Trouble with defaults and timeout decorator

[Jason Friedman]

I'm writing a database connectivity module to be used by other modules and
leveraging the jaydebeapi module.
>From what I can tell jaydebeapi contains no built-in timeout capability, so
then I turned to https://pypi.org/project/timeout-decorator/.
My goal is to have a default timeout of, say, 10 seconds, which can be
overridden by the caller.


import jaydebeapi
from timeout_decorator import timeout

class Database:
database_connection = None
database_name, user_name, password, host, port = stuff
timeout = None

def __init__(self, timeout=10):
self.timeout = timeout

@timeout(self.timeout)
def get_connection(self):
if not self.database_connection:
self.database_connection = jaydebeapi.connect(some_args)
return self.database_connection


The trouble occurs on line 12 with:
NameError: name 'self' is not defined

[Piergiorgio Sartor]

A quick search would return that "self"
is not available in the class body, only
in the class methods.

There are workarounds, but I guess not
simple ones, expecially for "timeout".

bye,

--

piergiorgio

[MRAB]

On 2023-06-24 17:18, Jason Friedman via Python-list wrote:
> I'm writing a database connectivity module to be used by other modules and
> leveraging the jaydebeapi module.
> From what I can tell jaydebeapi contains no built-in timeout capability, so
> then I turned to https://pypi.org/project/timeout-decorator/.
> My goal is to have a default timeout of, say, 10 seconds, which can be
> overridden by the caller.
>
>
> import jaydebeapi
> from timeout_decorator import timeout
>
> class Database:
> database_connection = None
> database_name, user_name, password, host, port = stuff
> timeout = None
>
> def __init__(self, timeout=10):
> self.timeout = timeout
>
> @timeout(self.timeout)
> def get_connection(self):
> if not self.database_connection:
> self.database_connection = jaydebeapi.connect(some_args)
> return self.database_connection
>
>
> The trouble occurs on line 12 with:
> NameError: name 'self' is not defined

The decorator is applied when the class is defined, but 'self' exists
only in 'Database.__init__' and 'Database.get_connection' when they are
called.

Have you tried applying the decorator "manually" in 'Database.__init__'?

def __init__(self, timeout=10):
self.timeout = timeout

self.get_connection = timeout(self.timeout)(self.get_connection)