fix: kill mutable default arguments

autopush/exceptions.py

@@ -12,8 +12,8 @@ class InvalidTokenException(Exception):
 class InvalidRequest(AutopushException):
     """Invalid request exception, may include custom status_code and message
     to write for the error"""
-    def __init__(self, message, status_code=400, errno=None, headers={}):
+    def __init__(self, message, status_code=400, errno=None, headers=None):
         super(AutopushException, self).__init__(message)
         self.status_code = status_code
         self.errno = errno
-        self.headers = headers
+        self.headers = {} if headers is None else headers

autopush/router/interface.py

@@ -8,12 +8,12 @@ class RouterException(AutopushException):
 
     """
     def __init__(self, message, status_code=500, response_body="",
-                 router_data=None, headers={}, log_exception=True,
+                 router_data=None, headers=None, log_exception=True,
                  errno=None, logged_status=None):
         """Create a new RouterException"""
         super(AutopushException, self).__init__(message)
         self.status_code = status_code
-        self.headers = headers
+        self.headers = {} if headers is None else headers
         self.log_exception = log_exception
         self.response_body = response_body or message
         self.errno = errno
@@ -29,12 +29,12 @@ class RouterResponse(object):
 
     """
     def __init__(self, status_code=200, response_body="", router_data=None,
-                 headers={}, errno=None, logged_status=None):
+                 headers=None, errno=None, logged_status=None):
         """Create a new RouterResponse"""
         self.status_code = status_code
         self.response_body = response_body
         self.router_data = router_data
-        self.headers = headers
+        self.headers = {} if headers is None else headers
         self.errno = errno
         self.logged_status = logged_status
 

autopush/settings.py

@@ -66,7 +66,7 @@ def __init__(self,
                  endpoint_scheme=None,
                  endpoint_hostname=None,
                  endpoint_port=None,
-                 router_conf={},
+                 router_conf=None,
                  router_tablename="router",
                  router_read_throughput=5,
                  router_write_throughput=5,
@@ -84,7 +84,7 @@ def __init__(self,
                  wake_timeout=0,
                  env='development',
                  enable_cors=False,
-                 senderid_list={},
+                 senderid_list=None,
                  hello_timeout=0,
                  bear_hash_key=None,
                  preflight_uaid="deadbeef00000000deadbeef000000000",
@@ -138,6 +138,8 @@ def __init__(self,
         self.endpoint_hostname = endpoint_hostname or self.hostname
         self.router_hostname = router_hostname or self.hostname
 
+        if router_conf is None:
+            router_conf = {}
         self.router_conf = router_conf
         self.router_url = canonical_url(
             router_scheme or 'http',