Move read_loop() into docker.utils.socket.read_iter()

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

docker/client.py

@@ -32,7 +32,7 @@ from .ssladapter import ssladapter
 from .tls import TLSConfig
 from .transport import UnixAdapter
 from .utils import utils, check_resource, update_headers, kwargs_from_env
-from .utils.socket import read_socket, next_packet_size
+from .utils.socket import read_socket, next_packet_size, read_iter
 try:
     from .transport import NpipeAdapter
 except ImportError:
@@ -310,20 +310,12 @@ class Client(
             yield out
 
     def _read_from_socket(self, response, stream):
-        def read_loop(socket):
-            n = next_packet_size(socket)
-            while n > 0:
-                yield read_socket(socket, n)
-                n = next_packet_size(socket)
-
         socket = self._get_raw_response_socket(response)
+
         if stream:
-            return read_loop(socket)
+            return read_iter(socket)
         else:
-            data = six.binary_type()
-            for d in read_loop(socket):
-                data += d
-            return data
+            return six.binary_type().join(read_iter(socket))
 
     def _disable_socket_timeout(self, socket):
         """ Depending on the combination of python version and whether we're

docker/utils/socket.py

@@ -47,3 +47,10 @@ def read_data(socket, packet_size):
             assert False, "Failed trying to read in the data"
         data += next_data
     return data
+
+
+def read_iter(socket):
+    n = next_packet_size(socket)
+    while n > 0:
+        yield read_socket(socket, n)
+        n = next_packet_size(socket)