Hello Thierry,
You are talking about these data
managers: http://zodb.readthedocs.io/en/latest/transactions.html#data-managers
Correct? Other than the Mailer <https://github.com/Pylons/pyramid_mailer>
it seems a little difficult to find more verbose documentation?
I have played a little more with the after-commit hook and this short piece
of code seems to work:
@view_config(
…
)
def some_view(request):
# Do some view stuff, modify db objects, etc.
# Local helper function that issues the message to the broker. This
# function has access to the closure but beware that db objects are
# committed and invalid!
def _send_message(success, *args, **kwargs):
if success:
# Send message to the broker, thus spawning a worker task.
dramatiq_actors.some_task.send(*args) # Or Celery tasks,
whatever.
# Get the transaction for this request.
t = request.tm.get()
# Arguments for the task.
args = (
foo,
3,
)
kwargs = {}
# Add the after-commit hook, i.e. call _send_message() when the
# request's transaction has committed.
t.addAfterCommitHook(_send_message, args=args, kws=kwargs)
# And return from the view function.
return {
"some": "results",
}
It looks to me that this is an acceptable solution if the called hook
function can not fail (i.e. return success/failure) and therewith can not
contribute to the transaction to fail/succeed. However, a data manager
solution makes sense if data must be managed and processing/persisting that
data may fail which impacts the overall transaction.
Any recommendations here?
Cheers,
Jens
On Friday, June 1, 2018 at 5:06:35 PM UTC+10, Thierry Florac wrote:
>
> Hi,
> Maybe you should have a look at the "DataManager" component interface
> provided by the "transaction" package.
> This kind of component allows you to include your hook in a "two-phase
> commit" transaction safely.
> Several implementations are available, for example in the
> "repoze.sendmail" package...
>
> Best regards,
> Thierry
>
>
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