(
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tool["parameters"]["required"]
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+ resolved_schema["required"]
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)
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)
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elif resolved_schema.get("type") == "array":
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tool["parameters"] = (
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resolved_schema # special case for array
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)
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tool_payload.append(tool)
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return tool_payload
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async def set_tool_servers(request: Request):
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request.app.state.TOOL_SERVERS = await get_tool_servers_data(
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request.app.state.config.TOOL_SERVER_CONNECTIONS
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)
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if request.app.state.redis is not None:
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await request.app.state.redis.set(
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"tool_servers", json.dumps(request.app.state.TOOL_SERVERS)
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)
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return request.app.state.TOOL_SERVERS
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async def get_tool_servers(request: Request):
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tool_servers = []
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if request.app.state.redis is not None:
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try:
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tool_servers = json.loads(await request.app.state.redis.get("tool_servers"))
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request.app.state.TOOL_SERVERS = tool_servers
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except Exception as e:
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log.error(f"Error fetching tool_servers from Redis: {e}")
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if not tool_servers:
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tool_servers = await set_tool_servers(request)
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return tool_servers
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async def get_tool_server_data(token: str, url: str) -> Dict[str, Any]:
|
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headers = {
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"Accept": "application/json",
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"Content-Type": "application/json",
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}
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if token:
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headers["Authorization"] = f"Bearer {token}"
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|
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error = None
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try:
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timeout = aiohttp.ClientTimeout(total=AIOHTTP_CLIENT_TIMEOUT_TOOL_SERVER_DATA)
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|
async with aiohttp.ClientSession(timeout=timeout, trust_env=True) as session:
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async with session.get(
|
|
url, headers=headers, ssl=AIOHTTP_CLIENT_SESSION_TOOL_SERVER_SSL
|
|
) as response:
|
|
if response.status != 200:
|
|
error_body = await response.json()
|
|
raise Exception(error_body)
|
|
|
|
text_content = None
|
|
|
|
# Check if URL ends with .yaml or .yml to determine format
|
|
if url.lower().endswith((".yaml", ".yml")):
|
|
text_content = await response.text()
|
|
res = yaml.safe_load(text_content)
|
|
else:
|
|
text_content = await response.text()
|
|
|
|
try:
|
|
res = json.loads(text_content)
|
|
except json.JSONDecodeError:
|
|
try:
|
|
res = yaml.safe_load(text_content)
|
|
except Exception as e:
|
|
raise e
|
|
|
|
except Exception as err:
|
|
log.exception(f"Could not fetch tool server spec from {url}")
|
|
if isinstance(err, dict) and "detail" in err:
|
|
error = err["detail"]
|
|
else:
|
|
error = str(err)
|
|
raise Exception(error)
|
|
|
|
data = {
|
|
"openapi": res,
|
|
"info": res.get("info", {}),
|
|
"specs": convert_openapi_to_tool_payload(res),
|
|
}
|
|
|
|
log.info(f"Fetched data: {data}")
|
|
return data
|
|
|
|
|
|
async def get_tool_servers_data(servers: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
|
|
# Prepare list of enabled servers along with their original index
|
|
server_entries = []
|
|
for idx, server in enumerate(servers):
|
|
if (
|
|
server.get("config", {}).get("enable")
|
|
and server.get("type", "openapi") == "openapi"
|
|
):
|
|
# Path (to OpenAPI spec URL) can be either a full URL or a path to append to the base URL
|
|
openapi_path = server.get("path", "openapi.json")
|
|
full_url = get_tool_server_url(server.get("url"), openapi_path)
|
|
|
|
info = server.get("info", {})
|
|
|
|
auth_type = server.get("auth_type", "bearer")
|
|
token = None
|
|
|
|
if auth_type == "bearer":
|
|
token = server.get("key", "")
|
|
elif auth_type == "none":
|
|
# No authentication
|
|
pass
|
|
|
|
id = info.get("id")
|
|
if not id:
|
|
id = str(idx)
|
|
|
|
server_entries.append((id, idx, server, full_url, info, token))
|
|
|
|
# Create async tasks to fetch data
|
|
tasks = [
|
|
get_tool_server_data(token, url) for (_, _, _, url, _, token) in server_entries
|
|
]
|
|
|
|
# Execute tasks concurrently
|
|
responses = await asyncio.gather(*tasks, return_exceptions=True)
|
|
|
|
# Build final results with index and server metadata
|
|
results = []
|
|
for (id, idx, server, url, info, _), response in zip(server_entries, responses):
|
|
if isinstance(response, Exception):
|
|
log.error(f"Failed to connect to {url} OpenAPI tool server")
|
|
continue
|
|
|
|
openapi_data = response.get("openapi", {})
|
|
|
|
if info and isinstance(openapi_data, dict):
|
|
openapi_data["info"] = openapi_data.get("info", {})
|
|
|
|
if "name" in info:
|
|
openapi_data["info"]["title"] = info.get("name", "Tool Server")
|
|
|
|
if "description" in info:
|
|
openapi_data["info"]["description"] = info.get("description", "")
|
|
|
|
results.append(
|
|
{
|
|
"id": str(id),
|
|
"idx": idx,
|
|
"url": server.get("url"),
|
|
"openapi": openapi_data,
|
|
"info": response.get("info"),
|
|
"specs": response.get("specs"),
|
|
}
|
|
)
|
|
|
|
return results
|
|
|
|
|
|
async def execute_tool_server(
|
|
url: str,
|
|
headers: Dict[str, str],
|
|
cookies: Dict[str, str],
|
|
name: str,
|
|
params: Dict[str, Any],
|
|
server_data: Dict[str, Any],
|
|
) -> Tuple[Dict[str, Any], Optional[Dict[str, Any]]]:
|
|
error = None
|
|
try:
|
|
openapi = server_data.get("openapi", {})
|
|
paths = openapi.get("paths", {})
|
|
|
|
matching_route = None
|
|
for route_path, methods in paths.items():
|
|
for http_method, operation in methods.items():
|
|
if isinstance(operation, dict) and operation.get("operationId") == name:
|
|
matching_route = (route_path, methods)
|
|
break
|
|
if matching_route:
|
|
break
|
|
|
|
if not matching_route:
|
|
raise Exception(f"No matching route found for operationId: {name}")
|
|
|
|
route_path, methods = matching_route
|
|
|
|
method_entry = None
|
|
for http_method, operation in methods.items():
|
|
if operation.get("operationId") == name:
|
|
method_entry = (http_method.lower(), operation)
|
|
break
|
|
|
|
if not method_entry:
|
|
raise Exception(f"No matching method found for operationId: {name}")
|
|
|
|
http_method, operation = method_entry
|
|
|
|
path_params = {}
|
|
query_params = {}
|
|
body_params = {}
|
|
|
|
for param in operation.get("parameters", []):
|
|
param_name = param["name"]
|
|
param_in = param["in"]
|
|
if param_name in params:
|
|
if param_in == "path":
|
|
path_params[param_name] = params[param_name]
|
|
elif param_in == "query":
|
|
query_params[param_name] = params[param_name]
|
|
|
|
final_url = f"{url}{route_path}"
|
|
for key, value in path_params.items():
|
|
final_url = final_url.replace(f"{{{key}}}", str(value))
|
|
|
|
if query_params:
|
|
query_string = "&".join(f"{k}={v}" for k, v in query_params.items())
|
|
final_url = f"{final_url}?{query_string}"
|
|
|
|
if operation.get("requestBody", {}).get("content"):
|
|
if params:
|
|
body_params = params
|
|
else:
|
|
raise Exception(
|
|
f"Request body expected for operation '{name}' but none found."
|
|
)
|
|
|
|
async with aiohttp.ClientSession(
|
|
trust_env=True, timeout=aiohttp.ClientTimeout(total=AIOHTTP_CLIENT_TIMEOUT)
|
|
) as session:
|
|
request_method = getattr(session, http_method.lower())
|
|
|
|
if http_method in ["post", "put", "patch"]:
|
|
async with request_method(
|
|
final_url,
|
|
json=body_params,
|
|
headers=headers,
|
|
cookies=cookies,
|
|
ssl=AIOHTTP_CLIENT_SESSION_TOOL_SERVER_SSL,
|
|
allow_redirects=False,
|
|
) as response:
|
|
if response.status >= 400:
|
|
text = await response.text()
|
|
raise Exception(f"HTTP error {response.status}: {text}")
|
|
|
|
try:
|
|
response_data = await response.json()
|
|
except Exception:
|
|
response_data = await response.text()
|
|
|
|
response_headers = response.headers
|
|
return (response_data, response_headers)
|
|
else:
|
|
async with request_method(
|
|
final_url,
|
|
headers=headers,
|
|
cookies=cookies,
|
|
ssl=AIOHTTP_CLIENT_SESSION_TOOL_SERVER_SSL,
|
|
allow_redirects=False,
|
|
) as response:
|
|
if response.status >= 400:
|
|
text = await response.text()
|
|
raise Exception(f"HTTP error {response.status}: {text}")
|
|
|
|
try:
|
|
response_data = await response.json()
|
|
except Exception:
|
|
response_data = await response.text()
|
|
|
|
response_headers = response.headers
|
|
return (response_data, response_headers)
|
|
|
|
except Exception as err:
|
|
error = str(err)
|
|
log.exception(f"API Request Error: {error}")
|
|
return ({"error": error}, None)
|
|
|
|
|
|
def get_tool_server_url(url: Optional[str], path: str) -> str:
|
|
"""
|
|
Build the full URL for a tool server, given a base url and a path.
|
|
"""
|
|
if "://" in path:
|
|
# If it contains "://", it's a full URL
|
|
return path
|
|
if not path.startswith("/"):
|
|
# Ensure the path starts with a slash
|
|
path = f"/{path}"
|
|
return f"{url}{path}"
|