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fix(db_api): allow file path for credentials (#221)
* fix: credentials_uri parameter error

* fix: combine credentials and credentials_uri

* fix: nits
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HemangChothani committed Mar 10, 2021
1 parent af23775 commit 1de028430b779a50d38242fe70567e92b560df5a
Showing with 38 additions and 5 deletions.
  1. +13 −5 google/cloud/spanner_dbapi/
  2. +25 −0 tests/unit/spanner_dbapi/
@@ -357,10 +357,13 @@ def connect(
instances, tables and data. If not provided, will
attempt to determine from the environment.
:type credentials: :class:`~google.auth.credentials.Credentials`
:type credentials: Union[:class:`~google.auth.credentials.Credentials`, str]
:param credentials: (Optional) The authorization credentials to attach to
requests. These credentials identify this application
to the service. If none are specified, the client will
to the service. These credentials may be specified as
a file path indicating where to retrieve the service
account JSON for the credentials to connect to
Cloud Spanner. If none are specified, the client will
attempt to ascertain the credentials from the
@@ -384,9 +387,14 @@ def connect(
user_agent=user_agent or DEFAULT_USER_AGENT, python_version=PY_VERSION

client = spanner.Client(
project=project, credentials=credentials, client_info=client_info
if isinstance(credentials, str):
client = spanner.Client.from_service_account_json(
credentials, project=project, client_info=client_info
client = spanner.Client(
project=project, credentials=credentials, client_info=client_info

instance = client.instance(instance_id)
if not instance.exists():
@@ -139,3 +139,28 @@ def test_sessions_pool(self):
connect("test-instance", database_id, pool=pool)
database_mock.assert_called_once_with(database_id, pool=pool)

def test_connect_w_credential_file_path(self):
from import connect
from import Connection

PROJECT = "test-project"
USER_AGENT = "user-agent"
credentials = "dummy/file/path.json"

with mock.patch(
) as client_mock:
connection = connect(

self.assertIsInstance(connection, Connection)

credentials, project=PROJECT, client_info=mock.ANY

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