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60 lines
2.0 KiB
ReStructuredText
60 lines
2.0 KiB
ReStructuredText
=================
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Salt Event System
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=================
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Salt 0.9.10 introduced the Salt Event System. This system is used to fire
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off events enabling third party applications or external processes to react
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to behavior within Salt.
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The event system is comprised of a few components, the event sockets which
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publish events, and the event library which can listen to events and send
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events into the salt system.
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Listening for Events
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====================
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The event system is accessed via the event library and can only be accessed
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by the same system user that Salt is running as. To listen to events a
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SaltEvent object needs to be created and then the get_event function needs to
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be run. The SaltEvent object needs to know the location that the Salt unix
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sockets are kept. In the configuration this is the ``sock_dir`` option. The
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``sock_dir`` option defaults to "/var/run/salt" on most systems.
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The following code will check for a single event:
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.. code-block:: python
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import salt.utils.event
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event = salt.utils.event.MasterEvent('/var/run/salt')
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data = event.get_event()
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Events will also use a "tag". A "tag" allows for events to be filtered. By
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default all events will be returned, but if only authentication events are
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desired, then pass the tag "auth". Also, the get_event method has a default
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poll time assigned of 5 seconds, to change this time set the "wait" option.
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This example will only listen for auth events and will wait for 10 seconds
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instead of the default 5.
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.. code-block:: python
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import salt.utils.event
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event = salt.utils.event.MasterEvent('/var/run/salt')
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data = event.get_event(wait=10, tag='auth')
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Instead of looking for a single event, the iter_events method can be used to
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make a generator which will continually yield salt events. The iter_events
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method also accepts a tag, but not a wait time:
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.. code-block:: python
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import salt.utils.event
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event = salt.utils.event.MasterEvent('/var/run/salt')
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for data in event.iter_events(tag='auth'):
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print(data)
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