BATCAVE/batcave.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

from __future__ import print_function
import argparse
import daemon
import logging
import sys
import time
import threading

from ffstatus import \
    merge_alfred_batman, \
    ApiServer, \
    AlfredParser, BatmanParser, \
    DashingClient, GraphitePush, \
    FileStorage
from ffstatus.exceptions import SanityCheckError

BATCAVE = 'Batman/Alfred Transmission Collection, Aggregation & Value Engine'
DEFAULT_INTERVAL = 15


def get_args():
    """Parse commandline arguments."""

    parser = argparse.ArgumentParser(description=BATCAVE)
    parser.add_argument('--logfile',
                        help='path for log file')
    parser.add_argument('--interval', type=int, default=DEFAULT_INTERVAL,
                        help='data poll interval')
    parser.add_argument('-v', '--verbose', action='store_true',
                        help='increase output verbosity')
    parser.add_argument('-d', '--no-detach', action='store_true',
                        help='Don\'t detach (daemonize) ourself')
    parser.add_argument('-n', '--no-send', action='store_true',
                        help='Fetch data but don\'t send it')
    parser.add_argument('-A', '--alfred-json',
                        help='executable path for alfred-json')
    parser.add_argument('-B', '--batadv-vis',
                        help='executable path for batadv-vis')
    parser.add_argument('-G', '--graphite-host',
                        help='Graphite host')
    parser.add_argument('--graphite-port', type=int, default=2003,
                        help='Graphite port')
    parser.add_argument('--dashing-url',
                        help='Dashing URL')
    parser.add_argument('--dashing-token',
                        help='Dashing\'s secret update token')
    parser.add_argument('--api-bind-host', default='',
                        help='API-Server Hostname')
    parser.add_argument('--api-bind-port', type=int, default=8888,
                        help='API-Server Port')
    parser.add_argument('-S', '--storage-dir', default='.',
                        help='Path where to store data')
    return parser.parse_args()


def prepare_logging(args):
    """Configures Python's logging according to args."""

    logger = logging.getLogger()
    logger.setLevel(logging.DEBUG if args.verbose else logging.INFO)

    fmt = logging.Formatter(
        '%(asctime)s [%(levelname)s] %(message)s',
        '%Y-%m-%d %H:%M:%S')

    if not args.logfile is None:
        file_handler = logging.FileHandler(args.logfile)
        file_handler.setFormatter(fmt)
        logger.addHandler(file_handler)

    if args.no_detach:
        console_handler = logging.StreamHandler(sys.stdout)
        console_handler.setFormatter(fmt)
        logger.addHandler(console_handler)

    return logger


def main():
    args = get_args()
    if args.interval < 5:
        print('A poll interval lower than 5s is not supported.')
        sys.exit(1)

    shall_daemonize = not args.no_detach

    logger = prepare_logging(args)
    logger.info('Starting up')

    storage = FileStorage(args.storage_dir)
    storage.open()
    logger.info('Storage: ' + str(storage))

    alfred = AlfredParser()
    batman = BatmanParser()

    dashing = None
    if args.dashing_url is not None:
        dashing = DashingClient(args.dashing_url, args.dashing_token)

    graphite = None
    if args.graphite_host is not None:
        graphite = GraphitePush(args.graphite_host, args.graphite_port)

    if args.no_send:
        if graphite is not None:
            graphite.dont_send = True

    if not args.alfred_json is None:
        alfred.alfred_json = args.alfred_json
    if not args.batadv_vis is None:
        batman.batadv_vis = args.batadv_vis

    logger.debug('Configured A.L.F.R.E.D. source: %s', alfred)
    logger.debug('Configured B.A.T.M.A.N. source: %s', batman)
    logger.debug('Configured Dashing: %s', dashing)
    logger.debug('Configured Graphite: %s', graphite)

    # execute sanitycheck() where possible
    for i in [('AlfredParser', alfred), ('BatmanParser', batman)]:
        try:
            i[1].sanitycheck()
        except SanityCheckError as err:
            logger.critical(i[0] + '.sanitycheck() failed: ' + str(err))
            print('FAILED SANITY CHECK: ' + str(err))
            sys.exit(1)

    server = ApiServer((args.api_bind_host, args.api_bind_port), storage)
    server_thread = threading.Thread(target=server.serve_forever)
    server_thread.daemon = True  # exit thread when main thread terminates
    server_thread.start()
    logger.info('Started server: ' + str(server))

    if shall_daemonize:
        streams = [handler.stream for handler in logger.handlers
                   if isinstance(handler, logging.FileHandler)]
        daemon_context = daemon.DaemonContext(
            files_preserve=streams,
        )
        daemon_context.open()

    while True:
        try:
            now = int(time.time())
            logger.debug('Step 1/3: Fetching data ...')
            alfreddata = alfred.fetch()
            batmandata = batman.fetch()
            newdata = merge_alfred_batman(alfreddata, batmandata)
            logger.debug(
                'Fetched data: %d ALFRED with %d BATMAN makes %d total',
                len(alfreddata), len(batmandata), len(newdata))

            logger.debug('Step 2/3: Pushing update data ...')
            if graphite is not None:
                graphitedata = graphite.push(newdata, timestamp=now)
                logger.info(
                    'Sent %d lines to Graphite.',
                    graphitedata.count('\n')+1)
            if dashing is not None:
                dashing.push(newdata)

            logger.debug('Step 3/3: Merging current data ...')
            storage.merge_new_data(newdata)
            storage.save()

            logger.debug('I have data for %d nodes.', storage.status['nodes'])

        except Exception as err:
            logger.error(str(err))

        logger.debug('Sleeping for {0} seconds'.format(args.interval))
        time.sleep(args.interval)

    storage.close()
    logger.info('Shut down.')

if __name__ == '__main__':
    main()