kopia lustrzana https://github.com/OpenDroneMap/WebODM
112 wiersze
3.7 KiB
Python
112 wiersze
3.7 KiB
Python
import logging, traceback
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from apscheduler.schedulers.background import BackgroundScheduler
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from apscheduler.schedulers import SchedulerAlreadyRunningError, SchedulerNotRunningError
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from threading import Thread, Lock
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from multiprocessing.dummy import Pool as ThreadPool
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from nodeodm.models import ProcessingNode
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from app.models import Task
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from django.db.models import Q
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from django import db
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from nodeodm import status_codes
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import random
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logger = logging.getLogger('app.logger')
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scheduler = BackgroundScheduler({
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'apscheduler.job_defaults.coalesce': 'false',
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'apscheduler.job_defaults.max_instances': '3',
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})
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def background(func):
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"""
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Adds background={True|False} param to any function
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so that we can call update_nodes_info(background=True) from the outside
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"""
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def wrapper(*args,**kwargs):
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background = kwargs.get('background', False)
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if 'background' in kwargs: del kwargs['background']
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if background:
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# Create a function that closes all
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# db connections at the end of the thread
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# This is necessary to make sure we don't leave
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# open connections lying around.
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def execute_and_close_db():
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ret = None
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try:
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ret = func(*args, **kwargs)
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finally:
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db.connections.close_all()
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return ret
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t = Thread(target=execute_and_close_db)
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t.start()
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return t
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else:
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return func(*args, **kwargs)
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return wrapper
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@background
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def update_nodes_info():
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processing_nodes = ProcessingNode.objects.all()
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for processing_node in processing_nodes:
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processing_node.update_node_info()
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tasks_mutex = Lock()
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@background
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def process_pending_tasks():
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tasks = []
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try:
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tasks_mutex.acquire()
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# All tasks that have a processing node assigned
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# but don't have a UUID
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# or tasks that have a pending action
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# and that are not locked (being processed by another thread)
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tasks = Task.objects.filter(Q(uuid='', last_error__isnull=True, processing_node__isnull=False) |
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Q(status__in=[status_codes.QUEUED, status_codes.RUNNING], processing_node__isnull=False) |
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Q(status=None, processing_node__isnull=False) |
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Q(pending_action__isnull=False)).exclude(Q(processing_lock=True))
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for task in tasks:
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logger.info("Acquiring lock: {}".format(task))
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task.processing_lock = True
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task.save()
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finally:
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tasks_mutex.release()
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def process(task):
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try:
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task.process()
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# Might have been deleted
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if task.pk is not None:
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task.processing_lock = False
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task.save()
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except Exception as e:
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logger.error("Uncaught error: {} {}".format(e, traceback.format_exc()))
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if tasks.count() > 0:
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pool = ThreadPool(tasks.count())
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pool.map(process, tasks, chunksize=1)
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pool.close()
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pool.join()
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def setup():
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logger.info("Starting background scheduler...")
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try:
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scheduler.start()
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scheduler.add_job(update_nodes_info, 'interval', seconds=30)
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scheduler.add_job(process_pending_tasks, 'interval', seconds=5)
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except SchedulerAlreadyRunningError:
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logger.warn("Scheduler already running (this is OK while testing)")
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def teardown():
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logger.info("Stopping scheduler...")
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try:
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scheduler.shutdown()
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logger.info("Scheduler stopped")
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except SchedulerNotRunningError:
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logger.warn("Scheduler not running")
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