Creates get_elasticache_replication_groups_by_region method to handle the API call

plugins/inventory/ec2.py

@@ -366,6 +366,7 @@ class Ec2Inventory(object):
                 self.get_rds_instances_by_region(region)
             if self.elasticache_enabled:
                 self.get_elasticache_clusters_by_region(region)
+                self.get_elasticache_replication_groups_by_region(region)
 
         self.write_to_cache(self.inventory, self.cache_path_cache)
         self.write_to_cache(self.index, self.cache_path_index)
@@ -462,6 +463,40 @@ class Ec2Inventory(object):
         for cluster in clusters:
             self.add_elasticache_cluster(cluster, region)
 
+    def get_elasticache_replication_groups_by_region(self, region):
+        ''' Makes an AWS API call to the list of ElastiCache replication groups
+        in a particular region.'''
+
+        # ElastiCache boto module doesn't provide a get_all_intances method,
+        # that's why we need to call describe directly (it would be called by
+        # the shorthand method anyway...)
+        try:
+            conn = elasticache.connect_to_region(region)
+            if conn:
+                response = conn.describe_replication_groups()
+
+        except boto.exception.BotoServerError as e:
+            error = e.reason
+
+            if e.error_code == 'AuthFailure':
+                error = self.get_auth_error_message()
+            if not e.reason == "Forbidden":
+                error = "Looks like AWS RDS is down:\n%s" % e.message
+            self.fail_with_error(error)
+
+        try:
+            # Boto also doesn't provide wrapper classes to ReplicationGroups
+            # Because of that wo can't make use of the get_list method in the
+            # AWSQueryConnection. Let's do the work manually
+            replication_groups = response['DescribeReplicationGroupsResponse']['DescribeReplicationGroupsResult']['ReplicationGroups']
+
+        except KeyError as e:
+            error = "ElastiCache query to AWS failed (unexpected format)."
+            self.fail_with_error(error)
+
+        for replication_group in replication_groups:
+            self.add_elasticache_replication_group(replication_group, region)
+
     def get_auth_error_message(self):
         ''' create an informative error message if there is an issue authenticating'''
         errors = ["Authentication error retrieving ec2 inventory."]