# HG changeset patch
# User martin f. krafft <madduck@madduck.net>
# Date 1334351380 -7200
# Node ID 85517c8fde361af0855add80826f518ddd954bb8
# Parent  3acbff7276268b1bba238a26571e58c6e86654ce
Modify Account class to handle NULL references

This patch modifies the Account class to defer to using the associated
domain's tid/ssid/qid fields if the per-instance fields are None/NULL.

diff -r 3acbff727626 -r 85517c8fde36 VirtualMailManager/account.py
--- a/VirtualMailManager/account.py	Fri Apr 13 17:49:14 2012 +0200
+++ b/VirtualMailManager/account.py	Fri Apr 13 23:09:40 2012 +0200
@@ -59,9 +59,9 @@
                        self._addr.domainname, NO_SUCH_DOMAIN)
         self._uid = 0
         self._mail = None
-        self._qlimit = self._domain.quotalimit
-        self._services = self._domain.serviceset
-        self._transport = self._domain.transport
+        self._qlimit = None
+        self._services = None
+        self._transport = None
         self._passwd = None
         self._new = True
         self._load()
@@ -81,12 +81,19 @@
         dbc.close()
         if result:
             self._uid, _mid, _qid, _ssid, _tid = result
-            if _qid != self._qlimit.qid:
-                self._qlimit = QuotaLimit(self._dbh, qid=_qid)
-            if _ssid != self._services.ssid:
-                self._services = ServiceSet(self._dbh, ssid=_ssid)
-            if _tid != self._transport.tid:
-                self._transport = Transport(self._dbh, tid=_tid)
+
+            def load_helper(ctor, own, field, dbresult):
+                cur = None if own is None else getattr(own, field)
+                if cur != dbresult:
+                    kwargs = { field : dbresult }
+                    return None if dbresult is None \
+                                else ctor(self._dbh, **kwargs)
+
+            self._qlimit = load_helper(QuotaLimit, self._qlimit, 'qid', _qid)
+            self._services = load_helper(ServiceSet, self._services, 'ssid',
+                                         _ssid)
+            self._transport = load_helper(Transport, self._transport, 'tid',
+                                          _tid)
             self._mail = MailLocation(self._dbh, mid=_mid)
             self._new = False
 
@@ -223,8 +230,10 @@
                     'qid, ssid, tid) VALUES (%s, %s, %s, %s, %s, %s, %s, %s)',
                     (self._addr.localpart,
                      pwhash(self._passwd, user=self._addr), self._uid,
-                     self._domain.gid, self._mail.mid, self._qlimit.qid,
-                     self._services.ssid, self._transport.tid))
+                     self._domain.gid, self._mail.mid,
+                     self._qlimit.qid if self._qlimit else None,
+                     self._services.ssid if self._services else None,
+                     self._transport.tid if self._transport else None))
         self._dbh.commit()
         dbc.close()
         self._new = False
@@ -267,11 +276,13 @@
             raise VMMError(_(u'PostgreSQL-based dictionary quota requires '
                              u'Dovecot >= v1.1.2.'), VMM_ERROR)
         self._chk_state()
-        assert isinstance(quotalimit, QuotaLimit)
         if quotalimit == self._qlimit:
             return
-        self._update_tables('qid', quotalimit.qid)
         self._qlimit = quotalimit
+        if quotalimit is not None:
+            assert isinstance(quotalimit, QuotaLimit)
+            quotalimit = quotalimit.qid
+        self._update_tables('qid', quotalimit)
 
     def update_serviceset(self, serviceset):
         """Assign a different set of services to the Account.
@@ -282,11 +293,13 @@
           the new service set.
         """
         self._chk_state()
-        assert isinstance(serviceset, ServiceSet)
         if serviceset == self._services:
             return
-        self._update_tables('ssid', serviceset.ssid)
         self._services = serviceset
+        if serviceset is not None:
+            assert isinstance(serviceset, ServiceSet)
+            serviceset = serviceset.ssid
+        self._update_tables('ssid', serviceset)
 
     def update_transport(self, transport):
         """Sets a new transport for the Account.
@@ -297,17 +310,39 @@
           the new transport
         """
         self._chk_state()
-        assert isinstance(transport, Transport)
         if transport == self._transport:
             return
-        if transport.transport.lower() in ('virtual', 'virtual:') and \
-           not self._mail.postfix:
-            raise AErr(_(u"Invalid transport '%(transport)s' for mailbox "
-                         u"format '%(mbfmt)s'.") %
-                       {'transport': transport, 'mbfmt': self._mail.mbformat},
-                       INVALID_MAIL_LOCATION)
-        self._update_tables('tid', transport.tid)
         self._transport = transport
+        if transport is not None:
+            assert isinstance(transport, Transport)
+            if transport.transport.lower() in ('virtual', 'virtual:') and \
+                not self._mail.postfix:
+                raise AErr(_(u"Invalid transport '%(transport)s' for mailbox "
+                             u"format '%(mbfmt)s'.") %
+                           {'transport': transport, 'mbfmt': self._mail.mbformat},
+                           INVALID_MAIL_LOCATION)
+            transport = transport.tid
+        self._update_tables('tid', transport)
+
+    def _get_info_transport(self):
+        if self._transport:
+            return self._transport.transport
+        return format_domain_default(self._domain.transport.transport)
+
+    def _get_info_serviceset(self):
+        if self._services:
+            services = self._services.services
+            fmt = lambda s: s
+        else:
+            services = self._domain.serviceset.services
+            fmt = format_domain_default
+
+        ret = {}
+        for service, state in services.iteritems():
+            # TP: A service (e.g. pop3 or imap) may be enabled/usable or
+            # disabled/unusable for a user.
+            ret[service] = fmt((_('disabled'), _('enabled'))[state])
+        return ret
 
     def get_info(self):
         """Returns a dict with some information about the Account.
@@ -326,10 +361,7 @@
         dbc.close()
         if info:
             info = dict(zip(('name', 'uq_bytes', 'uq_messages'), info))
-            for service, state in self._services.services.iteritems():
-                # TP: A service (e.g. pop3 or imap) may be enabled/usable or
-                # disabled/unusable for a user.
-                info[service] = (_('disabled'), _('enabled'))[state]
+            info.update(self._get_info_serviceset())
             info['address'] = self._addr
             info['gid'] = self._domain.gid
             info['home'] = '%s/%s' % (self._domain.directory, self._uid)