pyATS: How to handle exception with dev.connect()

assadniang — Wed, 25 Oct 2023 04:44:11 GMT

How would I handle this exception with dev.connect()

When I try to connect to a device and the device is not available, the code crashes with the following exception

How would I handle the exception, so it does not crash and continue

I am rebooting the router, and I have a loop to try to connect every 60sec

If the connection fails, try to connect again, until the connection is establish

from pyats.topology import loader testbed = loader.load('devices.yaml') dev = testbed.devices['rtr1'] dev.connect() ---------------------- This is what I have tried ----------------- try: dev.connect() except OSError as error: print('error')

ssh: connect to host f207:a185:172:30:7:0:513:1 port 22: No route to host 2023-10-25 00:17:20,520: %UNICON-INFO: +++ connection to spawn: ssh -l root f207:a185:172:30:7:0:513:1, id: 140184778444464 +++ 2023-10-25 00:17:20,521: %UNICON-INFO: connection to ptr513-u210 Traceback (most recent call last): File "src/unicon/eal/backend/pty_backend.py", line 498, in unicon.eal.backend.pty_backend.RawPtySpawn._read OSError: [Errno 5] Input/output error The above exception was the direct cause of the following exception: Traceback (most recent call last): File "src/unicon/statemachine/statemachine.py", line 737, in unicon.statemachine.statemachine.StateMachine.go_to File "src/unicon/statemachine/statetransition.py", line 469, in unicon.statemachine.statetransition.AnyStateTransition.do_transitions File "src/unicon/eal/backend/pty_backend.py", line 342, in unicon.eal.backend.pty_backend.RawSpawn.expect File "src/unicon/eal/backend/pty_backend.py", line 135, in unicon.eal.backend.pty_backend.RawSpawn.read_update_buffer File "src/unicon/eal/backend/pty_backend.py", line 120, in unicon.eal.backend.pty_backend.RawSpawn.read File "src/unicon/eal/backend/pty_backend.py", line 501, in unicon.eal.backend.pty_backend.RawPtySpawn._read unicon.core.errors.EOF: ('Unable to read. Connection closed or not available', OSError(5, 'Input/output error')) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "src/unicon/bases/connection.py", line 792, in unicon.bases.connection.Connection.connect File "src/unicon/bases/routers/connection_provider.py", line 227, in unicon.bases.routers.connection_provider.BaseSingleRpConnectionProvider.connect File "src/unicon/bases/routers/connection_provider.py", line 253, in unicon.bases.routers.connection_provider.BaseSingleRpConnectionProvider.establish_connection File "src/unicon/statemachine/statemachine.py", line 740, in unicon.statemachine.statemachine.StateMachine.go_to unicon.core.errors.StateMachineError: Failed while bringing device to "any" state The above exception was the direct cause of the following exception: Traceback (most recent call last): File "<stdin>", line 2, in <module> File "src/pyats/connections/manager.py", line 453, in pyats.connections.manager.ConnectionManager.connect File "src/unicon/bases/connection.py", line 799, in unicon.bases.connection.Connection.connect unicon.core.errors.ConnectionError: failed to connect to ptr513-u210 Failed while bringing device to "any" state

Re: pyATS: How to handle exception with dev.connect()

Marcel Zehnder — Wed, 25 Oct 2023 06:15:49 GMT

This should work:

from unicon.core.errors import TimeoutError, StateMachineError, ConnectionError try: # do your connection here except (TimeoutError, StateMachineError, ConnectionError): # handle the error here

HTH

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pyATS: How to handle exception with dev.connect()

Re: pyATS: How to handle exception with dev.connect()