p4pgw crashes:"UnboundLocalError: local variable 'handler' referenced before assignment"

[amichelotti]

Hello, trying the following configuration p4p crashes:

config.json:

{
    "version": 2,
    "clients":[
        {
            "name":"cam1",
            "addrlist": "cam01.eli.svc",
            "autoaddrlist":false
        }
    ],
    "servers": [
        {
            "name": "$name",
            "clients": [],                        <--- I thought that could be more permissive. But it makes the p4p crash.
            "addrlist": "",
            "autoaddrlist": false,
            "statusprefix": "GW:STS:"
        }
    ]
}

Output:

Traceback (most recent call last):
  File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.10/dist-packages/p4p/gw.py", line 815, in <module>
    main()
  File "/usr/local/lib/python3.10/dist-packages/p4p/gw.py", line 804, in main
    app = App(args)
  File "/usr/local/lib/python3.10/dist-packages/p4p/gw.py", line 672, in __init__
    handler.asTestPV = SharedPV(nt=NTScalar('s'), initial="Only RPC supported.")
UnboundLocalError: local variable 'handler' referenced before assignment

[mdavidsaver]

"clients": [], <--- I thought that could be more permissive. But it makes the p4p crash.

This has the opposite effect. When combined with "statusprefix", this should create a server which only provides gateway status PVs. I suppose a valid use case, although not one I have tested. Which, python being so dynamic, probably explains why it doesn't work.