Commits on Jul 3, 2017

1. Enh: implemented transparent update …

   This patch implements transparent update. It prevents downtimes or void
   results each time a new configuration is pushed.
   
   The deleted objects state is saved when new initial Broks are sent by a
   scheduler. Queries get executed from this saved state until new objects are
   fully loaded. Once done, the old state is erased, and queries are made
   from latest objects state.
   
   To enable transparent update, set the `transparent_update` parameter to
   `1` in the livestatus configuration:
   
       define module {
           module_name        Livestatus
           module_type        livestatus
           port               50000
           ...
           transparent_update 1
           ...
       }
   
   Also:
   
   - Fixed a bug in `itersorted` bound method in regenerator class that crashed
     livestatus when a query was made during objects reloading. If an id could
     not be found, return a void list rather than crashing the whole module.
   - Set a null `__itersorted__` method at initialization to avoid ugly
     `object has no attribute '__itersorted__'` exceptions when service
     starts.
   - Re-indented some (very) long and difficult to read list comprehensions

   

   geektophe committed Jul 3, 2017
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