Class: Discotheque::Discover

Inherits:
Object
  • Object
show all
Defined in:
lib/discotheque/discover.rb

Constant Summary collapse

VALID_FILTERS =

NOTE tags are not available via metadata calls therefore tag will need to be an explcit value passed in This actually makes sense if you want to discover a tag that isn’t yours Take the use case of a master/slave setup: You would tag the master node with “foo_slave” but you might need to find all slaves

%w[az sg tag ami arch]
FILTER_MAP = 
{"az" => "availability-zone",
"sg" => "group-name",
"ami" => "image-id",
"arch" => "architecture"}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filters = []) ⇒ Discover

Returns a new instance of Discover.



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# File 'lib/discotheque/discover.rb', line 19

def initialize(filters=[])
  @filters = filters
end

Instance Attribute Details

#filters ⇒ Object

Returns the value of attribute filters.



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# File 'lib/discotheque/discover.rb', line 17

def filters
  @filters
end

Instance Method Details

#clear_filters ⇒ Object 



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# File 'lib/discotheque/discover.rb', line 36

def clear_filters
  @filters = []
end

#get_nodes(creds = {}) ⇒ Object 



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# File 'lib/discotheque/discover.rb', line 23

def get_nodes(creds={})
  # creds is a hash like so
  # creds = {:access_key_id => "YYYYYYYYYYYYYYYYYYYYYYYYYY", :secret_access_key => "XXXXXXXXXXXXX"}
  @filters.empty? ? f="ec2.instances" : f="ec2.instances.#{build_filter}"
  require 'aws-sdk'
  AWS.config creds
  ec2 = AWS::EC2.new
  candidates = AWS.memoize do
    ci = eval(f)
    ci.to_a.sort_by(&:ip_address).map {|i| i.ip_address}
  end
end