60 lines
2.4 KiB
Python
60 lines
2.4 KiB
Python
from datetime import date, timedelta, datetime
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import platform
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from django.db.models import Q
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from celery.task import Task, PeriodicTask
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from celery.decorators import task
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from documents import Document
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from ocr.api import do_document_ocr
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from literals import QUEUEDOCUMENT_STATE_PENDING, \
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QUEUEDOCUMENT_STATE_PROCESSING, DOCUMENTQUEUE_STATE_ACTIVE, \
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QUEUEDOCUMENT_STATE_ERROR
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from models import QueueDocument, DocumentQueue
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from ocr.conf.settings import NODE_CONCURRENT_EXECUTION
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from ocr.conf.settings import REPLICATION_DELAY
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@task
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def task_process_queue_document(queue_document_id):
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queue_document = QueueDocument.objects.get(id=queue_document_id)
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queue_document.state = QUEUEDOCUMENT_STATE_PROCESSING
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queue_document.node_name = platform.node()
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queue_document.save()
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try:
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do_document_ocr(queue_document.document)
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queue_document.delete()
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except Exception, e:
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queue_document.state = QUEUEDOCUMENT_STATE_ERROR
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queue_document.result = e
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queue_document.save()
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class DocumentQueueWatcher(PeriodicTask):
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run_every = timedelta(seconds=5)
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def run(self, **kwargs):
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logger = self.get_logger(**kwargs)
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logger.info('Running queue watcher.')
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logger.debug('Active queues: %s' % DocumentQueue.objects.filter(state=DOCUMENTQUEUE_STATE_ACTIVE))
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q_pending = Q(state=QUEUEDOCUMENT_STATE_PENDING)
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q_delayed = Q(delay=True)
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q_delay_interval = Q(datetime_submitted__lt=datetime.now()-timedelta(seconds=REPLICATION_DELAY))
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for document_queue in DocumentQueue.objects.filter(state=DOCUMENTQUEUE_STATE_ACTIVE):
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logger.debug('Analysing queue: %s' % document_queue)
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if QueueDocument.objects.filter(
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state=QUEUEDOCUMENT_STATE_PROCESSING).filter(
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node_name=platform.node()).count() < NODE_CONCURRENT_EXECUTION:
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try:
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oldest_queued_document_qs = document_queue.queuedocument_set.filter(
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(q_pending & ~q_delayed) | (q_pending & q_delayed & q_delay_interval))
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if oldest_queued_document_qs:
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oldest_queued_document = oldest_queued_document_qs.order_by('datetime_submitted')[0]
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task_process_queue_document.delay(oldest_queued_document.id)
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except Exception, e:
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print 'DocumentQueueWatcher exception: %s' % e
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return True
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