101 lines
3.6 KiB
Python
101 lines
3.6 KiB
Python
import asyncio
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import datetime
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import time
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import traceback
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import uuid
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from typing import List, Optional, Type
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from django.utils import timezone
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from stator.models import StatorModel
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class StatorRunner:
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"""
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Runs tasks on models that are looking for state changes.
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Designed to run for a determinate amount of time, and then exit.
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"""
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def __init__(
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self,
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models: List[Type[StatorModel]],
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concurrency: int = 50,
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concurrency_per_model: int = 10,
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liveness_file: Optional[str] = None,
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schedule_interval: int = 30,
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lock_expiry: int = 300,
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):
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self.models = models
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self.runner_id = uuid.uuid4().hex
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self.concurrency = concurrency
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self.concurrency_per_model = concurrency_per_model
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self.liveness_file = liveness_file
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self.schedule_interval = schedule_interval
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self.lock_expiry = lock_expiry
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async def run(self):
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self.handled = 0
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self.last_clean = time.monotonic() - self.schedule_interval
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self.tasks = []
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# For the first time period, launch tasks
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print("Running main task loop")
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try:
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while True:
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# Do we need to do cleaning?
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if (time.monotonic() - self.last_clean) >= self.schedule_interval:
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print(f"{self.handled} tasks processed so far")
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print("Running cleaning and scheduling")
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self.remove_completed_tasks()
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for model in self.models:
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asyncio.create_task(model.atransition_clean_locks())
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asyncio.create_task(model.atransition_schedule_due())
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self.last_clean = time.monotonic()
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# Calculate space left for tasks
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space_remaining = self.concurrency - len(self.tasks)
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# Fetch new tasks
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for model in self.models:
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if space_remaining > 0:
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for instance in await model.atransition_get_with_lock(
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number=min(space_remaining, self.concurrency_per_model),
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lock_expiry=(
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timezone.now()
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+ datetime.timedelta(seconds=self.lock_expiry)
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),
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):
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self.tasks.append(
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asyncio.create_task(self.run_transition(instance))
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)
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self.handled += 1
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space_remaining -= 1
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# Prevent busylooping
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await asyncio.sleep(0.1)
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except KeyboardInterrupt:
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# Wait for tasks to finish
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print("Waiting for tasks to complete")
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while True:
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self.remove_completed_tasks()
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if not self.tasks:
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break
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# Prevent busylooping
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await asyncio.sleep(1)
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print("Complete")
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return self.handled
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async def run_transition(self, instance: StatorModel):
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"""
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Wrapper for atransition_attempt with fallback error handling
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"""
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try:
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print(
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f"Attempting transition on {instance._meta.label_lower}#{instance.pk} from state {instance.state}"
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)
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await instance.atransition_attempt()
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except BaseException:
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traceback.print_exc()
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def remove_completed_tasks(self):
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"""
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Removes all completed asyncio.Tasks from our local in-progress list
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"""
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self.tasks = [t for t in self.tasks if not t.done()]
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