Learning to use decorators with classes

[Mr SZ]

Hi,

I'm writing an LDAP plugin for my TG2 application. In this I wrote a small class based decorator with args to set up a connection and call the necessary
functionality but I'm having problems with it. Here's my code:

class getConnection(object):

    def __init__(self, settings, credentials):
        self.settings = settings
        self.credentials = credentials

    def __call__(self, f):
        def wrapped_f(*args, **kw):
            ...code snipped...
            try:
                if tls:
                    connection.start_tls_s()
                if anon:
                    con.simple_bind_s()
                else:
                    con.simple_bind_s( dn, pw )
            except ldap.LDAPError, e:
                print e.message['info']
            else:
                kw['conn'] = connection
                try:
                    f(*args, **kw)
                except Exception, e:
                    print 'Exception in Plugin execution: %s' % e
                finally:
                    connection.unbind()

        return wrapped_f


class LdapPlugin(Plugin):
    ...
    def __init__(self, **kw):
        Plugin.__init__(self)
        
    @getConnection(self._settings, self.__cred__)
    def search(self, **kw):
        print 'Searching'
        ...


Here the base class constructor(Plugin) fetches plugin specific settings from the web framework and stores it in self._settings and user info in self.__cred__ . Now when the method is invoked, this is the error I get:


File '.../plugins/ldap/ldap/__init__.py', line 69 in LdapPlugin
  @getConnection(self._settings, self.__cred__)
NameError: name 'self' is not defined



I can simply write a method that gets a connection and deal with it but I wanted to know and learn why decorators is not working in this case.

Regards,
SZ


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