From f61bb5f9385a9fd177ea5cceefdec7af2410e756 Mon Sep 17 00:00:00 2001
From: "Victor J. Orlikowski" <vjo@duke.edu>
Date: Tue, 19 Apr 2016 19:28:03 -0400
Subject: [PATCH] Eventlet throws a subclass of IOError when an SSL read
 timeout occurs. Ensure that the read loop continues in this case.

Signed-off-by: Victor J. Orlikowski <vjo@duke.edu>
Tested-by: Andy Hill <hillad@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 ryu/controller/controller.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ryu/controller/controller.py b/ryu/controller/controller.py
index 08304d21..1ae72876 100644
--- a/ryu/controller/controller.py
+++ b/ryu/controller/controller.py
@@ -194,6 +194,10 @@ class Datapath(ofproto_protocol.ProtocolDesc):
                 ret = self.socket.recv(required_len)
             except SocketTimeout:
                 continue
+            except ssl.SSLError:
+                # eventlet throws SSLError (which is a subclass of IOError)
+                # on SSL socket read timeout; re-try the loop in this case.
+                continue
             except (EOFError, IOError):
                 break