68 lines
1.6 KiB
Python
68 lines
1.6 KiB
Python
'''
|
|
Here we're abusing _asyncios TaskQueue to implement a very simple priority
|
|
queue task scheduler.
|
|
Despite documentation, Circuitpython doesn't usually ship with a min-heap
|
|
module; it does however implement a pairing-heap for `TaskQueue` in native code.
|
|
'''
|
|
|
|
try:
|
|
from typing import Callable
|
|
except ImportError:
|
|
pass
|
|
|
|
from supervisor import ticks_ms
|
|
|
|
from _asyncio import Task, TaskQueue
|
|
|
|
from kmk.kmktime import ticks_add, ticks_diff
|
|
|
|
_task_queue = TaskQueue()
|
|
|
|
|
|
class PeriodicTaskMeta:
|
|
def __init__(self, func: Callable[[None], None], period: int) -> None:
|
|
self._task = Task(self.call)
|
|
self._coro = func
|
|
self.period = period
|
|
|
|
def call(self) -> None:
|
|
self._coro()
|
|
after_ms = ticks_add(self._task.ph_key, self.period)
|
|
_task_queue.push_sorted(self._task, after_ms)
|
|
|
|
|
|
def create_task(
|
|
func: Callable[[None], None],
|
|
*,
|
|
after_ms: int = 0,
|
|
period_ms: int = 0,
|
|
) -> [Task, PeriodicTaskMeta]:
|
|
if period_ms:
|
|
r = PeriodicTaskMeta(func, period_ms)
|
|
t = r._task
|
|
else:
|
|
t = r = Task(func)
|
|
|
|
if after_ms:
|
|
after_ms = ticks_add(ticks_ms(), after_ms)
|
|
_task_queue.push_sorted(t, after_ms)
|
|
else:
|
|
_task_queue.push_head(t)
|
|
|
|
return r
|
|
|
|
|
|
def get_due_task() -> [Callable, None]:
|
|
while True:
|
|
t = _task_queue.peek()
|
|
if not t or ticks_diff(t.ph_key, ticks_ms()) > 0:
|
|
break
|
|
_task_queue.pop_head()
|
|
yield t.coro
|
|
|
|
|
|
def cancel_task(t: [Task, PeriodicTaskMeta]) -> None:
|
|
if isinstance(t, PeriodicTaskMeta):
|
|
t = t._task
|
|
_task_queue.remove(t)
|