Error when trying example to open active project with flexlogger 2021 R1

[tcase]

Running the code below I get the following error - flexlogger version 2021 R1 Build number 8.4.0.49979:

from flexlogger.automation import Application
app = Application()
project = app.get_active_project()

Traceback (most recent call last):
  File "C:\Python36\lib\site-packages\flexlogger\automation\_application.py", line 223, in get_active_project
    response = stub.GetActiveProject(FlexLoggerApplication_pb2.GetActiveProjectRequest())
  File "C:\Python36\lib\site-packages\grpc\_channel.py", line 923, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "C:\Python36\lib\site-packages\grpc\_channel.py", line 826, in _end_unary_response_blocking
    raise _InactiveRpcError(state)
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
        status = StatusCode.UNAVAILABLE
        details = "failed to connect to all addresses"
        debug_error_string = "{"created":"@1608052709.612000000","description":"Failed to pick subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":4143,"referenced_errors":[{"created":"@1608052633.077000000","description":"failed to connect to all addresses","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line":398,"grpc_status":14}]}"
>

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python36\lib\site-packages\flexlogger\automation\_application.py", line 236, in get_active_project
    raise FlexLoggerError("Failed to get the active project") from rpc_error
flexlogger.automation._flexlogger_error.FlexLoggerError: <exception str() failed>

"C:\ProgramData\National Instruments\FlexLogger\LastAutomationPort.txt" contains: 49793

[gregstoll]

Hi Travis -

Hmm, that's interesting. Can you confirm that the preference under the General tab for "Enable FlexLogger to receive remote automation commands" is on? And was there a project open in FlexLogger when you called get_active_project()?

Thanks!

Greg Stoll FlexLogger R&D

[tcase]

Yes I can confirm both of those conditions are true

[gregstoll]

Hmm, OK. Do you see the same behavior if you try to call Application.launch() and then get_active_project()? And what about if you call open_project() instead of get_active_project()?

Thanks!

Greg Stoll FlexLogger R&D

[gregstoll]

I tried this internally and it works, so I'm guessing something about our machine setups is different.

One possibility is that your machine is using a proxy; can you try putting the following code before the call to Application()?

if os.environ.get('https_proxy'):
    del os.environ['https_proxy']
if os.environ.get('http_proxy'):
    del os.environ['http_proxy']

Another possibility is that the client is trying to connect over IPv6 instead of IPv4. We can try changing line 119 in _application.py from

            self._channel = insecure_channel("localhost:%d" % self._server_port)

to

            self._channel = insecure_channel("127.0.0.1:%d" % self._server_port)

Let me know if you're able to try these!

Greg Stoll FlexLogger R&D

[tcase]

We are using a proxy on our hosts and it looks like removing that is fixing the problem. not sure why thats happening as the proxy should not be messing with localhost connections.

[tcase]

ok i think I figured out the proxy issue, I need to change our env var from:

os.environ['no_proxy'] = 'intel.com,127.0.0.1' to os.environ['no_proxy'] = 'intel.com,127.0.0.1,localhost'

thanks for your help @gregstoll !

[tcase]

@gregstoll can we get a note added to the documentation to say that ni is using http traffic and honors proxy env vars related to that?

[gregstoll]

Yes, that's a good idea. I also wonder if we should be using 127.0.0.1 instead of localhost in our code, which I'm guessing would have avoided this issue.