Use nonblocking sockets instead of selectors for healthy connections

This replaces the work in 3.2.0 to use nonblocking sockets instead of
selectors. Selectors proved to be problematic for some environments
including eventlet and gevent. Nonblocking sockets should be available
in all environments.

1 files changed, 3 insertions, 1 deletions

diff --git a/redis/_compat.py b/redis/_compat.py
index bde6fb6..d70af2a 100644
--- a/redis/_compat.py
+++ b/redis/_compat.py
@@ -1,12 +1,12 @@
 """Internal module for Python 2 backwards compatibility."""
 import errno
+import socket
 import sys
 
 # For Python older than 3.5, retry EINTR.
 if sys.version_info[0] < 3 or (sys.version_info[0] == 3 and
                                sys.version_info[1] < 5):
     # Adapted from https://bugs.python.org/review/23863/patch/14532/54418
-    import socket
     import time
 
     # Wrapper for handling interruptable system calls.
@@ -100,6 +100,7 @@ if sys.version_info[0] < 3:
     basestring = basestring
     unicode = unicode
     long = long
+    BlockingIOError = socket.error
 else:
     from urllib.parse import parse_qs, unquote, urlparse
     from string import ascii_letters
@@ -129,6 +130,7 @@ else:
     unicode = str
     safe_unicode = str
     long = int
+    BlockingIOError = BlockingIOError
 
 try:  # Python 3
     from queue import LifoQueue, Empty, Full