Class: RodeoClown::ELB

Inherits:
Struct
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/rodeo_clown/elb.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#elb ⇒ Object

Returns the value of attribute elb

Returns:

  • (Object) —

    the current value of elb



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# File 'lib/rodeo_clown/elb.rb', line 3

def elb
  @elb
end

Class Method Details

.by_name(name) ⇒ Object 



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# File 'lib/rodeo_clown/elb.rb', line 12

def self.by_name(name)
  new load_balancers[name]
end

.load_balancers ⇒ Object 



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# File 'lib/rodeo_clown/elb.rb', line 16

def self.load_balancers
  AWS::ELB.new.load_balancers
end

Instance Method Details

#deregister(ary_instances) ⇒ Object 



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# File 'lib/rodeo_clown/elb.rb', line 33

def deregister(ary_instances)
  ary_instances.each do |i|
    begin
      puts "...deregistering: #{i.id}"
      instances.deregister(i.id)
    rescue AWS::ELB::Errors::InvalidInstance
      puts "Instance #{i.id} currently not registered to load balancer"
    end
  end
end

#register_and_wait(new_instances) ⇒ Object 



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# File 'lib/rodeo_clown/elb.rb', line 20

def register_and_wait(new_instances)
  new_instances.each do |i|
    begin
      puts "...registering: #{i.id}"
      instances.register(i.id)
    rescue AWS::ELB::Errors::InvalidInstance
      puts "Instance #{i.id} could not be registered to load balancer"
    end
  end

  wait_for_state(instances, "InService")
end

#rotate(hsh) ⇒ Object

Rotate servers given



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# File 'lib/rodeo_clown/elb.rb', line 47

def rotate(hsh)
  current_ec2, new_ec2 = hsh.first

  cur_instances = EC2.by_tags("Name" => current_ec2.to_s)
  new_instances = EC2.by_tags("Name" => new_ec2.to_s)

  register_and_wait new_instances
  deregister        cur_instances
end

#timeout ⇒ Object 



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# File 'lib/rodeo_clown/elb.rb', line 5

def timeout
  @timeout ||= (ENV["TIMEOUT"] || 60).to_i
end

#wait_for_state(instances, exp_state) ⇒ Object

Wait for all the instances to become InService



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# File 'lib/rodeo_clown/elb.rb', line 60

def wait_for_state(instances, exp_state)

  time = 0
  all_good = false

  loop do
    all_good = instances.all? do |i|
      state = i.elb_health[:state] 
      puts "#{i.id}: #{state}"

      exp_state == state
    end

    break if all_good || time > timeout

    sleep 1
    time += 1
  end

  # If timeout before all inservice, deregister and raise error
  unless all_good
    raise "Instances are out of service"
  end
end