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https://github.com/avatao-content/baseimage-tutorial-framework
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69 lines
2.0 KiB
Python
69 lines
2.0 KiB
Python
import logging
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from .log_inotify_observer import LogInotifyObserver
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LOG = logging.getLogger(__name__)
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class ProcessLogHandler:
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keys = ['logmonitor']
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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, *, process_name, supervisor_uri, log_tail=0):
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self.connector = None
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self.process_name = process_name
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self._supervisor_uri = supervisor_uri
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self._initial_log_tail = log_tail
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self._monitor = None
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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 start(self):
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self._monitor = LogInotifyObserver(
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connector=self.connector,
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supervisor_uri=self._supervisor_uri,
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process_name=self.process_name,
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log_tail=self._initial_log_tail
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)
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self._monitor.start()
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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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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._monitor.process_name = data['value']
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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._monitor.log_tail = data['value']
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def cleanup(self):
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self._monitor.stop()
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