Update parse_host and tests

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/client.py

@@ -14,7 +14,6 @@
 
 import json
 import struct
-import sys
 
 import requests
 import requests.exceptions
@@ -63,7 +62,9 @@ class Client(
 
         self._auth_configs = auth.load_config()
 
-        base_url = utils.parse_host(base_url, sys.platform, tls=bool(tls))
+        base_url = utils.parse_host(
+            base_url, constants.IS_WINDOWS_PLATFORM, tls=bool(tls)
+        )
         if base_url.startswith('http+unix://'):
             self._custom_adapter = UnixAdapter(base_url, timeout)
             self.mount('http+docker://', self._custom_adapter)

docker/utils/utils.py

@@ -383,13 +383,13 @@ def parse_repository_tag(repo_name):
 # fd:// protocol unsupported (for obvious reasons)
 # Added support for http and https
 # Protocol translation: tcp -> http, unix -> http+unix
-def parse_host(addr, platform=None, tls=False):
+def parse_host(addr, is_win32=False, tls=False):
     proto = "http+unix"
     host = DEFAULT_HTTP_HOST
     port = None
     path = ''
 
-    if not addr and platform == 'win32':
+    if not addr and is_win32:
         addr = '{0}:{1}'.format(DEFAULT_HTTP_HOST, 2375)
 
     if not addr or addr.strip() == 'unix://':

tests/unit/utils_test.py

@@ -388,6 +388,7 @@ class ParseHostTest(base.BaseTestCase):
             'somehost.net:80/service/swarm': (
                 'http://somehost.net:80/service/swarm'
             ),
+            'npipe:////./pipe/docker_engine': 'npipe:////./pipe/docker_engine',
         }
 
         for host in invalid_hosts:
@@ -402,10 +403,8 @@ class ParseHostTest(base.BaseTestCase):
         tcp_port = 'http://127.0.0.1:2375'
 
         for val in [None, '']:
-            for platform in ['darwin', 'linux2', None]:
-                assert parse_host(val, platform) == unix_socket
-
-            assert parse_host(val, 'win32') == tcp_port
+            assert parse_host(val, is_win32=False) == unix_socket
+            assert parse_host(val, is_win32=True) == tcp_port
 
     def test_parse_host_tls(self):
         host_value = 'myhost.docker.net:3348'