Problem with grpc Python on Ubuntu 16.04

[Zachary Deretsky]

My code exhibits the same problem as the example helloworld:

zach@Roma:/DEV/STAGE/grpc/examples/python/helloworld$ python greeter_server.py 

Traceback (most recent call last):

  File "greeter_server.py", line 34, in <module>

    import helloworld_pb2

  File "/DEV/STAGE/grpc/examples/python/helloworld/helloworld_pb2.py", line 112, in <module>

    from grpc.beta import implementations as beta_implementations

  File "/usr/local/lib/python2.7/dist-packages/grpc/beta/implementations.py", line 39, in <module>

    from grpc import _auth

  File "/usr/local/lib/python2.7/dist-packages/grpc/_auth.py", line 43, in <module>

    class GoogleCallCredentials(grpc.AuthMetadataPlugin):

AttributeError: 'module' object has no attribute 'AuthMetadataPlugin'

I did ran pip install grpcio and pip install grpcio-tools

Thanks, Zach.

[i...@meridianapps.com]

Hi Zach,

I just ran into this trying to get up and running myself - I think the package versions on pypi have not been updated from this issue? https://github.com/grpc/grpc/issues/6935

Anyway, in the meantime I just installed grpc from master into my virtualenv (as per that issue) with GRPC_PYTHON_BUILD_WITH_CYTHON=1 venv/bin/pip install --upgrade .

Hope that helps!

[Zachary Deretsky]

On Thursday, June 30, 2016 at 3:23:28 PM UTC-7, Zachary Deretsky wrote:

[Zachary Deretsky]

Thank you.

Could you post more detail?

I compiled grpc from source. Do you mean that I need to recompile it with the environment var h GRPC_PYTHON_BUILD_WITH_CYTHON=1 ?

What does "pip install --upgrade" do?

Zach.

On Thursday, June 30, 2016 at 3:23:28 PM UTC-7, Zachary Deretsky wrote:

[i...@meridianapps.com]

Sure thing, though I'm super familiar with pip or grpc, I was just messing about and lucked into something that worked for me.

With a bare pip install grpcio on pip version 8.1.2 in a fresh virtualenv, I was running into the same problems as you were when I ran the greeter_server.py example - eg, the AuthMetadaPlugin ImportError. What fixed it for me was checking out the grpc repo and, at its root directory in the master branch, running 'GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install --upgrade .'

This gave me a version of grpcio in my virtualenv that was built from the master branch rather than the release currently available on pypi. I wouldn't recommend relying on the master branch being stable of course - I was just trying to get through the tutorial. Ideally whatever the issue is with the pypi release will be fixed, but this worked for me in the meantime.

[Ken Payson]

I can confirm the issue that you are seeing.  There was a bug in the 0.15.0 release of grpico-tools, so likely you have grpcio-tools 0.14.0 and grpcio 0.15.0 installed.  The 0.14.0 grpcio-tools release has namespace conflicts with grpcio 0.15.0, which is causing what you are seeing.  A temporary workaround is to uninstall grpcio and grpcio-tools, and then install grpcio-tools and grpcio in that order.

On Thursday, June 30, 2016 at 3:23:28 PM UTC-7, Zachary Deretsky wrote:

[Zachary Deretsky]

Ken,

thank you, your suggestion resolved this problem.

Zach.

[Ken Payson]

grpcio-tools 0.15.1 has been released.  If anyone experiences this problem and installed grpcio and grpcio-tools between 2016-06-29 10:08 UTC and 2016-07-02 00:50 UTC, they should re-install both packages.

On Thursday, June 30, 2016 at 3:23:28 PM UTC-7, Zachary Deretsky wrote: