implement Happy Eyeballs

This allows OfflineIMAP to not stall on malfunctional IPv6 connections,
and fall-back to a functional IPv4 connection, if faster, as described
in RFC6555.

Signed-off-by: Olivier Mehani <shtrom@ssji.net>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This commit is contained in:
Olivier Mehani 2019-06-10 21:47:37 +10:00 committed by Nicolas Sebrecht
parent 06ed00a211
commit 0d5496ba0a
2 changed files with 10 additions and 1 deletions

View File

@ -19,6 +19,7 @@ import fcntl
import time
import subprocess
import threading
import rfc6555
import socket
import errno
import zlib
@ -78,8 +79,15 @@ class UsefulIMAPMixIn(object):
def open_socket(self):
"""open_socket()
Open socket choosing first address family available."""
if self.af == socket.AF_UNSPEC:
# happy-eyeballs!
return rfc6555.create_connection((self.host, self.port))
else:
return self._open_socket_for_af(self.af)
def _open_socket_for_af(self, af):
msg = (-1, 'could not open socket')
for res in socket.getaddrinfo(self.host, self.port, self.af, socket.SOCK_STREAM):
for res in socket.getaddrinfo(self.host, self.port, af, socket.SOCK_STREAM):
af, socktype, proto, canonname, sa = res
try:
# use socket of our own, possiblly socksified socket.

View File

@ -2,3 +2,4 @@
six
gssapi[kerberos]
portalocker[cygwin]
rfc6555