Provide access to Trove client

python-troveclient is required for implementing Database As A
Service (DBaaS) resource. This patch makes Heat depend on
python-troveclient and also changing clients.py and resource.py
to provide access to troveclient.

Implements: blueprint dbaas-trove-resource

Change-Id: I010d4a11793cc634aa0af5f01b637fff4effbf61

heat/engine/clients.py

@@ -41,6 +41,12 @@ except ImportError:
     cinderclient = None
     logger.info(_('cinderclient not available'))
 
+try:
+    from troveclient import client as troveclient
+except ImportError:
+    troveclient = None
+    logger.info(_('troveclient not available'))
+
 try:
     from ceilometerclient.v2 import client as ceilometerclient
 except ImportError:
@@ -68,6 +74,7 @@ class OpenStackClients(object):
         self._swift = None
         self._neutron = None
         self._cinder = None
+        self._trove = None
         self._ceilometer = None
 
     @property
@@ -195,6 +202,32 @@ class OpenStackClients(object):
 
         return self._cinder
 
+    def trove(self, service_type="database"):
+        if troveclient is None:
+            return None
+        if self._trove:
+            return self._trove
+
+        con = self.context
+        if self.auth_token is None:
+            logger.error(_("Trove connection failed, no auth_token!"))
+            return None
+
+        args = {
+            'service_type': service_type,
+            'auth_url': con.auth_url,
+            'proxy_token': con.auth_token,
+            'username': None,
+            'password': None
+        }
+
+        self._trove = troveclient.Client('1.0', **args)
+        management_url = self.url_for(service_type=service_type)
+        self._trove.client.auth_token = con.auth_token
+        self._trove.client.management_url = management_url
+
+        return self._trove
+
     def ceilometer(self):
         if ceilometerclient is None:
             return None

heat/engine/resource.py

@@ -338,6 +338,9 @@ class Resource(object):
     def cinder(self):
         return self.stack.clients.cinder()
 
+    def trove(self):
+        return self.stack.clients.trove()
+
     def ceilometer(self):
         return self.stack.clients.ceilometer()
 

requirements.txt

@@ -22,6 +22,7 @@ python-swiftclient>=1.5
 python-neutronclient>=2.3.0,<3
 python-ceilometerclient>=1.0.6
 python-cinderclient>=1.0.6
+python-troveclient>=1.0.0
 PyYAML>=3.1.0
 paramiko>=1.8.0
 Babel>=1.3