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#!/usr/bin/env python
##############################################################################
# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################

import os
import argparse
import time
import logging
import urllib2
import shutil
from heatclient.client import Client as HeatClient
from keystoneclient.v2_0.client import Client as KeystoneClient
from glanceclient.v2.client import Client as GlanceClient
from novaclient.client import Client as NovaClient

#------------------------------------------------------
# parser for configuration files in each test case
# ------------------------------------------------------
parser = argparse.ArgumentParser()
parser.add_argument("-c", "--conf",
                    help="configuration files for the testcase, in yaml format",
                    default="/home/opnfv/bottlenecks/testsuites/vstf/testcase_cfg/vstf_Tu1.yaml")
args = parser.parse_args()

#--------------------------------------------------
# logging configuration
#--------------------------------------------------
logger = logging.getLogger(__name__)


def _get_keystone_client():
    keystone_client = KeystoneClient(
                auth_url=os.environ.get('OS_AUTH_URL'),
                username=os.environ.get('OS_USERNAME'),
                password=os.environ.get('OS_PASSWORD'),
                tenant_name=os.environ.get('OS_TENANT_NAME'),
                cacert=os.environ.get('OS_CACERT'))
    return keystone_client

def _get_heat_client():
    keystone = _get_keystone_client()
    heat_endpoint = keystone.service_catalog.url_for(service_type='orchestration')
    heat_client = HeatClient('1', endpoint=heat_endpoint, token=keystone.auth_token)
    return heat_client

def _get_glance_client():
    keystone = _get_keystone_client()
    glance_endpoint = keystone.service_catalog.url_for(service_type='image', endpoint_type='publicURL')
    return GlanceClient(glance_endpoint, token=keystone.auth_token)

def _get_nova_client():
    nova_client = NovaClient("2", os.environ.get('OS_USERNAME'),
                                  os.environ.get('OS_PASSWORD'),
                                  os.environ.get('OS_TENANT_NAME'),
                                  os.environ.get('OS_AUTH_URL'))
    return nova_client

def _download_url(src_url, dest_dir):
    ''' Download a file to a destination path given a URL'''
    file_name = src_url.rsplit('/')[-1]
    dest = dest_dir + "/" + file_name
    try:
        response = urllib2.urlopen(src_url)
    except (urllib2.HTTPError, urllib2.URLError):
        return None

    with open(dest, 'wb') as f:
        shutil.copyfileobj(response, f)
    return file_name

def vstf_stack_satisfy(name="bottlenecks_vstf_stack", status="CREATE_COMPLETE"):
    heat = _get_heat_client()
    for stack in heat.stacks.list():
        if status == None and stack.stack_name == name:
            # Found target stack
            print "Found stack, name=" + str(stack.stack_name)
            return True
        elif stack.stack_name == name and stack.stack_status==status:
            print "Found stack, name=" + str(stack.stack_name) + ", status=" + str(stack.stack_status)
            return True
    return False

def vstf_env_prepare(template=None):
    print "========== Prepare vstf environment =========="
    logger.info("env preparation for testcase.")

def vstf_env_cleanup():
    print "========== Cleanup vstf environment =========="
    glance = _get_glance_client()
    heat = _get_heat_client()
    nova = _get_nova_client()

    for image in glance.images.list():
        if image.name.find("bottlenecks_vstf") >= 0:
            print "Delete image, id:" + str(image.id) + ", name:" + str(image.name)
            glance.images.delete(image.id)

    for keypair in nova.keypairs.list():
        if keypair.name.find("bottlenecks_vstf") >= 0:
            print "Delete keypair, id:" + str(keypair.id) + ", name:" + str(keypair.name)
            nova.keypairs.delete(keypair.id)

    for flavor in nova.flavors.list():
        if flavor.name.find("bottlenecks_vstf") >= 0:
            print "Delete flavor, id:" + str(flavor.id) + ", name:" + str(flavor.name)
            nova.flavors.delete(flavor.id)

    for stack in heat.stacks.list():
        if stack.stack_name.find("bottlenecks_vstf") >= 0:
            print "Delete stack, id: " + str(stack.id) + ", name:" + str(stack.stack_name)
            heat.stacks.delete(stack.id)

    timeInProgress = 0
    while vstf_stack_satisfy(name="bottlenecks_vstf_stack", status=None) and timeInProgress < 60:
        time.sleep(5)
        timeInProgress = timeInProgress + 5

    if vstf_stack_satisfy(name="bottlenecks_vstf_stack", status=None) == True:
        print "Failed to clean the stack"
        return False
    else:
        return True

def vstf_create_images(src_url=None, image_name="bottlenecks_vstf_image"):
    print "========== Create vstf image in OS =========="
    dest_dir = '/tmp'
    file_name = _download_url(src_url, dest_dir)
    if file_name == None:
       return False

    glance = _get_glance_client()
    imagefile = dest_dir + "/" + file_name
    image = glance.images.create(name=image_name, disk_format="qcow2", container_format="bare")
    with open(imagefile) as fimage:
        glance.images.upload(image.id, fimage)

    timeInQueue = 0
    img_status = image.status
    while img_status == "queued" and timeInQueue < 30:
        print "  image's status: " + img_status
        time.sleep(1)
        timeInQueue = timeInQueue + 1
        img_status = glance.images.get(image.id).status

    print "After %d seconds, the image's status is [%s]" %(timeInQueue, img_status)
    return True if img_status == "active" else False

def vstf_create_keypairs(key_path, name="bottlenecks_vstf_keypair"):
    print "========== Add vstf keypairs in OS =========="
    nova = _get_nova_client()
    with open(key_path) as pkey:
        nova.keypairs.create(name=name, public_key=pkey.read())

def vstf_create_flavors(name="bottlenecks_vstf_flavor", ram=4096, vcpus=2, disk=10):
    print "========== Create vstf flavors in OS =========="
    nova = _get_nova_client()
    nova.flavors.create(name=name, ram=ram, vcpus=vcpus, disk=disk)

def vstf_create_instances(template_file, vstf_parameters=None, stack_name="bottlenecks_vstf_stack"):
    print "========== Create vstf instances =========="
    heat = _get_heat_client()

    with open(template_file) as template:
        stack = heat.stacks.create(stack_name=stack_name, template=template.read(), parameters=vstf_parameters)

    stack_id = stack['stack']['id']
    stack_status = heat.stacks.get(stack_id).stack_status

    print "Created stack, id=" + str(stack_id) + ", status=" + str(stack_status)

    timeInProgress= 0
    while stack_status == "CREATE_IN_PROGRESS" and timeInProgress < 150:
        print "  stack's status: %s, after %d seconds" %(stack_status, timeInProgress)
        time.sleep(5)
        timeInProgress = timeInProgress + 5
        stack_status = heat.stacks.get(stack_id).stack_status

    print "After %d seconds, the stack's status is [%s]" %(timeInProgress, stack_status)
    return True if stack_status == "CREATE_COMPLETE" else False

def get_instances(nova_client):
    try:
        instances = nova_client.servers.list(search_opts={'all_tenants': 1})
        return instances
    except Exception, e:
        print "Error [get_instances(nova_client)]:", e
        return None

def vstf_run():
    print "================run vstf==============="

    nova = _get_nova_client()
    print(nova.servers.list())
    instances = get_instances(nova)
    if instances == None:
        print "Found *None* instances, exit vstf_run()!"
        return False

def main():

    Bottlenecks_repo_dir = "/home/opnfv/bottlenecks"      # same in Dockerfile, docker directory
    Heat_template = Bottlenecks_repo_dir + "/testsuites/vstf/testcase_cfg/vstf_heat_template.yaml"
    manager_image_url = 'http://artifacts.opnfv.org/bottlenecks/vstf-manager-new.img'
    agent_image_url = 'http://artifacts.opnfv.org/bottlenecks/vstf-agent-new.img'

    #TO DO:the parameters are all used defaults here, it should be changed depends on what it is really named
    parameters={'key_name': 'bottlenecks_vstf_keypair',
                'flavor': 'bottlenecks_vstf_flavor',
                'public_net': os.environ.get('EXTERNAL_NET')}

    print "Heat_template_file: " + Heat_template
    print "parameters:\n" + str(parameters)

    if not (args.conf):
       logger.error("Configuration files are not set for testcase")
       exit(-1)
    else:
       testcase_cfg = args.conf

    manager_image_created = False
    tester_image_created = False
    target_image_created = False
    stack_created = False

    #vstf_env_prepare(testcase_cfg)
    vstf_env_cleanup()

    manager_image_created = vstf_create_images(src_url=manager_image_url, image_name="vstf-manager")
    tester_image_created = vstf_create_images(src_url=agent_image_url, image_name="vstf-tester")
    target_image_created = vstf_create_images(src_url=agent_image_url, image_name="vstf-target")
    keyPath = Bottlenecks_repo_dir + "/utils/infra_setup/bottlenecks_key/bottlenecks_key.pub"
    vstf_create_keypairs(key_path=keyPath)
    vstf_create_flavors()

    if manager_image_created == True and tester_image_created == True and target_image_created == True:
        stack_created = vstf_create_instances(template_file=Heat_template, vstf_parameters=parameters, stack_name="bottlenecks_vstf_stack")
    else:
        print "Cannot create instances, as Failed to create image(s)."
        exit (-1)

    print "Wait 100 seconds after stack creation..."
    time.sleep(100)

    vstf_run()

    vstf_env_cleanup()

if __name__=='__main__':
    main()