Determine preferable local address to connect through.

If listen contains '*' or 0.0.0.0 - connect via localhost
In all other cases pick the first one.

helpers/postgresql.py

@@ -57,8 +57,14 @@ class Postgresql:
         self.members = []  # list of already existing replication slots
 
     def get_local_address(self):
-        # TODO: try to get unix_socket_directory from postmaster.pid
-        return self.listen_addresses.split(',')[0].strip() + ':' + self.port
+        listen_addresses = self.listen_addresses.split(',')
+        local_address = listen_addresses[0].strip()  # take first address from listen_addresses
+
+        for la in listen_addresses:
+            if la.strip() in ['*', '0.0.0.0']:  # we are listening on *
+                local_address = 'localhost'  # connection via localhost is preferred
+                break
+        return local_address + ':' + self.port
 
     def connection(self):
         if not self._connection or self._connection.closed != 0:

tests/test_postgresql.py

@@ -91,7 +91,7 @@ class TestPostgresql(unittest.TestCase):
 
     def set_up(self):
         subprocess.call = subprocess_call
-        self.p = Postgresql({'name': 'test0', 'data_dir': 'data/test0', 'listen': '127.0.0.1, 127.0.0.2:5432',
+        self.p = Postgresql({'name': 'test0', 'data_dir': 'data/test0', 'listen': '127.0.0.1, *:5432',
                              'connect_address': '127.0.0.2:5432',
                              'pg_hba': [{'type': 'hostssl', 'database': 'all', 'user': 'all', 'address': '0.0.0.0/0',
                                          'method': 'md5'}, {'type': 'host', 'database': 'all', 'user': 'all',