cogniteev / backache / 50

97%

Pull #4

travis-ci

Error handling implementation

Update operation tasks API when used with Celery:

* They can now have `kwargs` arguments.
* Operations are given a context that now provides 2 additional methods:
  * `retry`: to retry the task later. Optional arguments can be specified:
    * countdown: to retry the task later
    * **kwargs: `kwargs` that will be given to the retried task.
  * `quarantine`: to move the task in a dedicated queue for further
    investigation by humans.

Those 2 methods raise custom exceptions known by backache.
Now, if an operation task raises something else than
`ProcessingRetryException` then the task is evicted and quarantined.

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