structure saas with tools

.venv/lib/python3.10/site-packages/google/adk/tools/function_tool.py

@@ -0,0 +1,87 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import inspect
+from typing import Any
+from typing import Callable
+from typing import Optional
+
+from google.genai import types
+from typing_extensions import override
+
+from ._automatic_function_calling_util import build_function_declaration
+from .base_tool import BaseTool
+from .tool_context import ToolContext
+
+
+class FunctionTool(BaseTool):
+  """A tool that wraps a user-defined Python function.
+
+  Attributes:
+    func: The function to wrap.
+  """
+
+  def __init__(self, func: Callable[..., Any]):
+    super().__init__(name=func.__name__, description=func.__doc__)
+    self.func = func
+
+  @override
+  def _get_declaration(self) -> Optional[types.FunctionDeclaration]:
+    function_decl = types.FunctionDeclaration.model_validate(
+        build_function_declaration(
+            func=self.func,
+            # The model doesn't understand the function context.
+            # input_stream is for streaming tool
+            ignore_params=['tool_context', 'input_stream'],
+            variant=self._api_variant,
+        )
+    )
+
+    return function_decl
+
+  @override
+  async def run_async(
+      self, *, args: dict[str, Any], tool_context: ToolContext
+  ) -> Any:
+    args_to_call = args.copy()
+    signature = inspect.signature(self.func)
+    if 'tool_context' in signature.parameters:
+      args_to_call['tool_context'] = tool_context
+
+    if inspect.iscoroutinefunction(self.func):
+      return await self.func(**args_to_call) or {}
+    else:
+      return self.func(**args_to_call) or {}
+
+  # TODO(hangfei): fix call live for function stream.
+  async def _call_live(
+      self,
+      *,
+      args: dict[str, Any],
+      tool_context: ToolContext,
+      invocation_context,
+  ) -> Any:
+    args_to_call = args.copy()
+    signature = inspect.signature(self.func)
+    if (
+        self.name in invocation_context.active_streaming_tools
+        and invocation_context.active_streaming_tools[self.name].stream
+    ):
+      args_to_call['input_stream'] = invocation_context.active_streaming_tools[
+          self.name
+      ].stream
+    if 'tool_context' in signature.parameters:
+      args_to_call['tool_context'] = tool_context
+    async for item in self.func(**args_to_call):
+      yield item