63 lines
2.0 KiB
Python
63 lines
2.0 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
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# All Rights Reserved. See LICENSE file for details.
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from tfw import EventHandlerBase
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from tfw.mixins import MonitorManagerMixin
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from tfw.config.logs import logging
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from .log_monitor import LogMonitor
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LOG = logging.getLogger(__name__)
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class LogMonitoringEventHandler(EventHandlerBase, MonitorManagerMixin):
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"""
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Monitors the output of a supervisor process (stdout, stderr) and
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sends the results to the frontend.
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Accepts messages that have a data['command'] key specifying
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a command to be executed.
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The API of each command is documented in their respective handler.
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"""
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def __init__(self, key, process_name, log_tail=0):
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super().__init__(key)
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self.process_name = process_name
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self.log_tail = log_tail
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MonitorManagerMixin.__init__(self, LogMonitor, self.process_name, self.log_tail)
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self.command_handlers = {
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'process_name': self.handle_process_name,
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'log_tail': self.handle_log_tail
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}
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def handle_event(self, message):
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try:
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data = message['data']
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self.command_handlers[data['command']](data)
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self.reload_monitor()
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except KeyError:
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LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
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def handle_process_name(self, data):
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"""
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Changes the monitored process.
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:param data: TFW message data containing 'value'
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(name of the process to monitor)
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"""
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self.set_monitor_args(data['value'], self.log_tail)
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def handle_log_tail(self, data):
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"""
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Sets tail length of the log the monitor will send
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to the frontend (the monitor will send back the last
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'value' characters of the log).
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:param data: TFW message data containing 'value'
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(new tail length)
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"""
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self.set_monitor_args(self.process_name, data['value'])
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def cleanup(self):
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self.monitor.stop()
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