#!/usr/bin/env python
# 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 logging
import os
import sys
import signal
import uuid
from optparse import OptionParser

from swift.common.bench import (BenchController, DistributedBenchController,
                                create_containers, delete_containers)
from swift.common.utils import readconf, LogAdapter

# The defaults should be sufficient to run swift-bench on a SAIO
CONF_DEFAULTS = {
    'auth': os.environ.get('ST_AUTH', ''),
    'user': os.environ.get('ST_USER', ''),
    'key': os.environ.get('ST_KEY', ''),
    'auth_version': '1.0',
    'use_proxy': 'yes',
    'put_concurrency': '10',
    'get_concurrency': '10',
    'del_concurrency': '10',
    'concurrency': '',  # set all 3 in one shot
    'object_sources': '',  # set of file contents to read and use for PUTs
    'lower_object_size': '10',  # bounded random size used if these differ
    'upper_object_size': '10',
    'object_size': '1',  # only if not object_sources and lower == upper
    'num_objects': '1000',
    'num_gets': '10000',
    'delete': 'yes',
    'container_name': uuid.uuid4().hex,  # really "container name base"
    'num_containers': '20',
    'url': '',  # used when use_proxy = no or overrides auth X-Storage-Url
    'account': '',  # used when use_proxy = no
    'devices': 'sdb1',  # space-sep list
    'log_level': 'INFO',
    'timeout': '10',
    'auth_version': '1.0',
    'bench_clients': [],
}

SAIO_DEFAULTS = {
    'auth': 'http://localhost:8080/auth/v1.0',
    'user': 'test:tester',
    'key': 'testing',
}

if __name__ == '__main__':
    usage = "usage: %prog [OPTIONS] [CONF_FILE]"
    usage += """\n\nConf file with SAIO defaults:

    [bench]
    auth = http://localhost:8080/auth/v1.0
    user = test:tester
    key = testing
    concurrency = 10
    object_size = 1
    num_objects = 1000
    num_gets = 10000
    delete = yes
    auth_version = 1.0
    """
    parser = OptionParser(usage=usage)
    parser.add_option('', '--saio', dest='saio', action='store_true',
                      default=False, help='Run benchmark with SAIO defaults')
    parser.add_option('-A', '--auth', dest='auth',
                      help='URL for obtaining an auth token')
    parser.add_option('-U', '--user', dest='user',
                      help='User name for obtaining an auth token')
    parser.add_option('-K', '--key', dest='key',
                      help='Key for obtaining an auth token')
    parser.add_option('-b', '--bench-clients', action='append',
                      metavar='<ip>:<port>',
                      help=('A string of the form "<ip>:<port>" which matches '
                            'the arguments supplied to a swift-bench-client '
                            'process.  This argument must be specified '
                            'once per swift-bench-client you want to '
                            'utilize.'))
    parser.add_option('-u', '--url', dest='url',
                      help='Storage URL')
    parser.add_option('-c', '--concurrency', dest='concurrency',
                      help='Number of concurrent connections to use')
    parser.add_option('-s', '--object-size', dest='object_size',
                      help='Size of objects to PUT (in bytes)')
    parser.add_option('-l', '--lower-object-size', dest='lower_object_size',
                      help=('Lower size of objects (in bytes); '
                            '--object-size will be upper-object-size'))
    parser.add_option('-n', '--num-objects', dest='num_objects',
                      help='Number of objects to PUT')
    parser.add_option('-g', '--num-gets', dest='num_gets',
                      help='Number of GET operations to perform')
    parser.add_option('-x', '--no-delete', dest='delete', action='store_false',
                      help='If set, will not delete the objects created')
    parser.add_option('-V', '--auth_version', dest='auth_version',
                      help='Authentication version')

    if len(sys.argv) == 1:
        parser.print_help()
        sys.exit(1)
    options, args = parser.parse_args()
    if options.saio:
        CONF_DEFAULTS.update(SAIO_DEFAULTS)
    if getattr(options, 'lower_object_size', None):
        if options.object_size <= options.lower_object_size:
            raise ValueError('--lower-object-size (%s) must be '
                             '< --object-size (%s)' %
                             (options.lower_object_size, options.object_size))
        CONF_DEFAULTS['upper_object_size'] = options.object_size
    if args:
        conf = args[0]
        if not os.path.exists(conf):
            sys.exit("No such conf file: %s" % conf)
        conf = readconf(conf, 'bench', log_name='swift-bench',
                        defaults=CONF_DEFAULTS)
    else:
        conf = CONF_DEFAULTS
    parser.set_defaults(**conf)
    options, _junk = parser.parse_args()
    if options.concurrency is not '':
        options.put_concurrency = options.concurrency
        options.get_concurrency = options.concurrency
        options.del_concurrency = options.concurrency
    options.containers = ['%s_%d' % (options.container_name, i)
                          for i in xrange(int(options.num_containers))]

    def sigterm(signum, frame):
        sys.exit('Termination signal received.')
    signal.signal(signal.SIGTERM, sigterm)

    logger = logging.getLogger()
    logger.setLevel({
        'debug': logging.DEBUG,
        'info': logging.INFO,
        'warning': logging.WARNING,
        'error': logging.ERROR,
        'critical': logging.CRITICAL}.get(
            options.log_level.lower(), logging.INFO))
    loghandler = logging.StreamHandler()
    logger.addHandler(loghandler)
    logger = LogAdapter(logger, 'swift-bench')
    logformat = logging.Formatter('%(server)s %(asctime)s %(levelname)s '
                                  '%(message)s')
    loghandler.setFormatter(logformat)

    if options.use_proxy:
        create_containers(logger, options)

    controller_class = DistributedBenchController if options.bench_clients \
        else BenchController
    controller = controller_class(logger, options)
    controller.run()

    if options.delete:
        delete_containers(logger, options)
