feat: add customized bigquer tool wrapper class to facilitate developer to handcraft bigquery api tool

PiperOrigin-RevId: 762626700

src/google/adk/tools/bigquery/__init__.py

@@ -0,0 +1,28 @@
+# 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.
+
+"""BigQuery Tools. (Experimental)
+
+BigQuery Tools under this module are hand crafted and customized while the tools
+under google.adk.tools.google_api_tool are auto generated based on API
+definition. The rationales to have customized tool are:
+
+1. BigQuery APIs have functions overlaps and LLM can't tell what tool to use
+2. BigQuery APIs have a lot of parameters with some rarely used, which are not
+ LLM-friendly
+3. We want to provide more high-level tools like forecasting, RAG, segmentation,
+ etc.
+4. We want to provide extra access guardrails in those tools. For example,
+ execute_sql can't arbitrarily mutate existing data.
+"""

src/google/adk/tools/bigquery/bigquery_credentials.py

@@ -0,0 +1,185 @@
+# 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.
+
+from typing import List
+from typing import Optional
+
+from fastapi.openapi.models import OAuth2
+from fastapi.openapi.models import OAuthFlowAuthorizationCode
+from fastapi.openapi.models import OAuthFlows
+from google.auth.exceptions import RefreshError
+from google.auth.transport.requests import Request
+from google.oauth2.credentials import Credentials
+from pydantic import BaseModel
+from pydantic import model_validator
+
+from ...auth import AuthConfig
+from ...auth import AuthCredential
+from ...auth import AuthCredentialTypes
+from ...auth import OAuth2Auth
+from ..tool_context import ToolContext
+
+BIGQUERY_TOKEN_CACHE_KEY = "bigquery_token_cache"
+
+
+class BigQueryCredentials(BaseModel):
+  """Configuration for Google API tools. (Experimental)"""
+
+  # Configure the model to allow arbitrary types like Credentials
+  model_config = {"arbitrary_types_allowed": True}
+
+  credentials: Optional[Credentials] = None
+  """the existing oauth credentials to use. If set will override client ID,
+  client secret, and scopes."""
+  client_id: Optional[str] = None
+  """the oauth client ID to use."""
+  client_secret: Optional[str] = None
+  """the oauth client secret to use."""
+  scopes: Optional[List[str]] = None
+  """the scopes to use.
+  """
+
+  @model_validator(mode="after")
+  def __post_init__(self) -> "BigQueryCredentials":
+    """Validate that either credentials or client ID/secret are provided."""
+    if not self.credentials and (not self.client_id or not self.client_secret):
+      raise ValueError(
+          "Must provide either credentials or client_id abd client_secret pair."
+      )
+    if self.credentials:
+      self.client_id = self.credentials.client_id
+      self.client_secret = self.credentials.client_secret
+      self.scopes = self.credentials.scopes
+    return self
+
+
+class BigQueryCredentialsManager:
+  """Manages Google API credentials with automatic refresh and OAuth flow handling.
+
+  This class centralizes credential management so multiple tools can share
+  the same authenticated session without duplicating OAuth logic.
+  """
+
+  def __init__(self, credentials: BigQueryCredentials):
+    """Initialize the credential manager.
+
+    Args:
+        credential_config: Configuration containing OAuth details or existing
+          credentials
+    """
+    self.credentials = credentials
+
+  async def get_valid_credentials(
+      self, tool_context: ToolContext
+  ) -> Optional[Credentials]:
+    """Get valid credentials, handling refresh and OAuth flow as needed.
+
+    Args:
+        tool_context: The tool context for OAuth flow and state management
+        required_scopes: Set of OAuth scopes required by the calling tool
+
+    Returns:
+        Valid Credentials object, or None if OAuth flow is needed
+    """
+    # First, try to get cached credentials from the instance
+    creds = self.credentials.credentials
+
+    # If credentails are empty
+    if not creds:
+      creds = tool_context.get(BIGQUERY_TOKEN_CACHE_KEY, None)
+      self.credentials.credentials = creds
+
+    # Check if we have valid credentials
+    if creds and creds.valid:
+      return creds
+
+    # Try to refresh expired credentials
+    if creds and creds.expired and creds.refresh_token:
+      try:
+        creds.refresh(Request())
+        if creds.valid:
+          # Cache the refreshed credentials
+          self.credentials.credentials = creds
+          return creds
+      except RefreshError:
+        # Refresh failed, need to re-authenticate
+        pass
+
+    # Need to perform OAuth flow
+    return await self._perform_oauth_flow(tool_context)
+
+  async def _perform_oauth_flow(
+      self, tool_context: ToolContext
+  ) -> Optional[Credentials]:
+    """Perform OAuth flow to get new credentials.
+
+    Args:
+        tool_context: The tool context for OAuth flow
+        required_scopes: Set of required OAuth scopes
+
+    Returns:
+        New Credentials object, or None if flow is in progress
+    """
+
+    # Create OAuth configuration
+    auth_scheme = OAuth2(
+        flows=OAuthFlows(
+            authorizationCode=OAuthFlowAuthorizationCode(
+                authorizationUrl="https://accounts.google.com/o/oauth2/auth",
+                tokenUrl="https://oauth2.googleapis.com/token",
+                scopes={
+                    scope: f"Access to {scope}"
+                    for scope in self.credentials.scopes
+                },
+            )
+        )
+    )
+
+    auth_credential = AuthCredential(
+        auth_type=AuthCredentialTypes.OAUTH2,
+        oauth2=OAuth2Auth(
+            client_id=self.credentials.client_id,
+            client_secret=self.credentials.client_secret,
+        ),
+    )
+
+    # Check if OAuth response is available
+    auth_response = tool_context.get_auth_response(
+        AuthConfig(auth_scheme=auth_scheme, raw_auth_credential=auth_credential)
+    )
+
+    if auth_response:
+      # OAuth flow completed, create credentials
+      creds = Credentials(
+          token=auth_response.oauth2.access_token,
+          refresh_token=auth_response.oauth2.refresh_token,
+          token_uri=auth_scheme.flows.authorizationCode.tokenUrl,
+          client_id=self.credentials.client_id,
+          client_secret=self.credentials.client_secret,
+          scopes=list(self.credentials.scopes),
+      )
+
+      # Cache the new credentials
+      self.credentials.credentials = creds
+      tool_context.state[BIGQUERY_TOKEN_CACHE_KEY] = creds
+      return creds
+    else:
+      # Request OAuth flow
+      tool_context.request_credential(
+          AuthConfig(
+              auth_scheme=auth_scheme,
+              raw_auth_credential=auth_credential,
+          )
+      )
+      return None

src/google/adk/tools/bigquery/bigquery_tool.py

@@ -0,0 +1,116 @@
+# 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 typing import override
+
+from google.oauth2.credentials import Credentials
+
+from ..function_tool import FunctionTool
+from ..tool_context import ToolContext
+from .bigquery_credentials import BigQueryCredentials
+from .bigquery_credentials import BigQueryCredentialsManager
+
+
+class BigQueryTool(FunctionTool):
+  """GoogleApiTool class for tools that call Google APIs.
+
+  This class is for developers to handcraft customized Google API tools rather
+  than auto generate Google API tools based on API specs.
+
+  This class handles all the OAuth complexity, credential management,
+  and common Google API patterns so subclasses can focus on their
+  specific functionality.
+  """
+
+  def __init__(
+      self,
+      func: Callable[..., Any],
+      credentials: Optional[BigQueryCredentials] = None,
+  ):
+    """Initialize the Google API tool.
+
+    Args:
+        func: callable that impelments the tool's logic, can accept one
+          'credential" parameter
+        credentials: credentials used to call Google API. If None, then we don't
+          hanlde the auth logic
+    """
+    super().__init__(func=func)
+    self._ignore_params.append("credentials")
+    self.credentials_manager = (
+        BigQueryCredentialsManager(credentials) if credentials else None
+    )
+
+  @override
+  async def run_async(
+      self, *, args: dict[str, Any], tool_context: ToolContext
+  ) -> Any:
+    """Main entry point for tool execution with credential handling.
+
+    This method handles all the OAuth complexity and then delegates
+    to the subclass's run_async_with_credential method.
+    """
+    try:
+      # Get valid credentials
+      credentials = (
+          await self.credentials_manager.get_valid_credentials(tool_context)
+          if self.credentials_manager
+          else None
+      )
+
+      if credentials is None and self.credentials_manager:
+        # OAuth flow in progress
+        return (
+            "User authorization is required to access Google services for"
+            f" {self.name}. Please complete the authorization flow."
+        )
+
+      # Execute the tool's specific logic with valid credentials
+
+      return await self._run_async_with_credential(
+          credentials, args, tool_context
+      )
+
+    except Exception as ex:
+      return {
+          "status": "ERROR",
+          "error_details": str(ex),
+      }
+
+  async def _run_async_with_credential(
+      self,
+      credentials: Credentials,
+      args: dict[str, Any],
+      tool_context: ToolContext,
+  ) -> Any:
+    """Execute the tool's specific logic with valid credentials.
+
+    Args:
+        credentials: Valid Google OAuth credentials
+        args: Arguments passed to the tool
+        tool_context: Tool execution context
+
+    Returns:
+        The result of the tool execution
+    """
+    args_to_call = args.copy()
+    signature = inspect.signature(self.func)
+    if "credentials" in signature.parameters:
+      args_to_call["credentials"] = credentials
+    return await super().run_async(args=args_to_call, tool_context=tool_context)

src/google/adk/tools/function_tool.py

@@ -57,6 +57,7 @@ class FunctionTool(BaseTool):
 
     super().__init__(name=name, description=doc)
     self.func = func
+    self._ignore_params = ['tool_context', 'input_stream']
 
   @override
   def _get_declaration(self) -> Optional[types.FunctionDeclaration]:
@@ -65,7 +66,7 @@ class FunctionTool(BaseTool):
             func=self.func,
             # The model doesn't understand the function context.
             # input_stream is for streaming tool
-            ignore_params=['tool_context', 'input_stream'],
+            ignore_params=self._ignore_params,
             variant=self._api_variant,
         )
     )