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# This file is part of Glances. |
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# |
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# SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]> |
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# |
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# SPDX-License-Identifier: LGPL-3.0-only |
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# |
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"""ZeroMQ interface class.""" |
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import sys |
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import zmq |
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from zmq.utils.strtypes import asbytes |
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from glances.exports.export import GlancesExport |
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from glances.globals import b, json_dumps |
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from glances.logger import logger |
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class Export(GlancesExport): |
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"""This class manages the ZeroMQ export module.""" |
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def __init__(self, config=None, args=None): |
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"""Init the ZeroMQ export IF.""" |
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super().__init__(config=config, args=args) |
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# Mandatory configuration keys (additional to host and port) |
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self.prefix = None |
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# Optionals configuration keys |
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# N/A |
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# Load the ZeroMQ configuration file section ([export_zeromq]) |
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self.export_enable = self.load_conf('zeromq', mandatories=['host', 'port', 'prefix'], options=[]) |
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if not self.export_enable: |
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exit('Missing ZEROMQ config') |
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# Init the ZeroMQ context |
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self.context = None |
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self.client = self.init() |
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def init(self): |
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"""Init the connection to the CouchDB server.""" |
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if not self.export_enable: |
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return None |
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server_uri = f'tcp://{self.host}:{self.port}' |
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try: |
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self.context = zmq.Context() |
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publisher = self.context.socket(zmq.PUB) |
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publisher.bind(server_uri) |
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except Exception as e: |
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logger.critical(f"Cannot connect to ZeroMQ server {server_uri} ({e})") |
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sys.exit(2) |
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else: |
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logger.info(f"Connected to the ZeroMQ server {server_uri}") |
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return publisher |
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def exit(self): |
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"""Close the socket and context""" |
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if self.client is not None: |
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self.client.close() |
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if self.context is not None: |
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self.context.destroy() |
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def export(self, name, columns, points): |
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"""Write the points to the ZeroMQ server.""" |
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logger.debug(f"Export {name} stats to ZeroMQ") |
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# Create DB input |
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data = dict(zip(columns, points)) |
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# Do not publish empty stats |
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if data == {}: |
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return False |
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# Glances envelopes the stats in a publish message with two frames: |
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# - First frame containing the following prefix (STRING) |
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# - Second frame with the Glances plugin name (STRING) |
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# - Third frame with the Glances plugin stats (JSON) |
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message = [b(self.prefix), b(name), asbytes(json_dumps(data))] |
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# Write data to the ZeroMQ bus |
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# Result can be view: tcp://host:port |
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try: |
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self.client.send_multipart(message) |
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except Exception as e: |
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logger.error(f"Cannot export {name} stats to ZeroMQ ({e})") |
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return True |
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nicolargo /
glances
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