From 01f2ad7170df31ac9d610208f0444a376ff72dee Mon Sep 17 00:00:00 2001
From: Filipp Ozinov <filipp@bakanov.su>
Date: Mon, 7 Sep 2020 23:32:20 +0300
Subject: [PATCH] Fixed dns resolver bug after reboot, #119

---
 pysyncobj/dns_resolver.py | 2 +-
 test_syncobj.py           | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/pysyncobj/dns_resolver.py b/pysyncobj/dns_resolver.py
index 13fe7ea..0f864fc 100644
--- a/pysyncobj/dns_resolver.py
+++ b/pysyncobj/dns_resolver.py
@@ -18,7 +18,7 @@ def setTimeouts(self, cacheTime, failCacheTime):
 
     def resolve(self, hostname):
         currTime = monotonicTime()
-        cachedTime, ips = self.__cache.get(hostname, (0, []))
+        cachedTime, ips = self.__cache.get(hostname, (-self.__failCacheTime-1, []))
         timePassed = currTime - cachedTime
         if (timePassed > self.__cacheTime) or (not ips and timePassed > self.__failCacheTime):
             prevIps = ips
diff --git a/test_syncobj.py b/test_syncobj.py
index 6939724..5889554 100755
--- a/test_syncobj.py
+++ b/test_syncobj.py
@@ -6,6 +6,7 @@
 import threading
 import sys
 import pysyncobj.pickle as pickle
+import pysyncobj.dns_resolver as dns_resolver
 
 if sys.version_info >= (3, 0):
     xrange = range
@@ -2006,3 +2007,10 @@ def test_zeroDeployVersions():
     assert 'someMethod' not in o1._methodToID
     assert 'thirdMethod' not in o1._methodToID
     assert 'lastMethod' not in o1._methodToID
+
+
+def test_dnsResolverBug(monkeypatch):
+    monkeypatch.setattr(dns_resolver, "monotonicTime", lambda: 0.0)
+    resolver = dns_resolver.DnsCachingResolver(600, 30)
+    ip = resolver.resolve('localhost')
+    assert ip == '127.0.0.1'