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import threading
import time
import queue
from dataclasses import dataclass, field
from typing import Any
import signal
import traceback
import os
@dataclass(order=True)
class ScheduledItem:
time_sec: float
cb: Any = field(compare=False)
class Driver:
def __init__(self):
self._scheduled = queue.PriorityQueue()
self._scheduled_every_lock = threading.Lock()
self._scheduled_every = []
self._callbacks_lock = threading.Lock()
self._callbacks = {}
self._async_queue = queue.Queue()
self._epoch_sec = time.time()
self._debug_epoch = None
self._last_epoch = None
self._sigterm_received = False
def get_epoch(self):
return self._epoch_sec
def set_debug_epoch(self, epoch):
self._debug_epoch = epoch
def run(self, wait_sync_interval=0, intercept_signals=(signal.SIGINT, signal.SIGTERM)):
if intercept_signals:
self.intercept_sigterm(intercept_signals)
while not self.sigterm_received():
self.run_step(wait_sync_interval)
def run_step(self, wait_sync_interval=0):
if self._debug_epoch:
self._epoch_sec = self._debug_epoch
else:
self._epoch_sec = time.time()
if self._last_epoch is not None:
if self._epoch_sec - self._last_epoch < wait_sync_interval:
t = wait_sync_interval - (self._epoch_sec - self._last_epoch)
time.sleep(t)
self._epoch_sec = time.time()
self._last_epoch = self._epoch_sec
self._do_async()
self._do_schedule()
self._do_schedule_every()
def schedule(self, cb, time_sec):
self._scheduled.put_nowait( ScheduledItem(time_sec, cb) )
def schedule_every(self, cb, interval_sec):
self._scheduled_every_lock.acquire()
self._scheduled_every.append( { "next_sec":self._epoch_sec+interval_sec, "interval":interval_sec, "cb":cb } )
self._scheduled_every_lock.release()
def add_receiver(self, topic_or_type, cb):
self._callbacks_lock.acquire()
if topic_or_type not in self._callbacks:
self._callbacks[topic_or_type] = set()
self._callbacks[topic_or_type].add(cb)
self._callbacks_lock.release()
return cb
def remove_receiver(self, topic_or_type, cb):
self._callbacks_lock.acquire()
if topic_or_type in self._callbacks:
if cb in self._callbacks[topic_or_type]:
self._callbacks[topic_or_type].remove(cb)
self._callbacks_lock.release()
def send(self, obj, topic=None):
if topic == None:
topic = type(obj)
cbs = []
self._callbacks_lock.acquire()
if topic in self._callbacks.keys():
cbs = list(self._callbacks[topic])
self._callbacks_lock.release()
for cb in cbs:
cb(obj)
def send_async(self, obj, topic=None):
self._async_queue.put_nowait( (obj, topic) )
def _do_async(self):
while not self._async_queue.empty():
self.send(*self._async_queue.get_nowait())
def _do_schedule(self):
i = 0
while not self._scheduled.empty():
item = self._scheduled.get_nowait()
if item.time_sec > self._epoch_sec:
self._scheduled.put_nowait(item)
break
item.cb(self._epoch_sec)
def _do_schedule_every(self):
cbs = []
self._scheduled_every_lock.acquire()
for o in self._scheduled_every:
while self._epoch_sec >= o["next_sec"]:
cbs.append(o["cb"])
o["next_sec"] += o["interval"]
self._scheduled_every_lock.release()
for cb in cbs:
cb(self._epoch_sec)
def intercept_sigterm(self, intercept_signals):
for sig in intercept_signals:
signal.signal(sig, bind(Driver._on_signal, self))
def sigterm_received(self):
return self._sigterm_received
def _on_signal(self, signum, stack):
print(f"Signal #{signum} received, Traceback:")
for filename, lineno, _, line in traceback.extract_stack(stack):
print(' at %s(%s:%d)' % (line, filename[filename.rfind(os.path.sep) + 1:], lineno))
self._sigterm_received = True
def bind(func, *args, **kw):
return lambda *_args, **_kw: func(*args, *_args, **kw, **_kw)
driver = Driver()
if __name__ == '__main__':
print("initialize")
driver.schedule(lambda epoch: print(f"Do sth. one time"), driver.get_epoch()+3)
driver.schedule_every(lambda epoch: print(f"Do sth. regularly"), 1)
driver.schedule(lambda _: os.system(f"kill {os.getpid()}"), driver.get_epoch()+10)
driver.run(0.1)
print("finalize")
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