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 | """Cassandra/Scylla interface class.""" |
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21 | |||
22 | import sys |
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23 | from datetime import datetime |
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24 | from numbers import Number |
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25 | |||
26 | from glances.logger import logger |
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27 | from glances.exports.glances_export import GlancesExport |
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28 | from glances.compat import iteritems |
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29 | |||
30 | from cassandra.auth import PlainTextAuthProvider |
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31 | from cassandra.cluster import Cluster |
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32 | from cassandra.util import uuid_from_time |
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33 | from cassandra import InvalidRequest |
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34 | |||
35 | |||
36 | class Export(GlancesExport): |
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37 | |||
38 | """This class manages the Cassandra/Scylla export module.""" |
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39 | |||
40 | def __init__(self, config=None, args=None): |
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41 | """Init the Cassandra export IF.""" |
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42 | super(Export, self).__init__(config=config, args=args) |
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43 | |||
44 | # Mandatories configuration keys (additional to host and port) |
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45 | self.keyspace = None |
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46 | |||
47 | # Optionals configuration keys |
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48 | self.protocol_version = 3 |
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49 | self.replication_factor = 2 |
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50 | self.table = None |
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51 | self.username = None |
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52 | self.password = None |
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53 | |||
54 | # Load the Cassandra configuration file section |
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55 | self.export_enable = self.load_conf('cassandra', |
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56 | mandatories=['host', 'port', 'keyspace'], |
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57 | options=['protocol_version', |
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58 | 'replication_factor', |
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59 | 'table', |
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60 | 'username', |
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61 | 'password']) |
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62 | if not self.export_enable: |
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63 | sys.exit(2) |
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64 | |||
65 | # Init the Cassandra client |
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66 | self.cluster, self.session = self.init() |
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67 | |||
68 | def init(self): |
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69 | """Init the connection to the Cassandra server.""" |
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70 | if not self.export_enable: |
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71 | return None |
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72 | |||
73 | # if username and/or password are not set the connection will try to connect with no auth |
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74 | auth_provider = PlainTextAuthProvider( |
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75 | username=self.username, password=self.password) |
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76 | |||
77 | # Cluster |
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78 | try: |
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79 | cluster = Cluster([self.host], |
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80 | port=int(self.port), |
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81 | protocol_version=int(self.protocol_version), |
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82 | auth_provider=auth_provider) |
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83 | session = cluster.connect() |
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84 | except Exception as e: |
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85 | logger.critical("Cannot connect to Cassandra cluster '%s:%s' (%s)" % (self.host, self.port, e)) |
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86 | sys.exit(2) |
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87 | |||
88 | # Keyspace |
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89 | try: |
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90 | session.set_keyspace(self.keyspace) |
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91 | except InvalidRequest as e: |
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92 | logger.info("Create keyspace {} on the Cassandra cluster".format(self.keyspace)) |
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93 | c = "CREATE KEYSPACE %s WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '%s' }" % (self.keyspace, self.replication_factor) |
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94 | session.execute(c) |
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95 | session.set_keyspace(self.keyspace) |
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96 | |||
97 | logger.info( |
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98 | "Stats will be exported to Cassandra cluster {} ({}) in keyspace {}".format( |
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99 | cluster.metadata.cluster_name, cluster.metadata.all_hosts(), self.keyspace)) |
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100 | |||
101 | # Table |
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102 | try: |
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103 | session.execute("CREATE TABLE %s (plugin text, time timeuuid, stat map<text,float>, PRIMARY KEY (plugin, time)) WITH CLUSTERING ORDER BY (time DESC)" % self.table) |
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104 | except Exception: |
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105 | logger.debug("Cassandra table %s already exist" % self.table) |
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106 | |||
107 | return cluster, session |
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108 | |||
109 | def export(self, name, columns, points): |
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110 | """Write the points to the Cassandra cluster.""" |
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111 | logger.debug("Export {} stats to Cassandra".format(name)) |
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112 | |||
113 | # Remove non number stats and convert all to float (for Boolean) |
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114 | data = {k: float(v) for (k, v) in dict(zip(columns, points)).iteritems() if isinstance(v, Number)} |
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115 | |||
116 | # Write input to the Cassandra table |
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117 | try: |
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118 | |||
119 | stmt = "INSERT INTO {} (plugin, time, stat) VALUES (?, ?, ?)".format(self.table) |
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120 | query = self.session.prepare(stmt) |
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121 | self.session.execute( |
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122 | query, |
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123 | (name, uuid_from_time(datetime.now()), data) |
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124 | ) |
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125 | except Exception as e: |
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126 | logger.error("Cannot export {} stats to Cassandra ({})".format(name, e)) |
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127 | |||
128 | def exit(self): |
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129 | """Close the Cassandra export module.""" |
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130 | # To ensure all connections are properly closed |
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131 | self.session.shutdown() |
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132 | self.cluster.shutdown() |
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133 | # Call the father method |
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134 | super(Export, self).exit() |
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135 |