Class: Cumulus::AutoScaling::PolicyConfig

Inherits:
Object
  • Object
show all
Defined in:
lib/autoscaling/models/PolicyConfig.rb

Overview

Public: A class that encapsulates data about the way a scaling policy is configured.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(json = nil) ⇒ PolicyConfig

Public: Constructor

json - a hash representing the JSON configuration for this scaling policy



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 23

def initialize(json = nil)
  @@cloudwatch ||= Aws::CloudWatch::Client.new(Configuration.instance.client)

  if !json.nil?
    @name = json["name"]
    @adjustment_type = json["adjustment-type"]
    @adjustment = json["adjustment"]
    @cooldown = json["cooldown"]
    @min_adjustment = json["min-adjustment-step"]
    @alarms = {}
    if !json["alarms"].nil?
      @alarms = Hash[json["alarms"].map { |alarm| [alarm["name"], AlarmConfig.new(alarm)] }]
    end
  end
end

Instance Attribute Details

#adjustment ⇒ Object (readonly)

Returns the value of attribute adjustment.



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 13

def adjustment
  @adjustment
end

#adjustment_type ⇒ Object (readonly)

Returns the value of attribute adjustment_type.



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 14

def adjustment_type
  @adjustment_type
end

#alarms ⇒ Object (readonly)

Returns the value of attribute alarms.



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 15

def alarms
  @alarms
end

#cooldown ⇒ Object (readonly)

Returns the value of attribute cooldown.



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 16

def cooldown
  @cooldown
end

#min_adjustment ⇒ Object (readonly)

Returns the value of attribute min_adjustment.



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 17

def min_adjustment
  @min_adjustment
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 18

def name
  @name
end

Instance Method Details

#diff(aws) ⇒ Object

Public: Produce the differences between this local configuration and the configuration in AWS

aws - the scaling policy in AWS



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 57

def diff(aws)
  diffs = []

  if @adjustment_type != aws.adjustment_type
    diffs << PolicyDiff.new(PolicyChange::ADJUSTMENT_TYPE, aws, self)
  end
  if @adjustment != aws.scaling_adjustment
    diffs << PolicyDiff.new(PolicyChange::ADJUSTMENT, aws, self)
  end
  if @cooldown != aws.cooldown
    diffs << PolicyDiff.new(PolicyChange::COOLDOWN, aws, self)
  end
  if @min_adjustment != aws.min_adjustment_step
    diffs << PolicyDiff.new(PolicyChange::MIN_ADJUSTMENT, aws, self)
  end

  # get all cloudwatch alarms that trigger this policy as their action
  aws_alarms = @@cloudwatch.describe_alarms({
    action_prefix: aws.policy_arn
  }).metric_alarms
  alarm_diffs = diff_alarms(aws_alarms, aws.policy_arn)
  if !alarm_diffs.empty?
    diffs << PolicyDiff.alarms(alarm_diffs, self, aws.policy_arn)
  end

  diffs
end

#hash ⇒ Object

Public: Get the configuration as a hash

Returns the hash



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 42

def hash
  {
    "name" => @name,
    "adjustment-type" => @adjustment_type,
    "adjustment" => @adjustment,
    "cooldown" => @cooldown,
    "min-adjustment-step" => @min_adjustment,
    "alarms" => @alarms.map { |a| a.hash }
  }.reject { |k, v| v.nil? }
end

#populate(resource) ⇒ Object

Public: Populate the PolicyConfig from an existing AWS scaling policy

resource - the aws resource to populate from



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# File 'lib/autoscaling/models/PolicyConfig.rb', line 88

def populate(resource)
  @name = resource.policy_name
  @adjustment_type = resource.adjustment_type
  @adjustment = resource.scaling_adjustment
  @cooldown = resource.cooldown
  @min_adjustment = resource.min_adjustment_step

  alarms = @@cloudwatch.describe_alarms({
    action_prefix: resource.policy_arn
  }).metric_alarms
  @alarms = alarms.map do |alarm|
    config = AlarmConfig.new()
    config.populate(resource.policy_arn, alarm)
    config
  end
end