Merge pull request #218 from thedrow/feature/vpc-filters

Added the cider block, dhcp options id and tag filter to the VPC backend

moto/ec2/models.py

@@ -84,6 +84,15 @@ class TaggedEC2Instance(object):
         tags = ec2_backend.describe_tags(self.id)
         return tags
 
+    def get_filter_value(self, filter_name):
+        tags = self.get_tags()
+
+        if filter_name.startswith('tag:'):
+            tagname = filter_name.split('tag:')[1]
+            for tag in tags:
+                if tag['key'] == tagname:
+                    return tag['value']
+
 
 class NetworkInterface(object):
     def __init__(self, subnet, private_ip_address, device_index=0, public_ip_auto_assign=True, group_ids=None):
@@ -1139,6 +1148,25 @@ class VPC(TaggedEC2Instance):
     def physical_resource_id(self):
         return self.id
 
+    def get_filter_value(self, filter_name):
+        if filter_name == 'cidr':
+            return self.cidr_block
+        elif filter_name == 'dhcp-options-id':
+            if not self.dhcp_options:
+                return None
+
+            return self.dhcp_options.id
+
+        filter_value = super(VPC, self).get_filter_value(filter_name)
+
+        if not filter_value:
+            msg = "The filter '{0}' for DescribeVPCs has not been" \
+                  " implemented in Moto yet. Feel free to open an issue at" \
+                  " https://github.com/spulec/moto/issues".format(filter_name)
+            raise NotImplementedError(msg)
+
+        return filter_value
+
 
 class VPCBackend(object):
     def __init__(self):
@@ -1164,8 +1192,17 @@ class VPCBackend(object):
             raise InvalidVPCIdError(vpc_id)
         return self.vpcs.get(vpc_id)
 
-    def get_all_vpcs(self):
-        return self.vpcs.values()
+    def get_all_vpcs(self, vpc_ids=None, filters=None):
+        if vpc_ids:
+            vpcs = [vpc for vpc in self.vpcs.values() if vpc.id in vpc_ids]
+        else:
+            vpcs = self.vpcs.values()
+
+        if filters:
+            for (_filter, _filter_value) in filters.items():
+                vpcs = [ vpc for vpc in vpcs if vpc.get_filter_value(_filter) in _filter_value ]
+
+        return vpcs
 
     def delete_vpc(self, vpc_id):
         # Delete route table if only main route table remains.

moto/ec2/responses/vpcs.py

@@ -3,6 +3,7 @@ from jinja2 import Template
 
 from moto.core.responses import BaseResponse
 from moto.ec2.models import ec2_backend
+from moto.ec2.utils import filters_from_querystring, vpc_ids_from_querystring
 
 
 class VPCs(BaseResponse):
@@ -19,7 +20,9 @@ class VPCs(BaseResponse):
         return template.render(vpc=vpc)
 
     def describe_vpcs(self):
-        vpcs = ec2_backend.get_all_vpcs()
+        vpc_ids = vpc_ids_from_querystring(self.querystring)
+        filters = filters_from_querystring(self.querystring)
+        vpcs = ec2_backend.get_all_vpcs(vpc_ids=vpc_ids, filters=filters)
         template = Template(DESCRIBE_VPCS_RESPONSE)
         return template.render(vpcs=vpcs)
 

moto/ec2/utils.py

@@ -84,6 +84,7 @@ def random_public_ip():
     return '54.214.{0}.{1}'.format(random.choice(range(255)),
                                    random.choice(range(255)))
 
+
 def random_ip():
     return "127.{0}.{1}.{2}".format(
         random.randint(0, 255),
@@ -97,7 +98,7 @@ def generate_route_id(route_table_id, cidr_block):
 
 
 def split_route_id(route_id):
-    values = string.split(route_id,'~')
+    values = string.split(route_id, '~')
     return values[0], values[1]
 
 
@@ -125,6 +126,14 @@ def route_table_ids_from_querystring(querystring_dict):
     return route_table_ids
 
 
+def vpc_ids_from_querystring(querystring_dict):
+    vpc_ids = []
+    for key, value in querystring_dict.items():
+        if 'VpcId' in key:
+            vpc_ids.append(value[0])
+    return vpc_ids
+
+
 def sequence_from_querystring(parameter, querystring_dict):
     parameter_values = []
     for key, value in querystring_dict.items():
@@ -201,13 +210,14 @@ def filters_from_querystring(querystring_dict):
         if match:
             filter_index = match.groups()[0]
             value_prefix = "Filter.{0}.Value".format(filter_index)
-            filter_values = [filter_value[0] for filter_key, filter_value in querystring_dict.items() if filter_key.startswith(value_prefix)]
+            filter_values = [filter_value[0] for filter_key, filter_value in querystring_dict.items() if
+                             filter_key.startswith(value_prefix)]
             response_values[value[0]] = filter_values
     return response_values
 
 
 def dict_from_querystring(parameter, querystring_dict):
-    use_dict={}
+    use_dict = {}
     for key, value in querystring_dict.items():
         match = re.search(r"{0}.(\d).(\w+)".format(parameter), key)
         if match:
@@ -216,7 +226,7 @@ def dict_from_querystring(parameter, querystring_dict):
 
             if not use_dict.get(use_dict_index):
                 use_dict[use_dict_index] = {}
-            use_dict[use_dict_index][use_dict_element_property]=value[0]
+            use_dict[use_dict_index][use_dict_element_property] = value[0]
 
     return use_dict
 
@@ -249,7 +259,9 @@ def passes_filter_dict(instance, filter_dict):
             if tag_value not in filter_values:
                 return False
         else:
-            raise NotImplementedError("Filter dicts have not been implemented in Moto for '%s' yet. Feel free to open an issue at https://github.com/spulec/moto/issues", filter_name)
+            raise NotImplementedError(
+                "Filter dicts have not been implemented in Moto for '%s' yet. Feel free to open an issue at https://github.com/spulec/moto/issues",
+                filter_name)
     return True