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127 lines
4.9 KiB
Python
127 lines
4.9 KiB
Python
import random
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import threading
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import uuid
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from datetime import timedelta
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from django.conf import settings
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from django.db.models.signals import post_delete, post_save
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from django.utils import timezone
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from django.utils.functional import curry
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from django_prometheus.models import model_deletes, model_inserts, model_updates
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from .constants import *
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from .models import ObjectChange
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from .signals import purge_changelog
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from .webhooks import enqueue_webhooks
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_thread_locals = threading.local()
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def handle_changed_object(sender, instance, **kwargs):
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"""
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Fires when an object is created or updated
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"""
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# Queue the object and a new ObjectChange for processing once the request completes
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if hasattr(instance, 'to_objectchange'):
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action = OBJECTCHANGE_ACTION_CREATE if kwargs['created'] else OBJECTCHANGE_ACTION_UPDATE
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objectchange = instance.to_objectchange(action)
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_thread_locals.changed_objects.append(
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(instance, objectchange)
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)
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def _handle_deleted_object(request, sender, instance, **kwargs):
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"""
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Fires when an object is deleted
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"""
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# Record an Object Change
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if hasattr(instance, 'to_objectchange'):
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objectchange = instance.to_objectchange(OBJECTCHANGE_ACTION_DELETE)
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objectchange.user = request.user
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objectchange.request_id = request.id
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objectchange.save()
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# Enqueue webhooks
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enqueue_webhooks(instance, request.user, request.id, OBJECTCHANGE_ACTION_DELETE)
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# Increment metric counters
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model_deletes.labels(instance._meta.model_name).inc()
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def purge_objectchange_cache(sender, **kwargs):
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"""
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Delete any queued object changes waiting to be written.
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"""
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_thread_locals.changed_objects = []
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class ObjectChangeMiddleware(object):
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"""
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This middleware performs three functions in response to an object being created, updated, or deleted:
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1. Create an ObjectChange to reflect the modification to the object in the changelog.
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2. Enqueue any relevant webhooks.
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3. Increment the metric counter for the event type.
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The post_save and post_delete signals are employed to catch object modifications, however changes are recorded a bit
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differently for each. Objects being saved are cached into thread-local storage for action *after* the response has
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completed. This ensures that serialization of the object is performed only after any related objects (e.g. tags)
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have been created. Conversely, deletions are acted upon immediately, so that the serialized representation of the
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object is recorded before it (and any related objects) are actually deleted from the database.
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"""
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def __init__(self, get_response):
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self.get_response = get_response
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def __call__(self, request):
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# Initialize an empty list to cache objects being saved.
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_thread_locals.changed_objects = []
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# Assign a random unique ID to the request. This will be used to associate multiple object changes made during
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# the same request.
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request.id = uuid.uuid4()
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# Signals don't include the request context, so we're currying it into the post_delete function ahead of time.
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handle_deleted_object = curry(_handle_deleted_object, request)
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# Connect our receivers to the post_save and post_delete signals.
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post_save.connect(handle_changed_object, dispatch_uid='cache_changed_object')
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post_delete.connect(handle_deleted_object, dispatch_uid='cache_deleted_object')
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# Provide a hook for purging the change cache
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purge_changelog.connect(purge_objectchange_cache)
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# Process the request
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response = self.get_response(request)
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# If the change cache is empty, there's nothing more we need to do.
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if not _thread_locals.changed_objects:
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return response
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# Create records for any cached objects that were created/updated.
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for obj, objectchange in _thread_locals.changed_objects:
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# Record the change
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objectchange.user = request.user
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objectchange.request_id = request.id
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objectchange.save()
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# Enqueue webhooks
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enqueue_webhooks(obj, request.user, request.id, objectchange.action)
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# Increment metric counters
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if objectchange.action == OBJECTCHANGE_ACTION_CREATE:
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model_inserts.labels(obj._meta.model_name).inc()
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elif objectchange.action == OBJECTCHANGE_ACTION_UPDATE:
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model_updates.labels(obj._meta.model_name).inc()
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# Housekeeping: 1% chance of clearing out expired ObjectChanges. This applies only to requests which result in
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# one or more changes being logged.
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if settings.CHANGELOG_RETENTION and random.randint(1, 100) == 1:
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cutoff = timezone.now() - timedelta(days=settings.CHANGELOG_RETENTION)
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purged_count, _ = ObjectChange.objects.filter(
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time__lt=cutoff
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).delete()
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return response
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