1 | # -*- coding: utf-8 -*- |
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2 | # |
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3 | # This file is part of Glances. |
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4 | # |
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5 | # Copyright (C) 2019 Nicolargo <[email protected]> |
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6 | # |
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7 | # Glances is free software; you can redistribute it and/or modify |
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8 | # it under the terms of the GNU Lesser General Public License as published by |
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9 | # the Free Software Foundation, either version 3 of the License, or |
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10 | # (at your option) any later version. |
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11 | # |
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12 | # Glances is distributed in the hope that it will be useful, |
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | # GNU Lesser General Public License for more details. |
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16 | # |
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17 | # You should have received a copy of the GNU Lesser General Public License |
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18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 | |||
20 | """ZeroMQ interface class.""" |
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21 | |||
22 | import sys |
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23 | import json |
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24 | |||
25 | from glances.compat import b |
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26 | from glances.logger import logger |
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27 | from glances.exports.glances_export import GlancesExport |
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28 | |||
29 | import zmq |
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30 | from zmq.utils.strtypes import asbytes |
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31 | |||
32 | |||
33 | class Export(GlancesExport): |
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34 | |||
35 | """This class manages the ZeroMQ export module.""" |
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36 | |||
37 | View Code Duplication | def __init__(self, config=None, args=None): |
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38 | """Init the ZeroMQ export IF.""" |
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39 | super(Export, self).__init__(config=config, args=args) |
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40 | |||
41 | # Mandatories configuration keys (additional to host and port) |
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42 | self.prefix = None |
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43 | |||
44 | # Optionals configuration keys |
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45 | # N/A |
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46 | |||
47 | # Load the ZeroMQ configuration file section ([export_zeromq]) |
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48 | self.export_enable = self.load_conf('zeromq', |
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49 | mandatories=['host', 'port', 'prefix'], |
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50 | options=[]) |
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51 | if not self.export_enable: |
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52 | sys.exit(2) |
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53 | |||
54 | # Init the ZeroMQ context |
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55 | self.context = None |
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56 | self.client = self.init() |
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57 | |||
58 | def init(self): |
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59 | """Init the connection to the CouchDB server.""" |
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60 | if not self.export_enable: |
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61 | return None |
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62 | |||
63 | server_uri = 'tcp://{}:{}'.format(self.host, self.port) |
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64 | |||
65 | try: |
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66 | self.context = zmq.Context() |
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67 | publisher = self.context.socket(zmq.PUB) |
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68 | publisher.bind(server_uri) |
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69 | except Exception as e: |
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70 | logger.critical("Cannot connect to ZeroMQ server %s (%s)" % (server_uri, e)) |
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71 | sys.exit(2) |
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72 | else: |
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73 | logger.info("Connected to the ZeroMQ server %s" % server_uri) |
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74 | |||
75 | return publisher |
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76 | |||
77 | def exit(self): |
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78 | """Close the socket and context""" |
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79 | if self.client is not None: |
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80 | self.client.close() |
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81 | if self.context is not None: |
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82 | self.context.destroy() |
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83 | |||
84 | def export(self, name, columns, points): |
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85 | """Write the points to the ZeroMQ server.""" |
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86 | logger.debug("Export {} stats to ZeroMQ".format(name)) |
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87 | |||
88 | # Create DB input |
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89 | data = dict(zip(columns, points)) |
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90 | |||
91 | # Do not publish empty stats |
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92 | if data == {}: |
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93 | return False |
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94 | |||
95 | # Glances envelopes the stats in a publish message with two frames: |
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96 | # - First frame containing the following prefix (STRING) |
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97 | # - Second frame with the Glances plugin name (STRING) |
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98 | # - Third frame with the Glances plugin stats (JSON) |
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99 | message = [b(self.prefix), |
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100 | b(name), |
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101 | asbytes(json.dumps(data))] |
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102 | |||
103 | # Write data to the ZeroMQ bus |
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104 | # Result can be view: tcp://host:port |
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105 | try: |
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106 | self.client.send_multipart(message) |
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107 | except Exception as e: |
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108 | logger.error("Cannot export {} stats to ZeroMQ ({})".format(name, e)) |
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109 | |||
110 | return True |
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111 |