Error: No module named 'ns3gym.messages_pb2' about ns3-gym

[pgawlowicz]

Hi,

Thank you for pointing out this issue.

The readme file was simply wrong, and I have already fixed it (swapped points 3 and 4).
First, you have to run:
./waf configure
that generates both C++ and Python Protocol Buffer messages and only then you can install python module using:
pip3 install ./src/opengym/model/ns3gym

In addition, I have added some more checks to prevent installing python module without messages_pb2.py file as well as forcing to use protoc compiler in version 3.

Best,
Piotr

[pgawlowicz]

Hi,
Probably ns3 project is being built during this long time. You should build the project before using:
./waf build

If you install the ns3gym python module inside a virtual environment, you have to build ns3 in the same virtual env, using ./waf build

However, the build is done only once and then examples should run immediately.

BR,
Piotr

[huckiyang]

Dear Piotr

thanks for the kind reply, I will try your solution.
I manually added the messages_pb2.py a few hours ago.
in the path

python3.6/site-packages/ns3gym/

the error message seems to disappear.
btw, does it take a long while to initiate the gym.make('ns3-v0'), more than 10min?