create CloudFormation outputs and enable 'Fn::GetAtt' to work.

moto/ec2/models.py

@@ -9,6 +9,7 @@ from boto.ec2.instance import Instance as BotoInstance, Reservation
 from boto.ec2.blockdevicemapping import BlockDeviceMapping, BlockDeviceType
 from boto.ec2.spotinstancerequest import SpotInstanceRequest as BotoSpotRequest
 from boto.ec2.launchspecification import LaunchSpecification
+from boto.exception import BotoServerError
 
 from moto.core import BaseBackend
 from moto.core.models import Model
@@ -185,6 +186,15 @@ class NetworkInterface(object):
         else:
             return self._group_set
 
+    def get_cfn_attribute(self, attribute_name):
+        if attribute_name == 'PrimaryPrivateIpAddress':
+            return self.private_ip_address
+        elif attribute_name == 'SecondaryPrivateIpAddresses':
+            raise NotImplementedError('"Fn::GetAtt" : [ "{0}" , "SecondaryPrivateIpAddresses" ]"')
+        raise BotoServerError(400,
+                              'Bad Request',
+                              'Template error: resource {0} does not support attribute type {1} in Fn::GetAtt')
+
 
 class NetworkInterfaceBackend(object):
     def __init__(self):
@@ -412,6 +422,21 @@ class Instance(BotoInstance, TaggedEC2Resource):
         eni.attachment_id = None
         eni.device_index = None
 
+    def get_cfn_attribute(self, attribute_name):
+        if attribute_name == 'AvailabilityZone':
+            return self.placement
+        elif attribute_name == 'PrivateDnsName':
+            return self.private_dns_name
+        elif attribute_name == 'PublicDnsName':
+            return self.public_dns_name
+        elif attribute_name == 'PrivateIp':
+            return self.private_ip_address
+        elif attribute_name == 'PublicIp':
+            return self.ip_address
+        raise BotoServerError(400,
+                              'Bad Request',
+                              'Template error: resource {0} does not support attribute type {1} in Fn::GetAtt')
+
 
 class InstanceBackend(object):
 
@@ -971,6 +996,13 @@ class SecurityGroup(object):
                 return False
         return True
 
+    def get_cfn_attribute(self, attribute_name):
+        if attribute_name == 'GroupId':
+            return self.id
+        raise BotoServerError(400,
+                              'Bad Request',
+                              'Template error: resource {0} does not support attribute type {1} in Fn::GetAtt')
+
 
 class SecurityGroupBackend(object):
 
@@ -1494,6 +1526,13 @@ class Subnet(TaggedEC2Resource):
 
         return filter_value
 
+    def get_cfn_attribute(self, attribute_name):
+        if attribute_name == 'AvailabilityZone':
+            raise NotImplementedError('"Fn::GetAtt" : [ "{0}" , "AvailabilityZone" ]"')
+        raise BotoServerError(400,
+                              'Bad Request',
+                              'Template error: resource {0} does not support attribute type {1} in Fn::GetAtt')
+
 
 class SubnetBackend(object):
     def __init__(self):
@@ -1929,6 +1968,13 @@ class ElasticAddress(object):
     def physical_resource_id(self):
         return self.allocation_id
 
+    def get_cfn_attribute(self, attribute_name):
+        if attribute_name == 'AllocationId':
+            return self.allocation_id
+        raise BotoServerError(400,
+                              'Bad Request',
+                              'Template error: resource {0} does not support attribute type {1} in Fn::GetAtt')
+
 
 class ElasticAddressBackend(object):