[Answered ]-LDAP gidNumber like Auto Integer

Following @jeemster suggestion, i found the way to manage gidNumber.

Fist of all: i created a new entry on my LDAP called “gidNumber” and i added the optional attribute description to contain the last gidNumber i used (class: organizationalUnit, ou: gidNumber, description: 500).

Then i created the following functions:

def ldap_gid_finder(self):

        # Locates the suport-entry with a simple query
        self.baseDN = "ou=impianti,dc=ldap,dc=dem2m,dc=it"
        self.searchScope = ldap.SCOPE_SUBTREE
        self.retrieveAttributes = None
        self.searchFilter = "ou=*gidNumber*"

        # Results are putted in a dictionary
        self.ldap_result = self.connector.search(
            self.baseDN, self.searchScope, self.searchFilter, self.retrieveAttributes)
        result_set = []
        while 1:
            result_type, result_data = self.connector.result(self.ldap_result, 0)
            if (result_data == []):
                break
            else:
                if result_type == ldap.RES_SEARCH_ENTRY:
                    result_set.append(result_data)

        # The attribute containing gidNumber is passed to an instanced variable
        self.actual_gid_number = int(result_set[0][0][1]['description'][0])

    # Provides to gidNumber incrementation
    def ldap_gid_increment(self):

        dn = "ou=gidNumber,ou=impianti,dc=ldap,dc=dem2m,dc=it"

        old = {'description': str(self.actual_gid_number)}
        new = {'description': str(self.actual_gid_number + 1)}

        ldif = modlist.modifyModlist(old,new)

        self.connector.modify_s(dn, ldif)

As i sad above, these methods are defined in a class of which i overrided constructor and destructor, in order to bind/unbind automatically to LDAP server when i instance or delete the instance.

Then, i used a query on LDAP to find the object called gidNumber (the ou i created before), and i filled a dictionary with resulting information. In the dictionary i found the variable representing the gidNumber and i used integer casting to manipulate it for incrementing. And that’s all.

This procedure i really efficent because i server reboots you don’t lose gidNumber information! Thank you again, jeemster.