Allow plugins to initialize at server startup

[kylethedude]

Added the ability for a plugin to specify an initialization routine that is only executed when the SiriProxy server is started. This provides the plugin a mechanism to perform a task that is not required to be performed upon every connection. This is an optional feature, so existing plugins won't break.

Usage

1. Plugin defines a function called "plugin_init" to be called once when the server is started.

def plugin_init
  init_data = Hash.new

   # dynamically collect info into "init_data" 

   return init_data
end

1. Function "plugin_init" should return initialization data to be used on future connections.
2. In plugin "initialize" (constructor) function, plugin can access saved initialization data from passed "config" hash.

def initialize(config)
    if (config.has_key?("init"))
        # plugin has been initialized, use config['init'] to access "init_data"
    else
        # plugin is being called on server start
    end
end

Usefulness

• For plugins that require processing time to dynamically collect static data (information about a home automation system, for example)

[elvisimprsntr]

+1 on this.

[elvisimprsntr]

This will help reduce init times of my redeye plugin which has to pull in 100s of variables.

[kylethedude]

I agree that duplicating code is sloppy, so I've revised my approach.

[plamoni]

Looks good!