Allow mock_s3 to use the standalone moto server running in alternative endpoint by adding TEST_SERVER_MODE_ENDPOINT environment variable (#4723)

docs/docs/server_mode.rst

@@ -119,7 +119,7 @@ It is possible to keep the state in between tests, using this environment variab
 
 .. code-block:: bash
 
-    MOTO_CALL_RESET_API=true
+    MOTO_CALL_RESET_API=false
 
 
 Dashboard

moto/core/models.py

@@ -388,7 +388,7 @@ MockAWS = BotocoreEventMockAWS
 
 class ServerModeMockAWS(BaseMockAWS):
     def __init__(self, *args, **kwargs):
-        self.port = settings.moto_server_port()
+        self.test_server_mode_endpoint = settings.test_server_mode_endpoint()
         super().__init__(*args, **kwargs)
 
     def reset(self):
@@ -396,7 +396,7 @@ class ServerModeMockAWS(BaseMockAWS):
         if not call_reset_api or call_reset_api.lower() != "false":
             import requests
 
-            requests.post(f"http://localhost:{self.port}/moto-api/reset")
+            requests.post(f"{self.test_server_mode_endpoint}/moto-api/reset")
 
     def enable_patching(self, reset=True):
         if self.__class__.nested_count == 1 and reset:
@@ -414,12 +414,12 @@ class ServerModeMockAWS(BaseMockAWS):
                     config = Config(user_agent_extra="region/" + region)
                     kwargs["config"] = config
             if "endpoint_url" not in kwargs:
-                kwargs["endpoint_url"] = f"http://localhost:{self.port}"
+                kwargs["endpoint_url"] = self.test_server_mode_endpoint
             return real_boto3_client(*args, **kwargs)
 
         def fake_boto3_resource(*args, **kwargs):
             if "endpoint_url" not in kwargs:
-                kwargs["endpoint_url"] = f"http://localhost:{self.port}"
+                kwargs["endpoint_url"] = self.test_server_mode_endpoint
             return real_boto3_resource(*args, **kwargs)
 
         self._client_patcher = patch("boto3.client", fake_boto3_client)

moto/core/responses.py

@@ -141,13 +141,13 @@ class ActionAuthenticatorMixin(object):
 
     @staticmethod
     def set_initial_no_auth_action_count(initial_no_auth_action_count):
-        _port = settings.moto_server_port()
+        _test_server_mode_endpoint = settings.test_server_mode_endpoint()
 
         def decorator(function):
             def wrapper(*args, **kwargs):
                 if settings.TEST_SERVER_MODE:
                     response = requests.post(
-                        f"http://localhost:{_port}/moto-api/reset-auth",
+                        f"{_test_server_mode_endpoint}/moto-api/reset-auth",
                         data=str(initial_no_auth_action_count).encode("utf-8"),
                     )
                     original_initial_no_auth_action_count = response.json()[
@@ -165,7 +165,7 @@ class ActionAuthenticatorMixin(object):
                 finally:
                     if settings.TEST_SERVER_MODE:
                         requests.post(
-                            f"http://localhost:{_port}/moto-api/reset-auth",
+                            f"{_test_server_mode_endpoint}/moto-api/reset-auth",
                             data=str(original_initial_no_auth_action_count).encode(
                                 "utf-8"
                             ),

moto/settings.py

@@ -70,6 +70,12 @@ def moto_network_mode():
     return os.environ.get("MOTO_DOCKER_NETWORK_MODE")
 
 
+def test_server_mode_endpoint():
+    return os.environ.get(
+        "TEST_SERVER_MODE_ENDPOINT", f"http://localhost:{moto_server_port()}"
+    )
+
+
 def is_docker():
     path = "/proc/self/cgroup"
     return (