On pátek 16. prosince 2016 16:28:47 CET Daniel Kuffner wrote:
> Hi All,
>
> I was looking for a simple example of how to use locks of foreman-tasks
> (dynflow). I can see that Actions::EntryAction mixes in the
> Actions::Helpers::Lock but for me it is not clear how to use it.
>
> regards,
> Daniel
Hello,
there are two types of locks - exclusive (blocking other tasks to lock the
same resource) and non-exclusive also called links. To automatically create
link to some object, you only define related_resource method in your task
def related_resources
[ ::Host.first ]
end
As you can see, it should return array of linked objects, first host in this
case.
To create a lock you need to first defined what locks are available for a
given task, e.g.
# names of locks that can be locked
def available_locks
[ :read, :write ]
end
When the task has this defined you can lock resources in planning like this
# locking only in plan phase
def plan(params)
lock!(::FactValue.first, :read)
# exclusive_lock!(::Host.last) # locks all available locks on a given
resource
link!(::FactValue.last) # this would add link lock
plan_self :params => params
end
# exclusive_lock! and lock! creates the same kind of lock,
exclusive_lock! just locks all available locks
I'm in the middle of writing the manual for the foreman-tasks plugin. When I
finish user guide, I'll send a PR so others can contribute. I also plan to put
together developer guide which would cover this.
Hope this helps
--
Marek
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