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path: root/3rd_party/collectd-ves-app/ves_app/ves_app.py
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#!/usr/bin/env python
#
# 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 json
import sys
import base64
import logging
import argparse

try:
    import configparser
except ImportError:
    import ConfigParser as configparser

from distutils.util import strtobool
from kafka import KafkaConsumer

from normalizer import Normalizer
from normalizer import CollectdValue

try:
    # For Python 3.0 and later
    import urllib.request as url
except ImportError:
    # Fall back to Python 2's urllib2
    import urllib2 as url

class VESApp(Normalizer):
    """VES Application"""

    def __init__(self):
        """Application initialization"""
        self._app_config = {
            'Domain': '127.0.0.1',
            'Port': 30000,
            'Path': '',
            'Username': '',
            'Password': '',
            'Topic': '',
            'UseHttps': False,
            'SendEventInterval': 20.0,
            'ApiVersion': 5.1,
            'KafkaPort': 9092,
            'KafkaBroker': 'localhost'
        }

    def send_data(self, event):
        """Send event to VES"""
        server_url = "http{}://{}:{}{}/eventListener/v{}{}".format(
            's' if self._app_config['UseHttps'] else '',
            self._app_config['Domain'], int(self._app_config['Port']),
            '{}'.format('/{}'.format(self._app_config['Path']) if len(
                self._app_config['Path']) > 0 else ''),
            int(self._app_config['ApiVersion']), '{}'.format(
                '/{}'.format(self._app_config['Topic']) if len(
                    self._app_config['Topic']) > 0 else ''))
        logging.info('Vendor Event Listener is at: {}'.format(server_url))
        credentials = base64.b64encode('{}:{}'.format(
            self._app_config['Username'],
            self._app_config['Password']).encode()).decode()
        logging.info('Authentication credentials are: {}'.format(credentials))
        try:
            request = url.Request(server_url)
            request.add_header('Authorization', 'Basic {}'.format(credentials))
            request.add_header('Content-Type', 'application/json')
            event_str = json.dumps(event).encode()
            logging.debug("Sending {} to {}".format(event_str, server_url))
            url.urlopen(request, event_str, timeout=1)
            logging.debug("Sent data to {} successfully".format(server_url))
        except url.HTTPError as e:
            logging.error('Vendor Event Listener exception: {}'.format(e))
        except url.URLError as e:
            logging.error(
                'Vendor Event Listener is is not reachable: {}'.format(e))
        except Exception as e:
            logging.error('Vendor Event Listener error: {}'.format(e))

    def config(self, config):
        """VES option configuration"""
        for key, value in config.items('config'):
            if key in self._app_config:
                try:
                    if type(self._app_config[key]) == int:
                        value = int(value)
                    elif type(self._app_config[key]) == float:
                        value = float(value)
                    elif type(self._app_config[key]) == bool:
                        value = bool(strtobool(value))

                    if isinstance(value, type(self._app_config[key])):
                        self._app_config[key] = value
                    else:
                        logging.error("Type mismatch with %s" % key)
                        sys.exit()
                except ValueError:
                    logging.error("Incorrect value type for %s" % key)
                    sys.exit()
            else:
                logging.error("Incorrect key configuration %s" % key)
                sys.exit()

    def init(self, configfile, schema_file):
        if configfile is not None:
            # read VES configuration file if provided
            config = configparser.ConfigParser()
            config.optionxform = lambda option: option
            config.read(configfile)
            self.config(config)
        # initialize normalizer
        self.initialize(schema_file, self._app_config['SendEventInterval'])

    def run(self):
        """Consumer JSON data from kafka broker"""
        kafka_server = '{}:{}'.format(
            self._app_config.get('KafkaBroker'),
            self._app_config.get('KafkaPort'))
        consumer = KafkaConsumer(
            'collectd', bootstrap_servers=kafka_server,
            auto_offset_reset='latest', enable_auto_commit=False,
            value_deserializer=lambda m: json.loads(m.decode('ascii')))

        for message in consumer:
            for kafka_data in message.value:
                # {
                #   u'dstypes': [u'derive'],
                #   u'plugin': u'cpu',
                #   u'dsnames': [u'value'],
                #   u'interval': 10.0,
                #   u'host': u'localhost',
                #   u'values': [99.9978996416267],
                #   u'time': 1502114956.244,
                #   u'plugin_instance': u'44',
                #   u'type_instance': u'idle',
                #   u'type': u'cpu'
                # }
                logging.debug('{}:run():data={}'.format(
                    self.__class__.__name__, kafka_data))
                for ds_name in kafka_data['dsnames']:
                    index = kafka_data['dsnames'].index(ds_name)
                    val_hash = CollectdValue.hash_gen(
                        kafka_data['host'], kafka_data['plugin'],
                        kafka_data['plugin_instance'], kafka_data['type'],
                        kafka_data['type_instance'], ds_name)
                    collector = self.get_collector()
                    val = collector.get(val_hash)
                    if val:
                        # update the value
                        val.value = kafka_data['values'][index]
                        val.time = kafka_data['time']
                        del(val)
                    else:
                        # add new value into the collector
                        val = CollectdValue()
                        val.host = kafka_data['host']
                        val.plugin = kafka_data['plugin']
                        val.plugin_instance = kafka_data['plugin_instance']
                        val.type = kafka_data['type']
                        val.type_instance = kafka_data['type_instance']
                        val.value = kafka_data['values'][index]
                        val.interval = kafka_data['interval']
                        val.time = kafka_data['time']
                        val.ds_name = ds_name
                        collector.add(val)


def main():
    # Parsing cmdline options
    parser = argparse.ArgumentParser()
    parser.add_argument("--events-schema", dest="schema", required=True,
                        help="YAML events schema definition", metavar="FILE")
    parser.add_argument("--config", dest="configfile", default=None,
                        help="Specify config file", metavar="FILE")
    parser.add_argument("--loglevel", dest="level", default='INFO',
                        choices=['DEBUG', 'INFO', 'WARNING', 'ERROR'],
                        help="Specify log level (default: %(default)s)",
                        metavar="LEVEL")
    parser.add_argument("--logfile", dest="logfile", default='ves_app.log',
                        help="Specify log file (default: %(default)s)",
                        metavar="FILE")
    args = parser.parse_args()

    # Create log file
    logging.basicConfig(filename=args.logfile,
                        format='%(asctime)s %(message)s',
                        level=args.level)
    if args.configfile is None:
        logging.warning("No configfile specified, using default options")

    # Create Application Instance
    application_instance = VESApp()
    application_instance.init(args.configfile, args.schema)

    try:
        # Run the plugin
        application_instance.run()
    except KeyboardInterrupt:
        logging.info(" - Ctrl-C handled, exiting gracefully")
    except Exception as e:
        logging.error('{}, {}'.format(type(e), e))
    finally:
        application_instance.destroy()
        sys.exit()


if __name__ == '__main__':
    main()