add delete_rule to elbv2

moto/elbv2/models.py

@@ -357,6 +357,18 @@ class ELBv2Backend(BaseBackend):
     def delete_load_balancer(self, arn):
         self.load_balancers.pop(arn, None)
 
+    def delete_rule(self, arn):
+        for load_balancer_arn in self.load_balancers:
+            listeners = self.load_balancers.get(load_balancer_arn).listeners.values()
+            for listener in listeners:
+                for rule in listener.rules:
+                    if rule.arn == arn:
+                        listener.rules.remove(rule)
+                        return
+
+        # should raise RuleNotFound Error according to the AWS API doc
+        # however, boto3 does't raise error even if rule is not found
+
     def delete_target_group(self, target_group_arn):
         target_group = self.target_groups.pop(target_group_arn)
         if target_group:

moto/elbv2/responses.py

@@ -157,6 +157,12 @@ class ELBV2Response(BaseResponse):
         template = self.response_template(DELETE_LOAD_BALANCER_TEMPLATE)
         return template.render()
 
+    def delete_rule(self):
+        arn = self._get_param('RuleArn')
+        self.elbv2_backend.delete_rule(arn)
+        template = self.response_template(DELETE_RULE_TEMPLATE)
+        return template.render()
+
     def delete_target_group(self):
         arn = self._get_param('TargetGroupArn')
         self.elbv2_backend.delete_target_group(arn)
@@ -448,6 +454,13 @@ DELETE_LOAD_BALANCER_TEMPLATE = """<DeleteLoadBalancerResponse xmlns="http://ela
   </ResponseMetadata>
 </DeleteLoadBalancerResponse>"""
 
+DELETE_RULE_TEMPLATE = """<DeleteRuleResponse xmlns="http://elasticloadbalancing.amazonaws.com/doc/2015-12-01/">
+  <DeleteRuleResult/>
+  <ResponseMetadata>
+    <RequestId>1549581b-12b7-11e3-895e-1334aEXAMPLE</RequestId>
+  </ResponseMetadata>
+</DeleteRuleResponse>"""
+
 DELETE_TARGET_GROUP_TEMPLATE = """<DeleteTargetGroupResponse xmlns="http://elasticloadbalancing.amazonaws.com/doc/2015-12-01/">
   <DeleteTargetGroupResult/>
   <ResponseMetadata>

tests/test_elbv2/test_elbv2.py

@@ -614,6 +614,10 @@ def test_create_listener_rules():
     priorities = [rule['Priority'] for rule in rules['Rules']]
     priorities.should.equal(['50', '100', 'default'])
 
+    arn = rules['Rules'][0]['RuleArn']
+    conn.delete_rule(RuleArn=arn)
+    # TODO: describe rule and ensure rule is removed
+
     # test for invalid action type
     safe_priority = 2
     with assert_raises(ClientError):