#!/usr/bin/python -u
# Copyright (c) 2010-2012 OpenStack, LLC.
#
# 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.

import os
import shutil

from subprocess import call, Popen
from unittest import main, TestCase
from uuid import uuid4

from swiftclient import client

from swift.common import direct_client
from test.probe.common import kill_server, kill_servers, reset_environment,\
    start_server
from swift.common.utils import readconf


class TestEmptyDevice(TestCase):

    def setUp(self):
        (self.pids, self.port2server, self.account_ring, self.container_ring,
         self.object_ring, self.url, self.token,
         self.account) = reset_environment()

    def tearDown(self):
        kill_servers(self.port2server, self.pids)

    def _get_objects_dir(self, onode):
        device = onode['device']
        node_id = (onode['port'] - 6000) / 10
        obj_server_conf = readconf('/etc/swift/object-server/%s.conf' %
                                   node_id)
        devices = obj_server_conf['app:object-server']['devices']
        obj_dir = '%s/%s' % (devices, device)
        return obj_dir

    def test_main(self):
        # Create container
        # Kill one container/obj primary server
        # Delete the "objects" directory on the primary server
        # Create container/obj (goes to two primary servers and one handoff)
        # Kill other two container/obj primary servers
        # Indirectly through proxy assert we can get container/obj
        # Restart those other two container/obj primary servers
        # Directly to handoff server assert we can get container/obj
        # Assert container listing (via proxy and directly) has container/obj
        # Bring the first container/obj primary server back up
        # Assert that it doesn't have container/obj yet
        # Run object replication for first container/obj primary server
        # Run object replication for handoff node
        # Assert the first container/obj primary server now has container/obj
        # Assert the handoff server no longer has container/obj

        container = 'container-%s' % uuid4()
        client.put_container(self.url, self.token, container)

        cpart, cnodes = self.container_ring.get_nodes(self.account, container)
        cnode = cnodes[0]
        obj = 'object-%s' % uuid4()
        opart, onodes = self.object_ring.get_nodes(
            self.account, container, obj)
        onode = onodes[0]
        kill_server(onode['port'], self.port2server, self.pids)
        obj_dir = '%s/objects' % self._get_objects_dir(onode)
        shutil.rmtree(obj_dir, True)
        self.assertFalse(os.path.exists(obj_dir))
        client.put_object(self.url, self.token, container, obj, 'VERIFY')
        odata = client.get_object(self.url, self.token, container, obj)[-1]
        if odata != 'VERIFY':
            raise Exception('Object GET did not return VERIFY, instead it '
                            'returned: %s' % repr(odata))
        # Kill all primaries to ensure GET handoff works
        for node in onodes[1:]:
            kill_server(node['port'], self.port2server, self.pids)
        odata = client.get_object(self.url, self.token, container, obj)[-1]
        if odata != 'VERIFY':
            raise Exception('Object GET did not return VERIFY, instead it '
                            'returned: %s' % repr(odata))
        for node in onodes[1:]:
            start_server(node['port'], self.port2server, self.pids)
            self.assertFalse(os.path.exists(obj_dir))
            # We've indirectly verified the handoff node has the object, but
            # let's directly verify it.
        another_onode = self.object_ring.get_more_nodes(opart).next()
        odata = direct_client.direct_get_object(
            another_onode, opart, self.account, container, obj)[-1]
        if odata != 'VERIFY':
            raise Exception('Direct object GET did not return VERIFY, instead '
                            'it returned: %s' % repr(odata))
        objs = [o['name'] for o in
                client.get_container(self.url, self.token, container)[1]]
        if obj not in objs:
            raise Exception('Container listing did not know about object')
        for cnode in cnodes:
            objs = [o['name'] for o in
                    direct_client.direct_get_container(
                        cnode, cpart, self.account, container)[1]]
            if obj not in objs:
                raise Exception(
                    'Container server %s:%s did not know about object' %
                    (cnode['ip'], cnode['port']))
        start_server(onode['port'], self.port2server, self.pids)
        self.assertFalse(os.path.exists(obj_dir))
        exc = None
        try:
            direct_client.direct_get_object(onode, opart, self.account,
                                            container, obj)
        except direct_client.ClientException, err:
            exc = err
        self.assertEquals(exc.http_status, 404)
        self.assertFalse(os.path.exists(obj_dir))

        call(['swift-object-replicator',
              '/etc/swift/object-server/%d.conf' %
              ((onode['port'] - 6000) / 10), 'once'])
        call(['swift-object-replicator',
              '/etc/swift/object-server/%d.conf' %
              ((another_onode['port'] - 6000) / 10), 'once'])

        odata = direct_client.direct_get_object(onode, opart, self.account,
                                                container, obj)[-1]
        if odata != 'VERIFY':
            raise Exception('Direct object GET did not return VERIFY, instead '
                            'it returned: %s' % repr(odata))
        exc = None
        try:
            direct_client.direct_get_object(another_onode, opart, self.account,
                                            container, obj)
        except direct_client.ClientException, err:
            exc = err
        self.assertEquals(exc.http_status, 404)

if __name__ == '__main__':
    main()