def check_children(self):
"""
Check for output from command channels and daemons, remove daemons
that died from list of running ones and place them in restart queue.
"""
for daemon in self.poll.poll():
if isinstance(daemon, control_socket.ControlSocket):
client = daemon.accept()
self.poll.add(client)
continue
if isinstance(daemon, control_socket.ControlSocketClient):
self.handle_command(daemon)
continue
# isinstance(daemon, daemon.Daemon)
self.handle_daemon_output(daemon)
# check if all the daemons are still running
for dname in self.running.keys(): # self.running can change
daemon = self.running[dname]
if not daemon.is_alive():
# close daemon's pipe, in case it was still opened
# FIXME: this can loose some of the daemon's output
self.poll.remove(daemon)
daemon.close()
del self.running[dname]
self.restart_queue.daemon_died(dname)
def handle_daemon_output(self, daemon):
"""
Handle output from a daemon according to daemon's definition: either
log it or forward it as a message.
"""
line = daemon.readline()
if line == "": # EOF, but this doesn't mean that the daemon died yet
self.poll.remove(daemon)
daemon.close()
else:
# TODO: process the line (JSON-decode and forward it or log using
# logging module)
pass