[feat] first draft of sync_state in memory

This commit changes sync_state to be in memory, with all tests passing.
The memory variable for now is a dict with each key composed by
source_replica_uid and sync_id, replicating CouchDB implementation. Next
steps includes migrating this to Beaker and refactor/clean up code.

Changed the module's INFO dict to use Beaker's caching and adapted
methods to get and save from it. Still needs refactoring, all tests
passes.

Beaker is now using memory as default; It is configurable, but we aren't
opening the possibility of config now for security. We need to check
what can be misconfigured first.

We are not sure if beaker will be the definitive solution for server
side caching. This change isolates it with more granularity.
In order to replace it, just change get_cache_for to return the proper
caching object using another implementation. This caching object is
supposed to behave as a dict.

1 files changed, 32 insertions, 0 deletions

diff --git a/server/src/leap/soledad/server/caching.py b/server/src/leap/soledad/server/caching.py
new file mode 100644
index 00000000..cd5d8dd4
--- /dev/null
+++ b/server/src/leap/soledad/server/caching.py
@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+# caching.py
+# Copyright (C) 2015 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/>.
+"""
+Server side caching. Using beaker for now.
+"""
+from beaker.cache import CacheManager
+
+
+def setup_caching():
+    _cache_manager = CacheManager(type='memory')
+    return _cache_manager
+
+
+_cache_manager = setup_caching()
+
+
+def get_cache_for(key):
+    return _cache_manager.get_cache(key)