refactor: move all docker client host detection to docker_client

also use utils for platform detection

core/testcontainers/core/container.py

@@ -1,5 +1,4 @@
 import contextlib
-from platform import system
 from socket import socket
 from typing import TYPE_CHECKING, Optional, Union
 
@@ -131,11 +130,6 @@ def __exit__(self, exc_type, exc_val, exc_tb) -> None:
     def get_container_host_ip(self) -> str:
         # infer from docker host
         host = self.get_docker_client().host()
-        if not host:
-            return "localhost"
-        # see https://github.com/testcontainers/testcontainers-python/issues/415
-        if host == "localnpipe" and system() == "Windows":
-            return "localhost"
 
         # # check testcontainers itself runs inside docker container
         # if inside_container() and not os.getenv("DOCKER_HOST") and not host.startswith("http://"):

core/testcontainers/core/docker_client.py

@@ -27,7 +27,7 @@
 from testcontainers.core.auth import DockerAuthInfo, parse_docker_auth_config
 from testcontainers.core.config import testcontainers_config as c
 from testcontainers.core.labels import SESSION_ID, create_labels
-from testcontainers.core.utils import default_gateway_ip, inside_container, setup_logger
+from testcontainers.core.utils import default_gateway_ip, inside_container, is_windows, setup_logger
 
 LOGGER = setup_logger(__name__)
 
@@ -196,10 +196,12 @@ def host(self) -> str:
             return host
         try:
             url = urllib.parse.urlparse(self.client.api.base_url)
-
         except ValueError:
             return "localhost"
-        if "http" in url.scheme or "tcp" in url.scheme:
+        if "http" in url.scheme or "tcp" in url.scheme and url.hostname:
+            # see https://github.com/testcontainers/testcontainers-python/issues/415
+            if host == "localnpipe" and is_windows():
+                return "localhost"
             return url.hostname
         if inside_container() and ("unix" in url.scheme or "npipe" in url.scheme):
             ip_address = default_gateway_ip()