cyclades: Handle 'drained' flag of networks

* Export 'SNF:DRAINED' status for drained networks.
* Do not allow creation of new ports in drained networks.
* Do not allow allocation of new IPs in drained networks.

snf-cyclades-app/synnefo/api/networks.py

@@ -163,12 +163,13 @@ def network_to_dict(network, detail=True):
     d = {'id': str(network.id), 'name': network.name}
     d['links'] = util.network_to_links(network.id)
     if detail:
+        state = "SNF:DRAINED" if network.drained else network.state
         d['user_id'] = network.userid
         d['tenant_id'] = network.userid
         d['type'] = network.flavor
         d['updated'] = api.utils.isoformat(network.updated)
         d['created'] = api.utils.isoformat(network.created)
-        d['status'] = network.state
+        d['status'] = state
         d['public'] = network.public
         d['external_router'] = network.external_router
         d['admin_state_up'] = True

snf-cyclades-app/synnefo/logic/ips.py

@@ -46,6 +46,10 @@ def allocate_ip(network, userid, address=None, floating_ip=False):
     if network.action == "DESTROY":
         raise faults.Conflict("Cannot allocate IP. Network %s is being"
                               " deleted" % network.id)
+    elif network.drained:
+        raise faults.Conflict("Can not allocate IP while network '%s' is in"
+                              " 'SNF:DRAINED' status" % network.id)
+
     ip_pools = IPPoolTable.objects.select_for_update()\
         .filter(subnet__network=network)
     try:

snf-cyclades-app/synnefo/logic/servers.py

@@ -401,11 +401,15 @@ def _create_port(userid, network, machine=None, use_ipaddress=None,
 
     """
     if network.state != "ACTIVE":
-        raise faults.BuildInProgress("Cannot create port while network is in"
-                                     " state %s" % network.state)
-    if network.action == "DESTROY":
+        raise faults.Conflict("Cannot create port while network '%s' is in"
+                              " '%s' status" % (network.id, network.state))
+    elif network.drained:
+        raise faults.Conflict("Cannot create port while network %s is in"
+                              " 'SNF:DRAINED' status" % network.id)
+    elif network.action == "DESTROY":
         msg = "Cannot create port. Network %s is being deleted."
         raise faults.Conflict(msg % network.id)
+
     ipaddress = None
     if use_ipaddress is not None:
         # Use an existing IPAddress object.