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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#

"""Riemann interface class."""

import socket
from numbers import Number

from glances.compat import range
from glances.logger import logger
from glances.exports.glances_export import GlancesExport

# Import bernhard for Riemann
import bernhard


class Export(GlancesExport):

    """This class manages the Riemann export module."""

    def __init__(self, config=None, args=None):
        """Init the Riemann export IF."""
        super(Export, self).__init__(config=config, args=args)

        # Mandatory configuration keys (additional to host and port)
        # N/A

        # Optional configuration keys
        # N/A

        # Load the Riemann configuration
        self.export_enable = self.load_conf('riemann', mandatories=['host', 'port'], options=[])
        if not self.export_enable:
            exit('Missing RIEMANN config')

        # Get the current hostname
        self.hostname = socket.gethostname()

        # Init the Riemann client
        self.client = self.init()

    def init(self):
        """Init the connection to the Riemann server."""
        if not self.export_enable:
            return None
        try:
            client = bernhard.Client(host=self.host, port=self.port)
            return client
        except Exception as e:
            logger.critical("Connection to Riemann failed : %s " % e)
            return None

    def export(self, name, columns, points):
        """Write the points in Riemann."""
        for i in range(len(columns)):
            if not isinstance(points[i], Number):
                continue
            else:
                data = {'host': self.hostname, 'service': name + " " + columns[i], 'metric': points[i]}
                logger.debug(data)
                try:
                    self.client.send(data)
                except Exception as e:
                    logger.error("Cannot export stats to Riemann (%s)" % e)