Accept '*:<port>' for postgresql.listen (zalando#2398)

We catch this special value when validating configuration and check that
it's alone in the hosts list.

Fixes zalando#2397.

patroni/validator.py

@@ -37,6 +37,10 @@ def validate_host_port(host_port, listen=False, multiple_hosts=False):
             hosts = hosts.split(",")
         else:
             hosts = [hosts]
+        if "*" in hosts:
+            if len(hosts) != 1:
+                raise ConfigParseError("expecting '*' alone")
+            hosts = [p[-1][0] for p in socket.getaddrinfo(None, port, 0, socket.SOCK_STREAM, 0, socket.AI_PASSIVE)]
         for host in hosts:
             proto = socket.getaddrinfo(host, "", 0, socket.SOCK_STREAM, 0, socket.AI_PASSIVE)
             s = socket.socket(proto[0][0], socket.SOCK_STREAM)

tests/test_validator.py

@@ -156,6 +156,7 @@ def test_bin_dir_is_file(self, mock_out, mock_err):
         files.append(config["postgresql"]["bin_dir"])
         c = copy.deepcopy(config)
         c["restapi"]["connect_address"] = 'False:blabla'
+        c["postgresql"]["listen"] = '*:543'
         c["etcd"]["hosts"] = ["127.0.0.1:2379", "1244.0.0.1:2379", "127.0.0.1:invalidport"]
         c["kubernetes"]["pod_ip"] = "127.0.0.1111"
         errors = schema(c)
@@ -208,11 +209,12 @@ def test_pg_version_missmatch(self, mock_out, mock_err):
         files.append(os.path.join(config["postgresql"]["data_dir"], "PG_VERSION"))
         c = copy.deepcopy(config)
         c["etcd"]["hosts"] = []
+        c["postgresql"]["listen"] = '127.0.0.2,*:543'
         del c["postgresql"]["bin_dir"]
         with patch('patroni.validator.open', mock_open(read_data='11')):
             errors = schema(c)
         output = "\n".join(errors)
-        self.assertEqual(['etcd.hosts', 'postgresql.data_dir',
+        self.assertEqual(['etcd.hosts', 'postgresql.data_dir', 'postgresql.listen',
                           'raft.bind_addr', 'raft.self_addr'], parse_output(output))
 
     @patch('subprocess.check_output', Mock(return_value=b"postgres (PostgreSQL) 12.1"))