使用 grpc 和云数据存储时如何修复 App Engine Flex 中的 AttributeError？

Question

当我使用 Google App Engine Flex 部署 python3 应用程序时，出现以下错误：

  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/vmagent/app/run.py", line 8, in <module>
    app = create_app(os.getenv('FLASK_CONFIG') or 'default')
  File "/home/vmagent/app/application/__init__.py", line 43, in create_app
    from .main import main as main_blueprint
  File "/home/vmagent/app/application/main/__init__.py", line 5, in <module>
    from . import cron_jobs, views
  File "/home/vmagent/app/application/main/cron_jobs.py", line 4, in <module>
    from google.cloud import datastore
  File "/env/lib/python3.6/site-packages/google/cloud/datastore/__init__.py", line 60, in <module>
    from google.cloud.datastore.batch import Batch
  File "/env/lib/python3.6/site-packages/google/cloud/datastore/batch.py", line 24, in <module>
    from google.cloud.datastore import helpers
  File "/env/lib/python3.6/site-packages/google/cloud/datastore/helpers.py", line 29, in <module>
    from google.cloud.datastore_v1.proto import datastore_pb2
  File "/env/lib/python3.6/site-packages/google/cloud/datastore_v1/__init__.py", line 18, in <module>
    from google.cloud.datastore_v1.gapic import datastore_client
  File "/env/lib/python3.6/site-packages/google/cloud/datastore_v1/gapic/datastore_client.py", line 18, in <module>
    import google.api_core.gapic_v1.client_info
  File "/env/lib/python3.6/site-packages/google/api_core/gapic_v1/__init__.py", line 26, in <module>
    from google.api_core.gapic_v1 import method_async  # noqa: F401
  File "/env/lib/python3.6/site-packages/google/api_core/gapic_v1/method_async.py", line 20, in <module>
    from google.api_core import general_helpers, grpc_helpers_async
  File "/env/lib/python3.6/site-packages/google/api_core/grpc_helpers_async.py", line 145, in <module>
    class _WrappedStreamUnaryCall(_WrappedUnaryResponseMixin, _WrappedStreamRequestMixin, aio.StreamUnaryCall):
AttributeError: module 'grpc.experimental.aio' has no attribute 'StreamUnaryCall'

我的requirements.txt文件包括以下内容：

  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/vmagent/app/run.py", line 8, in <module>
    app = create_app(os.getenv('FLASK_CONFIG') or 'default')
  File "/home/vmagent/app/application/__init__.py", line 43, in create_app
    from .main import main as main_blueprint
  File "/home/vmagent/app/application/main/__init__.py", line 5, in <module>
    from . import cron_jobs, views
  File "/home/vmagent/app/application/main/cron_jobs.py", line 4, in <module>
    from google.cloud import datastore
  File "/env/lib/python3.6/site-packages/google/cloud/datastore/__init__.py", line 60, in <module>
    from google.cloud.datastore.batch import Batch
  File "/env/lib/python3.6/site-packages/google/cloud/datastore/batch.py", line 24, in <module>
    from google.cloud.datastore import helpers
  File "/env/lib/python3.6/site-packages/google/cloud/datastore/helpers.py", line 29, in <module>
    from google.cloud.datastore_v1.proto import datastore_pb2
  File "/env/lib/python3.6/site-packages/google/cloud/datastore_v1/__init__.py", line 18, in <module>
    from google.cloud.datastore_v1.gapic import datastore_client
  File "/env/lib/python3.6/site-packages/google/cloud/datastore_v1/gapic/datastore_client.py", line 18, in <module>
    import google.api_core.gapic_v1.client_info
  File "/env/lib/python3.6/site-packages/google/api_core/gapic_v1/__init__.py", line 26, in <module>
    from google.api_core.gapic_v1 import method_async  # noqa: F401
  File "/env/lib/python3.6/site-packages/google/api_core/gapic_v1/method_async.py", line 20, in <module>
    from google.api_core import general_helpers, grpc_helpers_async
  File "/env/lib/python3.6/site-packages/google/api_core/grpc_helpers_async.py", line 145, in <module>
    class _WrappedStreamUnaryCall(_WrappedUnaryResponseMixin, _WrappedStreamRequestMixin, aio.StreamUnaryCall):
AttributeError: module 'grpc.experimental.aio' has no attribute 'StreamUnaryCall'

我使用 grpcio 版本 1.27.2 而不是最新的 1.29.0 的原因是因为这里显示的信息

有人可以帮忙吗？

Answer 1

我刚刚遇到了同样的问题，所以这可能会帮助你。我注意到这google-api-core也是一个依赖项，它最近更新（特别是围绕grpc_helpers_async），所以我只是将它固定到版本 1.17.0 并解决了这个问题。只需将其添加到您的要求中：

google-api-core==1.17.0