1 files changed, 69 insertions, 0 deletions
diff --git a/src/leap/mail/imap/index.py b/src/leap/mail/imap/index.py
new file mode 100644
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+++ b/src/leap/mail/imap/index.py
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+# -*- coding: utf-8 -*-
+# index.py
+# Copyright (C) 2013 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Index for SoledadBackedAccount, Mailbox and Messages.
+"""
+import logging
+
+from leap.common.check import leap_assert, leap_assert_type
+
+from leap.mail.imap.fields import fields
+
+
+logger = logging.getLogger(__name__)
+
+
+class IndexedDB(object):
+    """
+    Methods dealing with the index.
+
+    This is a MixIn that needs access to the soledad instance,
+    and also assumes that a INDEXES attribute is accessible to the instance.
+
+    INDEXES must be a dictionary of type:
+    {'index-name': ['field1', 'field2']}
+    """
+    # TODO we might want to move this to soledad itself, check
+
+    def initialize_db(self):
+        """
+        Initialize the database.
+        """
+        leap_assert(self._soledad,
+                    "Need a soledad attribute accesible in the instance")
+        leap_assert_type(self.INDEXES, dict)
+
+        # Ask the database for currently existing indexes.
+        if not self._soledad:
+            logger.debug("NO SOLEDAD ON IMAP INITIALIZATION")
+            return
+        db_indexes = dict()
+        if self._soledad is not None:
+            db_indexes = dict(self._soledad.list_indexes())
+        for name, expression in fields.INDEXES.items():
+            if name not in db_indexes:
+                # The index does not yet exist.
+                self._soledad.create_index(name, *expression)
+                continue
+
+            if expression == db_indexes[name]:
+                # The index exists and is up to date.
+                continue
+            # The index exists but the definition is not what expected, so we
+            # delete it and add the proper index expression.
+            self._soledad.delete_index(name)
+            self._soledad.create_index(name, *expression)