Implement Manager with API for Conversion Jobs

Created by: ghost

Job Issuer (Manager) using RQ.

General:

• [ ] use (self-signed) https (see #256 (closed) )

Support for callbacks from web:

• token auth for requester/JWT?
• GET request for available conversion formats
• POST for new conversion job
  • accepts callback of arbitrary url (string)
  • accepts conversion formats
  • boundaries
• on status change from worker, use callback to signal change of status
  • [ ] send url for status query as payload (see #257 (closed) )
• status query service
  • <manager_host>/api/conversion_result/<job_id>/ (only get)
  • payload:
    • status of respective job
    • if error status, error message
    • if success status, file retrieval
    • deletion URL (see 'file delivery service' below)
    • (no extra payload if status 'aborted')
    • if 'in progress' status: optional progress information (step x of y)
• file delivery service
  • <manager_host>/api/gis_format/<job_id>/result_file/ (GET)
  • <manager_host>/api/gis_format/<job_id>/result_file/ (DELETE)
• common data only container with worker

Removal of files:

• deleting files is handled through calling DELETE (http-verb) on <manager_host>/api/job/<job_id>/file
• if limit of x files (e.g. 100) has been reached, the oldest are deleted (never keep more than x files)