pull the encoding attrs directly off a connection. fixes redis#455

Author: andymccurdy

redis/client.py

@@ -1887,10 +1887,13 @@ def __init__(self, connection_pool, shard_hint=None,
         self.connection = None
         # we need to know the encoding options for this connection in order
         # to lookup channel and pattern names for callback handlers.
-        connection_kwargs = self.connection_pool.connection_kwargs
-        self.encoding = connection_kwargs['encoding']
-        self.encoding_errors = connection_kwargs['encoding_errors']
-        self.decode_responses = connection_kwargs['decode_responses']
+        conn = connection_pool.get_connection('pubsub', shard_hint)
+        try:
+            self.encoding = conn.encoding
+            self.encoding_errors = conn.encoding_errors
+            self.decode_responses = conn.decode_responses
+        finally:
+            connection_pool.release(conn)
         self.reset()
 
     def __del__(self):