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Easy Webhooks for Python

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instance-based events

It would be useful if subscribers could receive events only related to a specific instance.

Scenario:

A web application lets users create their own AddressBook. Each AddressBook have many Contacts:

class AddressBook(models.Model):
    user = models.ForeignKey('auth.User')

@webhook_model(
    on_create=ModelEvent('contact.created'),
)
class Contact(models.Model):
    name = models.CharField(max_length=255)
    address_book = models.ForeignKey(AddressBook, related_name='contacts')

There doesn't seem to be a way for a subscriber to receive contact.created events only for Contacts of a specific AddressBook.

I see some indicators that this project may no longer be maintained. I am considering incorporating this into our code base and I wanted to know if it would be possible to get some sort of confirmation from Robinhood that there is an intention to maintain this project over the long term.

Any comment from Robinhood on this would be greatly appreciated.

Tagging @ask due to status of largest contributor and apparent status of current staff at Robinhood.

is there any ways to format values with just one line?

I've get the sql command like insert a(k,k,k) values (a,a,a),(b,b,b),(c,c,c);

Once I formatted the sql commands, it ran out

insert into
  a (
    k,
    k,
    k
  )
values
  (
    a,
    a,
    a
  ),
  (
    b,
    b,
    b
  );

is there anyways to format the commands to

insert into a(k,k,k) values
(a,a,a),
(b,b,b);

Change THORN_DISPATCHER during runtime

I'm working on writing some unit / integration tests for our webhook system and was wondering if there is a way to change the THORN_DISPATCHER setting during individual tests. or maybe just "reload" thorn somehow. My goal is to disable thorn during testing and then turn it on again for specific tests.

Typically I would just do this with something like:

    def setUp(self):
        settings.THORN_DISPATCHER = 'celery'

    def tearDown(self):
        settings.THORN_DISPATCHER = 'disabled'

But when I do this it looks like it still uses the default settings that were originally set. I think think this is because of the cached_property usage.

I looked through the thorn tests and couldn't find anything that resembled this and the google didn't seem very helpful...

Contributing to Thorn in README.md leads to page not found error.

Enable callback functions for the Celery dispatcher

The on_success, on_error and on_timeout callbacks are really useful (e.g. I intend to use them to store/show recent webhook deliveries to the customers, same way GitHub does).

I think it would be safe to enable them for the celery dispatcher if we look at Python's what can be pickled list:

functions defined at the top level of a module
built-in functions defined at the top level of a module
classes that are defined at the top level of a module
instances of such classes whose dict or the result of calling getstate() is picklable

I've done it myself and it's working fine, I've also fixed the corresponding tests (see the commit below). Would you consider merging the branch?

Thank you for your work!

git tags for v1.5.1 and v1.5.2 missing from the repo

Generator expression must be parenthesized

I am currently using python 3.8, Django 3.0.2 thorn 1.5.2 in Arch Linux. When I try to import thorn to my script it returns following error:

Traceback (most recent call last):
  File "authbot.py", line 10, in <module>
    from thorn import ModelEvent, webhook_model
  File "/home/yorozuya3/Desktop/authtelegrambot/env/lib/python3.8/site-packages/thorn/__init__.py", line 9, in <module>
    from .events import Event, ModelEvent
  File "/home/yorozuya3/Desktop/authtelegrambot/env/lib/python3.8/site-packages/thorn/events.py", line 282
    '__now_' in k for k in keys(self.filter_fields),
    ^
SyntaxError: Generator expression must be parenthesized

Filtering Subscriptions - Sender Field

Hi,
I've looked at issue #7 and I'm not sure if it solves my issue, or if my case is more complex.

Given entities Transport Order, Company, User and Application.

A Transport Order is created by and "belongs to" a Producer Company. It is consumed by Consumer Companies. It maintains a m2m "consumers" relationship with companies.
Users are employees of the companies
Consumer companies only wish to be notified about updates/ deletes to Transport Orders they consume.
Applications are OAuth apps created by developers, to act on behalf of Users.

Ideal Flow

Application on behalf of an employee of a consumer company registers a subscription to transport_order.change.
Producer company edits an order consumed by the consumer company
Consumer company's webhook is hit by the change, and not with changes to orders it does not subscribe to.

I don't think the sender_field is advanced enough to handle this, but hopefully I'm wrong?

Customizable webhook headers

Currently, it's possible to customize the payload sent by using webhook_payload.

I think it could be useful to add a way to customize headers as well. It would allow, for example, to include an Authorize header so that the receiving endpoint could associate the event to a user (eg a 'system' user with admin permission).

This could be implemented as either as webhook_header in the model (that'd be my favorite option), or even just some kind of global settings.

If this is something you think it's useful, I can work on a PR.

Ordering guarantees

Hi,
Great stuff! 👍

I didn't see any info in the documentation regarding ordering guarantees of posting callbacks (in success and failure scenarios).

Could you please elaborate?

Thanks!
Erik.

Release a new version supporting Django 2.0

Looks like support for Django 2.0 was added on on Dec 4, 2017 (in 5c89851#diff-354f30a63fb0907d4ad57269548329e3), but it was never released on PyPI.

Would it possible to have a new release? Are there any blockers?

Remove unique_together (url, event) constraint

We'd like to have more than one subscription to the same event/URL combination.

I tried to remove the constraint in #24 and it seems to pass the test suite. So it's not actually assumed anywhere in the code.

Celery dispatcher does not set custom headers

Problem

Celery dispatcher does not set custom HTTP headers for webhook requests.

I am pretty sure the headers are being dropped because they are not included in the returned dict when the Request.as_dict method is called from here

I propose to ensure that Request.as_dict returns the existing dict, but with the request instances headers (_headers) included. If this seems like a reasonable solution please let me know and I'll get a PR submitted.

Environment

thorn 1.5.0

Local dispatcher error handlers don't work

Using the local dispatcher (THORN_DISPATCHER = 'default'), not the Celery-based one, if the webhook raises an error (e.g. due to a timeout), the on_timeout and on_error handlers passed to send() aren't called. Instead the following internal error is raised:

  File "thorn/events.py", line 124, in send
    timeout=timeout, on_timeout=on_timeout,
  File "thorn/events.py", line 146, in _send
    allow_keepalive=self.allow_keepalive,
  File "thorn/dispatch/base.py", line 73, in send
    **kwargs
  File "vine/synchronization.py", line 57, in __init__
    [self.add_noincr(p) for p in promises or []]
  File "vine/synchronization.py", line 57, in <listcomp>
    [self.add_noincr(p) for p in promises or []]
  File "vine/synchronization.py", line 82, in add_noincr
    p.then(self)
AttributeError: 'NoneType' object has no attribute 'then'

I fixed (?) this with the following patch, although I am very unsure if it's correct. jonashaag@15453b2

Test case:

import django; django.setup()

import thorn
import thorn.django.models

thorn.django.models.Subscriber.objects.create(event='foo.*', url='http://8.8.8.8')

e = thorn.Event('foo.bar')
e.send({})

With my fix (?):

Traceback (most recent call last):
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/connection.py", line 141, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/util/connection.py", line 83, in create_connection
    raise err
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/util/connection.py", line 73, in create_connection
    sock.connect(sa)
socket.timeout: timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/connectionpool.py", line 601, in urlopen
    chunked=chunked)
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/connectionpool.py", line 357, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/connection.py", line 166, in connect
    conn = self._new_conn()
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/connection.py", line 146, in _new_conn
    (self.host, self.timeout))
urllib3.exceptions.ConnectTimeoutError: (<urllib3.connection.HTTPConnection object at 0x10faddda0>, 'Connection to 8.8.8.8 timed out. (connect timeout=1)')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "thorn/env3/lib/python3.6/site-packages/requests-2.18.4-py3.6.egg/requests/adapters.py", line 440, in send
    timeout=timeout
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/connectionpool.py", line 639, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "thorn/env3/lib/python3.6/site-packages/urllib3-1.22-py3.6.egg/urllib3/util/retry.py", line 388, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='8.8.8.8', port=80): Max retries exceeded with url: / (Caused by ConnectTimeoutError(<urllib3.connection.HTTPConnection object at 0x10faddda0>, 'Connection to 8.8.8.8 timed out. (connect timeout=1)'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 9, in <module>
    e.send({})
  File "thorn/thorn/events.py", line 124, in send
    timeout=timeout, on_timeout=on_timeout,
  File "thorn/thorn/events.py", line 146, in _send
    allow_keepalive=self.allow_keepalive,
  File "thorn/thorn/dispatch/base.py", line 73, in send
    **kwargs
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/synchronization.py", line 57, in __init__
    [self.add_noincr(p) for p in promises or []]
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/synchronization.py", line 57, in <listcomp>
    [self.add_noincr(p) for p in promises or []]
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/synchronization.py", line 82, in add_noincr
    p.then(self)
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/abstract.py", line 53, in then
    return self._p.then(on_success, on_error)
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/promises.py", line 173, in then
    callback.throw(self.reason)
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/synchronization.py", line 94, in throw
    self.p.throw(*args, **kwargs)
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/promises.py", line 217, in throw
    reraise(type(exc), exc, tb)
  File "thorn/env3/lib/python3.6/site-packages/vine-1.1.4-py3.6.egg/vine/five.py", line 178, in reraise
    raise value.with_traceback(tb)
requests.exceptions.ConnectTimeout: HTTPConnectionPool(host='8.8.8.8', port=80): Max retries exceeded with url: / (Caused by ConnectTimeoutError(<urllib3.connection.HTTPConnection object at 0x10faddda0>, 'Connection to 8.8.8.8 timed out. (connect timeout=1)'))

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