[asterisk-bugs] [JIRA] (ASTERISK-20880) Add channel caching to event subsystem

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-20880:
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             Summary: Add channel caching to event subsystem
                 Key: ASTERISK-20880
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20880
             Project: Asterisk
          Issue Type: New Feature
          Components: Core/Stasis
            Reporter: Matt Jordan


Elements built on top of Stasis-Core will need to subscribe for changes in the channel state and be able to query for a channel's current state. While Stasis-Core may eventually be a separate module/subsystem, for now it makes sense to build the functionality on top of the existing event pub/sub system.

There are a couple of 'requirements' that a solution should meet:
# {{ast_channel}} objects should not be passed directly. Events being raised should not affect the lifetime of the channel object and should not provide direct access to the {{ast_channel}} object, but should instead pass a copy of the necessary information. This helps keep event consumers thread-safe.
# The channel information passed by the event subsystem does not have to be all information contained in a channel, but should carry the name, unique ID, state, and other information likely to change on a channel.
# Alternatively, a key/value pair mechanism containing the updated parameters of the channel can be passed (using either {{ast_variable}} or typed tuples, as prototyped on https://reviewboard.asterisk.org/r/2248/

As an initial candidate of consuming this information, AMI should be refactored to subscribe for channel state updates and send the event based on this information. The existing {{Newstate}} event should be refactored into manager.c and built on top of this information.

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