baseimage-tutorial-framework/tfw/components/process_management/log_inotify_observer.py

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import logging
from tfw.internals.networking import Scope
from tfw.internals.inotify import InotifyObserver
from .supervisor import ProcessLogManager
class LogInotifyObserver(InotifyObserver, ProcessLogManager):
def __init__(self, server_connector, supervisor_uri, process_name, log_tail=0):
self._prevent_log_recursion()
self._server_connector = server_connector
self._process_name = process_name
self.log_tail = log_tail
self._procinfo = None
ProcessLogManager.__init__(self, supervisor_uri)
InotifyObserver.__init__(self, self._get_logfiles())
@staticmethod
def _prevent_log_recursion():
# This is done to prevent inotify event logs triggering themselves (infinite log recursion)
logging.getLogger('watchdog.observers.inotify_buffer').propagate = False
def _get_logfiles(self):
self._procinfo = self.supervisor.getProcessInfo(self._process_name)
return self._procinfo['stdout_logfile'], self._procinfo['stderr_logfile']
@property
def process_name(self):
return self._process_name
@process_name.setter
def process_name(self, process_name):
self._process_name = process_name
self.paths = self._get_logfiles()
def on_modified(self, event):
self._server_connector.send_message({
'key': 'processlog',
'data': {
'command': 'new_log',
'stdout': self.read_stdout(self.process_name, tail=self.log_tail),
'stderr': self.read_stderr(self.process_name, tail=self.log_tail)
}
}, Scope.BROADCAST)