58 lines
2.3 KiB
Python
58 lines
2.3 KiB
Python
from datetime import timedelta, datetime
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import platform
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import time
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import random
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from django.db.models import Q
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from celery.decorators import task, periodic_task
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from ocr.api import do_document_ocr
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from ocr.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 ocr.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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if queue_document.state == QUEUEDOCUMENT_STATE_PROCESSING:
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#Recheck to avoid race condition
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return
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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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@periodic_task(run_every=timedelta(seconds=15))
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def task_process_document_queues():
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#Introduce random 0 < t < 1 second delay to further reduce the
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#chance of a race condition
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time.sleep(random.random())
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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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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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