Added functionality to assign FloatingIP addresses

The Instance class got an boolean field 'assignFloatingIp', false by default.
If this is set 'true', the instance will attempt to assign a floating ip in one
of its networks (starting from default ones)

NetworkExplorer class got a functionality to dicover the ID of the external network:
- for newly created networks it will use their specified external router's external_gateway_info
- for existing networks it will iterate among all their routers

Change-Id: I754cd41ffacbf2a2ec62ac23c3a5a7883d1e13b5
Closes-Bug: #1314193

meta/io.murano.lib.networks.Neutron/Classes/NewNetwork.yaml

@@ -51,6 +51,9 @@ Workflow:
     Arguments:
       - instance:
           Contract: $.class(res:Instance).notNull()
+      - assignFloatingIp:
+          Contract: $.bool().notNull()
+          Default: false
     Body:
       - $.ensureNetworkConfigured()
       - $portname: $instance.name + '-port-to-' + $.id()
@@ -67,6 +70,33 @@ Workflow:
                   - Ref: $portname
       - $.environment.stack.updateTemplate($template)
 
+      - If: $assignFloatingIp
+        Then:
+          - $extNetId: $.netExplorer.getExternalNetworkIdForRouter($.externalRouterId)
+          - If: $extNetId != null
+            Then:
+              - $fip_name: $instance.name + '-FloatingIP-' + $.id()
+              - $template:
+                  Resources:
+                    $fip_name:
+                      Type: 'OS::Neutron::FloatingIP'
+                      Properties:
+                        floating_network_id: $extNetId
+                    $instance.name + '-FloatingIpAssoc-' + $.id():
+                      Type: 'OS::Neutron::FloatingIPAssociation'
+                      Properties:
+                        floatingip_id:
+                          Ref: $fip_name
+                        port_id:
+                          Ref: $portname
+                  Outputs:
+                    $instance.name + '-FloatingIPaddress':
+                      Value:
+                        Fn::GetAtt:
+                          - $fip_name
+                          - floating_ip_address
+                      Description: Floating IP assigned
+              - $.environment.stack.updateTemplate($template)
 
   ensureNetworkConfigured:
     Body:
@@ -127,5 +157,3 @@ Workflow:
                 router_id: $.externalRouterId
                 subnet_id: {Ref: $.subnet_res_name}
       - $.environment.stack.updateTemplate($template)
-
-

meta/io.murano/Classes/resources/Instance.yaml

@@ -29,6 +29,12 @@ Properties:
       useEnvironmentNetwork: true
       useFlatNetwork: false
       customNetworks: []
+  assignFloatingIp:
+    Contract: $.bool().notNull()
+    Default: false
+  floatingIpAddress:
+    Contract: $.string()
+    Usage: Out
 
 Workflow:
   initialize:
@@ -64,7 +70,7 @@ Workflow:
       - $.environment.stack.push()
       - $outputs: $.environment.stack.output()
       - $.ipAddresses: $outputs.get(format('{0}-PublicIp', $this.name))
-
+      - $.floatingIpAddress: $outputs.get(format('{0}-FloatingIPaddress', $this.name))
       - $.environment.instanceNotifier.trackApplication($this)
 
   joinNet:
@@ -74,7 +80,13 @@ Workflow:
     Body:
       - If: $net != null
         Then:
-          $net.addHostToNetwork($)
+          - If: $.assignFloatingIp and (not bool($.getAttr(fipAssigned)))
+            Then:
+              - $assignFip: true
+              - $.setAttr(fipAssigned, true)
+            Else:
+              - $assignFip: false
+          - $net.addHostToNetwork($, $assignFip)
 
   destroy:
     Body:

muranoapi/engine/system/net_explorer.py

@@ -102,6 +102,33 @@ class NetworkExplorer(murano_object.MuranoObject):
     def getDefaultDns(self):
         return self._settings.default_dns
 
+    # noinspection PyPep8Naming
+    def getExternalNetworkIdForRouter(self, routerId):
+        router = self._neutron.show_router(routerId).get('router')
+        if not router or 'external_gateway_info' not in router:
+            return None
+        return router['external_gateway_info'].get('network_id')
+
+    # noinspection PyPep8Naming
+    def getExternalNetworkIdForNetwork(self, networkId):
+        network = self._neutron.show_network(networkId).get('network')
+        if network.get('router:external', False):
+            return networkId
+
+        # Get router interfaces of the network
+        router_ports = self._neutron.list_ports(
+            **{'device_owner': 'network:router_interface',
+               'network_id': networkId}).get('ports')
+
+        # For each router this network is connected to
+        # check if the router has external_gateway set
+        for router_port in router_ports:
+            ext_net_id = self.getExternalNetworkIdForRouter(
+                router_port.get('device_id'))
+            if ext_net_id:
+                return ext_net_id
+        return None
+
     def _get_cidrs_taken_by_router(self, router_id):
         if not router_id:
             return []