mirror of https://gitlab.com/bashrc2/epicyon
150 lines
4.4 KiB
Python
150 lines
4.4 KiB
Python
__filename__ = "threads.py"
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__author__ = "Bob Mottram"
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__license__ = "AGPL3+"
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__version__ = "1.2.0"
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__maintainer__ = "Bob Mottram"
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__email__ = "bob@freedombone.net"
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__status__ = "Production"
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__module_group__ = "Core"
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import threading
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import sys
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import time
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import datetime
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class threadWithTrace(threading.Thread):
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def __init__(self, *args, **keywords):
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self.startTime = datetime.datetime.utcnow()
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self.isStarted = False
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tries = 0
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while tries < 3:
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try:
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self._args, self._keywords = args, keywords
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threading.Thread.__init__(self, *self._args, **self._keywords)
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self.killed = False
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break
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except Exception as e:
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print('ERROR: threads.py/__init__ failed - ' + str(e))
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time.sleep(1)
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tries += 1
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def start(self):
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tries = 0
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while tries < 3:
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try:
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self.__run_backup = self.run
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self.run = self.__run
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threading.Thread.start(self)
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break
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except Exception as e:
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print('ERROR: threads.py/start failed - ' + str(e))
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time.sleep(1)
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tries += 1
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# note that this is set True even if all tries failed
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self.isStarted = True
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def __run(self):
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sys.settrace(self.globaltrace)
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self.__run_backup()
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self.run = self.__run_backup
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def globaltrace(self, frame, event, arg):
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if event == 'call':
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return self.localtrace
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else:
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return None
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def localtrace(self, frame, event, arg):
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if self.killed:
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if event == 'line':
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raise SystemExit()
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return self.localtrace
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def kill(self):
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self.killed = True
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def clone(self, fn):
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return threadWithTrace(target=fn,
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args=self._args,
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daemon=True)
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def removeDormantThreads(baseDir: str, threadsList: [], debug: bool,
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timeoutMins=30) -> None:
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"""Removes threads whose execution has completed
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"""
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if len(threadsList) == 0:
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return
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timeoutSecs = int(timeoutMins * 60)
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dormantThreads = []
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currTime = datetime.datetime.utcnow()
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changed = False
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# which threads are dormant?
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noOfActiveThreads = 0
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for th in threadsList:
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removeThread = False
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if th.isStarted:
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if not th.is_alive():
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if (currTime - th.startTime).total_seconds() > 10:
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if debug:
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print('DEBUG: ' +
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'thread is not alive ten seconds after start')
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removeThread = True
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# timeout for started threads
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if (currTime - th.startTime).total_seconds() > timeoutSecs:
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if debug:
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print('DEBUG: started thread timed out')
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removeThread = True
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else:
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# timeout for threads which havn't been started
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if (currTime - th.startTime).total_seconds() > timeoutSecs:
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if debug:
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print('DEBUG: unstarted thread timed out')
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removeThread = True
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if removeThread:
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dormantThreads.append(th)
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else:
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noOfActiveThreads += 1
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if debug:
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print('DEBUG: ' + str(noOfActiveThreads) +
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' active threads out of ' + str(len(threadsList)))
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# remove the dormant threads
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dormantCtr = 0
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for th in dormantThreads:
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if debug:
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print('DEBUG: Removing dormant thread ' + str(dormantCtr))
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dormantCtr += 1
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threadsList.remove(th)
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th.kill()
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changed = True
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# start scheduled threads
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if len(threadsList) < 10:
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ctr = 0
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for th in threadsList:
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if not th.isStarted:
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print('Starting new send thread ' + str(ctr))
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th.start()
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changed = True
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break
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ctr += 1
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if not changed:
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return
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if debug:
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sendLogFilename = baseDir + '/send.csv'
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try:
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with open(sendLogFilename, "a+") as logFile:
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logFile.write(currTime.strftime("%Y-%m-%dT%H:%M:%SZ") +
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',' + str(noOfActiveThreads) +
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',' + str(len(threadsList)) + '\n')
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except BaseException:
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pass
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