test: Randomize ports on each run

kedifa/test.py

@@ -35,6 +35,7 @@ import tempfile
 import time
 import unittest
 import zc.lockfile
+import socket
 
 from cryptography import x509
 from cryptography.hazmat.backends import default_backend
@@ -50,6 +51,15 @@ import cli
 import updater
 
 
+def findFreeTCPPort(ip=''):
+  """Find a free TCP port to listen to.
+  """
+  family = socket.AF_INET6 if ':' in ip else socket.AF_INET
+  with contextlib.closing(socket.socket(family, socket.SOCK_STREAM)) as s:
+    s.bind((ip, 0))
+    return str(s.getsockname()[1])
+
+
 @contextlib.contextmanager
 def captured_output():
   new_out, new_err = StringIO.StringIO(), StringIO.StringIO()
@@ -136,7 +146,8 @@ class KedifaMixinCaucase(KedifaMixin):
     self.pem = certificate_pem + key_pem
 
   def setUpCaucase(self):
-    ip, port = os.environ['SLAPOS_TEST_IPV6'], 15080
+    ip, port = os.environ['SLAPOS_TEST_IPV6'],\
+       findFreeTCPPort(os.environ['SLAPOS_TEST_IPV6'])
     self.caucased = os.path.join(self.testdir, 'caucased')
     caucase_db = os.path.join(self.caucased, 'caucase.sqlite')
     self.caucase_service = os.path.join(self.testdir, 'service')
@@ -215,7 +226,7 @@ class KedifaMixinCaucase(KedifaMixin):
   def setUpKedifa(self, ip):
     self.db = os.path.join(self.testdir, 'pocket.sqlite')
     self.pidfile = os.path.join(self.testdir, 'kedifa.pid')
-    port = '16080'
+    port = findFreeTCPPort(ip)
     self.kedifa_runtime = multiprocessing.Process(
       target=cli.http,
       args=(