#!/usr/bin/python

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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,
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import os
import time
import logging
from blockadeUtils.blockade import Blockade
from clusterUtils.cluster_utils import ClusterUtils


logger = logging.getLogger(__name__)
parent_dir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
FILE = os.path.join(parent_dir, "compose", "ozoneblockade",
                    "docker-compose.yaml")
os.environ["DOCKER_COMPOSE_FILE"] = FILE
SCALE = 3
CONTAINER_LIST = []
OM = []
SCM = []
DATANODES = []


def setup():
    global CONTAINER_LIST, OM, SCM, DATANODES
    Blockade.blockade_destroy()
    CONTAINER_LIST = ClusterUtils.cluster_setup(FILE, SCALE)
    exit_code, output = Blockade.blockade_status()
    assert exit_code == 0, "blockade status command failed with output=[%s]" % \
                           output
    OM = filter(lambda x: 'ozoneManager' in x, CONTAINER_LIST)
    SCM = filter(lambda x: 'scm' in x, CONTAINER_LIST)
    DATANODES = sorted(list(filter(lambda x: 'datanode' in x, CONTAINER_LIST)))

    exit_code, output = ClusterUtils.run_freon(FILE, 1, 1, 1, 10240, "RATIS",
                                               "THREE")
    assert exit_code == 0, "freon run failed with output=[%s]" % output


def teardown():
    logger.info("Inside teardown")
    Blockade.blockade_destroy()


def teardown_module():
    ClusterUtils.cluster_destroy(FILE)


def test_datanode_isolation_one_node():
    """
    In this test, one of the datanodes (first datanode) cannot communicate
    with other two datanodes.
    All datanodes can communicate with SCM.
    Expectation :
    The container replica state in first datanode should be quasi-closed.
    The container replica state in other datanodes should be closed.
    """
    first_set = [OM[0], SCM[0], DATANODES[0]]
    second_set = [OM[0], SCM[0], DATANODES[1], DATANODES[2]]
    Blockade.blockade_create_partition(first_set, second_set)
    Blockade.blockade_status()
    ClusterUtils.run_freon(FILE, 1, 1, 1, 10240, "RATIS", "THREE")
    logger.info("Waiting for %s seconds before checking container status",
                os.environ["CONTAINER_STATUS_SLEEP"])
    time.sleep(int(os.environ["CONTAINER_STATUS_SLEEP"]))
    all_datanodes_container_status = \
        ClusterUtils.find_all_datanodes_container_status(FILE, SCALE)
    first_datanode_status = all_datanodes_container_status[0]
    count_closed_container_datanodes = filter(lambda x: x == 'CLOSED',
                                              all_datanodes_container_status)
    assert first_datanode_status == 'QUASI_CLOSED'
    assert len(count_closed_container_datanodes) == 2, \
        "The container should have three closed replicas."


def test_datanode_isolation_all():
    """
    In this test, none of the datanodes can communicate with other two
    datanodes.
    All datanodes can communicate with SCM.
    Expectation : The container should eventually have at least two closed
    replicas.
    """
    first_set = [OM[0], SCM[0], DATANODES[0]]
    second_set = [OM[0], SCM[0], DATANODES[1]]
    third_set = [OM[0], SCM[0], DATANODES[2]]
    Blockade.blockade_create_partition(first_set, second_set, third_set)
    Blockade.blockade_status()
    ClusterUtils.run_freon(FILE, 1, 1, 1, 10240, "RATIS", "THREE")
    logger.info("Waiting for %s seconds before checking container status",
                os.environ["CONTAINER_STATUS_SLEEP"])
    time.sleep(int(os.environ["CONTAINER_STATUS_SLEEP"]))
    all_datanodes_container_status = \
        ClusterUtils.find_all_datanodes_container_status(FILE, SCALE)
    count_closed_container_datanodes = filter(lambda x: x == 'CLOSED',
                                              all_datanodes_container_status)
    assert len(count_closed_container_datanodes) >= 2, \
        "The container should have at least two closed replicas."