##############################################################################
# Copyright (c) 2015 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 json
import logging
import requests

from oslo_config import cfg

from yardstick.dispatcher.base import Base as DispatchBase

LOG = logging.getLogger(__name__)

CONF = cfg.CONF
http_dispatcher_opts = [
    cfg.StrOpt('target',
               default='http://127.0.0.1:8000/results',
               help='The target where the http request will be sent. '
                    'If this is not set, no data will be posted. For '
                    'example: target = http://hostname:1234/path'),
    cfg.IntOpt('timeout',
               default=5,
               help='The max time in seconds to wait for a request to '
                    'timeout.'),
]

CONF.register_opts(http_dispatcher_opts, group="dispatcher_http")


class HttpDispatcher(DispatchBase):
    """Dispatcher class for posting data into a http target.
    """

    __dispatcher_type__ = "Http"

    def __init__(self, conf):
        super(HttpDispatcher, self).__init__(conf)
        self.headers = {'Content-type': 'application/json'}
        self.timeout = CONF.dispatcher_http.timeout
        self.target = CONF.dispatcher_http.target

    def record_result_data(self, data):
        if self.target == '':
            # if the target was not set, do not do anything
            LOG.error('Dispatcher target was not set, no data will'
                      'be posted.')
            return

        # We may have receive only one counter on the wire
        if not isinstance(data, list):
            data = [data]

        for result in data:
            try:
                LOG.debug('Message : %s' % result)
                res = requests.post(self.target,
                                    data=json.dumps(result),
                                    headers=self.headers,
                                    timeout=self.timeout)
                LOG.debug('Message posting finished with status code'
                          '%d.' % res.status_code)
            except Exception as err:
                LOG.exception('Failed to record result data: %s',
                              err)