#!/usr/bin/python -u
# Copyright (c) 2010-2012 OpenStack Foundation
#
# 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
import time

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

from swiftclient import client

from swift.common import direct_client
from swift.common.exceptions import ClientException
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, self.configs) = 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(self.configs['object'] % 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')
        timeout = time.time() + 5
        found_objs_on_cnode = []
        while time.time() < timeout:
            for cnode in [c for c in cnodes if cnodes not in
                          found_objs_on_cnode]:
                objs = [o['name'] for o in
                        direct_client.direct_get_container(
                            cnode, cpart, self.account, container)[1]]
                if obj in objs:
                    found_objs_on_cnode.append(cnode)
            if len(found_objs_on_cnode) >= len(cnodes):
                break
            time.sleep(0.3)
        if len(found_objs_on_cnode) < len(cnodes):
            missing = ['%s:%s' % (cnode['ip'], cnode['port']) for cnode in
                       cnodes if cnode not in found_objs_on_cnode]
            raise Exception('Container servers %r did not know about object' %
                            missing)
        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 ClientException as err:
            exc = err
        self.assertEquals(exc.http_status, 404)
        self.assertFalse(os.path.exists(obj_dir))

        try:
            port_num = onode['replication_port']
        except KeyError:
            port_num = onode['port']
        try:
            another_port_num = another_onode['replication_port']
        except KeyError:
            another_port_num = another_onode['port']
        call(['swift-object-replicator',
              self.configs['object-replicator'] %
              ((port_num - 6000) / 10), 'once'])
        call(['swift-object-replicator',
              self.configs['object-replicator'] %
              ((another_port_num - 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 ClientException as err:
            exc = err
        self.assertEquals(exc.http_status, 404)

if __name__ == '__main__':
    main()
