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https://github.com/avatao-content/baseimage-tutorial-framework
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100 lines
3.3 KiB
Python
100 lines
3.3 KiB
Python
import logging
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from tfw.networking import Scope
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from tfw.components.inotify import InotifyObserver
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from tfw.mixins.supervisor_mixin import SupervisorLogMixin
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from .event_handler import EventHandler
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LOG = logging.getLogger(__name__)
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class LogInotifyObserver(InotifyObserver, SupervisorLogMixin):
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def __init__(self, server_connector, process_name, log_tail=0):
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self._prevent_log_recursion()
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self._server_connector = server_connector
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self._process_name = process_name
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self.log_tail = log_tail
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self._procinfo = None
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InotifyObserver.__init__(self, self._get_logfiles())
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@staticmethod
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def _prevent_log_recursion():
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# This is done to prevent inotify event logs triggering themselves (infinite log recursion)
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logging.getLogger('watchdog.observers.inotify_buffer').propagate = False
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def _get_logfiles(self):
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self._procinfo = self.supervisor.getProcessInfo(self._process_name)
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return self._procinfo['stdout_logfile'], self._procinfo['stderr_logfile']
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@property
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def process_name(self):
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return self._process_name
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@process_name.setter
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def process_name(self, process_name):
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self._process_name = process_name
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self.paths = self._get_logfiles()
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def on_modified(self, event):
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self._server_connector.send_message({
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'key': 'processlog',
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'data': {
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'command': 'new_log',
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'stdout': self.read_stdout(self.process_name, tail=self.log_tail),
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'stderr': self.read_stderr(self.process_name, tail=self.log_tail)
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}
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}, Scope.BROADCAST)
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class LogMonitoringEventHandler(EventHandler):
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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, scope=Scope.WEBSOCKET)
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self.process_name = process_name
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self._monitor = LogInotifyObserver(self.server_connector, process_name, log_tail)
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self._monitor.start()
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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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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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