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 | # SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]> |
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6 | # |
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7 | # SPDX-License-Identifier: LGPL-3.0-only |
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8 | # |
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9 | |||
10 | """ZeroMQ interface class.""" |
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11 | |||
12 | import sys |
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13 | |||
14 | from glances.globals import b |
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15 | from glances.logger import logger |
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16 | from glances.exports.export import GlancesExport |
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17 | from glances.globals import json_dumps |
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18 | |||
19 | import zmq |
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20 | from zmq.utils.strtypes import asbytes |
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21 | |||
22 | |||
23 | class Export(GlancesExport): |
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24 | |||
25 | """This class manages the ZeroMQ export module.""" |
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26 | |||
27 | View Code Duplication | def __init__(self, config=None, args=None): |
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28 | """Init the ZeroMQ export IF.""" |
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29 | super(Export, self).__init__(config=config, args=args) |
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30 | |||
31 | # Mandatory configuration keys (additional to host and port) |
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32 | self.prefix = None |
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33 | |||
34 | # Optionals configuration keys |
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35 | # N/A |
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36 | |||
37 | # Load the ZeroMQ configuration file section ([export_zeromq]) |
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38 | self.export_enable = self.load_conf('zeromq', mandatories=['host', 'port', 'prefix'], options=[]) |
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39 | if not self.export_enable: |
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40 | exit('Missing ZEROMQ config') |
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41 | |||
42 | # Init the ZeroMQ context |
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43 | self.context = None |
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44 | self.client = self.init() |
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45 | |||
46 | def init(self): |
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47 | """Init the connection to the CouchDB server.""" |
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48 | if not self.export_enable: |
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49 | return None |
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50 | |||
51 | server_uri = 'tcp://{}:{}'.format(self.host, self.port) |
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52 | |||
53 | try: |
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54 | self.context = zmq.Context() |
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55 | publisher = self.context.socket(zmq.PUB) |
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56 | publisher.bind(server_uri) |
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57 | except Exception as e: |
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58 | logger.critical("Cannot connect to ZeroMQ server %s (%s)" % (server_uri, e)) |
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59 | sys.exit(2) |
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60 | else: |
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61 | logger.info("Connected to the ZeroMQ server %s" % server_uri) |
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62 | |||
63 | return publisher |
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64 | |||
65 | def exit(self): |
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66 | """Close the socket and context""" |
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67 | if self.client is not None: |
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68 | self.client.close() |
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69 | if self.context is not None: |
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70 | self.context.destroy() |
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71 | |||
72 | def export(self, name, columns, points): |
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73 | """Write the points to the ZeroMQ server.""" |
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74 | logger.debug("Export {} stats to ZeroMQ".format(name)) |
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75 | |||
76 | # Create DB input |
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77 | data = dict(zip(columns, points)) |
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78 | |||
79 | # Do not publish empty stats |
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80 | if data == {}: |
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81 | return False |
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82 | |||
83 | # Glances envelopes the stats in a publish message with two frames: |
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84 | # - First frame containing the following prefix (STRING) |
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85 | # - Second frame with the Glances plugin name (STRING) |
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86 | # - Third frame with the Glances plugin stats (JSON) |
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87 | message = [b(self.prefix), b(name), asbytes(json_dumps(data))] |
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88 | |||
89 | # Write data to the ZeroMQ bus |
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90 | # Result can be view: tcp://host:port |
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91 | try: |
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92 | self.client.send_multipart(message) |
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93 | except Exception as e: |
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94 | logger.error("Cannot export {} stats to ZeroMQ ({})".format(name, e)) |
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95 | |||
96 | return True |
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97 |