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33 lines
1.4 KiB
Python
33 lines
1.4 KiB
Python
import uuid
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from .context_managers import change_logging
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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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# 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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# Process the request with change logging enabled
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with change_logging(request):
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response = self.get_response(request)
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return response
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