fix: remove dependency on pkg_resources (#361)

Fixes #360 🦕

Author: parthea

google/api_core/client_info.py

@@ -21,8 +21,6 @@
 import platform
 from typing import Union
 
-import pkg_resources
-
 from google.api_core import version as api_core_version
 
 _PY_VERSION = platform.python_version()
@@ -31,8 +29,10 @@
 _GRPC_VERSION: Union[str, None]
 
 try:
-    _GRPC_VERSION = pkg_resources.get_distribution("grpcio").version
-except pkg_resources.DistributionNotFound:  # pragma: NO COVER
+    import grpc
+
+    _GRPC_VERSION = grpc.__version__
+except ImportError:  # pragma: NO COVER
     _GRPC_VERSION = None
 
 

google/api_core/grpc_helpers.py

@@ -18,7 +18,6 @@
 import functools
 
 import grpc
-import pkg_resources
 
 from google.api_core import exceptions
 import google.auth
@@ -33,14 +32,6 @@
 except ImportError:
     HAS_GRPC_GCP = False
 
-try:
-    # google.auth.__version__ was added in 1.26.0
-    _GOOGLE_AUTH_VERSION = google.auth.__version__
-except AttributeError:
-    try:  # try pkg_resources if it is available
-        _GOOGLE_AUTH_VERSION = pkg_resources.get_distribution("google-auth").version
-    except pkg_resources.DistributionNotFound:  # pragma: NO COVER
-        _GOOGLE_AUTH_VERSION = None
 
 # The list of gRPC Callable interfaces that return iterators.
 _STREAM_WRAP_CLASSES = (grpc.UnaryStreamMultiCallable, grpc.StreamStreamMultiCallable)

google/api_core/operations_v1/transports/base.py

@@ -16,26 +16,21 @@
 import abc
 from typing import Awaitable, Callable, Optional, Sequence, Union
 
-import pkg_resources
-
 import google.api_core  # type: ignore
 from google.api_core import exceptions as core_exceptions  # type: ignore
 from google.api_core import gapic_v1  # type: ignore
 from google.api_core import retry as retries  # type: ignore
+from google.api_core import version
 import google.auth  # type: ignore
 from google.auth import credentials as ga_credentials  # type: ignore
 from google.longrunning import operations_pb2
 from google.oauth2 import service_account  # type: ignore
 from google.protobuf import empty_pb2  # type: ignore
 
-try:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
-        gapic_version=pkg_resources.get_distribution(
-            "google.api_core.operations_v1",
-        ).version,
-    )
-except pkg_resources.DistributionNotFound:
-    DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
+
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=version.__version__,
+)
 
 
 class OperationsTransport(abc.ABC):