Implement InternetGateway filters support

More information about IGW filters: http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-DescribeInternetGateways.html#query-DescribeInternetGateways-filters

moto/ec2/models.py

@@ -1867,6 +1867,13 @@ class InternetGateway(TaggedEC2Resource):
     def physical_resource_id(self):
         return self.id
 
+    @property
+    def attachment_state(self):
+        if self.vpc:
+            return "available"
+        else:
+            return "detached"
+
 
 class InternetGatewayBackend(object):
     def __init__(self):

moto/ec2/responses/internet_gateways.py

@@ -1,8 +1,13 @@
 from __future__ import unicode_literals
 from moto.core.responses import BaseResponse
-from moto.ec2.utils import sequence_from_querystring
+from moto.ec2.utils import (
+    sequence_from_querystring,
+    filters_from_querystring,
+    filter_internet_gateways,
+)
 from jinja2 import Template
 
+
 class InternetGateways(BaseResponse):
     def attach_internet_gateway(self):
         igw_id = self.querystring.get("InternetGatewayId", [None])[0]
@@ -23,15 +28,16 @@ class InternetGateways(BaseResponse):
         return template.render()
 
     def describe_internet_gateways(self):
-        if "Filter.1.Name" in self.querystring:
-            raise NotImplementedError(
-                "Filtering not supported in describe_internet_gateways.")
-        elif "InternetGatewayId.1" in self.querystring:
+        if "InternetGatewayId.1" in self.querystring:
             igw_ids = sequence_from_querystring(
                 "InternetGatewayId", self.querystring)
             igws = self.ec2_backend.describe_internet_gateways(igw_ids)
         else:
             igws = self.ec2_backend.describe_internet_gateways()
+
+        filter_dict = filters_from_querystring(self.querystring)
+        igws = filter_internet_gateways(igws, filter_dict)
+
         template = Template(DESCRIBE_INTERNET_GATEWAYS_RESPONSE)
         return template.render(internet_gateways=igws)
 

moto/ec2/utils.py

@@ -269,17 +269,9 @@ def keypair_names_from_querystring(querystring_dict):
     return keypair_names
 
 
-filter_dict_attribute_mapping = {
-    'instance-state-name': 'state',
-    'instance-id': 'id',
-    'state-reason-code': '_state_reason.code',
-    'source-dest-check': 'source_dest_check',
-    'vpc-id': 'vpc_id',
-}
-
-def get_instance_value(instance, instance_attr):
-    keys = instance_attr.split('.')
-    val = instance
+def get_object_value(obj, attr):
+    keys = attr.split('.')
+    val = obj
     for key in keys:
         if hasattr(val, key):
             val = getattr(val, key)
@@ -289,18 +281,40 @@ def get_instance_value(instance, instance_attr):
             return None
     return val
 
+
+def is_tag_filter(filter_name):
+    return filter_name.startswith('tag:')
+
+
+def get_obj_tag(obj, filter_name):
+    tag_name = filter_name.replace('tag:', '', 1)
+    tags = dict((tag['key'], tag['value']) for tag in obj.get_tags())
+    return tags.get(tag_name)
+
+
+def tag_filter_matches(obj, filter_name, filter_values):
+    tag_value = get_obj_tag(obj, filter_name)
+    return tag_value in filter_values
+
+
+filter_dict_attribute_mapping = {
+    'instance-state-name': 'state',
+    'instance-id': 'id',
+    'state-reason-code': '_state_reason.code',
+    'source-dest-check': 'source_dest_check',
+    'vpc-id': 'vpc_id',
+}
+
+
 def passes_filter_dict(instance, filter_dict):
     for filter_name, filter_values in filter_dict.items():
         if filter_name in filter_dict_attribute_mapping:
             instance_attr = filter_dict_attribute_mapping[filter_name]
-            instance_value = get_instance_value(instance, instance_attr)
+            instance_value = get_object_value(instance, instance_attr)
             if instance_value not in filter_values:
                 return False
-        elif filter_name.startswith('tag:'):
-            tags = dict((tag['key'], tag['value']) for tag in instance.get_tags())
-            tag_name = filter_name.replace('tag:', '', 1)
-            tag_value = tags.get(tag_name)
-            if tag_value not in filter_values:
+        elif is_tag_filter(filter_name):
+            if not tag_filter_matches(instance, filter_name, filter_values):
                 return False
         else:
             raise NotImplementedError(
@@ -322,6 +336,37 @@ def filter_reservations(reservations, filter_dict):
     return result
 
 
+filter_dict_igw_mapping = {
+    "attachment.vpc-id": "vpc.id",
+    "attachment.state": "attachment_state",
+    "internet-gateway-id": "id",
+}
+
+
+def passes_igw_filter_dict(igw, filter_dict):
+    for filter_name, filter_values in filter_dict.items():
+        if filter_name in filter_dict_igw_mapping:
+            igw_attr = filter_dict_igw_mapping[filter_name]
+            if get_object_value(igw, igw_attr) not in filter_values:
+                return False
+        elif is_tag_filter(filter_name):
+            if not tag_filter_matches(igw, filter_name, filter_values):
+                return False
+        else:
+            raise NotImplementedError(
+                "Internet Gateway 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
+
+
+def filter_internet_gateways(igws, filter_dict):
+    result = []
+    for igw in igws:
+        if passes_igw_filter_dict(igw, filter_dict):
+            result.append(igw)
+    return result
+
+
 def is_filter_matching(obj, filter, filter_value):
     value = obj.get_filter_value(filter)
 

tests/test_ec2/test_internet_gateways.py

@@ -163,3 +163,60 @@ def test_igw_desribe_bad_id():
     cm.exception.code.should.equal('InvalidInternetGatewayID.NotFound')
     cm.exception.status.should.equal(400)
     cm.exception.request_id.should_not.be.none
+
+
+@mock_ec2
+def test_igw_filter_by_vpc_id():
+    """ internet gateway filter by vpc id """
+    conn = boto.connect_vpc('the_key', 'the_secret')
+
+    igw1 = conn.create_internet_gateway()
+    igw2 = conn.create_internet_gateway()
+    vpc = conn.create_vpc(VPC_CIDR)
+    conn.attach_internet_gateway(igw1.id, vpc.id)
+
+    result = conn.get_all_internet_gateways(filters={"attachment.vpc-id": vpc.id})
+    result.should.have.length_of(1)
+    result[0].id.should.equal(igw1.id)
+
+
+@mock_ec2
+def test_igw_filter_by_tags():
+    """ internet gateway filter by vpc id """
+    conn = boto.connect_vpc('the_key', 'the_secret')
+
+    igw1 = conn.create_internet_gateway()
+    igw2 = conn.create_internet_gateway()
+    igw1.add_tag("tests", "yes")
+
+    result = conn.get_all_internet_gateways(filters={"tag:tests": "yes"})
+    result.should.have.length_of(1)
+    result[0].id.should.equal(igw1.id)
+
+
+@mock_ec2
+def test_igw_filter_by_internet_gateway_id():
+    """ internet gateway filter by internet gateway id """
+    conn = boto.connect_vpc('the_key', 'the_secret')
+
+    igw1 = conn.create_internet_gateway()
+    igw2 = conn.create_internet_gateway()
+
+    result = conn.get_all_internet_gateways(filters={"internet-gateway-id": igw1.id})
+    result.should.have.length_of(1)
+    result[0].id.should.equal(igw1.id)
+
+
+@mock_ec2
+def test_igw_filter_by_attachment_state():
+    """ internet gateway filter by attachment state """
+    conn = boto.connect_vpc('the_key', 'the_secret')
+
+    igw1 = conn.create_internet_gateway()
+    igw2 = conn.create_internet_gateway()
+    vpc = conn.create_vpc(VPC_CIDR)
+    conn.attach_internet_gateway(igw1.id, vpc.id)
+
+    result = conn.get_all_internet_gateways(filters={"attachment.state": "available"})
+    result.should.have.length_of(1)
+    result[0].id.should.equal(igw1.id)