DEPRECATION WARNING: `#deliver` is deprecated and will be removed in Rails 5. Use `#deliver_now` to deliver immediately or `#deliver_later` to deliver through Active Job.
Removes use of #handle_asynchronously, which we need to do elsewhere. Fixes:
BulkInvoiceService#start_pdf_job starts a background process to create a pdf with multiple invoices
Failure/Error:
expect do
service.start_pdf_job [1, 2]
end.to enqueue_job Delayed::PerformableMethod
expected to enqueue exactly 1 jobs, but enqueued 0
# ./spec/services/bulk_invoice_service_spec.rb:8:in `block (3 levels) in <top (required)>'
There's a bunch of logging bits we need to find out what happened in
`#5294`, the first of which is logging as we are used to for Rails
itself. Turns out we were already logging but the log lines weren't
displayed.
That's because workers have no access to the Rails logger unless we hack
things a bit in the config/initializer. If we want to keep DJ's logs in
a different file, which I think is good for debugging purposes, we need
to diverge from Rails.logger.
However, there's no access to Delayed::Worker.logger in custom job
classes either so there's no way other than mimicking that logger's format
if we want log lines to be consistent.
Now the current logs will see the light like:
```
2020-05-07T14:09:42+0000: [Worker(host:8dc5e7e6f434 pid:1)] Job SubscriptionPlacementJob (id=54) RUNNING
2020-05-07T14:09:42+0000: Placing Order for Proxy Order 1
2020-05-07T14:09:42+0000: Issue in Subscription Order 2: complete
2020-05-07T14:09:42+0000: Placing Order for Proxy Order 7
2020-05-07T14:09:42+0000: Issue in Subscription Order 3: complete
2020-05-07T14:09:43+0000: [Worker(host:8dc5e7e6f434 pid:1)] Job SubscriptionPlacementJob (id=54) COMPLETED after 0.3378
2020-05-07T14:09:43+0000: [Worker(host:8dc5e7e6f434 pid:1)] 1 jobs processed at 2.8054 j/s, 0 failed
```
We'll see if we need to format these messages differently to make them
more greppeable.
This will allow us to see the difference between the cache entry and the
actual shopfront. Otherwise, there is no way to see what wasn't
refreshed in the cache.
