I wrote some python code to perform automatic measurements and analysis via Logic 2. On two different PCs it’s running just fine, on a third one I can’t get it to work. For the exact error which is showing up (grpc_message:“Stream removed”), please see the attached file (the “…” is a path on the local machine, which I removed for sharing the traceback).
I’m using these versions:
- Logic 2.4.10
- Python 3.9.5
- Python package logic2-automation 1.0.6
- Python package grpcio 1.59.2
- Python package protobuf 4.24.4
- Python package pywin32 306
One of the other PCs, which the script successfully runs on, has the exact same versions installed.
I already tried reinstalling python and Logic2, but it didn’t change anything.
Any ideas on what might cause this issue?
logic_2_grpc_error_stream_removed.txt (1.9 KB)
Hi @luca.schaaf ,
This looks like a grpc/networking issue. A few questions and things to try:
- Is there anything different about the networking setup on the machine that is failing? Any other notable differences?
- Can you share the full script that you are running?
- To confirm, you are running Logic 2 with the automation server enabled, on the same machine that you are running your python script?
- GRPC has 2 environment variables you can set that might provide more insight into what is happening. The env variables are documented at https://github.com/grpc/grpc/blob/master/TROUBLESHOOTING.md. I would try
GRPC_VERBOSITY=debug and start with
GRPC_TRACE=http,http2_stream_state. There are other GRPC_TRACE tracers listed at https://github.com/grpc/grpc/blob/master/doc/environment_variables.md.
I can help take a look at the output from the GRPC logging if you post it here (or shoot me a DM).
thank you for your response. Please see my answers below:
- To my knowledge the network setup is not different. All three devices are managed by the same company system and the only settings I did was to set the http_proxy and https_proxy on the affected machine since it was not set initially (but is set on the other machines, I needed it for installing packages via pip). I didn’t notice any other differences between the machines, on none of them gRPC is used otherwise.
- I will send you a DM with the script attached.
- The automation server is enabled inside Logic 2.
- I ran the script again with the settings you mentioned. Sadly, I can’t upload the resulting log file here for some reason. I’ll try to include it in the DM as well.
@huffman Thank you very much again for figuring this out!
Disabling the gRPC proxy usage (can i.e. be done using python):
with automation.Manager.connect(..., grpc_channel_arguments=[("grpc.enable_http_proxy", 0)]) as manager:
Potential root cause:
Despite all three machines used being administrated the same way, the environment variables
https_proxy initially weren’t set on the machine with the issue, but they were set on the other two machines (on which the issue didn’t occur). I had to set the environment variables before being able to run the python script, since I needed them to install packages (i.ei
logic2-automation) via pip.
It seems like there probably is a difference in the network configuration of these machines, which caused the need to set the environment variables and also the issue described in the post above.