Revision 38d5464c

b/Changelog
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Astakos
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* Redesign of the accounting system (quotaholder) and integration into
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astakos.
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  * Simplified the quotaholder model; removed tables Entity and Policy; now
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    table Holding contains limit and usage for every holding.
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  * Extended table Holding, so that we can keep track of quota for every
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    valid combination of holder (e.g. user), resource, and source (e.g. the
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    default system or some specific project).
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  * Refactored code for issuing and resolving commissions for robustness;
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    added a 'force' option to bypass the upper limit check when issuing a
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    commission.
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  * Simplified syncing to the quotaholder; removed fields from models
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    Project and ProjectMembership, previously needed for syncing; removed
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    state PROJECT_DEACTIVATED from ProjectMembership.
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* Service and resource specification and handling:
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  * Specified a format for defining resources a service exposes. Migrated
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    internal resource name by prefixing it with service name (e.g. 'vm'
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    becomes 'cyclades.vm'); renamed registered service 'pithos+' to
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    'pithos'.
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  * Specified a procedure to register a service's resources in astakos and
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    set their respective default base quota limit. Removed resource
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    definitions from settings.
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  * Moved service and resource presentation data out of the respective db
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    models into a separate file of UI constants.
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* Converted the limit on pending applications from a setting to a quotable
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  resource. Converted the related user setting to a user-specific base quota
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  limit. Deprecated model UserSetting; removed setting
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  ASTAKOS_PENDING_APPLICATION_LIMIT.
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* Changes in locking strategy:
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  * Lock only project's chain for all project operations; lock user before
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    syncing to quotaholder.
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  * When locking multiple rows (e.g. users or holdings) include an ORDER BY
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    clause in the query to impose ordering on locking.
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* API-related changes:
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 * Implemented API calls for quota, resources, and commissions.
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 * Moved all API calls under '/astakos/api'. Kept also previous locations
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   for backwards compatibility.
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* Changes in views:
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  * Replaced custom transaction context with a simple decorator for managing
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    transactions and a context 'ExceptionHandler', which logs and suppresses
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    exceptions
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* Management commands:
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  * Renamed command astakos-quota to quota; user-update to user-modify.
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  * Removed user-set-initial-quota; integrated its functionality in
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    user-modify and quota.
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  * Added quota and project-related information in user-show command; added
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    membership information in project-show.
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Cyclades
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