Basically, I don't want to enforce users to configure _any_ logging
stack when writing a basic worker, like this:
from rq import Worker, Queue, Connection
with Connection():
q = Queue()
w = Worker([q])
w.work(burst=True)
In case you want to disable logging altogether, you can configure your
logging stack to do so.
When a pickled job string can't be unpickled because some required
module isn't loadable, this leads to an `UnpickleError` in the worker
(not in the horse).
Currently we just assume "garbage" in the job's data field, and silently
ignore it.
This is bad.
Really bad.
Because it avoids the normal exception handling mechanism that RQ has.
Historically, this "feature" was introduced to ignore any invalid pickle
data ("bad strings") on queues, and go on. However, we must assume data
inside `job.data` to be valid pickle data.
While an invalid _format_ of pickle data (e.g. the string "blablah"
isn't valid) leads to unpickle errors, unpickling errors will also occur
when the job can't be validly constructed in memory for other reasons,
like being unable to load a specific class.
Django is a good example of this: try submitting jobs that use
`django.conf.settings` while the `DJANGO_SETTINGS_MODULE` env var isn't
set. Currently, RQ workers will drop these jobs and dismiss them like
any non-valid pickle data. You won't be notified.
This patch changes RQ's behaviour to never ignore invalid string data on
any queue and _always_ handle these errors explicitly (but without
bringing the main loop down, of course).
redis-py now supports URL-based connection configuration. When --url
is specified, we use it to construct the Redis object. Otherwise, we
use the existing argument-based construction method.
`Redis.from_url()` is new in redis-py 2.6.2, so that prerequisite has
been adjusted accordingly.