Add fixed network mode for environments

Introduce a fixed network mode for environments. Specifically,
when this mode is activated, in the environment creation dialog
user is no longer prompted for a network and instead a network
previously assigned to the current project is used.

Network is assigned to project using project metadata key (custom)
with network ID as the value.
Specify this metadata key in Horizon config to be able to use it

This behavior is disabled by default and could be enabled by adding:

USE_FIXED_NETWORK = yes
FIXED_MURANO_NETWORK = murano_network

to the Horizon configuration.

Change-Id: Ic464e1560cc89fdc7615d51e67beb0f50e11f24c

muranodashboard/common/net.py

@@ -16,8 +16,11 @@
 import re
 import uuid
 
+from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 from horizon import exceptions
+from neutronclient.common import exceptions as exc
+from openstack_dashboard.api import keystone
 from openstack_dashboard.api import neutron
 from oslo_log import log as logging
 
@@ -35,6 +38,24 @@ NN_HELP = _("OpenStack Networking (Neutron) is not available in current "
             "environment. Custom Network Settings cannot be applied")
 
 
+def get_project_assigned_network(request):
+    tenant_id = request.user.tenant_id
+
+    tenant = keystone.tenant_get(request, tenant_id)
+    network_name = getattr(settings, 'FIXED_MURANO_NETWORK', 'murano_network')
+    tenant_network_id = getattr(tenant, network_name, None)
+    if not tenant_network_id:
+        LOG.warning(("murano_network property is not "
+                     "defined for project '%s'") % tenant_id)
+        return []
+
+    try:
+        tenant_network = neutron.network_get(request, tenant_network_id)
+        return [((tenant_network.id, None), tenant_network.name_or_id)]
+    except exc.NeutronClientException:
+        return []
+
+
 def get_available_networks(request, include_subnets=True,
                            filter=None, murano_networks=None):
     if murano_networks:

muranodashboard/environments/forms.py

@@ -13,6 +13,7 @@
 #    under the License.
 import ast
 
+from django.conf import settings
 from django import forms
 from django.utils.translation import ugettext_lazy as _
 from horizon import exceptions
@@ -39,8 +40,24 @@ class CreateEnvironmentForm(horizon_forms.SelfHandlingForm):
 
     def __init__(self, request, *args, **kwargs):
         super(CreateEnvironmentForm, self).__init__(request, *args, **kwargs)
-        net_choices = net.get_available_networks(request,
+        env_fixed_network = getattr(settings, 'USE_FIXED_NETWORK', False)
+        if env_fixed_network:
+            net_choices = net.get_project_assigned_network(request)
+            help_text = None
+            if not net_choices:
+                msg = _("Default network is either not specified for "
+                        "this project, or specified incorrectly, "
+                        "please contact administrator.")
+                messages.error(request, msg)
+                raise exceptions.ConfigurationError(msg)
+            else:
+                self.fields['net_config'].required = False
+                self.fields['net_config'].widget.attrs['readonly'] = True
+        else:
+            net_choices = net.get_available_networks(
+                request,
                 murano_networks='translate')
+
             if net_choices is None:  # NovaNetwork case
                 net_choices = [((None, None), _('Unavailable'))]
                 help_text = net.NN_HELP

releasenotes/notes/fixed-network-mode-for-envs-0af7dad3bee9957b.yaml

@@ -0,0 +1,18 @@
+---
+fixes:
+  - |
+    Introduce a fixed network mode for environments. Specifically,
+    when this mode is activated, in the environment creation dialog
+    user is no longer prompted for a network and instead a network
+    previously assigned to the current project is used.
+
+    Network is assigned to project using project metadata key (custom) with network ID as the value.
+    Specify this metadata key in Horizon config to be able to use it
+
+    This behavior is disabled by default and could be enabled by adding:
+
+    USE_FIXED_NETWORK = yes
+    FIXED_MURANO_NETWORK = murano_network
+
+    to the Horizon configuration.
+