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135 lines
4.8 KiB
Python
135 lines
4.8 KiB
Python
# Copyright 2026 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from google.adk.agents.llm_agent import LlmAgent
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from google.adk.auth.auth_credential import AuthCredentialTypes
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from google.adk.tools.bigtable import query_tool as bigtable_query_tool
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from google.adk.tools.bigtable.bigtable_credentials import BigtableCredentialsConfig
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from google.adk.tools.bigtable.bigtable_toolset import BigtableToolset
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from google.adk.tools.bigtable.settings import BigtableToolSettings
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from google.adk.tools.google_tool import GoogleTool
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import google.auth
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from google.cloud.bigtable.data.execute_query.metadata import SqlType
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# Define an appropriate credential type.
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# None for Application Default Credentials
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CREDENTIALS_TYPE = None
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# Define Bigtable tool config with read capability set to allowed.
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tool_settings = BigtableToolSettings()
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if CREDENTIALS_TYPE == AuthCredentialTypes.OAUTH2:
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# Initialize the tools to do interactive OAuth
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# The environment variables OAUTH_CLIENT_ID and OAUTH_CLIENT_SECRET
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# must be set
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credentials_config = BigtableCredentialsConfig(
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client_id=os.getenv("OAUTH_CLIENT_ID"),
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client_secret=os.getenv("OAUTH_CLIENT_SECRET"),
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scopes=[
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"https://www.googleapis.com/auth/bigtable.admin",
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"https://www.googleapis.com/auth/bigtable.data",
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],
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)
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elif CREDENTIALS_TYPE == AuthCredentialTypes.SERVICE_ACCOUNT:
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# Initialize the tools to use the credentials in the service account key.
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# If this flow is enabled, make sure to replace the file path with your own
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# service account key file
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# https://cloud.google.com/iam/docs/service-account-creds#user-managed-keys
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creds, _ = google.auth.load_credentials_from_file("service_account_key.json")
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credentials_config = BigtableCredentialsConfig(credentials=creds)
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else:
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# Initialize the tools to use the application default credentials.
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# https://cloud.google.com/docs/authentication/provide-credentials-adc
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application_default_credentials, _ = google.auth.default()
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credentials_config = BigtableCredentialsConfig(
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credentials=application_default_credentials
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)
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bigtable_toolset = BigtableToolset(
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credentials_config=credentials_config, bigtable_tool_settings=tool_settings
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)
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_BIGTABLE_PROJECT_ID = "google.com:cloud-bigtable-dev"
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_BIGTABLE_INSTANCE_ID = "annenguyen-bus-instance"
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def search_hotels_by_location(
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location_name: str,
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credentials: google.auth.credentials.Credentials,
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settings: BigtableToolSettings,
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tool_context: google.adk.tools.tool_context.ToolContext,
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):
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"""Search hotels by location name.
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This function takes a location name and returns a list of hotels
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in that area.
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Args:
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location_name (str): The geographical location (e.g., city or town) for the
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hotel search.
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Example: { "location_name": "Basel" }
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Returns:
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The hotels name, price tier.
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"""
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sql_template = """
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SELECT
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TO_INT64(cf['id']) as id,
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CAST(cf['name'] AS STRING) AS name,
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CAST(cf['location'] AS STRING) AS location,
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CAST(cf['price_tier'] AS STRING) AS price_tier,
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CAST(cf['checkin_date'] AS STRING) AS checkin_date,
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CAST(cf['checkout_date'] AS STRING) AS checkout_date
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FROM hotels
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WHERE LOWER(CAST(cf['location'] AS STRING)) LIKE LOWER(CONCAT('%', @location_name, '%'))
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"""
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return bigtable_query_tool.execute_sql(
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project_id=_BIGTABLE_PROJECT_ID,
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instance_id=_BIGTABLE_INSTANCE_ID,
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query=sql_template,
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credentials=credentials,
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settings=settings,
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tool_context=tool_context,
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parameters={"location": location_name},
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parameter_types={"location": SqlType.String()},
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)
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# The variable name `root_agent` determines what your root agent is for the
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# debug CLI
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root_agent = LlmAgent(
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model="gemini-2.5-flash",
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name="bigtable_agent",
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description=(
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"Agent to answer questions about Bigtable database tables and"
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" execute SQL queries."
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), # TODO(b/360128447): Update description
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instruction="""\
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You are a data agent with access to several Bigtable tools.
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Make use of those tools to answer the user's questions.
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""",
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tools=[
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bigtable_toolset,
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# Or, uncomment to use customized Bigtable tools.
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# GoogleTool(
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# func=search_hotels_by_location,
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# credentials_config=credentials_config,
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# tool_settings=tool_settings,
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# ),
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],
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)
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