Class: CloudFormationTool::CLI::Scale

Inherits:
Clamp::Command
  • Object
show all
Includes:
CloudFormationTool
Defined in:
lib/cloud_formation_tool/cli/scale.rb

Constant Summary

Constants included from CloudFormationTool

VERSION

Instance Method Summary collapse

Methods included from CloudFormationTool

#aws_config, #awsas, #awscdn, #awscf, #awscreds, #awsec2, #awsecs, #awss3, #cf_bucket_name, #find_profile, #profile, #region, #s3_bucket_name

Instance Method Details

#execute ⇒ Object 



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# File 'lib/cloud_formation_tool/cli/scale.rb', line 24

def execute
  debug "Starting scale operations"
  st = CloudFormation::Stack.new(stack_name)
  st.asgroups.select do |res|
    debug "Checking group #{res.logical_resource_id}"
    asg_name.nil? or (res.logical_resource_id == asg_name)
  end.collect do |res|
    debug "Scaling #{res.logical_resource_id}"
    Thread.new do
      grp = res.group
      debug "Current capacity: #{grp.desired_capacity}, setting to #{scale}"
      grp.set_desired_capacity(desired_capacity: scale)
      last_state = nil
      until stable_scale(grp, scale)
        log "Current scaling status: #{last_state = grpstatedesc(grp)}" unless last_state.eql? grpstatedesc(grp)
        sleep 3
        grp.reload
      end
      log "Done updating - current scale: #{grpstatedesc(grp)}"
    end
  end.each(&:join)
end

#grpstate(grp) ⇒ Object 



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# File 'lib/cloud_formation_tool/cli/scale.rb', line 11

def grpstate(grp)
  grp.instances.collect { |i| i.lifecycle_state }.reduce({}) { |m,s| m[s] = (m[s] || 0) + 1; m }
end

#grpstatedesc(grp) ⇒ Object 



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# File 'lib/cloud_formation_tool/cli/scale.rb', line 15

def grpstatedesc(grp)
  grpstate(grp).collect{|s,c|"#{c} #{s}"}.join(", ")
end

#stable_scale(grp, scale) ⇒ Object 



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# File 'lib/cloud_formation_tool/cli/scale.rb', line 19

def stable_scale(grp, scale)
  state = grpstate(grp)
  state["InService"].eql? scale.to_i and state.delete_if{|k|k.eql? "InService"}.empty?
end