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111 lines
3.3 KiB
Python
111 lines
3.3 KiB
Python
"""
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The Management - this module takes care of loading and running subordinate
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bureaus in the office organization. Bureaus are enabled in the file
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"~/.screenless/mgmt.ini":
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[mgmt]
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bureaus = ihr typing myburo and so on
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"""
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import configparser
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import importlib
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import multiprocessing
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import os
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import signal
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import time
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class Management:
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"""
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Management is the executive of the Screenless Office. It can start, stop
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and reconfigure the subordinate bureaus of the office.
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"""
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def __init__(self):
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basepath = os.path.expanduser("~/.screenless")
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if not os.path.exists(basepath):
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os.mkdir(basepath)
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os.chdir(basepath)
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fontpath = os.path.join(basepath, "fonts")
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if not os.path.exists(fontpath):
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os.mkdir(fontpath)
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self.procs = {}
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self.org_chart = []
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self._load_config()
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self.wait_restart = False
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def _load_config(self):
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config = configparser.ConfigParser()
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try:
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config.read("mgmt.ini")
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self.org_chart = config["mgmt"]["bureaus"].split()
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except KeyError:
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config["mgmt"] = {"bureaus":
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"ihr typing publicrelations photography jokes"}
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with open("mgmt.ini", "w") as configfile:
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config.write(configfile)
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print("Created new mgmt.ini config file. Please modify to suit.")
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self.org_chart = config["mgmt"]["bureaus"].split()
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def _start_bureaus(self):
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"""
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Initialized and start all child bureaus
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"""
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for buro in self.org_chart:
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self._start_bureau(buro)
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self.wait_restart = False
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def _start_bureau(self, bureau_name):
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"""
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starts an individual bureau
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"""
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lib = importlib.import_module("bureau." + bureau_name)
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proc = multiprocessing.Process(target=lib.main)
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self.procs[bureau_name] = proc
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proc.start()
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def _stop_bureaus(self):
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"""
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Terminates all running bureau children
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"""
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self.wait_restart = True
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for buro in self.org_chart:
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proc = self.procs[buro]
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proc.terminate()
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def reload(self, signum=None, frame=None):
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"""
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stop all bureaus, reload config, restart all bureaus.
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Note, this may cause a loss of state in some cases.
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"""
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self._stop_bureaus()
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self._load_config()
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self._start_bureaus()
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def run(self):
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"""
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main loop for Management, will restart crashed bureaus
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and reload everything when sent a SIGHUP
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"""
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with open("mgmt.pid", "w") as pfile:
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pfile.write(str(os.getpid()))
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signal.signal(signal.SIGHUP, self.reload)
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self._start_bureaus()
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while True:
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if self.wait_restart:
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time.sleep(1)
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continue
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for buro in self.org_chart:
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proc = self.procs[buro]
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if not proc.is_alive():
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print("bureau", buro, "has crashed! Call the consultants!")
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time.sleep(3)
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print("restarting", buro)
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self._start_bureau(buro)
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time.sleep(1)
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if __name__ == "__main__":
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mgmt = Management()
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mgmt.run()
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