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 | """Kafka interface class.""" |
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21 | |||
22 | import sys |
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23 | |||
24 | from glances.logger import logger |
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25 | from glances.compat import iteritems |
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26 | from glances.exports.glances_export import GlancesExport |
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27 | |||
28 | from kafka import KafkaProducer |
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29 | import json |
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30 | |||
31 | |||
32 | class Export(GlancesExport): |
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33 | |||
34 | """This class manages the Kafka export module.""" |
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35 | |||
36 | def __init__(self, config=None, args=None): |
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37 | """Init the Kafka export IF.""" |
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38 | super(Export, self).__init__(config=config, args=args) |
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39 | |||
40 | # Mandatories configuration keys (additional to host and port) |
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41 | self.topic = None |
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42 | |||
43 | # Optionals configuration keys |
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44 | self.compression = None |
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45 | |||
46 | # Load the Kafka configuration file section |
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47 | self.export_enable = self.load_conf('kafka', |
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48 | mandatories=['host', 'port', 'topic'], |
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49 | options=['compression']) |
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50 | if not self.export_enable: |
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51 | sys.exit(2) |
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52 | |||
53 | # Init the kafka client |
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54 | self.client = self.init() |
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55 | |||
56 | def init(self): |
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57 | """Init the connection to the Kafka server.""" |
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58 | if not self.export_enable: |
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59 | return None |
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60 | |||
61 | # Build the server URI with host and port |
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62 | server_uri = '{}:{}'.format(self.host, self.port) |
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63 | |||
64 | try: |
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65 | s = KafkaProducer(bootstrap_servers=server_uri, |
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66 | value_serializer=lambda v: json.dumps(v).encode('utf-8'), |
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67 | compression_type=self.compression) |
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68 | except Exception as e: |
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69 | logger.critical("Cannot connect to Kafka server %s (%s)" % (server_uri, e)) |
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70 | sys.exit(2) |
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71 | else: |
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72 | logger.info("Connected to the Kafka server %s" % server_uri) |
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73 | |||
74 | return s |
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75 | |||
76 | def export(self, name, columns, points): |
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77 | """Write the points to the kafka server.""" |
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78 | logger.debug("Export {} stats to Kafka".format(name)) |
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79 | |||
80 | # Create DB input |
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81 | data = dict(zip(columns, points)) |
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82 | |||
83 | # Send stats to the kafka topic |
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84 | # key=<plugin name> |
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85 | # value=JSON dict |
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86 | try: |
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87 | self.client.send(self.topic, |
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88 | key=name, |
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89 | value=data) |
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90 | except Exception as e: |
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91 | logger.error("Cannot export {} stats to Kafka ({})".format(name, e)) |
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92 | |||
93 | def exit(self): |
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94 | """Close the Kafka export module.""" |
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95 | # To ensure all connections are properly closed |
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96 | self.client.flush() |
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97 | self.client.close() |
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98 | # Call the father method |
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99 | super(Export, self).exit() |
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100 |