Merge pull request #50 from neo4j/1.0-stability-tests

Test server disconnect is detected

Author: Zhen Li

neo4j/v1/__init__.py

@@ -18,6 +18,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from .connection import ProtocolError
 from .constants import *
 from .session import *
 from .types import *

test/test_stability.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+
+# Copyright (c) 2002-2016 "Neo Technology,"
+# Network Engine for Objects in Lund AB [http://neotechnology.com]
+#
+# This file is part of Neo4j.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from neo4j.v1 import GraphDatabase, basic_auth, ProtocolError
+
+from test.util import ServerTestCase, restart_server
+
+
+auth_token = basic_auth("neo4j", "password")
+
+
+class ServerRestartTestCase(ServerTestCase):
+
+    def test_server_shutdown_detection(self):
+        driver = GraphDatabase.driver("bolt://localhost", auth=auth_token)
+        session = driver.session()
+        session.run("RETURN 1").consume()
+        assert restart_server()
+        with self.assertRaises(ProtocolError):
+            session.run("RETURN 1").consume()
+        session.close()

test/util.py

@@ -20,8 +20,11 @@
 
 
 import functools
-from os import remove, rename
+from os import getenv, remove, rename
 from os.path import isfile
+from socket import create_connection
+from subprocess import check_call, CalledProcessError
+from time import sleep
 from unittest import TestCase
 
 from neo4j.util import Watcher
@@ -48,6 +51,32 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 
+def restart_server(http_port=7474):
+    try:
+        check_call("%s/bin/neo4j restart" % getenv("NEO4J_HOME"), shell=True)
+    except CalledProcessError as error:
+        if error.returncode == 2:
+            raise OSError("Another process is listening on the server port")
+        elif error.returncode == 512:
+            raise OSError("Another server process is already running")
+        else:
+            raise OSError("An error occurred while trying to start "
+                          "the server [%s]" % error.returncode)
+    else:
+        running = False
+        t = 0
+        while not running and t < 30:
+            try:
+                s = create_connection(("localhost", http_port))
+            except IOError:
+                sleep(1)
+                t += 1
+            else:
+                s.close()
+                running = True
+        return running
+
+
 class ServerTestCase(TestCase):
     """ Base class for test cases that use a remote server.
     """