Switch from oauth2client to google-auth (googleapis#2726)

* Removes all use of oauth2client from every package and tests.
* Updates core to use google-auth's default credentials, project ID, and scoping logic.
* Updates bigtable to use google-auth's scoping logic.

bigquery/unit_tests/test_client.py

@@ -28,7 +28,7 @@ def _make_one(self, *args, **kw):
     def test_ctor(self):
         from google.cloud.bigquery._http import Connection
         PROJECT = 'PROJECT'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         self.assertIsInstance(client._connection, Connection)
@@ -57,7 +57,7 @@ def test_list_projects_defaults(self):
                  'friendlyName': 'Two'},
             ]
         }
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT_1, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -86,7 +86,7 @@ def test_list_projects_explicit_response_missing_projects_key(self):
         PATH = 'projects'
         TOKEN = 'TOKEN'
         DATA = {}
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -128,7 +128,7 @@ def test_list_datasets_defaults(self):
                  'friendlyName': 'Two'},
             ]
         }
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -156,7 +156,7 @@ def test_list_datasets_explicit_response_missing_datasets_key(self):
         PATH = 'projects/%s/datasets' % PROJECT
         TOKEN = 'TOKEN'
         DATA = {}
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -180,7 +180,7 @@ def test_dataset(self):
         from google.cloud.bigquery.dataset import Dataset
         PROJECT = 'PROJECT'
         DATASET = 'dataset_name'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         dataset = client.dataset(DATASET)
@@ -190,7 +190,7 @@ def test_dataset(self):
 
     def test_job_from_resource_unknown_type(self):
         PROJECT = 'PROJECT'
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         with self.assertRaises(ValueError):
             client.job_from_resource({'configuration': {'nonesuch': {}}})
@@ -304,7 +304,7 @@ def test_list_jobs_defaults(self):
                 LOAD_DATA,
             ]
         }
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -360,7 +360,7 @@ def test_list_jobs_load_job_wo_sourceUris(self):
                 LOAD_DATA,
             ]
         }
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -388,7 +388,7 @@ def test_list_jobs_explicit_missing(self):
         PATH = 'projects/%s/jobs' % PROJECT
         DATA = {}
         TOKEN = 'TOKEN'
-        creds = _Credentials()
+        creds = object()
         client = self._make_one(PROJECT, creds)
         conn = client._connection = _Connection(DATA)
 
@@ -419,7 +419,7 @@ def test_load_table_from_storage(self):
         DATASET = 'dataset_name'
         DESTINATION = 'destination_table'
         SOURCE_URI = 'http://example.com/source.csv'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         dataset = client.dataset(DATASET)
@@ -438,7 +438,7 @@ def test_copy_table(self):
         DATASET = 'dataset_name'
         SOURCE = 'source_table'
         DESTINATION = 'destination_table'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         dataset = client.dataset(DATASET)
@@ -458,7 +458,7 @@ def test_extract_table_to_storage(self):
         DATASET = 'dataset_name'
         SOURCE = 'source_table'
         DESTINATION = 'gs://bucket_name/object_name'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         dataset = client.dataset(DATASET)
@@ -475,7 +475,7 @@ def test_run_async_query_defaults(self):
         PROJECT = 'PROJECT'
         JOB = 'job_name'
         QUERY = 'select count(*) from persons'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         job = client.run_async_query(JOB, QUERY)
@@ -511,7 +511,7 @@ def test_run_async_w_query_parameters(self):
         PROJECT = 'PROJECT'
         JOB = 'job_name'
         QUERY = 'select count(*) from persons'
-        creds = _Credentials()
+        creds = object()
         http = object()
         client = self._make_one(project=PROJECT, credentials=creds, http=http)
         query_parameters = [ScalarQueryParameter('foo', 'INT64', 123)]
@@ -575,19 +575,6 @@ def test_run_sync_query_w_query_parameters(self):
         self.assertEqual(query.query_parameters, query_parameters)
 
 
-class _Credentials(object):
-
-    _scopes = None
-
-    @staticmethod
-    def create_scoped_required():
-        return True
-
-    def create_scoped(self, scope):
-        self._scopes = scope
-        return self
-
-
 class _Connection(object):
 
     def __init__(self, *responses):

bigtable/google/cloud/bigtable/client.py

@@ -29,6 +29,7 @@
 
 import os
 
+import google.auth.credentials
 from google.longrunning import operations_grpc
 
 from google.cloud._helpers import make_insecure_stub
@@ -201,14 +202,16 @@ def __init__(self, project=None, credentials=None,
         else:
             scopes.append(DATA_SCOPE)
 
+        self._read_only = bool(read_only)
+
         if admin:
             scopes.append(ADMIN_SCOPE)
 
         self._admin = bool(admin)
-        try:
-            credentials = credentials.create_scoped(scopes)
-        except AttributeError:
-            pass
+
+        credentials = google.auth.credentials.with_scopes_if_required(
+            credentials, scopes)
+
         self._credentials = credentials
         self.user_agent = user_agent
         self.emulator_host = os.getenv(BIGTABLE_EMULATOR)
@@ -229,12 +232,10 @@ def copy(self):
         :rtype: :class:`.Client`
         :returns: A copy of the current client.
         """
-        credentials = self._credentials
-        copied_creds = credentials.create_scoped(credentials.scopes)
         return self.__class__(
             self.project,
-            copied_creds,
-            READ_ONLY_SCOPE in copied_creds.scopes,
+            self._credentials,
+            self._read_only,
             self._admin,
             self.user_agent,
         )

bigtable/tox.ini

@@ -7,6 +7,7 @@ localdeps =
     pip install --quiet --upgrade {toxinidir}/../core
 deps =
     {toxinidir}/../core
+    mock
     pytest
 covercmd =
     py.test --quiet \