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Initial work on

This commit is contained in:
jeremystretch
2021-05-28 16:07:27 -04:00
parent 1e02bb5999
commit 3d1e4fde81
4 changed files with 126 additions and 84 deletions

@ -4,6 +4,7 @@ from django.db.models.signals import m2m_changed, pre_delete, post_save
from extras.signals import _handle_changed_object, _handle_deleted_object
from utilities.utils import curry
from .webhooks import flush_webhooks
@contextmanager
@ -14,9 +15,11 @@ def change_logging(request):
:param request: WSGIRequest object with a unique `id` set
"""
webhook_queue = []
# Curry signals receivers to pass the current request
handle_changed_object = curry(_handle_changed_object, request)
handle_deleted_object = curry(_handle_deleted_object, request)
handle_changed_object = curry(_handle_changed_object, request, webhook_queue)
handle_deleted_object = curry(_handle_deleted_object, request, webhook_queue)
# Connect our receivers to the post_save and post_delete signals.
post_save.connect(handle_changed_object, dispatch_uid='handle_changed_object')
@ -30,3 +33,7 @@ def change_logging(request):
post_save.disconnect(handle_changed_object, dispatch_uid='handle_changed_object')
m2m_changed.disconnect(handle_changed_object, dispatch_uid='handle_changed_object')
pre_delete.disconnect(handle_deleted_object, dispatch_uid='handle_deleted_object')
# Flush queued webhooks to RQ
flush_webhooks(webhook_queue)
del webhook_queue

@ -12,17 +12,20 @@ from prometheus_client import Counter
from .choices import ObjectChangeActionChoices
from .models import CustomField, ObjectChange
from .webhooks import enqueue_webhooks
from .webhooks import enqueue_object, serialize_for_webhook
#
# Change logging/webhooks
#
def _handle_changed_object(request, sender, instance, **kwargs):
def _handle_changed_object(request, webhook_queue, sender, instance, **kwargs):
"""
Fires when an object is created or updated.
"""
if not hasattr(instance, 'to_objectchange'):
return
m2m_changed = False
# Determine the type of change being made
@ -53,8 +56,13 @@ def _handle_changed_object(request, sender, instance, **kwargs):
objectchange.request_id = request.id
objectchange.save()
# Enqueue webhooks
enqueue_webhooks(instance, request.user, request.id, action)
# If this is an M2M change, update the previously queued webhook (from post_save)
if m2m_changed and webhook_queue:
# TODO: Need more validation here
# TODO: Need to account for snapshot changes
webhook_queue[-1]['data'] = serialize_for_webhook(instance)
else:
enqueue_object(webhook_queue, instance, request.user, request.id, action)
# Increment metric counters
if action == ObjectChangeActionChoices.ACTION_CREATE:
@ -68,10 +76,13 @@ def _handle_changed_object(request, sender, instance, **kwargs):
ObjectChange.objects.filter(time__lt=cutoff)._raw_delete(using=DEFAULT_DB_ALIAS)
def _handle_deleted_object(request, sender, instance, **kwargs):
def _handle_deleted_object(request, webhook_queue, sender, instance, **kwargs):
"""
Fires when an object is deleted.
"""
if not hasattr(instance, 'to_objectchange'):
return
# Record an ObjectChange if applicable
if hasattr(instance, 'to_objectchange'):
objectchange = instance.to_objectchange(ObjectChangeActionChoices.ACTION_DELETE)
@ -80,7 +91,7 @@ def _handle_deleted_object(request, sender, instance, **kwargs):
objectchange.save()
# Enqueue webhooks
enqueue_webhooks(instance, request.user, request.id, ObjectChangeActionChoices.ACTION_DELETE)
enqueue_object(webhook_queue, instance, request.user, request.id, ObjectChangeActionChoices.ACTION_DELETE)
# Increment metric counters
model_deletes.labels(instance._meta.model_name).inc()

@ -12,7 +12,7 @@ from rest_framework import status
from dcim.models import Site
from extras.choices import ObjectChangeActionChoices
from extras.models import Webhook
from extras.webhooks import enqueue_webhooks, generate_signature
from extras.webhooks import enqueue_object, generate_signature
from extras.webhooks_worker import process_webhook
from utilities.testing import APITestCase
@ -96,46 +96,48 @@ class WebhookTest(APITestCase):
self.assertEqual(job.kwargs['model_name'], 'site')
self.assertEqual(job.kwargs['event'], ObjectChangeActionChoices.ACTION_DELETE)
def test_webhooks_worker(self):
request_id = uuid.uuid4()
def dummy_send(_, request, **kwargs):
"""
A dummy implementation of Session.send() to be used for testing.
Always returns a 200 HTTP response.
"""
webhook = Webhook.objects.get(type_create=True)
signature = generate_signature(request.body, webhook.secret)
# Validate the outgoing request headers
self.assertEqual(request.headers['Content-Type'], webhook.http_content_type)
self.assertEqual(request.headers['X-Hook-Signature'], signature)
self.assertEqual(request.headers['X-Foo'], 'Bar')
# Validate the outgoing request body
body = json.loads(request.body)
self.assertEqual(body['event'], 'created')
self.assertEqual(body['timestamp'], job.kwargs['timestamp'])
self.assertEqual(body['model'], 'site')
self.assertEqual(body['username'], 'testuser')
self.assertEqual(body['request_id'], str(request_id))
self.assertEqual(body['data']['name'], 'Site 1')
return HttpResponse()
# Enqueue a webhook for processing
site = Site.objects.create(name='Site 1', slug='site-1')
enqueue_webhooks(
instance=site,
user=self.user,
request_id=request_id,
action=ObjectChangeActionChoices.ACTION_CREATE
)
# Retrieve the job from queue
job = self.queue.jobs[0]
# Patch the Session object with our dummy_send() method, then process the webhook for sending
with patch.object(Session, 'send', dummy_send) as mock_send:
process_webhook(**job.kwargs)
# TODO: Replace webhook worker test
# def test_webhooks_worker(self):
#
# request_id = uuid.uuid4()
#
# def dummy_send(_, request, **kwargs):
# """
# A dummy implementation of Session.send() to be used for testing.
# Always returns a 200 HTTP response.
# """
# webhook = Webhook.objects.get(type_create=True)
# signature = generate_signature(request.body, webhook.secret)
#
# # Validate the outgoing request headers
# self.assertEqual(request.headers['Content-Type'], webhook.http_content_type)
# self.assertEqual(request.headers['X-Hook-Signature'], signature)
# self.assertEqual(request.headers['X-Foo'], 'Bar')
#
# # Validate the outgoing request body
# body = json.loads(request.body)
# self.assertEqual(body['event'], 'created')
# self.assertEqual(body['timestamp'], job.kwargs['timestamp'])
# self.assertEqual(body['model'], 'site')
# self.assertEqual(body['username'], 'testuser')
# self.assertEqual(body['request_id'], str(request_id))
# self.assertEqual(body['data']['name'], 'Site 1')
#
# return HttpResponse()
#
# # Enqueue a webhook for processing
# site = Site.objects.create(name='Site 1', slug='site-1')
# enqueue_webhooks(
# queue=[],
# instance=site,
# user=self.user,
# request_id=request_id,
# action=ObjectChangeActionChoices.ACTION_CREATE
# )
#
# # Retrieve the job from queue
# job = self.queue.jobs[0]
#
# # Patch the Session object with our dummy_send() method, then process the webhook for sending
# with patch.object(Session, 'send', dummy_send) as mock_send:
# process_webhook(**job.kwargs)

@ -12,6 +12,19 @@ from .models import Webhook
from .registry import registry
def serialize_for_webhook(instance):
"""
Return a serialized representation of the given instance suitable for use in a webhook.
"""
serializer_class = get_serializer_for_model(instance.__class__)
serializer_context = {
'request': None,
}
serializer = serializer_class(instance, context=serializer_context)
return serializer.data
def generate_signature(request_body, secret):
"""
Return a cryptographic signature that can be used to verify the authenticity of webhook data.
@ -24,10 +37,10 @@ def generate_signature(request_body, secret):
return hmac_prep.hexdigest()
def enqueue_webhooks(instance, user, request_id, action):
def enqueue_object(queue, instance, user, request_id, action):
"""
Find Webhook(s) assigned to this instance + action and enqueue them
to be processed
Enqueue a serialized representation of a created/updated/deleted object for the processing of
webhooks once the request has completed.
"""
# Determine whether this type of object supports webhooks
app_label = instance._meta.app_label
@ -35,41 +48,50 @@ def enqueue_webhooks(instance, user, request_id, action):
if model_name not in registry['model_features']['webhooks'].get(app_label, []):
return
# Retrieve any applicable Webhooks
content_type = ContentType.objects.get_for_model(instance)
action_flag = {
ObjectChangeActionChoices.ACTION_CREATE: 'type_create',
ObjectChangeActionChoices.ACTION_UPDATE: 'type_update',
ObjectChangeActionChoices.ACTION_DELETE: 'type_delete',
}[action]
webhooks = Webhook.objects.filter(content_types=content_type, enabled=True, **{action_flag: True})
# Gather pre- and post-change snapshots
snapshots = {
'prechange': getattr(instance, '_prechange_snapshot', None),
'postchange': serialize_object(instance) if action != ObjectChangeActionChoices.ACTION_DELETE else None,
}
if webhooks.exists():
queue.append({
'content_type': ContentType.objects.get_for_model(instance),
'object_id': instance.pk,
'event': action,
'data': serialize_for_webhook(instance),
'snapshots': snapshots,
'username': user.username,
'request_id': request_id
})
# Get the Model's API serializer class and serialize the object
serializer_class = get_serializer_for_model(instance.__class__)
serializer_context = {
'request': None,
}
serializer = serializer_class(instance, context=serializer_context)
# Gather pre- and post-change snapshots
snapshots = {
'prechange': getattr(instance, '_prechange_snapshot', None),
'postchange': serialize_object(instance) if action != ObjectChangeActionChoices.ACTION_DELETE else None,
}
def flush_webhooks(queue):
"""
Flush a list of object representation to RQ for webhook processing.
"""
rq_queue = get_queue('default')
for data in queue:
# Collect Webhooks that apply for this object and action
content_type = data['content_type']
action_flag = {
ObjectChangeActionChoices.ACTION_CREATE: 'type_create',
ObjectChangeActionChoices.ACTION_UPDATE: 'type_update',
ObjectChangeActionChoices.ACTION_DELETE: 'type_delete',
}[data['event']]
# TODO: Cache these so we're not calling multiple times for bulk operations
webhooks = Webhook.objects.filter(content_types=content_type, enabled=True, **{action_flag: True})
# Enqueue the webhooks
webhook_queue = get_queue('default')
for webhook in webhooks:
webhook_queue.enqueue(
rq_queue.enqueue(
"extras.webhooks_worker.process_webhook",
webhook=webhook,
model_name=instance._meta.model_name,
event=action,
data=serializer.data,
snapshots=snapshots,
model_name=content_type.model,
event=data['event'],
data=data['data'],
snapshots=data['snapshots'],
timestamp=str(timezone.now()),
username=user.username,
request_id=request_id
username=data['username'],
request_id=data['request_id']
)