From: Tomas Sedovic <tomas@sedovic.cz>
Date: Thu, 13 Dec 2012 17:22:07 +0000 (+0100)
Subject: Add configurable cloud backend
X-Git-Tag: 2014.1~1016
X-Git-Url: https://review.fuel-infra.org/gitweb?a=commitdiff_plain;h=714c3f9e7c2e1945e1b3a68a032d8e62b5f35cc4;p=openstack-build%2Fheat-build.git

Add configurable cloud backend

This allows us to use a different IaaS backend (other than OpenStack).
OpenStack is still used by default.

Change-Id: I1772d57ae583a281204edfb80fbfde220b004a9d
Signed-off-by: Tomas Sedovic <tomas@sedovic.cz>
---

diff --git a/etc/heat/heat-engine.conf b/etc/heat/heat-engine.conf
index 82a47175..755df057 100644
--- a/etc/heat/heat-engine.conf
+++ b/etc/heat/heat-engine.conf
@@ -50,6 +50,10 @@ use_syslog = False
 # Facility to use. If unset defaults to LOG_USER.
 # syslog_log_facility = LOG_LOCAL0
 
+# The namespace for the custom backend. Must provide class Clients which will be
+# imported. Defaults to OpenStack if none provided.
+# cloud_backend=deltacloud_heat.client
+
 sql_connection = mysql://heat:heat@localhost/heat
 
 db_backend=heat.db.sqlalchemy.api
diff --git a/heat/engine/clients.py b/heat/engine/clients.py
index 6ac05054..7a42b788 100644
--- a/heat/engine/clients.py
+++ b/heat/engine/clients.py
@@ -13,6 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from heat.openstack.common import cfg
+from heat.openstack.common import importutils
 from heat.openstack.common import log as logging
 
 logger = logging.getLogger(__name__)
@@ -32,7 +34,15 @@ except ImportError:
     logger.info('quantumclient not available')
 
 
-class Clients(object):
+cloud_opts = [
+    cfg.StrOpt('cloud_backend',
+               default=None,
+               help="Cloud module to use as a backend. Defaults to OpenStack.")
+]
+cfg.CONF.register_opts(cloud_opts)
+
+
+class OpenStackClients(object):
     '''
     Convenience class to create and cache client instances.
     '''
@@ -162,3 +172,12 @@ class Clients(object):
         self._quantum = quantumclient.Client(**args)
 
         return self._quantum
+
+
+if cfg.CONF.cloud_backend:
+    cloud_backend_module = importutils.import_module(cfg.CONF.cloud_backend)
+    Clients = cloud_backend_module.Clients
+else:
+    Clients = OpenStackClients
+
+logger.debug('Using backend %s' % Clients)