Motivation:
- Currently we have 2 seperate monkey patches in place for tracking
enqueded time for 2 seperate workers. It seems that activejob could be
a source of truth for how long an item has been enqued so that we can
easily use it for consistent monitoring across workers/apps to ensure
that jobs are running at an acceptable speed.
Changes:
- Add an enqueded at attribute and serilization tooling.
- Add a method to get how long a job has been enqueded for.
- Add a logging item to show how long a job was enqued prior to the
perform method firing.
When a job was just deserialized `arguments` is `nil` and the serialized
arguments are in the `@serialized_arguments` variable. If we try to
serialize this job again the arguments are going to be `nil` instead of
what was serialized.
The test we had was not checking this case because it was deserializing
the job in the same object that had the arguments.
To fix this, when the `@serialized_arguments` are present we return it
instead of the result of the `arguments` serialized.
Record what was the current timezone in effect when the job was
enqueued and then restore when the job is executed in same way
that the current locale is recorded and restored.
Placing non-native JSON data types, like symbols, in the hash to serialize means that the deserialize method will return something different from what was serialized, a common bug and source of frustration for devs.
When `#perform_later` is called the locale isn't stored on the
queue, which results in a locale reset when the job is performed.
An example of the problem:
I18n.locale = 'de'
HelloJob.perform_now # german message, correct
but
I18n.locale = 'de'
HelloJob.perform_later # english message, incorrect
This PR attaches the current I18n.locale to every job during the
serialization process. It is then restored during deserialization
and used to perform the job with the correct locale.
It falls back to the default locale if no serialized locale is
found in order to provide backward compatibility with previously
stored jobs. It is not necessary to clear the queue for the update.
